Win32 program Link error: LNK2019

[Robertlzw]

Hi folks,

I want to know how to compile Win32 program using MS 32-bit C/C++ Compiler (cl.exe) of Visual Studio 2008 professional. But I got the LNK2019 error (unresulved external simbol__imp__MessageBoxA) when compiling the following code (Simple.c) with "cl Simple.c" command:

#include<windows.h>

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
	MessageBox(NULL, TEXT("Goodbye, cruel world!"), TEXT("Note"), MB_OK);
	return 0;
}

What was wrong with it? (In VS 2008 IDE, the above code does compile, but from VS 2008 command window it does not.)

[kbw]

You're not linking with user32.lib

[Robertlzw]

Then how can I link it with user32.lib? kbw, can you show me the command? Thank you.

[kbw]

cl -W4 g.cpp -l user32.lib

Remeber to run the appropriate vsvars.bat in your console before running cl. If you're doing this in Visual Studio, the include/lib paths, libraries and so on are already setup in the project by the wizard.

[Mazd]

Hey man make it clear. I have same problem.

[Mazd]

Yap.I got the answer.Write
<code>#progma comment(lib,"user32.lib");</code>
after<code> #include<windows.h></code>

[kbw]

If you're using the IDE, add it to the linker section. If should be set up by default, not in your code.

[Robertlzw]

kbw's answer solved my problem as follows:
(1) launch Visual Studio 2008 Command Window;
(2) cl Simple.c user32.lib // Simple.c being my win32 program I originally posted at the top of this thread
Done