I have a project written in Qt that I have no problems compiling and running on Linux. The command line is:
qmake ../trunk/GSDTesting.pro
The process on Linux was really simple: install a few dependencies using apt and you are off.
My task is to recompile the same program on Windows using Visual Studio C++ compiler, but the problem is I don't know how to start. There is no such thing as qmake for Windows.
Can someone give me a few hints where to start. Please note that I don't know QT almost at all, my task is just to debug some issue unrelated to QT.
Are you using terminal exclusively on Windows? If so, maybe this image of example build steps straight from Qt Creater 4.14.2 may help you:
As you can see the image of the default Qt creator build steps list the file path where 'qmake.exe' can be located on a local installation of the toolchain.
If you can use a machine with a display I find using the Qt creator GUI is not all that bad.
Here is a link to the base get started page:
https://doc.qt.io/qt-5/gettingstarted.html
Here is a link to the installer download page:
https://www.qt.io/download
IMPORTANT:
You will need to make a Qt account, login to your account, and then download the open-source version of the API. The commercial version of the same source is acquired differently/seperately.
Otherwise, if you cannot use the GUI, can I request some clarification on why you cannot use Qt creator on your Windows installation?
Related
I downloaded C++ code from GitHub to tag images for training an object detector using Machine Learning.
Within Qt Creator 4.2.1 Based on Qt 5.8.0 (MSVC 2015, 32bit), I was able to compile and run the code. Unfortunately, I was not able to run the .exe outside of Qt Creator.
Initially, I received an error that
"The program can't start because libgcc_s_dw2-1.dll is missing".
Thanks to
QT The program can't start because libgcc_s_dw2-1.dll is missing, that was fixed easily by adding
"QMAKE_LFLAGS += -static"
to the .pro file. Now, when I run it I get
"The application was unable to start correctly (0xc000007b). Click OK to close the application."
I was able to reproduce the error using the simple "Hello World" default project that appears when you create a Qt Widget Application. This led me to believe something was wrong with my installation.
Based on the advice of this article: https://stackoverflow.com/questions/12099117/32-bit-qt-application-on-win-7-x64-wont-run-but-runs-fine-from-qt-creator, I used Dependency Walker to identify possible causes. I expected to see only a few items that I can follow up on. Instead, I received a list of close to 100 missing .dll files. All the files started with
"API-MS-WIN ###.DLL" or "EXT-MS ###.DLL"
where ### represent some additional text characters, for example;
"API-MS-WIN-SHCORE-STREAM-WINRT-L1-1-0.DLL"
I'm attaching a sample output.
Another suggestion was to copy over
libwinpthread-1.dll, libstdc++-6.dll, libgcc_s_dw2-1.dll.
That did not work either.
My next move was to simply get the latest version of QT and wish for the best. I installed Qt Creator 4.8.1 Based on At 5.12.0 (MSVC 2015, 32 bit). This time, I could not even get the code to run in the IDE. I received 1000+ error messages!
Based on advice from several pages, I added
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
to the .pro file and it still would not compile.
Also, I verified that the application is being built as a 32bit application. I'm running on a 64 bit Windows 10 system.
If anyone would like to take a crack at it to see if they can create a working .exe, here is the link: github.com/clavicule/BBTag
Qt provides a tool to copy the necessary dlls to the folder of your executable.
The tools is called windeployqt.exe and comes with your Qt installation. For me it is located at C:\Qt\5.9.1\msvc2015_64\bin\windeployqt.exe. You will have to look at your installation path and probably the msvc_32 folder to find it.
Then you go to the folder with your executable in it, oben a command prompt or powershell and execute path\to\windeployqt.exe yourProgram.exe and it will automatically copy the necessary dll files to this folder. Afterwards you can run your program without issues.
The official documentation for the tool can be found here.
Alternative 1: While developing you could use QtCreator which automatically adds the paths to the dlls when running your program - make sure to include them if you deploy your program!
Alternative 2: Add the path to the necessary dlls to your PATH variable. This isn't recommended either, since everyone who gets your program would have to do the same to run it.
I figured it out! My installation of Anaconda (a Python distribution popular for data science and machine learning) is the culprit.
From: #remy-lebeau
The application was unable to start correctly (0xc000007b)
The error:
"The application was unable to start correctly (0xc000007b) ..."
is a good indicator that the 32-bit app tried to load a 64-bit DLL. At first, this did not make sense since I verified many times that I was using the 32 bit version of Qt.
