sprintf(buf,format,...);
虽然sprintf支持可变参数,但一般我们调用时其参数是确定的.
例如:
sprintf(buf,"%d",i);
将f中的可变参数转化为va_list
将valist作为参数来调用vsprintf
其实,printf就是用vprintf写的。
给个例子,这个例子是复制的:
#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) ;
}
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