I try to deploy a Qt app on a basic Windows 7 Pro SP1 machine.
My app works fine when I run it inside Qt Creator or on any machine with Qt insllated.
I have read a lot of posts and try many different things without success.
Things tried :
Windeploy Qt
Quick and dirty method of Qt Wiki
Add mingwm10.dll
Add libEGL.dll
Check loaded dll with dependency walker
Check loaded dll with Qt Creator debugger
My app crashes when I run it with these two error messages :
This application failed to start because it could not find or load the Qt platform plugin "windows".
This application has requested the runtime to terminate it in an unsual way. Please contact...
This is my current tree (obtained with windeployqt) :
*.exe
*.dll
platforms/qwindows.dll
imageformats/*.dll
iconengines/*.dll
With dependency walker, I have some red lines even if the app runs normally but nothing interesting.
Dev machine info :
Windows 7 Pro Sp1 64 Bits
Qt Creator 3.3.0
MinGW 4.9.1 32 Bits
Qt SDK 5.4.0
I'm probably doing something wrong but what ?!
The executable seems to search something in the Qt base directory because when I rename it the deployed app doesn't want to work anymore.
Need help please ;)
Ok, I found the solution...
I added this line at the very beginning of my main function :
QApplication::addLibraryPath("./");
After that, windeployqt does the job.
I hope it will help someone in the future.
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 Creator 4.0.1 (based on Qt 5.6.1) on Windows 7 (64 bit), it finds two kits (Desktop Qt 5.6.1 MCVS2013 64bit2 and Desktop Qt 5.7.0 MCVS2013 64bit), both have two debuggers to choose (MinGW or Debugging tools for windows). So everything seems to be OK, but whenever I press Run for any simple application from examples, the Build indicator goes red, and then disappears, and the exe-file is not created, but IDE does not give any explanation to the reason why.
I'm new to Qt and really want to find out what I am doing wrong and get started with it. The error output is as follows:
Cannot find file: D:\рабочее\БГУИР\qt\first\myfirst\myfirst.pro.
12:30:54: The process "C:\Qt\5.7\msvc2013_64\bin\qmake.exe" exited with code 2.
Error while building/deploying project myfirst (kit: Desktop Qt 5.7.0 MSVC2013 64bit)
When executing step "qmake"
Maybe the Cyrillic charset causes the problem?
There has to be an output of some kind somewhere. If not under the debug tab "issues", then perhaps "Compile output".
I know that on Linux if you are running a QT example, you have to make sure you have made a copy of the code instead of running it in place. Otherwise, Qt will try to create a build folder under /opt and fail due to permission. You could also specify such a build folder when you configure the project. I am not sure whether on Windows it is going to be an issue, but it's a good place to check.
Hope this helps.
I tried making an executable file of my program but there are some errors which I did not understand or could not find solutions of. I used my .exe file onto another computer and there was an error. I made my program through QtCreator (v 5.1.1)with my Windows 7, 64-bit laptop. There was an error when I used it in 2 32-bit laptops.
The error message says:
This application failed to start because it could not find or load the Qt platform plugin "windows".
Available platform plugins are: minimal, offscreen, windows.
Reinstalling the application may fix the problem.
I already created a new folder called "platforms" containing "qminimal.dll", "qoffscreen.dll" and "qwindows.dll" in the same level of my .exe file. I also pasted in the same level the other DLLs that my program needs.
In Qt 5.2, there is a tool that can be used for deployment on Windows: windeployqt. It will be in the bin folder of your Qt installation. It greatly simplifies deployment, so if you don't mind downloading a newer Qt version, I'd highly recommend it. It may even work with an older Qt version, but I haven't tested it.
We had exact same problem with Qt5.3.
Problem arised when we've rebuilt the Qt to reduce dependencies (e.g. Qt5Positioning, Qt5Sensors).
Created dlls were copied to different directory (source for installation), but we forgot to copy also newly created platforms plugin dlls.
The problem was fixed by using all dlls from same Qt build (with same configuration).
Your problem is probably the same: mixing dlls from different Qt builds (e.g. different configuration, version,...).
I had a working C++/Qt application. I updated MinGW, Qt and Qt Creator to the latest versions, and now I get an error at compile time. This error does not seem to be due to my code, but to the build system.
E.g.:
17:11:15: Running steps for project MyTest...
17:11:15: Starting: "C:\Qt\qtcreator-2.6.0\bin\jom.exe" clean
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
17:11:20: The process "C:\Qt\qtcreator-2.6.0\bin\jom.exe" exited with code 3.
In the project settings there is the message "qmake: No Qt version set. Cannot run qmake."
My source code is just what you get automatically when you create a new application.
I updated the system environment path with the new Qt and QtCreator directories.
I do not know what else to do...
Thank you!
---
Windows 7
MinGW
Qt 4.8.4
Qt Creator 2.6.0 (based on Qt 4.8.3 32 bit)
Please go to Tools->Options->Build & Run->Kits and check that there is a Qt version set up in the kit you are using.
If not, then check the Qt versions creator detected in Tools->Options->Build & Run->Qt versions. Is the version you want to use there? If not: Add it here.
Then return to the kits page and set one of the kits to use that version. Double check the other information while there.
Now you should be able to build your project. You might need to close/reopen it though.
Initial setup seems to be a bit bumpy... but it works really well once you get over that initial hurdle:-( There are quite some improvements in the next update for this. Check the Qt 5 RC2 packages, the creator included there already contain most of the fixes if you are curious).
I'm trying to build the Windows version of my app. The program compiles and runs fine on Qt Creator but when I try to run it standalone it throws the following error:
The procedure entry point _Z17qt_message_output9QtMsgTypePKc could not be located in the dynamic link library QtCore4.dll
I have all the necessary dlls in my application folder and they are the same ones that came with the binaries I've downloaded from the Qt's website. This error is driving me crazy for I can't seem to find any reason for it. The application runs fine on Linux and MAC OS X.
Ok I found the problem. I was copying the wrosng dll (not sure why Qt ships with 2 different versions).
The right ones are in:C:\Qt\2010.05\qt\bin and NOT in C:\Qt\2010.05\bin
I hope this helps anyone who might stumble upon this issue.