I'm going nuts with this, because I have two other computers running Qt Creator perfectly, and this one just refuses to : I don't know what to do; I'm not a veteran programmer and I don't even really know what it is I'm doing.
Help please!! The several different MSVC compilers are fine: You can actually switch the compiler to produce code for all those architectures by using the setup scripts that come with the compiler. Since it is rather hard to find out which of those are identical in any programmatic way we just leave in the duplicates that the setup scripts report. The debugger log looks ok to me.
Are you sure your application did not just quit without doing anything? Do we have an update on this? I'm running Creator 2. Someone on stackoverflow suggested cloning the auto-detected compilers, and manually pointing the debuggers to them:. That most certainly does work. Contrary to the claims made on stackoverflow both the 64bit and the 32bit debugger should work fine on a 64bit windows. Qt Forum. This topic has been deleted. Only users with topic management privileges can see it.
Details: There is no CDB binary available for binaries in format 'xwindows-msvcpebit" When i found that cdb. Can somebody kindly explain in detail what these mean and what values are expected here. Reply Quote 0 1 Reply Last reply. The debugger was moved around in the new windows SDK, so Creator currently fails to detect it. Active 4 months ago. Viewed 83k times.
Details: There is no CDB binary available for binaries in format 'xwindows-msvcpebit" When i found that cdb. Improve this question. Martin Martin 2, 5 5 gold badges 36 36 silver badges 63 63 bronze badges. Hey there Martin, Did you end up solving this issue as I am having the exact same thing? I saw the answer regarding the new. Net debugging tools location and that QT 2. So, any other ideas? Net 4. Hi Adi, i could not solve the issue on Qt Creator, however i downloaded the Qt visual studio plugin qt.
Add a comment. Active Oldest Votes. Do the following: Tools Options Improve this answer. Donald Duck 6, 17 17 gold badges 58 58 silver badges 78 78 bronze badges. Colby Boles Colby Boles 5 5 silver badges 3 3 bronze badges. Thank You Colby, that worked! This appears to be your first answer. Welcome to stackoverflow! Totally solved my problem too! This is perfect. I have the 7. I am on a 64 bit windows 7 sp1 and qt creator5. Ok, I did as you said, I had to restart QtCreator for the settings to take place.
On Windows R2 cdb. Took me some time to figure out this with Qt Creator 2. Darien Pardinas Darien Pardinas 4, 1 1 gold badge 30 30 silver badges 40 40 bronze badges. But the Windows 10 SDK worked with the same instructions. If so, the solution for me was within Qt Creator : Tools Options Samuel Harmer Samuel Harmer 3, 4 4 gold badges 25 25 silver badges 62 62 bronze badges.
The "build" button is greyed out on mine as are all other options under my auto-detected qmake. Its the solution!!! In windows 8 64 bits!! Donald Duck Donald Duck 6, 17 17 gold badges 58 58 silver badges 78 78 bronze badges.
I'm pretty much flying blind here because I have such scarce knowledge of basically anything outside of the actual programming part. I'm going nuts with this, because I have two other computers running Qt Creator perfectly, and this one just refuses to : I don't know what to do; I'm not a veteran programmer and I don't even really know what it is I'm doing. Help please!! The several different MSVC compilers are fine: You can actually switch the compiler to produce code for all those architectures by using the setup scripts that come with the compiler.
Since it is rather hard to find out which of those are identical in any programmatic way we just leave in the duplicates that the setup scripts report. The debugger log looks ok to me. Are you sure your application did not just quit without doing anything?
Do we have an update on this? I'm running Creator 2. Someone on stackoverflow suggested cloning the auto-detected compilers, and manually pointing the debuggers to them:. That most certainly does work. Contrary to the claims made on stackoverflow both the 64bit and the 32bit debugger should work fine on a 64bit windows.
Qt Forum. This topic has been deleted. Only users with topic management privileges can see it. Details: There is no CDB binary available for binaries in format 'xwindows-msvcpebit" When i found that cdb. Can somebody kindly explain in detail what these mean and what values are expected here. Reply Quote 0 1 Reply Last reply. But when I try and run the application. I get the following message:. Running the above script helped me. You can see the failing build and passing build.
For example, the following condition. The large number of questions on StackOverflow regarding whether this method or that method is faster, belie the fact that, in the vast majority of cases, code spends most of its time sitting around waiting for users to do something. The difference may well be only a couple of seconds and even then, only when processing huge numbers of elements.