It turns out that the installation of the 64 bit version of Anaconda also contained many Qt5 dlls used for the PyQt5 package. Since the path to this folder came before the path to my c:\Qt...\bin folder, it was used in the build instead of the actual 32 bit version installed with Qt. This was not obvious because I was unaware of PyQt5 so I had no idea that it came with Anaconda. A simple reordering of the path entries using the System Environment Variables interface AND a system restart fixed the problem.
Silver lining: I now know C++ and designing GUIs w/ QT and PyQt5
Thanks #albertmand and #jwernerny
I have installed Qt-5.7 on windows 8 because I couldn't build my released .exe from Linux (my favorite) in order to be used on Windows OS even after searching a lot on internet (Where there have to be cross-compilation...). After the installation, I just want to make sure that I can build/run a first application (one of the examples provided by default by Qt-creator "filesystembrows") and I have follow the official guide in order to build Qt as shared libraries, but the issue is that when I type the first command line I get: 'nmake' is not recognized as an internal or external command' Also it still show the same message even though a update the variable environment of the system with C:\Qt\Qt5.7.0\5.7\mingw53_32\bin which one is the default path set-up when installing Qt on windows. Any help just to make a stand alone .exe for Windows (as shared libraries ) please
Why not build your project by using qtcreator ?
Did you test your build environnement by making a test application with qtcreator ?
P.S.: If you want, I can explain how to build application using Visual Studio as a compiler and QtCreator as an IDE.
nmake is a build tool provided with Visual Studio and with Windows SDK. You don't have it, apparently.
It seems you're using a mingw build of Qt; it comes with a bundled copy of mingw. There, the build tool is simply called make.
I have build an app using C++ and Qt on QtCreator. The result is a .app file.
Now, when I am running it from the Qt Creator it is running fine.
But when I am running it on a different machine (with no Qt installed) it is not running.
I have figured out the reason is because my .app file is not deployed properly (as there is no framework folder added in the .app)
But I am now having trouble solving it. I am following this link but not getting anywhere as it for console purely.
Is there a way I can fix it using Qt Creator?
A Qt application relies upon Qt's libraries, which must be shipped with the application, inside the built application bundle. The steps for deploying a Qt application for OS X are detailed in the documentation.
If you're not using any other libraries, besides those of Qt, you just need to run the tool macdeployqt, which is part of the Qt installation, in the bin directory. You can set this up to run as a build step in Qt Creator, but I suggest only doing it before you actually deploy the final bundle to another machine.
Calling macdeployqt will copy the necessary Qt frameworks into the bundle and setup the paths to the frameworks so that the binary in the bundle knows where to find them.
If you use any other frameworks or libraries, you need to copy those yourself and set the references to them using install_name_tool
In my QT GUI application I need playback some video files. I tried the MediaPlayer component (qtmultimedia 5.0), but it cannot read the video containers (mp4/mkv) that I'm using, which VLC player runs without any problem. So I found an library called vlc-qt (http://projects.tano.si/vlc-qt) and downloaded the windows binaries (which seem to be compiled using MSVC 11.0), but it fails to link on QT Creator MinGW (it shows 16 lines of undefined reference), maybe because vlc-qt is compiled with a different compiler than the one used to build the QT app.
I can't find any working references or documentation on this topic, so does anybody know how can I make this?
More details:
Windows 8.1 x64
QT Creator 3.0.1 | QT 5.2.1
vlc-qt 0.9.0
C++
Thank you.
The library is compiled using MSVC so it can not be liked to your application with a MinGW compiler. You can get the code from Here and compile it with MinGW compiler. After that you can link it to your app.
You can download and install CMake from Here. Next open the file named "CMakeLists.txt" from the root of the VLC_Qt source code with Qt Creator. Click "Next" and then after selecting the desired Generator click "Run CMake". WHen everything completes click finish. Now you can build the entire VLC-Qt with Qt Creator.
I am completely frustrated because I have been trying to install Qt on Blackberry Playbook for over a month now. I have followed every single tutorial out there (so much that every time I google Qt and playbook, all links are purple instead of blue). I have downloaded Qt-everywhere source code and tried to compile it using the flags found here, but it tells me that it cannot install opengl, sqlite etc, so I use the --continue option with ./configure and that too crashes saying that it can't find qcc.
I have noticed a Qt library directory when browsing incudes in the qnx IDE, in the project explorer. The thing is when i write a Qt application it can't find the headers.
So Please Help, anyone who has done this in the RECENT past . ps. i am new to cross compiling on linux systems.
Probably quite late to say, but I have created a BlackBerry Native Plugin for Visual Studio 2015, where you can develop apps for BlackBerry PlayBook and Qt in particular.
Simply create new project "Other Languages / BlackBerry Projects / Qt / PlayBook - Qt4 Core Application" and you are ready to go. It downloads all required libraries via NuGet during first build.