Issues running WinMain in C-CodePudding

Currently I'm having issues with WinMain in C (specifically in Visual Studio).

For instance...

#include <stdio.h> 
#include <Windows.h>

int WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, 
    PSTR lpCmdLine, INT nCmdShow)
{

    return(0);
}

1>------ Build started: Project: GameB, Configuration: Debug x64 ------
1>LIBCMTD.lib(exe_main.obj) : error LNK2019: unresolved external symbol main referenced in function "int __cdecl invoke_main(void)" (?invoke_main@@YAHXZ)
1>E:\James\VisualStudio\CProjects\GameB\x64\Debug\GameB.exe : fatal error LNK1120: 1 unresolved externals
1>Done building project "GameB.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Just this basic set-up gives me an "inconsistent annotation for WinMain" warning. I have been searching for any help for 2 days and the the closest I come to an answer is people talking about WinMain in the context of C . I have a feeling this is a problem with Visual Studio as I was originally just using VS Code and managed to get an app (one that generated a pop-up window) to compile and run.

CodePudding user response：

You just set up your winmain wrong. This should work:

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PWSTR pCmdLine, int nCmdShow);

INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    PSTR lpCmdLine, INT nCmdShow)
{
    return 0;
}

Don't forget to #include <Windows.h> and change subsystem to windows.

CodePudding user response：

To use the WinMain program entry point, you need to tell the linker to target the "Windows" subsystem, rather than building a console application. Otherwise, the linker will look for (and fail to find) the standard main entry point for C programs.

In the Solution Explorer, right-click on your project and select "Properties". Then navigate to the "Linker -> System" page and select "Windows (/SUBSYSTEM:WINDOWS)" as the target:

On your "inconsistent annotation" warning, see this Q/A: Inconsistent annotation for 'WinMain'

Also, as noted in the answer by SNO, you should add the WINAPI attribute to your WinMain function.

CodePudding user response：

You need to set subsystem from Console to Windows in settings, by right clicking your project in the solution explorer, selecting properties, and going to Linker->System and setting SubSystem to Windows(/SUBSYSTEM:WINDOWS).