windows 下C语言socket编程

爱被打了一巴掌 2022-01-29 12:57 324阅读 0赞

之前一直在Linux系统开发C语言的socket，由于项目的需要  需要在windows下开发，第一次在windows下开

发，顺便记录下来。

首先socket的通信流程：

Server程序：

1 .创建socket:socket();

2. 绑定socket的IP+端口号：bind();

3.监听端口号：listen();

4.接收客户端的连接请求：accept();

5.读写客户端：recv(),send();

6.关闭socket；close();

Client程序：

1.创建socket：socket();

2.连接指定计算的端口：connect();

3.发送或者手服务器的数据：send(),recv();

4.关闭socket：close();

socket是基于TCP/IP通信协议的，下图为三次握手：

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服务器端代码：

#include <stdlib.h>
    #include <stdio.h>
    #include <winsock2.h>
    #include <windows.h>
    #pragma comment(lib,"ws2_32.lib")
     
    int main(int argc, char* argv[])
    {
    	//初始化WSA
    	WORD sockVersion = MAKEWORD(2, 2);
    	WSADATA wsaData;
    	if (WSAStartup(sockVersion, &wsaData) != 0)
    	{
    		return 0;
    	}
     
    	//创建套接字
    	SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    	if (slisten == INVALID_SOCKET)
    	{
    		printf("socket error !");
    		return 0;
    	}
     
    	//绑定IP和端口
    	struct sockaddr_in sin;
    	sin.sin_family = AF_INET;
    	sin.sin_port = htons(8888);
    	sin.sin_addr.S_un.S_addr = INADDR_ANY;
    	if (bind(slisten, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)
    	{
    		printf("bind error !");
    	}
     
    	//开始监听
    	if (listen(slisten, 5) == SOCKET_ERROR)
    	{
    		printf("listen error !");
    		return 0;
    	}
     
    	//循环接收数据
    	SOCKET sClient;
    	struct sockaddr_in remoteAddr;
    	int nAddrlen = sizeof(remoteAddr);
    	//char revData[255];
    	printf("等待连接...\n");
    	sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen);
    	while (1)
    	{
    		char revData[255];
    		//printf("等待连接...\n");
    		//sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen);
    		if (sClient == INVALID_SOCKET)
    		{
    			printf("accept error !");
    			continue;
    		}
    		printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));
     
    		//接收数据
    		int ret = recv(sClient, revData, 255, 0);
    		//printf(ret);
    		if (ret > 0)
    		{
    			revData[ret] = 0x00;
    			printf(revData);
    		}
    		//发送数据
    		char * sendData = "你好，TCP客户端！\n";
    		send(sClient, sendData, strlen(sendData), 0);
    	}
    		closesocket(sClient);
    	closesocket(slisten);
    	WSACleanup();
    	return 0;
    }

客户端代码：

#include <stdio.h>
    #include <stdlib.h>
    #include <winsock2.h>
    #include <windows.h>
    #pragma comment(lib,"ws2_32.lib")
    #include <STDIO.H>
    int main(int argc, char* argv[])
    {
    	WORD sockVersion = MAKEWORD(2, 2);
    	WSADATA data;
    	if (WSAStartup(sockVersion, &data) != 0)
    	{
    		return 0;
    	}
     
    	SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    	if (sclient == INVALID_SOCKET)
    	{
    		printf("invalid socket !");
    		return 0;
    	}
     
    	struct sockaddr_in serAddr;
    	serAddr.sin_family = AF_INET;
    	serAddr.sin_port = htons(8888);
    	serAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
    	if (connect(sclient, (struct sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
    	{
    		printf("connect error !");
    		closesocket(sclient);
    		return 0;
    	}
    	for (int i = 0; i < 1000; i++)
    	{
     
    		char * sendData = "csi接收  二进制文件未解析\n";
    		send(sclient, sendData, strlen(sendData), 0);
    		char recData[255];
    		/*int ret = recv(sclient, recData, 255, 0);
    		if (ret > 0)
    		{
    	
    			recData[ret] = 0x00;
    			//printf(recData);
    			printf("%d%s",i,recData);
    		}
    		*/
    	}
    	closesocket(sclient);
    	WSACleanup();
    	return 0;
    }

提示：在DevC++中运行时需要在 工具--》编译选项--》

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