Get your code working first. Then get it working fast and only if you find an actual performance issue. The main lesson to take away from that is: use const references in read only loops as it avoids the creation of temporary instances. It also make the purpose of the loop more explicit, regardless of the looping method you use. You are indexing instead of really iterating. That being said. The timing difference between those two pieces of code will be negligible if existent at all. Write whichever you find more clear and understandable.
And now it works for me. Hopefully I mentioned everything from the very beginning, the aim is to write a very clear tutorial. Finally I am starting to be happy. Listing them manually helped, at first I wrote them somehow wrongly. How can I fix it? You can use QTextCodec to convert the bytearray to a string:. The only unicode encoding in which ascii letters are encoded in this way, are UTF or UCS-2 which is a restricted version of UTF , so in your case the mib is needed assuming your local endianess is the same as the input endianess.
It behaves similar to std::getline and is maybe faster as QTextStream::readLine , because it reuses the string:. Here is my. If number 2 does not apply, make sure that the function you are trying to trigger is declared as a slot in the header. Finally if none of these are your issue, it would be helpful to know if you are getting any run-time connect errors.
I have a Qt application, and when I run this application, there is a console opening behind it. In development it is nice because i see debug outputs on the console, but when I want to give this executable to the customer there should be no console window. It sounds like your linker configuration is incorrect. Qt5 has a new JSon parser and I want to use it. That or I could be reading it wrong. An example on how to use that would be great.
How about QTime? Depending on your platform it should have 1 millisecond accuracy. Code would look something like this:. It was introduced with Qt 4. QElapsedTimer can also be used to calculate the time in nanoseconds. Code example:. What would be the best way of selecting an item in a QT combo box out of a predefined list of enum based unique values.
In the past I have become accustomed to. You lookup the value of the data with findData and then use setCurrentIndex. If you know the text in the combo box that you want to select, just use the setCurrentText method to select that item. The setter setCurrentText simply calls setEditText if the combo box is editable.
Otherwise, if there is a matching text in the list, currentIndex is set to the corresponding index. So as long as the combo box is not editable, the text specified in the function call will be selected in the combo box. I use a QLabel to display the content of a bigger, dynamically changing QPixmap to the user.
The screen size is not always as big as the QPixmap. Setting hasScaledContents on the QLabel allows growing, but breaks the aspect ratio thingy…. In order to change the label size you can select an appropriate size policy for the label like expanding or minimum expanding. Hope that helps! I am trying to set the background color for a double spin box, and I am not sure what function I should use.
To make sure your background color will be correct, I would suggest to use the Qt Style Sheet. Here is what I did to change the background color of a QComboBox :. A more general solution would be something like this:. Alternatively, you could look into the descriptions of the various palette roles and figure out the one you want, then apply it to the widget containing the others you want changed.
The palette changes should propagate to the children widgets. Actually, if you look at the Qt docs for QPalette in the case of a QComboBox the background role is probably not what you want. What you want is:.
So here is the code I am using to set the background color of a combo box I am using to match the color of the widget it is on:. I am new to Android Studio and I am having problems while using the emulator. When I try to run it keeps crashing saying:.
I have searched a lot and cannot find an answer. Any help will be much appreciated. Can anyone give me a solution? Screenshot of error. This seems to be an issue relating to the recent update. Make sure you have installed it and then try other answers if required. The best is QSpinBox. And for a double value use QDoubleSpinBox.
I Have Installed Qt Creator5 with latest binaries. Configure a compiler in the kit options. For me on Windows 7 this was solved by clicking on the arrow icon next to the computer icon on the bottom left of the Qt Creator screen above green arrows and then double clicked a compiler on the list and rebuild the project. Qt documentation states that signals and slots can be direct , queued and auto. I have tried the following code:.
This code would most likely work though I have not tested it and I think it does what you want it to do :. An event loop is needed in thread2 lanched by exec to receive the signal. Unfortunately the problem stems from a lack of updates to documentation. Prior to Qt 4. The key to getting slots to execute in a worker thread is to use the moveToThread method as Aiua pointed out.
I am trying to deploy release to public a simple qt application I made recently, but got stuck at static linking qt libs. I followed the guide on qt docs to re-build qt and my app statically. Or even better, has successfully resolved it?
I wrote a guide to static linking. You may also want to check out the BitRock installer, which is free for open source projects. In short, it turns out to be a little more complex if you are using anything Qt thinks of as a plugin, such as support for most image types JPEG, GIF or databases.
PRO file:. You need to change these settings back order to get it to compile with dynamic linking again like when debugging or adding features , though this can be easily automated. There are also considerations when building the Qt libraries for use with static linking, though the Qt instructions will at least get you started.
