[C++知识库]2021-09-01 C语言基础网络编程学习记录

下面展示一些 内联代码片。

（2021.9.1学习记录）用C语言搭建一个简易的交换数据服务器

服务端

///
///服务端//
///

#include<stdio.h>
#include<WinSock2.h>
//1.加载驱动库
#pragma comment(lib,"ws2_32.lib")//加载ws2_32.dll

void main()
{
	//2.初始化 DLL
	WSADATA wsaData;
	WSAStartup(MAKEWORD(2, 2), &wsaData);

	//3.创建套接字
	SOCKET servSock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

	//4.设置服务器端基本信息
	SOCKADDR_IN saddr;
	saddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);//IP地址
	saddr.sin_family = AF_INET;//协议类型
	saddr.sin_port = htons(8080);//端口号

	//5.绑定在本地端口
	bind(servSock, (SOCKADDR *)&saddr, sizeof(SOCKADDR));
	printf("等待客户端连接...\n");

	//6.监听端口
	listen(servSock, 20);

	
		//7.循环监听（阻塞式）
		int len = sizeof(SOCKADDR);



		//8.等待客户端链接
		SOCKADDR_IN caddr;
		SOCKET clntSock = accept(servSock, (SOCKADDR*)&caddr, &len);
		printf("客户端连接成功！\n");
	while (true) {

		//9.接收客户端消息
		char recvBuf[1000] = "";
		recv(clntSock, recvBuf, 1000, 0);
		printf("客户端发送的消息内容:%s\n", recvBuf);

		//10.服务器端向客户端发送信息
		/*char sendBuf[1000] = "";
		sprintf_s(sendBuf, "服务器已接收你的消息！");
		send(clntSock, sendBuf, strlen(sendBuf) + 1, 0);*/

		char sen[1000] = "";
		printf("请输入要向客户端发送的信息:");
		gets_s(sen);
		send(clntSock, sen, strlen(sen) + 1, 0);

	}

	//11.关闭服务器
	closesocket(clntSock);
	closesocket(servSock);

	//12.退出服务器
	WSACleanup();


}

*客户端

///
///客户端//
///


#include<stdio.h>
#include<winsock2.h>

#pragma comment(lib,"ws2_32.lib")

void main()
{
	WSADATA wsaData;
	WSAStartup(MAKEWORD(2, 2), &wsaData);

	SOCKET clientSock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

	SOCKADDR_IN saddr;
	saddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
	saddr.sin_family = AF_INET;
	saddr.sin_port = htons(8080);

	bool i=connect(clientSock, (SOCKADDR *)&saddr,sizeof(SOCKADDR));
	if (i == 0)
		printf("服务端连接成功！\n");
	else
	{
		printf("服务端连接失败,请重新尝试\n");
		return;
	}
	while(true){
	/*char sendBuf[1000] = "";
	sprintf_s(sendBuf, "你好，我是客户端");
	send(clientSock, sendBuf, strlen(sendBuf) + 1, 0);*/

	char sen[1000] = "";
	printf("请输入要向服务端发送的信息:");
	gets_s(sen);
	send(clientSock, sen, strlen(sen) + 1, 0);
	

	char recvBuf[1000] = "";
	recv(clientSock, recvBuf, 1000, 0);
	printf("服务端发送的消息内容:%s\n", recvBuf);
	}
	
	closesocket(clientSock);

	WSACleanup();



}