IPC消息队列如何发送对的向量 [英] IPC message queues how to send a vector of pairs
问题描述
我尝试在两个进程之间发送和接收消息
结构如下
I'm trying to send and receive a message between 2 processes the struct as follows
struct _st{
long _var1;
int _var2;
int _var3;
int _var4;
int _var5;
vector <pair<int,int> > _var6;
};
,我的发送代码为
send_val = msgsnd(msgqid, &message, sizeof(message), !IPC_NOWAIT);
我这样收到
rec_val = msgrcv(msgqid, &message, sizeof(message), 0, !IPC_NOWAIT);
当我将我的_var6从接收到的消息分配给另一个变量并打印它的值
i get垃圾。
when i assign my _var6 from the received message to another variable and print it's values i get garbage.
如何正确地发送和接收此结构?
How can i send and receive this struct correctly?
推荐答案
_st
不是POD序列化/反序列化它。你实际上发送_var6内部指针超过IPC不是它的内容。
_st
is not POD you cant' simply send over IPC without serialize/deserialize it. You are actually sending _var6 internal pointer over IPC not its content.
sizeof(message)
code> _st struct size,它不包括 _var6
的内容大小。
您需要在msgsnd之前手动序列化 _st
,并在msgrcv之后对其进行反序列化。
sizeof(message)
will only get static _st
struct size, it doesn't include contents size of _var6
.
You need to serialize _st
manually before msgsnd and deserialize it after msgrcv.
http://www.boost.org/doc/libs /1_52_0/libs/serialization/doc/index.html
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