module first;

import core.runtime;
import win32.windef;   
import win32.winnt;    
import win32.winbase;  
import win32.winuser;  
import win32.wingdi;   

extern (Windows)
int WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    int result;

    void exceptionHandler(Throwable e)
    {
        throw e;
    }

    try
    {
        Runtime.initialize(&exceptionHandler);

        result = myWinMain(hInstance, hPrevInstance, lpCmdLine, nCmdShow);

        Runtime.terminate(&exceptionHandler);
    }
    catch (Throwable o)		// catch any uncaught exceptions
    {
        MessageBox(null, cast(char *)o.toString(), "Error",
                MB_OK | MB_ICONEXCLAMATION);
        result = 0;		// failed
    }

    auto res = MessageBox(NULL, "Hello!", "HelloMsg", MB_YESNOCANCEL | MB_DEFBUTTON2 | MB_ICONINFORMATION);
    assert(res == IDYES);  // throws if user doesn't click yes
    
    return result;
}

int myWinMain(HINSTANCE hInstance,
	HINSTANCE hPrevInstance,
	LPSTR lpCmdLine,
	int nCmdShow)
{
    return 1;
    /* ... insert user code here ... */
}