Windows Socket编程之HelloWorld

实现功能

客户端向服务端发送消息。服务端收到消息后，向客户端发送应答消息。客户端接收应答消息，并显示出来。

程序设计简图

 

代码实现

服务器端代码(操作系统XP 编译器VS2010)

main.cpp

#include <Windows.h>#include <iostream>#pragma comment(lib, "ws2_32.lib")bool StartUp(){//<此段代码源于MSDN>    WORD wVersionRequested;    WSADATA wsaData;    int err;//Use the MAKEWORD(lowbyte, highbyte) macro declared in Windef.h    wVersionRequested = MAKEWORD(2, 2);    err = WSAStartup(wVersionRequested, &wsaData);    if (err != 0) {        //Tell the user that we could not find a usable Winsock DLL.        printf("WSAStartup failed with error: %d\n", err);        return false;    }//Confirm that the WinSock DLL supports 2.2.//Note that if the DLL supports versions greater  //than 2.2 in addition to 2.2, it will still return //2.2 in wVersion since that is the version we requested.                                           if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {//Tell the user that we could not find a usable WinSock DLL.        printf("Could not find a usable version of Winsock.dll\n");        WSACleanup();        return false;    }    else        printf("The Winsock 2.2 dll was found okay\n");     //The Winsock DLL is acceptable. Proceed to use it//Add network programming using Winsock here //then call WSACleanup when done using the Winsock dll        //WSACleanup();//</此段代码源于MSDN>return true;}bool SetupServer();int main(){StartUp();SetupServer();WSACleanup();std::cin.get();return 0;}

test.cpp

#include <Windows.h>#include <iostream>#define DEFAULT_BUFLEN 512bool CreateSocket(SOCKET & sockOut);bool BinSocket(SOCKET sock);void Serve(SOCKET  clientSocket);bool SetupServer(){SOCKET sock = INVALID_SOCKET;if(!CreateSocket(sock))return false;if(!BinSocket(sock))return false;if(listen(sock, SOMAXCONN) == SOCKET_ERROR){printf("Listen failed with error: %ld\n", WSAGetLastError());return false;}SOCKET  clientSocket = INVALID_SOCKET;// Accept a client socketclientSocket = accept(sock, NULL, NULL);if (clientSocket == INVALID_SOCKET) {printf("accept failed: %d\n", WSAGetLastError());return false;}Serve(clientSocket);closesocket(sock);return true;} bool CreateSocket(SOCKET & sockOut){int iFamily = AF_INET;    int iType = SOCK_STREAM; //tcp连接    int iProtocol = IPPROTO_TCP;int iResult = 0;sockOut = socket(iFamily, iType, iProtocol); if (sockOut == INVALID_SOCKET)  {        wprintf(L"socket function failed with error = %d\n", WSAGetLastError() );return false; }    else {        wprintf(L"socket function succeeded\n");     }return true;}bool BinSocket(SOCKET sock){// The socket address to be passed to bind    sockaddr_in service;service.sin_family = AF_INET;    service.sin_addr.s_addr = inet_addr("192.168.1.102"); //服务器IP    service.sin_port = htons(27015); //要使用的端口号    // Bind the socket.    int iResult = bind(sock, (SOCKADDR *) &service, sizeof (service));    if (iResult == SOCKET_ERROR) {        wprintf(L"bind failed with error %u\n", WSAGetLastError());        closesocket(sock);        return false;    }    else        wprintf(L"bind returned success\n");return true;}void Serve(SOCKET  clientSocket){const char * revInfo = "received";char recvbuf[DEFAULT_BUFLEN];int recvbuflen = DEFAULT_BUFLEN;int iResult = 0;do {iResult = recv(clientSocket, recvbuf, recvbuflen, 0);if (iResult > 0) {recvbuf[iResult]='\0';printf("Bytes received: %d\n", iResult);printf("context from client %s", recvbuf);send(clientSocket, revInfo, strlen(revInfo), 0);         }else if (iResult == 0)printf("Connection closing...\n");else {printf("recv failed: %d\n", WSAGetLastError());return ;}}while (iResult > 0);}

客户端代码(操作系统Win7专业版  编译器VS2010)

main.cpp

#include <WinSock2.h>#include <iostream>#define DEFAULT_BUFLEN 512#pragma comment(lib, "ws2_32.lib")bool StartUp(){//<此段代码源于MSDN>    WORD wVersionRequested;    WSADATA wsaData;    int err;//Use the MAKEWORD(lowbyte, highbyte) macro declared in Windef.h    wVersionRequested = MAKEWORD(2, 2);    err = WSAStartup(wVersionRequested, &wsaData);    if (err != 0) {        //Tell the user that we could not find a usable Winsock DLL.        printf("WSAStartup failed with error: %d\n", err);        return false;    }//Confirm that the Wup when done using the Winsock dll        //WSACleanup();//</此段代码源于MSDN>return true;}bool SetupServer();int main(){StartUp();SOCKET connectSocket = INVALID_SOCKET;//struct addrinfo * l;char * sendbuf = "this is test";char recvbuf[DEFAULT_BUFLEN];int recvbuflen = DEFAULT_BUFLEN;struct addrinfo hints;hints.ai_family = AF_INET;hints.ai_socktype = SOCK_STREAM;hints.ai_protocol = IPPROTO_TCP;connectSocket = socket(AF_INET,SOCK_STREAM,0);if(IPPROTO_TCP == INVALID_SOCKET){printf("socket failed with error:ld\n", WSAGetLastError());return 0;}sockaddr_in service;memset(&service, 0, sizeof(sockaddr_in));service.sin_family = AF_INET;service.sin_addr.s_addr = inet_addr("192.168.1.102");service.sin_port = htons(27015);int iResult = connect(connectSocket, (const sockaddr*)&service, sizeof(sockaddr));if(iResult == SOCKET_ERROR){wprintf(L"connnect function failed with error:%ld\n", WSAGetLastError());switch(WSAGetLastError()){case WSAECONNREFUSED:wprintf(L"No connection could be made because the target machine actively refused it");break;}return 0;}//ZeroMemory(&hints, sizeof(hints));iResult = send(connectSocket, sendbuf, (int)strlen(sendbuf), 0);if(iResult == SOCKET_ERROR){printf("send failed");return 0;}iResult = recv(connectSocket, recvbuf, recvbuflen, 0);if(iResult==0)printf("Connection closed\n");else if(iResult <0)printf("rev failed");else{recvbuf[iResult] = '\0';printf("Recieve from server:%s", recvbuf);}WSACleanup();std::cin.get();return 0;}

 

函数解释参见MSDN