popen C函数获取linux命令的执行结果

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#include<unistd.h>#include<stdlib.h>#include<stdio.h>#include<string.h>#include<string>#include<iostream>using namespace std;string get_ttyUSBn(string name){FILE *stream;char buf[1024];memset(buf, '\0', sizeof(buf));string strcmd= "sh ~/get_ttyUSBnbyName.sh ";strcmd+=name;//cout<<"shell cmd: "<<strcmd<<endl;const char *chcmd= strcmd.data();stream = popen( chcmd,"r");fread(buf,sizeof(char), sizeof(buf),stream);pclose( stream );string tmp(buf);return tmp;}int main(){string strresult=get_ttyUSBn("mySmartUSB");//const char *chres= strresult.data();//printf("%s",chres);//cout<<strlen(chres)<<endl;cout<<strresult;return 0;}

介绍：

POPEN(3)                                      Linux Programmer's Manual                                      POPEN(3)

NAME
       popen, pclose - pipe stream to or from a process

SYNOPSIS
       #include <stdio.h>

       FILE *popen(const char *command, const char *type);

       int pclose(FILE *stream);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       popen(), pclose():
           _POSIX_C_SOURCE >= 2 || _XOPEN_SOURCE || _BSD_SOURCE || _SVID_SOURCE

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