c++socket代码

开发环境：

window7

VisualStudio2015

服务端代码：server.cpp

#include <stdio.h>
#include <winsock2.h>
#pragma comment (lib, "ws2_32.lib")  //加载 ws2_32.dll

#include <iostream>
using namespace std;

//线程
#include <cstdlib>
#include <windows.h>

//声明
DWORD WINAPI Fun1Proc(LPVOID lpParameter);

int main(){
	printf("start server\n");

	/*** 可参考文档 http://c.biancheng.net/cpp/html/3031.html **/
	//初始化 DLL
	WSADATA wsaData;
	WSAStartup(MAKEWORD(2, 2), &wsaData);
	//创建套接字
	SOCKET servSock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
	//绑定套接字
	sockaddr_in sockAddr;
	memset(&sockAddr, 0, sizeof(sockAddr));  //每个字节都用0填充
	sockAddr.sin_family = PF_INET;  //使用IPv4地址
	sockAddr.sin_addr.s_addr = inet_addr("127.0.0.1");  //具体的IP地址
	sockAddr.sin_port = htons(1234);  //端口
	bind(servSock, (SOCKADDR*)&sockAddr, sizeof(SOCKADDR));
	//进入监听状态
	listen(servSock, 20);
	//接收客户端请求
	//SOCKADDR clntAddr;
	SOCKADDR_IN clntAddr;

	int nSize = sizeof(SOCKADDR);
	while (true)
	{
		SOCKET clntSock = accept(servSock, (SOCKADDR*)&clntAddr, &nSize);
		//告诉用户谁上线
		char szIpAddress[16];
		strcpy_s(szIpAddress, sizeof(szIpAddress), inet_ntoa(clntAddr.sin_addr));
		//cout << szIpAddress << "上线了" << endl;

		HANDLE hThread_1 = CreateThread(NULL, 0, Fun1Proc, (LPVOID)&clntSock, 0, NULL);
		CloseHandle(hThread_1);
	}
	
	closesocket(servSock);
	//终止 DLL 的使用
	WSACleanup();
	printf("end server\n");
	system("pause");
	return 0;
}


DWORD WINAPI Fun1Proc(LPVOID lpParameter )
{
	SOCKET clntSock = *(SOCKET*)lpParameter;
	

	//接收服务器传回的数据
	char szBuffer[MAXBYTE] = { 0 };
	recv(clntSock, szBuffer, MAXBYTE, NULL);
	//输出接收到的数据
	//printf("Message form client: %s\n", szBuffer);
	cout << "Message form client: " << szBuffer << endl;

	//strcat(szBuffer, "发送出去");
	//向客户端发送数据
	char *str = szBuffer;
	send(clntSock, str, strlen(str) + sizeof(char), NULL);
	//关闭套接字
	//closesocket(clntSock);
	return 0;
}

客户端代码：client.cpp

#include <stdio.h>
#include <stdlib.h>
#include <WinSock2.h>
#pragma comment(lib, "ws2_32.lib")  //加载 ws2_32.dll

#include <iostream>
using namespace std;


int main() {
	//初始化DLL


	WSADATA wsaData;
	WSAStartup(MAKEWORD(2, 2), &wsaData);
	SOCKET sock = NULL;
	while (true)
	{
		//创建套接字
		sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
		//向服务器发起请求
		sockaddr_in sockAddr;
		memset(&sockAddr, 0, sizeof(sockAddr));  //每个字节都用0填充
		sockAddr.sin_family = PF_INET;
		sockAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
		sockAddr.sin_port = htons(1234);
	
		connect(sock, (SOCKADDR*)&sockAddr, sizeof(SOCKADDR));
		 
		cout << "Please input :" ;
		char sendString[500];
		cin >> sendString ;
		 
		strcat(sendString, "\n");
		//向服务端端发送数据
		char *sendStr = sendString;
		send(sock, sendStr, strlen(sendStr) + sizeof(char), NULL);

		cout << sendString << endl;

		//接收服务器传回的数据
		char szBuffer[MAXBYTE] = { 0 };
		recv(sock, szBuffer, MAXBYTE, NULL);
		//输出接收到的数据
		//	printf("Message form server: %s\n", szBuffer);
		cout << "Message form server:" << szBuffer << endl;
		//关闭套接字
		closesocket(sock);
	}
	
	//终止使用 DLL
	WSACleanup();
	system("pause");
	return 0;
}

源代码下载地址：http://download.csdn.net/detail/baidu_19473529/9748318

写的不好的地方，万忘指正。