我是在C 上写作的新手，并且正在努力使用管道在过程之间进行交流。我编写了一个非常简单的程序，该程序在发送字符串或整数时可以工作，但是当我尝试发送struct（在这种情况下是消息）时，我会在另一侧阅读它时会变得无效。有人对此有所了解吗？感谢您的时间。

#include <unistd.h>
#include <iostream>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define BUFFER_LEN sizeof(message)
using namespace std;
struct message{
    int from;
    string msg;
};
void childCode(int *pipeOUT, int *pipeIN, message buffer){
                                    // Local Buffer for input from pipeIN
    cout << "Child: Sending Message"<< endl;
    buffer.msg = "Child:I am the child!!";
    write(pipeOUT[1],(char*) &buffer, BUFFER_LEN);  // Test Child -> Parent comms
    cout << "Child: Message Sent"<<endl;
    read(pipeIN[0],(char*) &buffer,BUFFER_LEN);                     // Test Child <- Parent comms
    cout << "Child: Recieved: "<< buffer.msg << endl;

    cout << "Child Exiting..."<< endl;
    exit(0);                                                    // Child process End
}

int main(int argCount, char** argVector){
    pid_t pid;
    int childPipeIN[2];
    int childPipeOUT[2];
    message buffer;                         // Buffer for reading from pipe
    // Make Parent <- Child pipe
    int ret = pipe(childPipeIN);
    if (ret == -1){
        perror("There was an error creating the childPipeIN. Exiting...");
        exit(1);
    }
    // Make Parent -> Child pipe
    ret = pipe(childPipeOUT);
    if (ret == -1){
        perror("There was an error creating the childPipeOUT. Exiting...");
        exit(1);
    }

    // Fork off Child
    pid = fork();
    if (pid == -1){
        perror("There has been an issue forking off the child. Exiting...");
        exit(1);
    }
    if  (pid == 0){ // Child code
        cout << "Child PID = " << getpid() << endl; 
        childCode(childPipeIN,childPipeOUT,buffer);
    }
    else{ // Parent Code
        cout << "Parent PID = " << getpid() << endl;
        // Test Parent <- Child comms
        read(childPipeIN[0], (char*) &buffer, BUFFER_LEN);
        cout << "Parent: I recieved this from the child...n" << buffer.msg << endl;
        buffer.msg = "Parent: Got you message!";
        // Test Parent -> Child comms
        write(childPipeOUT[1], (char*) &buffer, BUFFER_LEN);
        wait(null);
        cout << "Parent: Children are done. Exiting..." << endl;
    }
    exit(0);
}