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csdl-2mingw-w64

Getting screen resolution in C, w/o "windows.h"

Just working on a small project using SDL2...

System info: Windows

App info: using C (pure C, no c++), mingw-x64 & SDL2.

Now;

Firstly, SDL.h requires the main function to be renamed as WinMain.

On the other hand, when getting the screen resolution, I tended to use the GetSystemMetrics function, which requires windows.h to be included in the pre-processor section and at this point, WinMain in my code conflicts with WinMain declared previously in winbase.h. When I'm using both (SDL.h and windows.h), compiler responds:

previous declaration of 'WinMain' was here: int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd);

That's because, WinMain is declared somewhere in the winbase.h, which is auto-included via windows.h.

Is there a way to get the screen resolution w/o using GetSystemMetrics / windows.h? Any other ideas?

Solution

  • Ok! I've realized what I was doing wrong...

    For the linking phase, I was using the following libraries and the linker was complaining about the WinMain function not to be found.

    -lSDL2main
-lSDL2

    Then I added the mingw32 library as shown below and the problem got solved (the order of the libraries does matter I think).

    -lmingw32
-lSDL2main
-lSDL2