c - 有没有办法使用C程序在.txt文件上获取linux命令(如ifconfig)的输出？

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How can I run an external program from C and parse its output?
                                
                                    （8个答案）
                                
                        
                                6年前关闭。
            
                    
我实际上希望在Linux上使用C程序在.txt文件中获取所有网络参数，例如IP地址，DNS服务器等。

最佳答案

您要popen()。这是一个取自here的示例：

void get_popen_data() {
    FILE *pf;
    char command[COMMAND_LEN];
    char data[DATA_SIZE];

    // Execute a process listing
    sprintf(command, "ps aux wwwf");

    // Setup our pipe for reading and execute our command.
    pf = popen(command,"r");

    if(!pf){
      fprintf(stderr, "Could not open pipe for output.\n");
      return;
    }

    // Grab data from process execution
    fgets(data, DATA_SIZE , pf);

    // Print grabbed data to the screen.
    fprintf(stdout, "-%s-\n",data);

    if (pclose(pf) != 0)
        fprintf(stderr," Error: Failed to close command stream \n");

    return;
}