With Qt 5. There are following orthogonal settings that you pass to configure when building Qt:. Additionally, follow the instructions from this blog post. Some flag or option or something? Context: the calibre eLibrary manager which is written in Python and Qt. It currently displays as on the left.
The question here is the same as mine but the solution there is not working for me. I am using QtCreator 2. When i found that cdb. Can somebody kindly explain in detail what these mean and what values are expected here. Has anybody successfully debugged any applicaiton using Qt Creator. I was having the same problems too, and finally figured out how to solve this. Styne gave me a hint. Do the following:. I should further mention that if you are running a bit version of Windows and a bit version of Qt Creator like I am, you need to make sure that you are pointing to the bit versions of cdb of which there are x86 and x64 target versions.
So for the bit target builds I run this:. The tricky part is that it is somewhat difficult to get Microsoft to install the bit version of the debugging tools on your bit machine. A co-worker tried to do so recently and said that he needed to install the Windows 8 tools in order to have the option to do that - the Windows 7 versions would not let you.
I want to ask about resources for learning Qt for beginners. What resources do you recommend for that? All of them are really good. Try to do the examples by your own. You will be quite comfortable with the framework after watching these videos. After going through few chapters you will be very accustomed to the Framework. I would also like to recommend the On-line Reference Documentation which will give a great depth in to QT when going forward.
In order to automatically ensure that all moc cpp files are generated, you can get qmake to automatically generate a. If you had any signals or slots, it would do a few things for those as well. I just reinstalled QtCreator, created new project Qt Application an got this after compilation:. How do you set application icon for application made using Qt? Is there some easy way? For Qt 5 , this process is automated by qmake.
Just add the following to the project file:. For Qt 4 , you need to do it manually. On Windows, you need to create a. The RC file should look like this:. For further reading, see Setting the Application Icon. I want to do the following: every time a message is written, I want the receiving QPeer to emit its signal dataReceived QByteArray exactly once, that QByteArray containing the entire message.
I use the signal QTcpSocket::readyRead for asynchronous reading from the socket. So what should I do? For example: what to do if readyRead is emitted and I can read the header of a message, but not the amount of bytes specified? Or what if a header has only been received partially? I worked on a project that does what you expect, see here the solution that I developed to our problems, simplified to be easier to understand:.
Note: Do not use this method to transfer large files because with this method the entire contents of the message is put inside the memory before sent and this causes a high memory usage. Take care. As you said, you need to wait that your header is entirely sent, before reading it, and then read the good number of bytes and emit a signal for data availability.
I struggled finding a how-to which provides a stable solution for using Qt with Visual Studio , so after collecting all the bits of information and some trial and error, I would like to write my solution into a guide. It seems that using binaries built for Visual Studio might work in some special cases, but I found them not to work.
In my case they compiled OK, but they produce runtime errors, like this:. Update : I found a blog post analysing why does it work for some people, while it does not for others. In one word, it depends on whether you have Visual Studio installed on the same machine, or not.
Update the latest Qt 4. Now that we have the sources, we need to build the binaries. This is a special command prompt which has all the variables set for building with Visual Studio tools. Once within the command prompt, navigate to your extracted Qt folder using old-school DOS way, which means you have to change drive letter by E: , enter directories by cd Qt and list dir contents by dir.
You can use the tab key for helping you with the directory names. When you have arrived at the correct directory, a dir command should return something like this. Just copy and paste it into the command line. Look in the Qt reference manual for what flag to use or not to use. Once configure. It will take about minutes with the above flags.
To start it, just type:. Basically, we are done. Within Path Editor. Here you go, after a logoff-logon or a restart, all the Qt demo applications should start correctly I recommend have a look at bin. Now you can download and install the Visual Studio Add-in qt-vs-addin There is a page at the official wiki at the Qt website called Qt 4. Qt V4. I press a button onClick signal event , which runs code that changes an image QLabel on the display, waits for input, and then proceeds by changing a new image different QLabel.
How can I force the QLabel pixmap to refresh. Below is all the code I have tried in my onClick signal event handler. Appreciate any help, advice, and or sample code. I was using sleep to emulate a brief amount of time the computer was waiting for something to happen. I managed to get the above to work. I walked through the debugger and noticed the display would refresh before the sleep function. I was going to start a process waiting for the USB event. I would wait until the process releases the wait condition for my routine to continue.
