实现简单的TCP服务端和客户端1

服务端代码

#define WIN32_LEAN_AND_MEAN
#include <winsock2.h>
#include <windows.h>
#include <stdlib.h> 
#include <stdio.h>


//#pragma comment (lib, "ws2_32.lib")  //加载 ws2_32.dll

using namespace std;
void main()
{
	int nRet;
    WSADATA wsaData;
	WSAStartup( MAKEWORD(2, 2), &wsaData);  //Windos 使用socket要有这一句
    printf("Hello Socket\n");
	
	SOCKET servSock = socket( AF_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(1555);  //端口
     bind(servSock, (SOCKADDR*)&sockAddr, sizeof(SOCKADDR));
 
     //进入监听状态
     listen(servSock, 20);
	 
	 SOCKET clntSock;
	 while(1)
	 {
		  //接收客户端请求
       SOCKADDR clntAddr;
	   //timeval timeout={0,0};

	   //nRet = select(maxfdp, &readfds, &writefds, &errorfds, &timeout);
       int nSize = sizeof(SOCKADDR);
        clntSock = accept(servSock, (SOCKADDR*)&clntAddr, &nSize);
       printf("打开客户端socket。。。\n");
       //向客户端发送数据
       char *str = "Hello World!";
       send(clntSock, str, strlen(str)+sizeof(char), NULL); 
	 
	 }

 
     //关闭套接字
     closesocket(clntSock);
     closesocket(servSock);
     //system("pause");

	 WSACleanup();//Windos 使用socket要有这一句
    
}

 

 

 

客户端代码

 

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

/*客户端代码*/

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(1555);
    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);

    //关闭套接字
    closesocket(sock);

    //终止使用 DLL
    WSACleanup();

    system("pause");
    return 0;
}