C++网络通信实例（TCP/IP协议，包括服务端与客户端通信）_c++通信协议编程

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TCP/IP是当下网络协议栈中的主流协议 TCP属于传输层的协议  可靠传输 包括经典的三次握手等等

IP协议是网络层协议 尽全力传输但不可靠 学过计算机网络的同学们对这个应该比较熟悉

以下是使用C++进行网络通信的实例 

服务端

主要使用多线程技术建立连接 也就是一个服务端可以连接多个客户端 最大连接数可以限定

向客户端发送字符串this is server 并启动一个线程等待客户端发送信息过来

如果客户端发送A过来 服务器返回B 发送C过来 服务器返回D 发送exit之后服务器关闭线程

效果图如下

代码如下

#include<iostream>
#include<stdlib.h>
#include<WinSock2.h>
#define _WINSOCK_DEPRECATED_NO_WARNINGS
 
using namespace std;
#pragma comment(lib, "ws2_32.lib")
DWORD WINAPI threadpro(LPVOID pParam) {
	SOCKET hsock = (SOCKET)pParam;
	char buffer[1024];
	char sendBuffer[1024];
	if (hsock != INVALID_SOCKET)
 
		cout << "start receive" << endl;
	while (1)
	{
		int num = recv(hsock, buffer, 1024, 0);
		if (num >= 0)
			cout << "receive from clinet" << buffer << endl;
		if (!strcmp(buffer, "A"))
		{
			memset(sendBuffer, 0, 1024);
			strcpy_s(sendBuffer, "B");
			int ires = send(hsock, sendBuffer, sizeof(sendBuffer), 0);//回送信息
			cout << "send to client" << sendBuffer << endl;
 
 
		}
		else if (!strcmp(buffer, "C"))
		{
			memset(sendBuffer, 0, 1024);
			strcpy_s(sendBuffer, "D");
			int ires = send(hsock, sendBuffer, sizeof(sendBuffer), 0);//回送信息
			cout << "send to client" << sendBuffer << endl;
 
		}
		else if (!strcmp(buffer, "exit"))
		{
 
			cout << "client close" << endl;
			cout << "server process close" << endl;
			return 0;
		}
		else
		{
			memset(sendBuffer, 0, 1024);
			strcpy_s(sendBuffer, "ERR");
			int ires = send(hsock, sendBuffer, sizeof(sendBuffer), 0);//回送信息
			cout << "send to client" << sendBuffer << endl;
 
 
		}
		 
	}
	return 0;
 
 
}
void main() {
	WSADATA wsd;
	WSAStartup(MAKEWORD(2, 2), &wsd);
	SOCKET m_SockServer;
	sockaddr_in serveraddr;
	sockaddr_in serveraddrfrom;
	SOCKET m_Server[20];
	serveraddr.sin_family = AF_INET;
	serveraddr.sin_port = htons(4600);//端口号
	//serveraddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
	m_SockServer = socket(AF_INET, SOCK_STREAM, 0);
	int i = bind(m_SockServer, (sockaddr*)&serveraddr, sizeof(serveraddr));//绑定数
	cout << "bind:" << i << endl;
	int imaxconnect = 20;
	int iconnect = 0;
	int ilisret;
	char buf[] = "this is server\0";
	char WarnBuf[] = "it is over max connect\0";
	int len = sizeof(sockaddr);
	while (1) {
		ilisret = listen(m_SockServer, 0);
		m_Server[iconnect] = accept(m_SockServer, (sockaddr*)&serveraddrfrom, &len);
		if (m_Server[iconnect] != INVALID_SOCKET)
		{
			int ires = send(m_Server[iconnect], buf, sizeof(buf), 0);
			cout << "accept:" << ires << endl;
			iconnect++;
			if (iconnect > imaxconnect)
			{
				int ires = send(m_Server[iconnect], WarnBuf, sizeof(WarnBuf), 0);
 
			}
			else
			{
				HANDLE m_handle;
				DWORD nThreadld = 0;
				m_handle = (HANDLE)::CreateThread(NULL, 0, threadpro, (LPVOID)m_Server[--iconnect], 0, &nThreadld);//启动 线程
 
 
 
			}
 
 
 
 
		}
 
 
		WSACleanup();
	}
 
}

客户端

#include<iostream>
#include<stdlib.h>
#include"winsock2.h"
#include<time.h>
#define _WINSOCK_DEPRECATED_NO_WARNINGS
using namespace std;
#pragma comment(lib,"ws2_32.lib")
void main() {
	WSADATA wsd;
	WSAStartup(MAKEWORD(2, 2), &wsd);
	SOCKET m_SockClient;
	sockaddr_in clientaddr;
	clientaddr.sin_family = AF_INET;
	clientaddr.sin_port = htons(4600);
	//clientaddr.sin_addr.S_un.S_addr =inet_addr("127.0.0.1");
	m_SockClient = socket(AF_INET, SOCK_STREAM, 0);
	int i = connect(m_SockClient, (sockaddr*)&clientaddr, sizeof(clientaddr));
	cout << "connect" << i << endl;
	char buffer[1024];
	char inBuf[1024];
	int num;
	num = recv(m_SockClient, buffer, 1024, 0);
	if (num > 0) {
		cout << "receive from server" << buffer << endl;
		while (1) {
			num = 0;
			cin >> inBuf;
			if (!strcmp(inBuf, "exit")) {
 
				send(m_SockClient, inBuf, sizeof(inBuf), 0);
				return;
 
			}
			send(m_SockClient, inBuf, sizeof(inBuf), 0);
			num = recv(m_SockClient, buffer, 1024, 0);
			if (num >= 0)
				cout << "reveive from server" << buffer << endl;
 
 
 
 
 
		}
 
 
 
 
 
 
 
 
	}
 
 
 
 
 
 
 
 
}

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