But if anyone thinks this is a bad idea, please, speak out. I really do appreciate your feedback PiedPiper and Hostile Fork. You need to rethink the logic of your program to use events the way they were intended. All the update and repaint calls in your code are unnecessary if you return to the event loop. I know I can disable the buttons with setEnabled and isEnabled but I do not know how to disable them. If I understood correctly you connected various QPushButtons to the same slot.
Inside of the slot deneme you want to know which of the buttons was clicked. You can do something like:. Why is setEnabled not working then? The reference. If the connecting a event handler on the click event of the button maybe you should look at the QT documentation: Signal and slots. You mean Button has to be disabled right after clicking on it? I guess in that case you probably want to do something like this:.
But when I run the code it is not giving the error message specified in handleError even though the file I mentioned in the path does not exist. I would use the QFileInfo -class docs - this is exactly what it is made for:. QFileInfo can also be used to obtain information about a Qt resource. Also consider: Do you only want to check if the path exists exists or do you want to also make sure that this is a file and not a directory isFile?
If you want it to return true only if the file exists and false if the path exists but is a folder, you can combine it with QDir::exists :. What is the most common one? Why would you choose one over the other? As you seem to primarily target Linux, then the choice mostly depends on the programming language you want to use. Choose what works best for you. Others are embedding web content into their application using for instance Awesomium or Berkelium. The project worked out well but there were quite a few glitches getting it to compile and run properly in other platforms - sometimes some events were fired up differently and such.
Also GDI in wxWidgets was pretty slow. Next I used GTK for a different project in python. For this I used the python bindings and everything worked out more or less smoothly. Finally, I did a very simple QT project now that Nokia has acquired it and was brilliant. The best of the three. Regarding the library I also liked a lot the documentation and the APIs provided. The license is pretty good and the SDK and documentation really nice.
It is much more than a simple GUI. It provides all you mention — database, XML, networking and threading, and more. It also provides things such as containers and iterators, and counterparts to a number of boost libraries. The thing that impressed me most when starting to use Qt was the extremely extensive documentation.
You get a program called Qt Assistant, which provides fully indexed and searchable API documentation on your desktop, as well as numerous code examples and tutorials. I found it made a big difference in searching the web each time for API info. Very quick access when you need to remember a method signature.
Of course, KDE is very popular as well. I believe Qt will also soon become the default toolkit for Symbian OS. I have not used Qt Creator, but I have heard many good things about it. It also has fake vim emulation which is always nice if you like that kind of thing! Qt uses qmake for build configuration.
I found this much nicer than having to write your own makefiles. I do not know what GTK uses for building. A couple of things I found a bit offputting with Qt at first was its big uses of preprocessor macros. All in all, though, I would recommend Qt, particularly if you are learning. It has really amazing documentation and a nice IDE, and busy forums. Trying to compile a project on QtCreator. It happens when I try to create an instance of an user defined class, Layer.
That class consists of a header, layer. It was tested and works in another programs. On my project, it is included in qtwidget. For example:. In my opinion, the error message that Qt Creator displays is quite misleading until you understand it, but does not prevent splitting the template class into a header and implementation file.
If you think about the message:. Putting all declarations of the. I still had a leftover problem, though: duplicated symbols which was the reason I split it. This time, declaring a variable as external in the. I recently tried to use Qt Creator 1. In my search for a solution, I came across the thread qmake and compiler flags?
It boils down to reading the manual. Look for. You might want to read the qmake documentation for that:. These extra features often provide support for custom tools that are used during the build process. To add a feature to the build process, append the feature name the stem of the feature filename to the CONFIG variable. You can add your own features. It has a text message and OK, Cancel buttons. I am showing the dialog using exec to make it blocking.
I tried connecting the buttons to setResult and then, return the result value when clicked, but. The user will instantiate the class and call showYourself which is expected to return the value and also close and delete the dialog. You need to add this code before showing the dialog this assume it is in a dialog method :. Note: Only after you have clicked the Ok button or Cancel button in a standard QMessageBox, setResult function is triggered and the status is changed.
I think only after your dialog gets closed, you will have the result available in result function. So I guess it will be solved, after you have made the changes specified in Case 1. You should delete the debug folder of your application and run it again to correct this problem. Unlike the name suggest, Rebuild Project will not wipe out everything and build from scratch. This is because, by default, qmake only runs when you do significant changes to your solution like adding new source files or modify the.
As a fall back, to brute force Qt to build everything from scratch, delete the Debug or Release folder. I have a Qt dialog application. Now I dont want that dialog to be resizeable. I am not sure how to achieve this. I tried a bunch of things but still when the dialog launches this dialog can be resized.
