SCRNSIZE.C

/*---------------------------------------------------------------------------
    SCRNSIZE.C -- Displays screen size in a message box
                 (c) Charles Petzold, 1998
----------------------------------------------------------------------------*/
#include <windows.h>
#include <tchar.h>   
#include <stdio.h>   
int CDECL MessageBoxPrintf (TCHAR * szCaption, TCHAR * szFormat, ...)
{
    TCHAR   szBuffer [1024] ;
    va_list pArgList ;

    // The va_start macro (defined in STDARG.H) is usually equivalent to:
    // pArgList = (char *) &szFormat + sizeof (szFormat) ;

    va_start (pArgList, szFormat) ;

    // The last argument to wvsprintf points to the arguments

    _vsntprintf ( szBuffer, sizeof (szBuffer) / sizeof (TCHAR),
                   szFormat, pArgList) ;

    // The va_end macro just zeroes out pArgList for no good reason
    va_end (pArgList) ;
    return MessageBox (NULL, szBuffer, szCaption, 0) ;
}
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   PSTR szCmdLine, int iCmdShow)
{
    int cxScreen, cyScreen ;
    cxScreen = GetSystemMetrics (SM_CXSCREEN) ;
    cyScreen = GetSystemMetrics (SM_CYSCREEN) ;

    MessageBoxPrintf (    TEXT ("ScrnSize"),
                   TEXT ("The screen is %i pixels wide by %i pixels high."),
                   cxScreen, cyScreen) ;
    return 0 ;
}