shell c 混合编程 system 输出数据到变量【转】转自:http://www.cnblogs.com/wangkangluo1/archive/2012/02/08/2342597.htmlshell c 混合编程 system 输出数据到变量

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我是靠谱客的博主甜美柚子，最近开发中收集的这篇文章主要介绍shell c 混合编程 system 输出数据到变量【转】转自:http://www.cnblogs.com/wangkangluo1/archive/2012/02/08/2342597.htmlshell c 混合编程 system 输出数据到变量，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

转自:http://www.cnblogs.com/wangkangluo1/archive/2012/02/08/2342597.html

shell c 混合编程 system 输出数据到变量

方法一：（popen）

#include <stdio.h>
#include <stdlib.h>


int main( int argc, char *argv[] )
{


FILE *fp;
int status;
char path[1035];

/* Open the command for reading. */

fp = popen("/bin/ls /etc/", "r");
if (fp == NULL) {

printf("Failed to run commandn" );

exit;

}

/* Read the output a line at a time - output it. */
while (fgets(path, sizeof(path)-1, fp) != NULL) {

printf("%s", path);

}

/* close */

pclose(fp);

return 0;
}

方法二：

#include <stdio.h>
#include <stdlib.h>



static int my_system(const char* pCmd, char* pResult, int size)
{
int fd[2];
int pid;
int count;
int left;
char* p = 0;
int maxlen = size - 1;

memset(pResult, 0, size);
if(pipe(fd))

{

printf("pipe errorn");
return -1;

}
if((pid = fork()) == 0)

{// chile process

int fd2[2];
if(pipe(fd2))

{

printf("pipe2 errorn");
return -1;

}

close(1);

dup2(fd2[1],1);

close(fd[0]);

close(fd2[1]);

system(pCmd);

read(fd2[0], pResult, maxlen);

pResult[strlen(pResult)-1] = 0;

write(fd[1], pResult, strlen(pResult));

close(fd2[0]);

exit(0);

}
// parent process

close(fd[1]);

p = pResult;

left = maxlen;
while((count = read(fd[0], p, left))) {

p = count;

left -= count;
if(left == 0)
break;

}

close(fd[0]);
return 0;
}
int main(void)
{
char result[1025];

my_system("LC_ALL=C ifconfig", result, 1025);

printf("the result isnn%sn", result);
return 0;
}