You can do. Recheck other parts of your code. Normally in Java I would just have a class called DatabaseControl with a void method that would execute whatever I wanted. In the same header file I have this below my class declaration. Possible Duplicate: QString to char conversion.
Then call data on the QByteArray to get a pointer to the data stored in the byte array. See the documentation:. Note that it is necessary to store the bytearray before you call data on it, a call like the following. Of course, I discovered there is another way from this previous SO answer :. You could use QFile rather than std::fstream.
This is because toLatin1 returns an object of QByteArray. As it is not actually bound to a variable it is a temporary that is destroyed at the end of the expression. I feel like I am close, but I may have a fundamental misunderstanding of some parts of this process. However, I seem to be getting stuck with some seemingly obvious configure options for Qt: -platform and -xplatform.
Qt documentation says that -platform should be the host machine architecture where you are compiling and -xplatform should be the target platform for which you wish to deploy. When cross-compiling something like Qt for Windows from a Linux host, should the native compiler ever be invoked? Spec files for GCC are still sort of a mystery to me, so I am wondering if some background here will help me. In general, beyond specifying a cross compiler in my qmake.
Just use M cross environment MXE. It takes the pain out of the whole process:. Now, what you need to do is:. What is the purpose of this preprocessor macro? Among other things, meta-object code is required for the signals and slots mechanism, the run-time type information, and the dynamic property system. But it will be quietly ignored in any other classes - it just adds to the build time.
I am trying to obtain values from a json object. Here is what the json object looks like that I am trying to get data from:. How can I create three arrays that contain properties[x]. ID , properties[x]. PropertyName , and properties[x]. The Qt documentation for QThread says to create a class from QThread, and to implement the run method. I hit a snag last week managed to get through it by working around where I created my objects and found the following blog post.
This is coming from a Qt developer so at first glance I was interested and upon further reflection, agree with him. Following OO principles, you really only want to subclass a class to further enhance that class… not to just use the classes methods directly… thats why you instantiate….
Since this question gets so much attention, here is a copy and paste of the 4. I still believe that it is worthwhile to point out that they include an extra Worker::workerThread member that is unnecessary and is never used in their example. Remove that piece and it is a proper example of how to do threading in Qt.
About the only thing I can think of to add is to further state that QObject s have an affinity with a single thread. This is usually the thread that creates the QObject. This saves having to subclass QThread and creating your objects in the run method, thus keeping your stuff nicely encapsulated. That blog post does include a link to an example. It is pretty short but it shows the basic idea. You may have to introduce synchronization if you have to call methods on your object outside of that mechanism.
I know Qt has some other nice threading facilities beyond threads that are probably worth getting familiar with but I have yet to do so :. The comment posted on August 6, gives a nice idea how to deal with this issue. The basic idea is the same: I create a QThread instance that lives in my main thread, a worker class instance that lives in the new thread I created, and then I connect all the signals.
The ChildProcesses class is a child process manager that starts new child processes with spawn calls, keeps the list of the processes currently running and so on. However, it needs to keep track of the children states, which means using waitpid call on Linux or WaitForMultipleObjects on Windows. I used to call these in non-blocking mode using a timer, but now I want more prompt reaction, which means blocking mode. Here how it works.
When all this stuff is started, the ChildProcess::start method is called see above. It creates a new QThread and a new ChildrenWatcher, which is then moved to the new thread. Then starts the main fun. I connect QThread::started to the ChildrenWatcher::watch method so it is started as soon as the thread is ready. This is needed so my thread stops when the ChildProcesses manager is no longer needed. The stop method looks like this:. So what happens here is that I set the stopped flag when I need to finish, and then the next time isStopped is called it returns false and the thread ends.
So what happens when the watch loop ends? It calls deleteLater so the object self-destructs as soon as control is returned to the thread event loop which happens just right after the deleteLater call when watch returns. Going back to ChildProcesses::start , you can see that there is a connection from the destroyed signal of the watcher to the quit slot of the thread. This means that the thread automatically finishes when the watcher is done.
I could define a finished signal in the worker, and then connect it to its own deleteLater , but that would only mean one connection more. Only as part of Boost. Filesystem library. Here is an example:. Both options are explained in the Qt Tutorial.
You can also register types, e. In most cases this is not recommended, except if you need some certain extern class or some data that you cannot display otherwise in your QML Interface. The QVariant basically contains your data and a desription of the data type, so that the QML knows how to handle it properly.
