C++ Windows Socket 编程

传送门：代码转自

Server

#include <stdio.h>  
#include <winsock2.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  
    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;
    sockaddr_in remoteAddr;
    int nAddrlen = sizeof(remoteAddr);
    char revData[255];
    while (true)
    {  
        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); 
        if(ret > 0)  
        { 
            revData[ret] = 0x00;  
            printf(revData); 
        }  
  
        //发送数据  
        const char * sendData = "你好，TCP客户端！\n";  
        send(sClient, sendData, strlen(sendData), 0);  
        closesocket(sClient);  
    }  
      
    closesocket(slisten);  
    WSACleanup();  
    return 0;  
} 

Client

#include<WINSOCK2.H>
#include<STDIO.H>
#include<iostream>
#include<cstring>
using namespace std;
#pragma comment(lib, "ws2_32.lib")
 
int main()
{
	WORD sockVersion = MAKEWORD(2, 2);
	WSADATA data;
	if(WSAStartup(sockVersion, &data)!=0)
	{
		return 0;
	}
	while(true){
		SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
		if(sclient == INVALID_SOCKET)
		{
			printf("invalid socket!");
			return 0;
		}
		
		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, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
		{  //连接失败 
			printf("connect error !");
			closesocket(sclient);
			return 0;
		}
		
		string data;
		cin>>data;
		const char * sendData;
		sendData = data.c_str();   //string转const char* 
		//char * sendData = "你好，TCP服务端，我是客户端\n";
		send(sclient, sendData, strlen(sendData), 0);
		//send()用来将数据由指定的socket传给对方主机
		//int send(int s, const void * msg, int len, unsigned int flags)
		//s为已建立好连接的socket，msg指向数据内容，len则为数据长度，参数flags一般设0
		//成功则返回实际传送出去的字符数，失败返回-1，错误原因存于error 
		
		char recData[255];
		int ret = recv(sclient, recData, 255, 0);
		if(ret>0){
			recData[ret] = 0x00;
			printf(recData);
		} 
		closesocket(sclient);
	}
	
	
	WSACleanup();
	return 0;
	
}