Qt — Could not find or load platform plugin “windows” — but it’s right there! — dynamic build
I’ve done a lot of searching and none of the solutions I’ve found worked.
I’ve followed this «Deploy an App on Windows — even the quick and dirty method failed.
I have the /platforms/qwindows.dll in my app root directory.
I’ve used the dependancy walker app depend.exe we all know and love
Frankly I don’t understand this. language barrier? It says that there are DLLs missing, DCOMP.dll , API-MS-WIN-APPMODEL-RUNTIME-L1-1-0-.dll , API-MS-WIN-CORE-WINRT -ERROR-L1-1-0, -L1-1-0, -ROBUFFER-L1-1-0, -STRING-L1-1-0.DLL and API-MS-WIN-SHCORE-SCALING-l1-1-0.dll , but they are nowhere to be found. Similarily named dlls are included in kernel.dll and MSVCRT.dll. It also mentions IESHIMS.dll , but including it doesn’t make a difference.
I have following dlls in my folder:
- /platforms/qwindows.dll
- icuin53.dll
- icudt53.dll
- icuuc53.dll
- libEGL.dll (even though my app doesn’t use it)
- libgcc_s_dw2-1.dll
- libopencv_core2410.dll
- libopencv_highgui2410.dll
- libopencv_imgproc2410.dll
- libstdc++-6.dll
- IEShims.dll
- libwinpthread-1.dll
- Qt5Core.dll
- Qt5Gui.dll
- Qt5Widgets.dll
Copied from C:\Qt\5.4.0\5.4\mingw491_32
There’s an identical problem with the debug version of the exe, that has *d.dll libraries with it.
I am using Qt 5.4.0 and Mingw32 4.9.1 on Windows 7 64-bit.
The app obviously compiles and runs on my netbook, every other PC gives me the error, however I MUST distribute it. When I change C:\Qt to a different folder name, my netbook also produces the error.
Strange thing is, few versions of the app earlier, there wasn’t any kind of problem. I’ve added a ton of code since then, but I don’t remember anything that’d use a different library.
Qt 5.1.1: Application failed to start because platform plugin “windows” is missing
Edit: Some people started to mark my question as a duplicate. Do not forget that many similar questions existed when I asked this one (see e.g. the list below). However, none of these answers solved my problem. After a long search I found a comment which had been ignored by all users pointing to the missing lib. Now, many months later, the comment has been changed to an answer. However, when I answered this question by msyself I intended to help other people by directly providing the solution. This should not be forgotten and so far my answer helped a lot of people. Therefore my question is definitely not a duplicate. By the way: The accepted answer within the provided link on top does not solve the problem!
Yes, i used the search:
However, in my case the problem still persists. I am using Qt 5.1.1 with Visual Studio 2012 and developed my Application on Windows 7 with Qt Creator 2.8.1. Application is compiled in «Release»-mode and can be executed if directly started with Qt Creator.
However, when starting from the «release»-Folder, i get the following message:
This application failed to start because it could not find or load the Qt platform plugin «windows». Available platform plugins are: minimal, offscreen, windows.
Folder structure looks like this:
Platforms is the folder directly copied from Qt\Qt5.1.1\5.1.1\msvc2012\plugins\platforms including e.g. qwindows.dll. Does not matter if I rename it to «platform» as some other users did. Qt is still not finding the «platform plugin windows», where is my mistake?
17 Answers 17
Okay, as posted here https://stackoverflow.com/a/17271172/1458552 without much attention by other users:
The libEGL.dll was missing! Even though this has not been reported when trying to start the application (all other *.dlls such as Qt5Gui.dll had been reported).
I created a platforms directory next to my exe location and put qwindows.dll inside, but I still received the «Failed to load platform plugin «windows». Available platforms are: windows» error.
I had copied qwindows.dll from C:\Qt\Qt5.1.1\Tools\QtCreator\bin\plugins\platforms, which is not the right location. I looked at the debug log from running in Qt Creator and found that my app was looking in C:\Qt\Qt5.1.1\5.1.1\mingw48_32\plugins\platforms when it ran in the debugger.
When I copied from C:\Qt\Qt5.1.1\5.1.1\mingw48_32\plugins\platforms, everything worked fine.
