C++多線程實現(xiàn)TCP服務器端同時和多個客戶端通信

更新時間：2021年05月17日 09:11:50 作者：新西蘭做的飯

通訊建立后首先由服務器端發(fā)送消息，客戶端接收消息；接著客戶端發(fā)送消息，服務器端接收消息，實現(xiàn)交互發(fā)送消息。本文主要介紹了C++多線程實現(xiàn)TCP服務器端同時和多個客戶端通信，感興趣的可以了解一下

通訊建立后首先由服務器端發(fā)送消息，客戶端接收消息；接著客戶端發(fā)送消息，服務器端接收消息，實現(xiàn)交互發(fā)送消息。

服務器同時可以和多個客戶端建立連接，進行交互；

在某次交互中，服務器端或某客戶端有一方發(fā)送"end"即終止服務器與其的通信；服務器還可以繼續(xù)接收其他客戶端的請求，與其他客戶端通信。

服務器端

#include <WinSock2.h>
#include <WS2tcpip.h>
#include <iostream>
using namespace std;
#pragma comment(lib, "ws2_32.lib")
#define PORT 65432
DWORD WINAPI ThreadFun(LPVOID lpThreadParameter);
int main() 
{
	//初始化winsock2.DLL
	WSADATA wsaData;
	WORD wVersionRequested = MAKEWORD(2, 2);
	if (WSAStartup(wVersionRequested, &wsaData) != 0)
	{
		cout << "加載winsock.dll失??！" << endl;
		return 0;
	}
	//創(chuàng)建套接字
	SOCKET  sock_server;
	if ((sock_server = socket(AF_INET, SOCK_STREAM, 0)) == SOCKET_ERROR)
	{
		cout << "創(chuàng)建套接字失敗！錯誤代碼：" << WSAGetLastError() << endl;
		WSACleanup();
		return 0;
	}
	//綁定端口和Ip
	sockaddr_in addr;
	addr.sin_family = AF_INET;
	addr.sin_port = htons(PORT);
	inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);//綁定本機的環(huán)回地址
	if (SOCKET_ERROR == bind(sock_server, (SOCKADDR*)&addr, sizeof(sockaddr_in)))
	{
		cout << "地址綁定失??！錯誤代碼：" << WSAGetLastError() << endl;
		closesocket(sock_server);
		WSACleanup();
		return 0;
	}
	//將套接字設為監(jiān)聽狀態(tài)
	listen(sock_server, 0);
	
	//主線程循環(huán)接收客戶端的連接
	while (1) 
	{
		sockaddr_in addrClient;
		int len = sizeof(sockaddr_in);
		//接收成功返回與client通訊的socket
		SOCKET con = accept(sock_server, (SOCKADDR*)&addrClient, &len);
		if (con != INVALID_SOCKET) 
		{
			//創(chuàng)建線程 并且傳入與client通訊的套接字
			HANDLE hThread = CreateThread(NULL, 0, ThreadFun, (LPVOID)con, 0, NULL);
			CloseHandle(hThread); //關閉對線程的引用
		}
	}
	closesocket(sock_server);
	WSACleanup();
	return 0;
}
//線程通訊部分
DWORD WINAPI ThreadFun(LPVOID lpThreadParameter) 
{
	//與客戶端通訊 先發(fā)送再接收數(shù)據(jù)
	SOCKET sock = (SOCKET)lpThreadParameter;
	cout << "成功和" << sock << "建立連接！" << endl;
	while (1)
	{
		char msgbuffer[1000];//字符緩沖區(qū)
		printf("服務器向%d發(fā)送數(shù)據(jù)：\n", sock);
		cin.getline(msgbuffer, sizeof(msgbuffer));
		int size = send(sock, msgbuffer, sizeof(msgbuffer), 0);//給客戶端發(fā)送一段信息
		if (strcmp(msgbuffer, "end\0") == 0)
		{
			cout << "關閉和" << sock << "的連接！" << endl;
			return 0;
		}
		if (size == SOCKET_ERROR || size == 0)
		{
			cout << "發(fā)送信息失??！錯誤代碼：" << WSAGetLastError() << endl;
			return 0;
		}
		else cout << "信息發(fā)送成功！" << endl;
		
		//接收客戶端數(shù)據(jù)
		msgbuffer[999] = { 0 };
		int ret = recv(sock, msgbuffer, sizeof(msgbuffer), 0);
		if(ret == SOCKET_ERROR || ret == 0)
		{
			cout << sock << "斷開了連接！" << endl;
			break;
		}
		else cout << sock << "  說: " << msgbuffer << endl;
	}
	return 0;
}

客戶端

#include <winsock2.h>
#include <WS2tcpip.h>
#include <iostream>
using  namespace std;
#pragma comment(lib, "ws2_32.lib")
#define PORT 65432
int  main() 
{
	//初始化winsock2.DLL
	WSADATA wsaData;
	WORD wVersionRequested = MAKEWORD(2, 2);
	if (WSAStartup(wVersionRequested, &wsaData) != 0)
	{
		cout << "加載winsock.dll失敗！" << endl;
		return 0;
	}
	//創(chuàng)建套接字
	SOCKET  sock_client; 
	if ((sock_client = socket(AF_INET, SOCK_STREAM, 0)) == SOCKET_ERROR)
	{
		cout << "創(chuàng)建套接字失敗！錯誤代碼：" << WSAGetLastError() << endl;
		WSACleanup();
		return 0;
	}
	//連接服務器
	sockaddr_in   addr;
	addr.sin_family = AF_INET;
	addr.sin_port = htons(PORT);
	inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);//綁定本機的環(huán)回地址
	int len = sizeof(sockaddr_in);
	if (connect(sock_client, (SOCKADDR*)&addr, len) == SOCKET_ERROR) {
		cout << "連接失??！錯誤代碼：" << WSAGetLastError() << endl;
		return 0;
	}
	//實現(xiàn)交互部分，客戶端先接收后發(fā)送數(shù)據(jù)
	while (1)
	{
		//接收服務端的消息
		char msgbuffer[1000] = { 0 };
		int size = recv(sock_client, msgbuffer, sizeof(msgbuffer), 0);
		if (strcmp(msgbuffer, "end\0") == 0)
		{
			cout << "服務器端已經(jīng)關閉連接！" << endl;
			break;
		}
		if (size < 0)
		{
			cout << "接收信息失??！錯誤代碼：" << WSAGetLastError() << endl;
			break;
		}
		else if (size == 0)
		{
			cout << "對方已經(jīng)關閉連接" << endl;
			break;
		}
		else cout << "The message from Server:" << msgbuffer << endl;

		//從鍵盤輸入一行文字發(fā)送給服務器
		msgbuffer[999] =  0 ;
		cout << "從鍵盤輸入發(fā)給服務器的信息：" << endl;
		cin.getline(msgbuffer, sizeof(msgbuffer));
		if (strcmp(msgbuffer, "end\0") == 0)
		{
			cout << "關閉連接！" << endl;
			break;
		}
		int ret = send(sock_client, msgbuffer, sizeof(msgbuffer), 0);
		if (ret == SOCKET_ERROR || ret == 0)
		{
			cout << "發(fā)送信息失??！錯誤代碼：" << WSAGetLastError() << endl;
			break;
		}
		else cout << "信息發(fā)送成功！" << endl;
	}
	closesocket(sock_client);
	WSACleanup();
	return 0;
}