Socket编程中如何发送结构体，拼接多次接收消息及获取通信双方地址

客户端：

[html]
view plain
copy

#include <iostream>
#include <stdio.h>
#include <string>
#include "winsock.h"
#pragma comment(lib, "wsock32")

using namespace std;

#define COMMAND 100

int main()
{
int ret = 0;

WSADATA wsadata;
WORD version = MAKEWORD(2,0);
ret = WSAStartup(version,&wsadata);

SOCKET m_hClientSocket;
m_hClientSocket = socket(AF_INET,SOCK_STREAM,0);

SOCKADDR_IN m_addr1;
m_addr1.sin_family = AF_INET;
m_addr1.sin_addr.S_un.S_addr = inet_addr("192.168.100.57");
m_addr1.sin_port = htons(10000);
ret = connect(m_hClientSocket,(LPSOCKADDR)&m_addr1,sizeof(m_addr1));

char Clisend_msg[] = "我是客户端，请问你是那位？";
//char Clisend_msg[] = "hello, I am a client, and who are you?";
int len_send = send(m_hClientSocket,Clisend_msg,sizeof(Clisend_msg),0);

//利用字符串发送，规定好字符串格式在服务器端接收后进行解析
/*char send_buf[1024] = "tony 2000 ";
int len_send = send(m_hClientSocket,send_buf,sizeof(send_buf),0);*/

//使用结构体转换成字符串发送，在服务器端直接转为结构体
/*
char send_buf[1024] = "tony 2000 ";
memset(send_buf,0,1024);
struct msg
{
int cmd;
int sendID;
int recvID;
string name;
int number;
};
msg msg1;
msg1.cmd = COMMAND;
msg1.sendID = 2120100324;
msg1.recvID = 2120100325;
msg1.name = "Tony";
msg1.number = 2000;

//以字符串形式发送，因为TCP/IP是字节流通信
//memcpy(send_buf,&msg1,sizeof(msg));
//int len_send = send(m_hClientSocket,send_buf,sizeof(send_buf),0);
int len_send = send(m_hClientSocket,(char *)&msg1,sizeof(msg),0);
*/

closesocket(m_hClientSocket);
WSACleanup();

return 0;
}

服务器端代码：

[html]
view plain
copy

#include <iostream>
#include <stdio.h>
#include <string>
#include "winsock.h"
#pragma comment(lib, "wsock32")

using namespace std;

int main()
{
//创建socket编程环境
int ret = 0;
WSADATA wsadata;
WORD version = MAKEWORD(2,0);
ret = WSAStartup(version,&wsadata);

//服务器端口创建
SOCKET m_hServerSocket;
m_hServerSocket = socket(AF_INET,SOCK_STREAM,0);
if(INVALID_SOCKET == m_hServerSocket)
{
cout << "服务器socket创建失败！" << endl;
return 0;
}
else
{
cout << "服务器socket创建成功" << endl;
}
cout << endl;

//服务器端口绑定
SOCKADDR_IN m_addr;
m_addr.sin_family = AF_INET;
m_addr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
m_addr.sin_port = htons(10000);
ret = bind(m_hServerSocket,(LPSOCKADDR)&m_addr,sizeof(m_addr));

//服务器端口开始监听
ret = listen(m_hServerSocket,20);//第二个参数指定最大申请的连接数

//每当有一个客户端连接申请，则服务器端创建一个线程对其进行处理,模拟数据库服务器的处理方式
SOCKET com_Sock;
SOCKADDR_IN clntaddr;
int clnlen = sizeof(clntaddr);
struct msg
{
int cmd;
int sendID;
int recvID;
string name;
int number;
};
msg msg2;

while(1)
{
int count = 0;
//com_Sock = accept(m_hServerSocket,NULL,NULL);
com_Sock = accept(m_hServerSocket,(SOCKADDR *)&clntaddr,&clnlen);
/*cout << inet_ntoa(clntaddr.sin_addr) << endl;

getpeername(com_Sock,(SOCKADDR *)&clntaddr,&clnlen);
cout << inet_ntoa(clntaddr.sin_addr) << endl;*/
getsockname(com_Sock,(SOCKADDR *)&clntaddr,&clnlen);
cout << inet_ntoa(clntaddr.sin_addr) << endl;

char recv_msg[16];
memset(recv_msg,0,16);
ret = recv(com_Sock,recv_msg,sizeof(recv_msg),0);
cout << ret << endl;

//根据给定的字符串格式进行解析
/*
for (int i=0;i<4;i++)
{
cout << recv_msg[i];
}
cout << endl;
for (int j=6; j<10; j++)
{
cout << recv_msg[j];
}
cout << endl;*/

//直接将接收到的字节流拷贝给相应的结构体即可。
/*
memset(&msg2,0,sizeof(msg));
memcpy(&msg2,recv_msg,sizeof(msg));
cout << msg2.cmd << endl;
cout << msg2.sendID << endl;
cout << msg2.recvID << endl;
cout << msg2.name << endl;
cout << msg2.number << endl;
*/

//在服务器端把多次接收的信息拼接到一起
char receive[1000];
memset(receive,0,sizeof(receive));
int k = 0;

while (ret > 0)
{
for (int m=0; m<16; m++)
{
receive[k] = recv_msg[m];
k++;
}

cout << ret << endl;
count += ret;
//这里必须加上字符串结束标识，否则会乱码，虽然这已经不是这个
//数组的单元了。由字符串性质决定的。虽然接受字符串末尾的结束标识，但是如果分多次接收的时候就不行了 recv_msg[ret] = '\0';
cout << recv_msg << endl;
ret = recv(com_Sock,recv_msg,sizeof(recv_msg),0);
}
cout << count << endl;

cout << receive << endl;
cout << strlen(receive) << endl;

closesocket(com_Sock);
}

WSACleanup();

return 0;
}

转载自：http://blog.csdn.net/gukesdo/article/details/7277146