Currently, I am trying to make a Windows application using C++. For compiling my program I use MinGW (GCC). But as soon as I use int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow)
instead of int main()
the compiler shows me the following message:
C:/mingw-w64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/lib/../lib/libmingw32.a(lib64_libmingw32_a-crt0_c.o):crt0_c.c:(.text.startup+0x2e): undefined reference to `WinMain'
collect2.exe: error: ld returned 1 exit status The terminal process terminated with exit code: 1
The example code I tried to compile I got from this Windows application tutorial: Example Code
I have already tried reinstalling MinGW but it did not help (also I'm using Windows 10).
This error means that the linker is looking for a function named WinMain to use as the entry point. It would be doing that because you configured the project to target the GUI subsystem, but did not provide a WinMain function.
It's not your program that's wrong, it's something in the build process. WinMain@16 is referring to the "real" entry point of a windows exe. In a console application this is provided by C-runtime library. The first thing I would look at is that you are telling your compiler to build a console app.
This example code uses wWinMain
but
One thing to note is that Visual C++ supports a “wWinMain” entry point where the “lpCmdLine” parameter is a “LPWSTR”. You would typically use the “_tWinMain” preprocessor definition for your entry point and declare “LPTSTR lpCmdLine” so that you can easily support both ANSI and Unicode builds. However, the MinGW CRT startup library does not support wWinMain, so you’ll have to stick with the standard “WinMain” and use “GetCommandLine()” if you need to access command line arguments.
via Building Win32 GUI Applications with MinGW
In this specific case, you can use WinMain
instead. This program doesn't use pCmdLine
value, so it should compile when you change wWinMain
to WinMain
and PWSTR pCmdLine
to PSTR pCmdLine
.
If you later would need unicode command line use LPWSTR cmd_line = GetCommandLineW();
instead of WinMain
argument.
Newer Mingw versions also support -municode
linker option switching to alternate startup code allowing to use wWinMain
instead of WinMain
(or wmain
instead of main
). Add it to your command line, linker options in IDE or makefile.
g++ other_options_and_arguments -municode
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