windows网络编程（一）

客户端

#include <stdio.h>
#include <stdlib.h>
#include <WinSock2.h>
#pragma comment(lib, "ws2_32.lib")  //加载 ws2_32.dll
int main(){
	//初始化DLL
	WSADATA wsaData;
	WSAStartup(MAKEWORD(2, 2), &wsaData);
	//创建套接字
	SOCKET 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));
	//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);

	char test[20] = "我收到了！";
	send(sock, test, strlen(test)+sizeof(char), NULL);

	recv(sock, szBuffer, MAXBYTE, NULL);
	printf("Message form server: %s\n", szBuffer);

	//关闭套接字
	closesocket(sock);
	//终止使用 DLL
	WSACleanup();
	system("pause");
	return 0;
}

服务器端

#include <stdio.h>
#include <winsock2.h>
#pragma comment (lib, "ws2_32.lib")  //加载 ws2_32.dll
int main(){
	//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;
	int nSize = sizeof(SOCKADDR);
	SOCKET clntSock;
	while (1)
	{

		 clntSock = accept(servSock, (SOCKADDR*)&clntAddr, &nSize);
		//向客户端发送数据
		char *str = "不要放弃，加油啊！！！！";
		send(clntSock, str, strlen(str) + sizeof(char), NULL);

		char szBuffer[MAXBYTE] = { 0 };
		recv(clntSock, szBuffer, MAXBYTE, NULL);

		send(clntSock, szBuffer, strlen(szBuffer) + sizeof(char), NULL);

		printf("%s", szBuffer);
		closesocket(clntSock);//置于内部
	}
	//关闭套接字
	
	closesocket(servSock);
	//终止 DLL 的使用
	WSACleanup();
	system("pause");
	return 0;
}