WSA.rar_WSA

// WSA_Server.cpp // By Baozhong Chengㄛ02-21-2010 // Windows Socket API Server side program // NOTE: // 1. add ws2_32.lib into project properties "link -> input -> additional library" // 2. using WSA_Server.cpp instead of WSA_Server.c to declare variable in // the middle of a function, make it more readable /* ------------------------------------------------------------------------------------ 1. Initialize WSA 每 WSAStartup(). 2. Create a socket 每 socket(). 3. Bind the socket 每 bind(). 4. Listen on the socket 每 listen(). 5. Accept a connection 每 accept(), connect(). 6. Send and receive data 每 recv(), send(), recvfrom(), sendto(). 7. Disconnect 每 closesocket(). 8. Clearn up WSA - WSACleanup(); ------------------------------------------------------------------------------------- */ #include <stdio.h> #include <winsock2.h> int main() { WORD wVersionRequested; WSADATA wsaData; int wsaerr; // ----------------- 1. Initialize WSA 每 WSAStartup(). ------------------- wVersionRequested = MAKEWORD(2, 2); // Using Winsock version request 2.2 wsaerr = WSAStartup(wVersionRequested, &wsaData); if (wsaerr != 0) { printf("The Winsock dll not found!\n"); return 0; } // ----------------- 2. Create a socket 每 socket(). ------------------- SOCKET m_socket; m_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (m_socket == INVALID_SOCKET) { printf("Error at socket(): %ld\n", WSAGetLastError()); WSACleanup(); return 0; } // ----------------- 3. Bind the socket 每 bind(). ------------------- sockaddr_in service; // Create a sockaddr_in object and set its values. service.sin_family = AF_INET; // AF_INET is the Internet address family. service.sin_addr.s_addr = inet_addr("127.0.0.1"); service.sin_port = htons(55555); // 55555 is the port number if (bind(m_socket, (SOCKADDR*)&service, sizeof(service)) == SOCKET_ERROR) { printf("bind() failed: %ld.\n", WSAGetLastError()); closesocket(m_socket); return 0; } // ----------------- 4. Listen on the socket 每 listen(). ------------------- // Call the listen function, passing the created socket and the maximum number of allowed // connections to accept as parameters. Check for general errors. if (listen( m_socket, 1) == SOCKET_ERROR) { printf("listen(): Error listening on socket %ld.\n", WSAGetLastError()); return 0; } // ----------------- 5. Accept a connection 每 accept(), connect(). ------------------- SOCKET AcceptSocket; // Create a temporary SOCKET object for accepting connections. printf("Server is ready...run your client program...\n"); while (1) { AcceptSocket = SOCKET_ERROR; while (AcceptSocket == SOCKET_ERROR) AcceptSocket = accept(m_socket, NULL, NULL); printf("Server: Client Connected!\n"); m_socket = AcceptSocket; break; } // ----------------- 6. Send and receive data 每 recv(), send(), recvfrom(), sendto(). ------------------- int bytesSent; int bytesRecv = SOCKET_ERROR; char sendbuf[200] = "This string is a test data from server"; char recvbuf[200] = ""; // initialize to empty data... // Send some test string to client... printf("Server: Sending some test data to client...\n"); bytesSent = send(m_socket, sendbuf, strlen(sendbuf), 0); if (bytesSent == SOCKET_ERROR) printf("Server: send() error %ld.\n", WSAGetLastError()); // Receives some test string from client...and client bytesRecv = recv(m_socket, recvbuf, 200, 0); if (bytesRecv == SOCKET_ERROR) printf("Server: recv() error %ld.\n", WSAGetLastError()); else { printf("Server: recv() is OK.\n"); printf("Server: Received data is: \"%s\"\n", recvbuf); printf("Server: Bytes received: %ld.\n", bytesRecv); } // ----------------- 7. Disconnect 每 closesocket(). ------------------- closesocket(m_socket); // ----------------- 8. Clearn up WSA - WSACleanup(); ------------------- WSACleanup(); return 0; }