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C++基於TCP/IP簡單的客戶端、伺服器通訊程式例項

本篇文章實現了一個基於TCP 的一個非常簡單的客戶/伺服器通訊程式例項。該程式中通訊協議使用的是面向連線的TCP協議SOCK_STREAM, 伺服器的ip地址為本地地址即:
127.0.0.1,埠號為自定義的5099(大於1024即可),服務端的功能只要有客戶端連線請求,服務端就接受連線,在連線成功後向客戶端傳送資料,並且接受客戶端傳送的
資料。客戶端在向服務端發出請求後接受並顯示服務端的資料,並且給服務端也傳送資料。

以下程式碼是服務端程式程式碼:

[cpp] view plain copy
#include <WinSock2.h>  
#include <stdio.h>  
#include <stdlib.h> #pragma comment(lib, "ws2_32.lib") void main() { WSADATA wsaData; int port = 5099; char buf[] = "Server: hello, I am a server....."; if(WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) { printf("Failed to load Winsock"); return
; } //建立用於監聽的套接字 SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0); SOCKADDR_IN addrSrv; addrSrv.sin_family = AF_INET; addrSrv.sin_port = htons(port); //1024以上的埠號 addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY); int retVal = bind(sockSrv, (LPSOCKADDR)&addrSrv, sizeof
(SOCKADDR_IN)); if(retVal == SOCKET_ERROR){ printf("Failed bind:%d\n", WSAGetLastError()); return; } if(listen(sockSrv,10) ==SOCKET_ERROR){ printf("Listen failed:%d", WSAGetLastError()); return; } SOCKADDR_IN addrClient; int len = sizeof(SOCKADDR); while(1) { //等待客戶請求到來 SOCKET sockConn = accept(sockSrv, (SOCKADDR *) &addrClient, &len); if(sockConn == SOCKET_ERROR){ printf("Accept failed:%d", WSAGetLastError()); break; } printf("Accept client IP:[%s]\n", inet_ntoa(addrClient.sin_addr)); //傳送資料 int iSend = send(sockConn, buf, sizeof(buf) , 0); if(iSend == SOCKET_ERROR){ printf("send failed"); break; } char recvBuf[100]; memset(recvBuf, 0, sizeof(recvBuf)); // //接收資料 recv(sockConn, recvBuf, sizeof(recvBuf), 0); printf("%s\n", recvBuf); closesocket(sockConn); } closesocket(sockSrv); WSACleanup(); system("pause"); }

客戶端

#include <WinSock2.h>  
#include <stdio.h>  

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

void main()  
{  
    //載入套接字  
    WSADATA wsaData;  
    char buff[1024];  
    memset(buff, 0, sizeof(buff));  

    if(WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)  
    {  
        printf("Failed to load Winsock");  
        return;  
    }  

    SOCKADDR_IN addrSrv;  
    addrSrv.sin_family = AF_INET;  
    addrSrv.sin_port = htons(5099);  
    addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");  

    //建立套接字  
    SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0);  
    if(SOCKET_ERROR == sockClient){  
        printf("Socket() error:%d", WSAGetLastError());  
        return;  
    }  

    //向伺服器發出連線請求  
    if(connect(sockClient, (struct  sockaddr*)&addrSrv, sizeof(addrSrv)) == INVALID_SOCKET){  
        printf("Connect failed:%d", WSAGetLastError());  
        return;  
    }else  
    {  
        //接收資料  
        recv(sockClient, buff, sizeof(buff), 0);  
        printf("%s\n", buff);  
    }  

    //傳送資料  
    char buff = "hello, this is a Client....";  
    send(sockClient, buff, sizeof(buff), 0);  

    //關閉套接字  
    closesocket(sockClient);  
    WSACleanup();  
}