MessageBoxPrintf函式,该函式有许多参数并能像printf那样编排它们的格式。
程式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_CXSCR |