多线程socket通信server

最新推荐文章于 2022-01-04 12:40:04 发布

原创最新推荐文章于 2022-01-04 12:40:04 发布 · 3.1k 阅读

2 ·

CC 4.0 BY-SA版权

文章标签：

#socket #多线程 #function #stream #server #服务器

win c/c++ 专栏收录该内容

15 篇文章

订阅专栏

本文介绍了如何使用多线程实现一个Socket服务器，详细阐述了客户端连接建立的过程，并提到了所需的库文件ws2_32.lib。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

控制台下实现多线程socket通信，服务端为每个请求的客户端创建一个线程，进行通信。其实这些MSDN里都有。

一.基本流程如下：
定义变量->获得winsock版本->加载winsock库->初始化->创建套接字->设置套接字选项->关闭套接字->卸载winsock库->释放资源

二.客户端建立过程(上篇是客户端)

服务器

1 初始化WSA
2 建立一个SOCKET
3 绑定SOCKET
4 在指定的端口监听
5 接受一个连接
6 发送和接受数据
7 断开连接

三.注意winsock下编程有用到两个库
Winsock2.h

ws2_32.lib

#include <Winsock2.h>
#include <stdio.h>
#include <process.h>

#pragma comment(lib,"ws2_32.lib")
 
unsigned __stdcall ExecuteThread(void* lparam) 
{ 
	SOCKET ClientSocket=(SOCKET)(void*)lparam; 

	char sendText[]="make a connection!\r\n"; 
	send(ClientSocket, sendText, strlen(sendText)+1, 0 );

	char recvText[100] = {0};
	if (recv(ClientSocket, recvText, 100, 0) != SOCKET_ERROR)
	{
		printf("receive text: %s\n", recvText);
	}	

	_endthreadex(0);
	return 0; 
} 

int main(int argc, char* argv[])
{
	// (1)加载套接字库
	WORD wVersionRequested;			//WinSock库的版本号
	WSADATA wsaData;
	int iResult = 0;

	wVersionRequested = MAKEWORD(1, 1);
	iResult = WSAStartup(wVersionRequested, &wsaData);
	if( iResult != NO_ERROR)
	{
		printf("WSAStartup() failed with error: %d\n", iResult);
		return -1 ;
	}

	if( LOBYTE( wsaData.wVersion) != 1 || HIBYTE( wsaData.wVersion) !=1 )
	{
		WSACleanup();
		return -1;
	}
	// (2)创建用于监听的套接字
	SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0);
	if (sockSrv == INVALID_SOCKET) 
	{
		printf("socket function failed with error: %ld\n", WSAGetLastError());
		WSACleanup();
		return -1;
	}

	SOCKADDR_IN addrSrv;
	addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
	addrSrv.sin_family = AF_INET;
	addrSrv.sin_port = htons(51555);

	// (3)绑定套接字
	iResult = bind(sockSrv, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR));
	if (iResult == SOCKET_ERROR) 
	{
		printf("bind function failed with error %d\n", WSAGetLastError());

		iResult = closesocket(sockSrv);
		if (iResult == SOCKET_ERROR)
		{
			printf("closesocket function failed with error %d\n", WSAGetLastError());
		}

		WSACleanup();
		return -1;
	}

	// (4)将套接字设为监听模式，准备接受客户请求
	iResult = listen(sockSrv, SOMAXCONN);
	if (iResult == SOCKET_ERROR)
	{
		printf("listen function failed with error: %d\n", WSAGetLastError());
	}
	 
	 printf("Listening on socket...\n");

	// (5)创建线程等待客户请求
	SOCKADDR_IN addrClient;
	int len = sizeof(SOCKADDR);
	
	SOCKET sockConn;
	unsigned dwThreadId; 
	HANDLE hThread; 

	while(1)
	{
		//等待客户请求
		sockConn = accept(sockSrv, (SOCKADDR*)&addrClient, &len);
		if (sockConn == INVALID_SOCKET )
		{
			printf("accept function failed with error: %d\n", WSAGetLastError());
		}

		// _beginthreadx比createthread更安全
		hThread = (HANDLE)_beginthreadex(NULL, 0, &ExecuteThread, (void*)sockConn, 0, &dwThreadId );

		WaitForSingleObject(hThread, INFINITE );
	}
	
	// (6)结束处理
	CloseHandle(hThread);

	iResult = closesocket(sockConn);
	if (iResult == SOCKET_ERROR) 
	{
		printf("closesocket function failed with error %d\n", WSAGetLastError());
		WSACleanup();
		return -1;
	}

	WSACleanup();

	return 0;
}