How to profile a Qt program using Qt creator with msvc compiler?
To the best of my knowledge, there is no integrated equivalent to valgrind in QtCreator for Windows.
On the other hand, you can use a stand-alone application like very sleepy, which supports any native Windows app. It just attaches to a running process and lets you analyze the captured data through the functions of the process. It has been useful to me for finding performance bottlenecks in QtCreator applications that needed to be compiled with MSVC.
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I have a project based on Qt which use QWebEngine. For compiling this project i've installed Visual Studio Express 2015 and have configured kits. My project is built, all is fine. But now i need to compile my project for Windows XP platform. I know, that for doing this it is needed to change toolset from v140 to v140_xp.
How can i set the toolset from qtcreator?
I tried to determine the difference in compiler options in both cases. For doing that I've created test project in Visual Studio. There i change the toolset and look at Project Properties -> C/C++ -> Command Line Options. But seems that nothing changes there.
Qt WebEngine module does not support Windows XP targeting, so this won't work anyway. Even if it did, you'd need to build a copy of Qt that targets Windows XP - otherwise your application will target Windows XP, but not the Qt library it uses, and it won't work that way.
For completeness sake, here's how you'd do it assuming that you got Qt built targeting Windows XP:
There only two ways to do it currently without patching Qt Creator itself:
Execute Qt Creator with environment variables already setup up for the XP toolset enabled for command line use. I.e. target XP from command line, and launch Qt Creator from there.
Add relevant environment variable settings to the Build environment of the project in Qt Creator.
The details of environment variables needed to target Windows XP are given e.g. here.
For Windows XP portability, you should be using the semi-maintained for of the qtwebkit module. It builds and works on XP, and works with most recent Qt IIRC.
Note: It's certainly possible to target XP using WebEngine and Angle, but it requires lots of patches to current Qt. It's not an insignificant effort, and you'd definitely want to test it on the graphics cards that you intend to target - the DirectX 9 drivers on some of those machines are buggy, and while the code is correct and compiles and runs, it may not work on some systems. I'd say that it's absolutely not worth the effort.
In VS there is an editbin utility, which could be used as follows
editbin file.exe /SUBSYSTEM:WINDOWS,5.01 /OSVERSION:5.1
I've created a Qt calculator app using Qt Creator 3.6.0 purely in C++ code (I didn't use Designer)
I would like to know how to use Qt to make it installable for publishing.
I ran the app in both Release and Debug modes and have both folders of the two.
I also downloaded and installed Qt Installer Framework Opensource 2.0.1 for my Qt Creator 3.6.0 (the IDE I use for Qt).
And I also have the .dll files needed to run the .exe file.
I've searched the Web for it. But since I'm a novice in Qt I can't do the works properly, or I don't understand. (They seem complicated)
Now, is there any straight forward method to use an installer for the app to make as platform independent as possible?
If so, what installer? And how to do the process? This is the first time for me.
I'm testing an application using Qt 4.7.3 compiled with MinGW on a clean XP virtual box. The application wasn't working and after much grief, I traced the error to needing to download the Visual C++ 2005 redistributable. I downloaded this and it worked. Something doesn't seem right here, shouldn't I not need any VC++ libraries since I'm using MinGW? Could it be a problem with my compilation? I should mention that I'm not using qmake to build.
The dependency on MSVCRT.DLL is due to MinGW itself. To quote mingw.org..
MinGW provides a complete Open Source programming tool set which is
suitable for the development of native MS-Windows applications, and
which do not depend on any 3rd-party C-Runtime DLLs. (It does depend
on a number of DLLs provided by Microsoft themselves, as components of
the operating system; most notable among these is MSVCRT.DLL, the
Microsoft C runtime library.
Also see: Should I redistribute msvcrt.dll with my application?
As noted in the Qt documentation, yes, that is required:
http://doc.qt.io/qt-5/windows-deployment.html
I just have a little question about running Qt created apps on different operating systems.
As a normal user do i have to install Qt framework to run Qt apps ?
I mean i've created Qt app using Windows , then i made a build for Linux .
Do i need to install the Qt framework on the Linux pc inorder to run that app ?
Or there is a way to package all the needed libraries into the app installer .
Best Regards
You can deliver the dynamic libs you need with your application, as it's described here:
http://doc.qt.io/qt-5/deployment.html
Since Qt is not a system library, it has to be redistributed along
with your application; the minimum is to redistribute the run-time of
the libraries used by the application. Using static linking, however,
the Qt run-time is compiled into the executable.
Depends what you mean by 'framework', you will need the runtime libraries, unless you paid Nokia for a license to allow static linking.
For Linux, I think you would generally ensure that the Qt packages have been installed during installation (i.e. make them a requirement of the package you provide). Under Mac OS you would need to package the .so (shared objects) with your application. Under Windows you do the same (provide the .dlls) and install them with the application (not in the system folders).
The issue with static linking that #cbamber85 is alluding to, is the conformance with the LGPL licence where it's legal to link to the libraries at runtime but not at compile time (i.e. use the .so/.dll but not the .a files).
Greetings all,
We are developing a QT application (QT 4.6 LGPL version) in Linux platform.All the libraries we use are cross-platform.
Now we want to port it into Windows and continue develop in Windows.
My questions are:
Which compiler should we use ,Can we use MinGW or Visual C++ compiler?
2.If its Visual C++ compiler, which Visual Studio version should be used ,can we use 'Visual C++ Studio 2010 express' ?
thanks in advance.
The easiest, by far, is to install QtCreator. it includes MinGW and simply opens the same project files as on linux. compile, and go!
A huge advantage of MinGW over VC++ is that it doesn't make you chase circles around getting the right vcredist library for the exact version of the compiler, nor it cares too much about debug/release builds. To deploy, just be sure to copy the same one or two DLLs you have on the development machine. A few more for Qt, but these are well-documented on Qt docs. No hidden surprises.