三、宽字符和 Windows—格式化消息框

程序2-1  SCRNSIZE
        
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 ;
        
}