winsock基础编程 -- server代码样例

最新推荐文章于 2020-07-01 18:40:45 发布

转载最新推荐文章于 2020-07-01 18:40:45 发布 · 949 阅读

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#server #编程 #socket #null #stream #tcp

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本文介绍了一个简单的TCP服务器实现过程，包括初始化Winsock、创建监听套接字、接受客户端连接请求及数据收发等关键步骤。

#define WIN32_LEAN_AND_MEAN #include <windows.h> #include <winsock2.h> #include <ws2tcpip.h> #include <stdlib.h> #include <stdio.h> // Need to link with Ws2_32.lib, Mswsock.lib, and Advapi32.lib #pragma comment (lib, "Ws2_32.lib") #pragma comment (lib, "Mswsock.lib") #pragma comment (lib, "AdvApi32.lib") #define DEFAULT_BUFLEN 512 #define DEFAULT_PORT "27015" int __cdecl main(void) { WSADATA wsaData; SOCKET ListenSocket = INVALID_SOCKET, ClientSocket = INVALID_SOCKET; struct addrinfo *result = NULL, hints; char recvbuf[DEFAULT_BUFLEN]; int iResult, iSendResult; int recvbuflen = DEFAULT_BUFLEN; // Initialize Winsock iResult = WSAStartup(MAKEWORD(2,2), &wsaData); if (iResult != 0) { printf("WSAStartup failed with error: %d/n", iResult); return 1; } ZeroMemory(&hints, sizeof(hints)); hints.ai_family = AF_INET; hints.ai_socktype = SOCK_STREAM; hints.ai_protocol = IPPROTO_TCP; hints.ai_flags = AI_PASSIVE; // Resolve the server address and port iResult = getaddrinfo(NULL, DEFAULT_PORT, &hints, &result); if ( iResult != 0 ) { printf("getaddrinfo failed with error: %d/n", iResult); WSACleanup(); return 1; } // Create a SOCKET for connecting to server ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol); if (ListenSocket == INVALID_SOCKET) { printf("socket failed with error: %ld/n", WSAGetLastError()); freeaddrinfo(result); WSACleanup(); return 1; } // Setup the TCP listening socket iResult = bind( ListenSocket, result->ai_addr, (int)result->ai_addrlen); if (iResult == SOCKET_ERROR) { printf("bind failed with error: %d/n", WSAGetLastError()); closesocket(ListenSocket); WSACleanup(); return 1; } freeaddrinfo(result); iResult = listen(ListenSocket, SOMAXCONN); if (iResult == SOCKET_ERROR) { printf("listen failed with error: %d/n", WSAGetLastError()); closesocket(ListenSocket); WSACleanup(); return 1; } // Accept a client socket ClientSocket = accept(ListenSocket, NULL, NULL); if (ClientSocket == INVALID_SOCKET) { printf("accept failed with error: %d/n", WSAGetLastError()); closesocket(ListenSocket); WSACleanup(); return 1; } // No longer need server socket closesocket(ListenSocket); // Receive until the peer shuts down the connection do { iResult = recv(ClientSocket, recvbuf, recvbuflen, 0); if (iResult > 0) { printf("Bytes received: %d/n", iResult); // Echo the buffer back to the sender iSendResult = send( ClientSocket, recvbuf, iResult, 0 ); if (iSendResult == SOCKET_ERROR) { printf("send failed with error: %d/n", WSAGetLastError()); closesocket(ClientSocket); WSACleanup(); return 1; } printf("Bytes sent: %d/n", iSendResult); } else if (iResult == 0) printf("Connection closing.../n"); else { printf("recv failed with error: %d/n", WSAGetLastError()); closesocket(ClientSocket); WSACleanup(); return 1; } } while (iResult > 0); // shutdown the connection since we're done iResult = shutdown(ClientSocket, SD_SEND); if (iResult == SOCKET_ERROR) { printf("shutdown failed with error: %d/n", WSAGetLastError()); closesocket(ClientSocket); WSACleanup(); return 1; } // cleanup closesocket(ClientSocket); WSACleanup(); return 0; }