popen在程序内调用可执行程序

一般有3种方法：1.exec函数 2.system函数 3. popen

int xpipe(char *cmdname, char *outbuf, int outlen)
{
    int ret = 0;
    FILE *pf;

    pf = popen(cmdname, "r");
    if( !pf )
        return -1; 

    if(outbuf)
    {   
        ret = fread(outbuf, 1, outlen-1, pf);
        if(ret<=0)
        {   
            pclose(pf);
            return ret;
        }   

        while( outbuf[ret-1] == '\r' || outbuf[ret-1] == '\n' )
            ret--;
        outbuf[ret] = 0;
    }   

    pclose(pf);
    return ret;
}

原文：http://blog.csdn.net/aa838260772/article/details/42676751