问题
I am using Qt 4.6.3 with MinGW on Windows to build Qt apps and now need to add a COM interface to my application. I enabled ActiveQt but was getting post-link errors because I was missing a copy of the MIDL compiler. I downloaded a copy of the latest MS Windows SDK, which includes MIDL, but now MIDL complains it cannot find cl.exe. The only conclusion I can draw is that you can only build ActiveQt applications using the MS compiler, which I would rather avoid. Is a way to get this working with MinGW or am I out of luck?
回答1:
Using the MS compiler and tools seems to be the only reliable way to get this working.
回答2:
Well, you can build ActiveQt with MinGW, but using a bunch of COM stuff on top of that may not be possible, because it may or may not be present in MinGW. Some thoughts:
Using any MS SDK tools with MinGW won't work (exception is mingw.org + DXSDK which should work most of the time).
Are you sure you are linking all necessary libraries when compiling? I can't help more if you don't show the exact error messages.
The mingw-w32/w64 project tries to provide a completer "Windows SDK for GCC"; it may contain the libraries/files you are looking for. They provide a x64 and x86 compiler, and pretty good DX support. I have no experience with their COM stuff, but I believe it would be a bit more complete than mingw.org's. You can always contact the developers on the forums or mailing list, they are very helpful.
回答3:
You could try the Wine implementation of midl, widl. See the Wine wiki page regarding building on Windows.
If you want to give it a quick run, get wine-prgs-0.9.14-mingw.zip and see how it works.
回答4:
I agree with Rob's second post: it's a very bad thing using mingw for construction of ActiveX objects. Mingw has some bugs regarding ActiveX: https://bugzilla.mozilla.org/show_bug.cgi?id=203299 and also: https://qt.gitorious.org/qt/qt/merge_requests/2710. I kill the whole day to discover it. Use Qt for MSVS instead and all will be ok. ;)
回答5:
I've solved this problem next way:
Got QtCreator, Msys2 and VS2015 Community installed.
Launching Qt Creator with batch script:
@echo off
call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" x86 8.1
setlocal
set MSYSTEM=MINGW32
set MSYS2_PATH_TYPE=inherit
start "" "C:\msys64\usr\bin\mintty" -i /msys2.ico -e /usr/bin/bash --login -c "/c/Qt/Tools/QtCreator/bin/qtcreator.exe"
exit /b 0
I am launching QtCreator out of Msys2 envioronment because it provides standart Unix tools needed to build 3rd party in my project. So in theory this is not mandatory to have Msys2 for you.
Please note: do not use WinSDK 10.0 (or above) because it does not have midl.exe in PATH variable.
Doing this way will create PATH environment variable with Qt Creator on top priority (so you will use gcc from Qt installation), Msys2 next (so you can use standard Unix tools) and MSVC and WinSDK 8.1 at last place (so while building you will find midl compiler).
Right now I succeed building dll and passed it to midl form WinSDK, but as for now I am stil trying to register it in system.
来源：https://stackoverflow.com/questions/3138977/building-activeqt-com-applications-with-mingw