The release is likely missing a library/plugin or the library is in the wrong directory and or from the wrong directory.
Qt intended answer: Use windeployqt. see last paragraph for explanation
Create a folder named «platforms» in the same directory as your application.exe file. Copy and paste the qwindows.dll, found in the /bin of whichever compiler you used to release your application, into the «platforms» folder. Like magic it works. If the .dll is not there check plugins/platforms/ ( with plugins/ being in the same directory as bin/ )
Setting the QT_QPA_PLATFORM_PLUGIN_PATH environment variable to %QTDIR%\plugins\platforms\ worked for me.
It was also mentioned here and here.
I ran into this and none of the answers I could find fixed it for me.
My colleauge has Qt (5.6.0) installed on his machine at: C:\Qt\Qt5.6.0\5.6\msvc2015\plugins
I have Qt (5.6.2) installed in the same location.
I learned from this post: http://www.tripleboot.org/?p=536, that the Qt5Core.dll has a location to the plugins written to it when Qt is first installed. Since my colleague’s and my Qt directories were the same, but different version of Qt were installed, a different qwindows.dll file is needed. When I ran an exe deployed by him, it would use my C:\Qt\Qt5.6.0\5.6\msvc2015\plugins\platforms\qwindows.dll file instead of the one located next to the executable in the .\platforms subfolder.
To get around this, I added the following line of code to the application which seems to force it to look next to the exe for the ‘platforms’ subfolder before it looks at the path in the Qt5Core.dll.
I added the above line to the main method before the QApplication call like this:
create dir platforms and copy qwindows.dll to it, platforms and app.exe are in the same dir
cd app_dir mkdir platforms xcopy qwindows.dll platforms\qwindows.dll
Folder structure + app.exe + platforms\qwindows.dll
I found another solution. Create qt.conf in the app folder as such:
And then copy the plugins folder into the app folder and it works for me.
Most of these answers contain good (correct) info, but in my case, there was still something missing.
My app is built as a library (dll) and called by a non-Qt application. I used windeployqt.exe to set up the Qt dlls, platforms, plugins, etc. in the install directory, but it still couldn’t find the platform. After some experimentation, I realized the application’s working directory was set to a different folder. So, I grabbed the directory in which the dll «lived» using GetModuleHandleExA and added that directory to the Qt library path at runtime using
This worked for me.
For me the solution was to correct the PATH variable. It had Anaconda3\Library\bin as one of the first paths. This directory contains some Qt libraries, but not all. Apparently, that is a problem. Moving C:\Programs\Qt\5.12.3\msvc2017_64\bin to the front of PATH solved the problem for me.
I had this problem while using QT 5.6, Anaconda 4.3.23, python 3.5.2 and pyinstaller 3.3. I had created a python program with an interface developed using QTcreator, but had to deploy it to other computers, therefore I needed to make an executable, using pyinstaller.
I’ve found that the problem was solved on my computer if I set the following environment variables:
But this solution only worked on my PC that had conda and qt installed in those folders.
To solve this and make the executable work on any computer, I’ve had to edit the «.spec» (file first generated by pyinstaller) to include the following line:
datas=[( ‘C:\Miniconda3\pkgs\qt-5.6.2-vc14_3\Library\plugins\platforms*.dll’, ‘platforms’ ),]
This solution is based on the answers of Jim G. and CrippledTable
I had the same problem and solved it by applying several things. The first, if it is a program that you did with Qt.
In the folder (in my case) of «C: \ Qt \ Qt5.10.0 \ 5.10.0 \ msvc2017_64 \ plugins» you find other folders, one of them is «platforms». That «platforms» folder is going to be copied next to your .exe executable. Now, if you get the error 0xc000007d is that you did not copy the version that was, since it can be 32bits or 64.
If you continue with the errors is that you lack more libraries. With the «Dependency Walker» program you can detect some of the missing folders. Surely it will indicate to you that you need an NVIDIA .dll, and it tells you the location.