I have used the qmlRegisterType before, but it is a very inconvenient Solution for simple data types. You can formally put an object of class type into a switch statement, but that simply means that the compiler will look for a user-defined conversion to convert it to integral or enum type. To do that, first declare an enum with the strings to be used in switch cases as enumerator name in your class declaration. Then in the. You can also do other transformations needed to the string.
Does anyone know how one would be able to set a background color for the whole window of a Qt application? Basically, if I want a black background how would I make it seamless without any borders of the original background? EDIT : according to comment, here is a solution without using ui files and loading an external style sheet.
You should use one of the iterator methods described in the documentation but you should avoid using. You could also use a wrapper to get QMap::iterator as the auto type:. For people interested in optimizations, I have tried several approaches, did some micro benchmarks, and I can conclude that STL style approach is significantly faster. Edit July : I ran this code again on my new laptop Qt 5.
Is there any easy way to get the following work? I mean is there any helper class in Qt which prepares the string for qDebug? The nospace is to avoid printing out spaces after every argument which is default for qDebug.
According to Qt Core 5. We have large project that used. Recently i decided to deprecate CLR dependency and move to Qt. Is there any chance for me to use Qt and qt addin in our projects?
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October 25, am. Load More Comments. Find Scams. You specify a build and run kit that identifies the device to debug the application on. While this mode does not strictly require a project to be opened in Qt Creator, opening it makes setting breakpoints and stepping through the code easier. You can attach the debugger to applications that are already running or instruct the debugger to attach to an application when it starts. You can specify breakpoints before or after attaching the debugger to the application.
The Core mode is used to inspect core files crash dumps that are generated from crashed processes on Linux and Unix systems if the system is set up to allow this. To enable the dumping of core files on a Unix system, enter the following command in the shell from which the application will be launched:.
Also in this mode, using a properly configured project containing the sources of the crashed program is not strictly necessary, but helpful. The post-mortem mode is available only on Windows, if you have installed the debugging tools for Windows. The Qt Creator installation program asks you whether you want to register Qt Creator as a post-mortem debugger.
You can launch the debugger in the post-mortem mode if an application crashes on Windows. Click the Debug in Qt Creator button in the error message that is displayed by the Windows operating system. In general, the remote debugging setup consist of a probe running on the remote machine and a counterpart running on the host side.
The probe is either integrated into the running process e. While this setup might look daunting, it is mostly invisible to the user of Qt Creator. Special use cases, such as attaching to a running process on the target, might still require manual setup. The GDB server process is started on the remote machines by passing a port number and the executable:. The process is started with special command line options that switch it into server mode. Documentation contributions included herein are the copyrights of their respective owners.
All other trademarks are property of their respective owners. Launching the Debugger To start an application from an open project under the control of a debugger, select the Start Debugging of Startup Project button or press F5. The debugger then takes over and starts the program with suitable parameters. Launching the Debugger in Different Modes The debugger plugin can run the native debuggers in various operating modes depending on where and how the debugged process is started and run.
Start External to start and debug processes without a proper Qt Creator project setup, either locally or on a remote machine. Attach to debug processes already started and running outside Qt Creator, either locally or on a remote machine. Core to debug crashed processes on Unix. Post-mortem to debug crashed processes on Windows. Launching in Start External Mode You can debug any executable already present on your local or on a remote machine without using a project.
In the Kit field, select the build and run kit to use for building the project. In the Local executable field, specify the path to the application executable on the local machine. In the Command line arguments field, specify command line arguments to be passed to the executable. In the Working directory field, specify the working directory.
I should further mention that if you are running a bit version of Windows and a bit version of Qt Creator like I am, you need to make sure that you are pointing to the bit versions of cdb of which there are x86 and x64 target versions. So for the bit target builds I run this:. The tricky part is that it is somewhat difficult to get Microsoft to install the bit version of the debugging tools on your bit machine. A co-worker tried to do so recently and said that he needed to install the Windows 8 tools in order to have the option to do that — the Windows 7 versions would not let you.
It sounds like what I encountered on OSX with the gdb. If so, the solution for me was within Qt Creator :. Questions: I wrote a simple program to play around with in-place creation of objects inside standard library containers. Questions: How can I make this simple class movable? Add menu. Took me some time to figure out this with Qt Creator 2. Its the solution!!! Data breakpoints will be disabled when the debugged program exits, as it is unlikely that the used addresses will stay the same at the next program launch.
