【C程式】popen擷取系統命令的輸出內容

來源:互聯網
上載者:User
#include <stdio.h>#include <string.h>#include <stdlib.h>int main (void){    int ssh_cnt = 0;    char cmd[256] = {0};    int status = 0;    FILE* fp = NULL;    scanf ("%d", &status);    // 迴圈2次,間隔1s    while (ssh_cnt < 2) {        sleep(1);        memset(cmd, 0, sizeof(cmd));        snprintf(cmd, sizeof(cmd), "echo start....");        // fp指標擷取了start...這句輸出內容        if (NULL != (fp = popen(cmd, "r")))        {            char out_buf[32] = {0};            if (NULL != fgets(out_buf, sizeof(out_buf), fp))            {                int tmp_status = atoi(out_buf);                if (tmp_status != status)                {                    memset(cmd, 0, sizeof(cmd));                    snprintf(cmd, sizeof(cmd), "echo 'Your print is %d'", status);                    system(cmd);                    ssh_cnt++;                } else {                    break;                }            }        }    }    close(fp);    return 0;}
測試程式,可修改為介面函數,把一些只能通過linux命令擷取到的內容拿到,在代碼上下文中使用。

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