在派则mq_se​​nd结构 [英] send struct in mq_send

问题描述

我使用POSIX IPC，并根据文件 - <一个href=\"http://man7.org/linux/man-pages/man3/mq_send.3.html\">http://man7.org/linux/man-pages/man3/mq_send.3.html

I am using POSIX IPC and according to the documentation - http://man7.org/linux/man-pages/man3/mq_send.3.html

则mq_se​​nd（）方法只发送字符*数据和mq_recv（）临危只有字符数据。
不过，我想自定义的结构发到我的味精队列，在接收端，我想获得的结构。

mq_send() method only sends char* data and mq_recv() recieves only character data. However, I want to send a custom struct to my msg queue and on the receiving end, I want to get the struct.

样的结构：

struc Req
{
  pid_t pid;
  char data[4096];
}

所以，没有人知道如何在C浪做到这一点？

So, does anyone know how to accomplish this in C lang?

推荐答案

您只需要通过结构的地址，并将它转换为相应的指针类型：为const char *为则mq_se​​nd 和char *为则mq_receive 。

You just need to pass the address of the struct and cast it to the appropriate pointer type: const char * for mq_send and char * for mq_receive.

typedef struct Req
{
  pid_t pid;
  char data[4096];
} Req;

Req buf;

n = mq_receive(mqdes0, (char *) &buf, sizeof(buf), NULL);

mq_send(mqdes1, (const char *) &buf, sizeof(buf), 0);

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