If you really want a data breakpoint to be active again, re-enable it manually. When the program being debugged is interrupted, Qt Creator displays the nested function calls leading to the current position as a call stack trace.
This stack trace is built up from call stack frames, each representing a particular function. For each function, Qt Creator tries to retrieve the file name and line number of the corresponding source file. This data is shown in the Stack view. Since the call stack leading to the current position may originate or go through code for which no debug information is available, not all stack frames have corresponding source locations.
Stack frames without corresponding source locations are grayed out in the Stack view. If you click a frame with a known source location, the text editor jumps to the corresponding location and updates the Locals and Expressions views, making it seem like the program was interrupted before entering the function.
The Locals view consists of the Locals pane and the Return Value pane hidden when empty. Whenever a program stops under the control of the debugger, it retrieves information about the topmost stack frame and displays it in the Locals view. The Locals pane shows information about parameters of the function in that frame as well as the local variables.
To compute values of arithmetic expressions or function calls, use expression evaluators in the Expressions view. To insert a new expression evaluator, either double-click on an empty part of the Expressions or Locals view, or select Add New Expression Evaluator from the context menu, or drag and drop an expression from the code editor. Note: Expression evaluators are powerful, but slow down debugger operation significantly.
It is advisable to not use them excessively, and to remove unneeded expression evaluators as soon as possible. Expression evaluators are re-evaluated whenever the current frame changes. Note that functions used in the expressions are called each time, even if they have side-effects. Functions can be called only if they are actually compiled into the debugged executable or a library used by the executable.
Most notably, inlined functions such as most operator implementations of standard containers are typically not available. A sub-expression of form foo[a.. Compound variables of struct or class type are displayed as expandable in the view.
Expand entries to show all members. Together with the display of value and type, you can examine and traverse the low-level layout of object data. The Locals and Expressions views also provide access to the most powerful feature of the debugger: comprehensive display of data belonging to Qt's basic objects. For example, in case of QObject , instead of displaying a pointer to some private data structure, you see a list of children, signals and slots.
Similarly, instead of displaying many pointers and integers, Qt Creator's debugger displays the contents of a QHash or QMap in an orderly manner. Also, the debugger displays access data for QFileInfo and provides access to the real contents of QVariant. Right-click in the Locals or the Expressions view to open a context menu that provides additional options for viewing data. The available options depend on the type of the current items, and are provided by the Debugging Helpers.
Typically, string-like data, such as QByteArray and std::string , offer a selection of encodings, as well as the possibility to use a full editor window. Map-like data, such as QMap , QHash , and std::map , offer a compact option using the name column for keys, resulting in a concise display of containers with short keys, such as numbers or short strings.
You can use the Locals and Expressions view to change the contents of variables of simple data types, for example, int , float , QString and std::string when the program is interrupted. To do so, click the Value column, modify the value with the inplace editor, and press Enter or Return. To change the complete contents of QVector or std::vector values, type all values separated by commas into the Value column of the main entry.
You can enable tooltips in the main editor displaying this information. For more information, see See the value of variables in tooltips while debugging. In some cases, it is convenient to directly interact with the command line of the native debugger. In Qt Creator, you can use the left pane of the Debugger Log view for that purpose.
Alternatively, you can use the line edit at the bottom of the view. Output is displayed in the right pane of the Debugger Log view. Note: Usually, you do not need this feature, because Qt Creator provides you with better ways to handle the task. For example, instead of using the GDB print command from the command line, you can evaluate an expression in the Expressions view.
You can use the Qt Creator debugger interface from the command line. To attach it to a running process, specify the process ID as a parameter for the -debug option. To examine a core file, specify the file name. Qt Creator executes all the necessary steps, such as searching for the binary that belongs to a core file.
To connect to a debug server, specify the server location and port number. In macOS, external libraries are usually built into so-called Frameworks, which may contain both release and debug versions of the library. When you run applications on the macOS desktop, the release version of Frameworks is used by default.
To step into Frameworks, select the Use debug versions of Frameworks option in the project run settings. If a multi-threaded program is interrupted, the Threads view or the combobox named Threads in the debugger status bar can be used to switch from one thread to another. The Stack view adjusts itself accordingly.
The Modules view displays information that the debugger plugin has about modules included in the application that is being debugged. A module is a dynamic link library. In addition, the view displays symbols within the modules and indicates where each module was loaded. When using CDB as debug backend, you can specify that the debugger should break when application modules are loaded or unloaded.
The Source Files view lists all the source files included in the project. If you cannot step into an instruction, you can check whether the source file is actually part of the project, or whether it was compiled elsewhere. The view shows the path to each file in the file system. Right-click the view to open a context menu that contains menu items for reloading data and opening files.
