#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/shm.h>
char *  al(char *);
int main (int argc,char * argv[])
{      
        printf("%s \n",al("www.baidu.com"));
        return 0;
}
char * al(char * www)
{
        char buffer[100];
        char *ip=(char *)malloc(sizeof(char) * 15);
        memset(buffer,0,sizeof(buffer));
        sprintf(buffer,"ping %s",www);
        FILE * fp=popen(buffer,"r");
        memset(buffer,0,sizeof(buffer));
        fgets(buffer,sizeof(buffer),fp);
        ip  = strtok(buffer,")");
        ip  = strtok(ip,"(");
        ip  = strtok(NULL,"(");
        printf(ip);         //不加这个printf  输出见【a】 加上这个语句就正常  见【b】
        return ip;
}
~

结果：
[@localhost ~]$ cd Templates/
[@localhost Templates]$ gcc 2.c -o 2.out
[@localhost Templates]$ ./2.out
[a]输出：
[@localhost Templates]$ gcc 2.c -o 2.out
[@localhost Templates]$ ./2.out
[b]输出:180.97.33.107180.97.33.107
[@localhost Templates]$

哪位帮忙看看










[ 本帖最后由 glarm 于 2015-9-17 10:08 编辑 ]