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HHOOK g_hMouse;
 
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
	...
 
	g_hMouse = SetWindowsHookEx(WH_MOUSE_LL, LowLevelMouseProc, GetModuleHandle(NULL), 0);
 
	f (!g_hMouse)
    {
        return 0;
    }
 
	while ( GetMessage(&msg, NULL, 0, 0) )
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
 
    UnhookWindowsHookEx(g_hMouse);
 
    return (int) msg.wParam;
}
 
LRESULT CALLBACK LowLevelMouseProc(int nCode, WPARAM wParam, LPARAM lParam)
{
    char szBuf[128];
    int errcode = 0;
 
    LPMSLLHOOKSTRUCT lhook = (LPMSLLHOOKSTRUCT)lParam;
 
    switch (LOWORD(wParam))
    {
        case WM_LBUTTONDOWN:
			...
            break;
    }
 
	return CallNextHookEx(g_hMouse,nCode,wParam,lParam);
}
 

prog.c:1:1: error: unknown type name 'HHOOK'
 HHOOK g_hMouse;
 ^
prog.c:3:14: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'WinMain'
 int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
              ^
prog.c:25:1: error: unknown type name 'LRESULT'
 LRESULT CALLBACK LowLevelMouseProc(int nCode, WPARAM wParam, LPARAM lParam)
 ^
prog.c:25:18: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'LowLevelMouseProc'
 LRESULT CALLBACK LowLevelMouseProc(int nCode, WPARAM wParam, LPARAM lParam)
                  ^

Standard output is empty