Another way, instead of using «Dependency Walker» is to copy all the .dll from your «C: \ Windows \ System32» folder next to your executable file. Execute your .exe and if everything loads well, so you do not have space occupied in dll libraries that you do not need or use, use the .exe program with all your options and without closing the .exe you do is erase all the .dll that you just copied next to the .exe, so if those .dll are being used by your program, the system will not let you erase, only removing those that are not necessary.
I hope this solution serves you.
Remember that if your operating system is 64 bits, the libraries will be in the System32 folder, and if your operating system is 32 bits, they will also be in the System32 folder. This happens so that there are no compatibility problems with programs that are 32 bits in a 64-bit computer. The SysWOW64 folder contains the 32-bit files as a backup.
For a MinGW platform and if you are compiling a Debug target by a hand made CMakeLists.txt written ad hoc you need to add the qwindows.dll to the platform dir as well. The windeployqt executable does its work well but it seems that for some strange reason the CMake build needs the release variant as well. In summary it will be better to have both the qwindows.dll and qwindowsd.dll in your platform directory. I did not notice the same strange result when importing the CMake project in QtCreator and then running the build procedure. Compiling on the command line the CMake project seems to trigger the qwindows.dll dependency either if the correct one for the Debug target is set in place (qwindowsd.dll)
Use this batch file: RunWithQt.bat
- to use it, drag your gui.exe file and drop it on the RunWithQt.bat in explorer,
- or call RunWithQt gui.exe from the command line
If you have Anaconda installed I recomend you to uninstall it and try installing python package from source, i fixed this problem in this way
The application qtbase/bin/windeployqt.exe deploys automatically your application. If you start a prompt with envirenmentvariables set correctly, it deploys to the current directory. You find an example of script:
Lets say, you wanted to have some CGAL-Demos portable. So you’d have a folder «CGAL», and in it, 1 subfolder called «lib»: all (common) support-dlls for any programs in the CGAL-folder go here. In our example, this would be the Dll-Download: simply unzip into the «lib» directory. The further you scroll down on the demos-page, the more impressive the content. In my case, the polyhedron-demo seemed about right. If this runs on my 10+ yo notebook, I’m impressed. So I created a folder «demo» in the «CGAL»-directory, alongside «lib». Now create a .cmd-file in that folder. I named mine «Polyhedron.cmd». So we have a directory structure like this:
In this little example, «Polyhedron.cmd» contains the following text:
All scripts can be the same apart from the last line, obviously. The only caveat is: the «DOS-Window» stays open for as long as you use the actual program. Close the shell-window, and you kill the *.exe as well. Whereever you copy the «CGAL»-folder, as the weird «%
Блог системного администратора
Сайт посвящен тому с чем может столкнуться среднестатистический «эникейщик»
Ошибка: This application failed to start because it could not find or load the Qt platform plugin «windows».
Итак, после установки путём прямого копирования приложения написанного на С++ с использованием библиотеки Qt Получаем следующую ошибку: This application failed to start because it could not find or load the Qt platform plugin «windows». Available platform plugins are: windows. Reinstalling the application may fix this problem. Под катом решение.
Решение банально просто, если при сборки дистрибутива мы положили в папку все нужные .dll однако на компьютере, на котром у нас установлен Qt сама Qt platform уже установлена и и систама не напомнит нам ошибкой о необходимости добавить qwindows.dll к дистрибутиву. Итого простое решение: Добавить в проект каталог «platforms» и скопировать туда файл qwindows.dll. Проблема решена, приложение находит Qt platform по адресу ./platforms/qwindows.dll
Кроме того на просторах интернета рекомендуют варианты решения которые лично я пока не проверял, однако прицитирую их:
- Выставить переменную окружения QT_QPA_PLATFORM_PLUGIN_PATH, указать в ней путь до папки с qwindows.dll
- При инициализации приложения в функции main() добавить строчку вида: qApp->addLibraryPath( «C. наш путь . /plugins» );
- Использовать аргумент командной строки «-platformpluginpath \«путь_к_папке_с_qwindows.dll\»»
Конечно те варианты, которые позволяют реить проблему на уровне создания дистрибутива предпочтительнее, однако их надежность ёщё стоит проверить.
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Итак, после установки путём прямого копирования приложения написанного на С++ с использованием библиотеки Qt Получаем следующую ошибку: This application failed to start.
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