MSVC 2010 中的 Qt5 项目，需要多字节字符集，但更改项目的字符集不起作用

Question

I'm in the process of doing my first steps with Qt in MSVC. I'm using Visual Studio 2010 and Qt 5.3.

Everything works fine, but now I have legacy C-code which I have to include in my project. This c-code is using 8-bit characters for loading DLLs and stuff, so to make it work in MSVC, I have to change the project's character set from Unicode to Multibyte. This is working fine with normal C++ applications.

But when I'm now creating a Qt application and use this legacy code, the project seems to use Unicode, despite that fact that I've enabled the Multibyte character set in the Qt application's properties. So I get the following error for example:

error C2664: 'GetModuleFileNameW' : cannot convert parameter 2 from 'char [260]' to 'LPWSTR'

The Qt application seems to ignore my Multibyte character setting in the project's properties and still uses Unicode. How can I change this?

Thanks for all answers!

Answer 1

You need to go to your qt installation mkspecs directory and change the qmake.conf file of the platform you are using.

Change Defines += UNICODE To Defines += _MBCS

Answer 2

In your .pro file, put the lines

DEFINES -= UNICODE
DEFINES += _MBCS