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void va_start( va_list arg_ptr, prev_param );
type va_arg( va_list arg_ptr, type );
void va_end( va_list arg_ptr );
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va_listÀàÐ͵ÄÒ»¸ö¶ÔÏó ¶¨Ò壺 typedef char * va_list;
va_start:·ÃÎʱ䳤²ÎÊýÁбíÖеIJÎÊý֮ǰʹÓõĺ꣬Ëü³õʼ»¯ÓÃva_listÉùÃ÷µÄ¶ÔÏ󣬳õʼ»¯½á¹û¹©ºêva_argºÍ
va_endʹÓã»
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va_end:¸Ãºêʹ³ÌÐòÄܹ»´Ó±ä³¤²ÎÊýÁбíÓúêva_startÒýÓõĺ¯ÊýÖÐÕý³£·µ»Ø¡£
vaÔÚÕâÀïÊÇvariable-argument(¿É±ä²ÎÊý)µÄÒâ˼.
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#include <stdio.h>;
#include <string.h>;
#include <stdarg.h>;
/* ANSI±ê×¼ÐÎʽµÄÉùÃ÷·½Ê½£¬À¨ºÅÄÚµÄÊ¡ÂԺűíʾ¿ÉÑ¡²ÎÊý */
int demo(char *msg, ... )
{
va_list argp; /* ¶¨Òå±£´æº¯Êý²ÎÊýµÄ½á¹¹ */
int argno = 0; /* ¼Í¼²ÎÊý¸öÊý */
char *para; /* ´æ·ÅÈ¡³öµÄ×Ö·û´®²ÎÊý */
/* argpÖ¸Ïò´«ÈëµÄµÚÒ»¸ö¿ÉÑ¡²ÎÊý£¬ msgÊÇ×îºóÒ»¸öÈ·¶¨µÄ²ÎÊý */
va_start( argp, msg );
while (1)
{
para = va_arg( argp, char *); /* È¡³öµ±Ç°µÄ²ÎÊý£¬ÀàÐÍΪchar *. */
if ( strcmp( para, "\0") == 0 )
/* ²ÉÓÿմ®Ö¸Ê¾²ÎÊýÊäÈë½áÊø */
break;
printf("Parameter #%d is: %s\n", argno, para);
argno++;
}
va_end( argp ); /* ½
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extern "C" {
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