The Disassembler view is useful for low-level commands for checking single instructions, such as Step Into and Step Over. By default, the Disassembler view is hidden. Alternatively, click the Operate by Instruction tool button on the debugger tool bar. The Registers view displays the current state of the CPU registers. Depending on the CPU type, there will be different registers available.
The values of registers that recently have changed are highlighted in red and empty register values as well as leading zeroes are grayed out. In addition it is possible to edit the content of registers while the program is stopped. This applies to both General-purpose and Special-purpose registers.
Registers can be edited in the standard condensed view or in their particular parts if the register is displayed expanded. Documentation contributions included herein are the copyrights of their respective owners. All other trademarks are property of their respective owners. Interacting with the Debugger You can use the Qt Creator Debug mode to inspect the state of your application while debugging. You can interact with the debugger in several ways, including the following: Go through a program line-by-line or instruction-by-instruction.
Interrupt running programs. Set breakpoints. Examine the contents of the call stack. Examine and modify contents of local and global variables. Examine and modify registers and memory contents of the debugged program. Examine the list of loaded shared libraries. Disassemble sections of code.
For licensing terms. For further. Please review the following. Cdb engine version 2: Run the CDB process on pipes and parse its output. It serves to:. Debugger commands can be posted by calling:. Startup sequence:. On process startup,. The debuggee. EngineSetupOk is. Shutdown mostly uses notifyEngineSpontaneousShutdown as cdb just quits. CdbEngine::CommandHandler handler;. CdbEngine::CdbEngine :. QDir::toNativeSeparators expand it.
We don't handle anything else here in CDB. QDir::toNativeSeparators extensionFi. BreakpointParameters bp BreakpointAtMain ;. BreakpointManager::claimBreakpointsForEngine this ;. In that case,. No can do, currently. AdditionalQmlStackCapability ;. BreakpointParameters bp BreakpointByFunction ;. StringInputStream str cmd ;. StringInputStream str fullCmd ;.
LogWarning ;. DebuggerCommand cmd " theDumper. StringInputStream str arguments ;. Quote as safeguard against shadowed. DebuggerCommand cmd " locals " , ExtensionCommand ;. When address and function are. So, to ensure the agent's. StringInputStream str ba ;. Check for the. DebuggerCommand cmd " memory " , ExtensionCommand ;. StringInputStream str args ;. All other trademarks are property of their respective owners. Launching the Debugger To start an application from an open project under the control of a debugger, select the Start Debugging of Startup Project button or press F5.
The debugger then takes over and starts the program with suitable parameters. Launching the Debugger in Different Modes The debugger plugin can run the native debuggers in various operating modes depending on where and how the debugged process is started and run.
Start External to start and debug processes without a proper Qt Creator project setup, either locally or on a remote machine. Attach to debug processes already started and running outside Qt Creator, either locally or on a remote machine.
Core to debug crashed processes on Unix. Post-mortem to debug crashed processes on Windows. Launching in Start External Mode You can debug any executable already present on your local or on a remote machine without using a project. In the Kit field, select the build and run kit to use for building the project.
In the Local executable field, specify the path to the application executable on the local machine. In the Command line arguments field, specify command line arguments to be passed to the executable. In the Working directory field, specify the working directory. It defaults to the directory of the build result. Select the Run in terminal check box for console applications.
Select the Break at "main" check box to stop the debugger at the main function. In the Override SysRoot field, specify the path to the sysroot to use instead of the default sysroot. In the Debug information field, specify the location for storing debug information.
You cannot use an empty path. In the Recent field, you can select a recent configuration to use. Launching in Attach Mode You can attach the debugger to applications that are already running or instruct the debugger to attach to an application when it starts.
In the Filter field, enter a string to filter processes by their process ID or name. Select a process in the list, and then select Attach to Process to start debugging. To refresh the list of running processes, select Update List. To terminate the selected process, select Kill Process. In the Executable field, specify the path to the application executable. Select the Reopen dialog when application finishes check box to return to this dialog when the application is closed.
Select the Continue on attach check box to instruct the debugger to keep the application running after attaching to it. Select Start Watching to wait for the application process to start. Launching in Core Mode The Core mode is used to inspect core files crash dumps that are generated from crashed processes on Linux and Unix systems if the system is set up to allow this.
To enable the dumping of core files on a Unix system, enter the following command in the shell from which the application will be launched: ulimit - c unlimited.