C语言 在c中通过tcp套接字发送结构
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send struct over tcp socket in c
提问by user1550036
I've got a struct:
我有一个结构：
typedef struct {
char *typ;
cid_t cid;
unsigned short nbytes;
char *data;
} req_s;
typedef struct {
char *ip;
unsigned short pid;
} cid_t;
and I want to send it over a tcp socket. Is that possible? I've done it with:
我想通过 tcp 套接字发送它。那可能吗？我已经做到了：
req_s answer;
...
if( send(sock, (void*)&answer, sizeof(answer),0) < 0 ) {
printf("send failed!\n");
}
...
recv ( socketDesc, (void*)&answer, sizeof(answer), 0) >= 0)
but if I want to read rout my struct answer I only get some hieroglyphs
但是如果我想阅读我的结构答案，我只会得到一些象形文字
or is there even a better way to send my data from client to server and back?
或者有没有更好的方法将我的数据从客户端发送到服务器并返回？
采纳答案by user1550036
See here: Passing a structure through Sockets in C. However, in your case, you additionally have pointers insideyour structure, so you will have to write contentsof those pointers to the destination buffer, too.
请参阅此处：通过 C 中的 Sockets 传递结构。然而，在你的情况，你还具有指针里面的结构，所以你必须写内容的指针指向目标缓冲区的了。
回答by Xavier Leclercq
Sending pointers over a network connection is usually not going to work as the data they point to will not be copied across and even if it were it would probably reside at a different memory address. You need to serialize your structs to send them over a network connection.
通过网络连接发送指针通常不会起作用，因为它们指向的数据不会被复制，即使它可能会驻留在不同的内存地址。您需要序列化您的结构以通过网络连接发送它们。
