我试图运行这个简单的服务器客户端程序使用winsock。 服务器正在接受客户端连接，但无法接收客户端发送的数据。 我正在努力寻找问题。
服务器：
#define _WINSOCK_DEPRECATED_NO_WARNINGS #include<iostream> #include<winsock2.h> #pragma comment(lib,"ws2_32.lib") #define DEFAULT_PORT 18000 int main(int argc, char *argv[]) { WSADATA wsa; SOCKET s, new_socket; struct sockaddr_in server, client; char *message, client_msg[2000]; int port, c, recv_size; if (argc > 2) { std::cout << "usage : " << argv[1] << " <PORT>\n"; std::cout << "If no port is given then default port is used.\n"; std::cout << "DEFAULT PORT : 18000\n"; return 1; } if (argc == 2) { port = atoi(argv[2]); } else { port = DEFAULT_PORT; } std::cout << "Initializing Winsock..."; if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0) { std::cout << "Failed. Error code" << WSAGetLastError(); return 1; } std::cout << "Initialized.\n\n"; if ((s = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) { std::cout << "Could not create Socket : " << WSAGetLastError() << "\n"; return 1; } std::cout << "Socket Created.\n"; server.sin_family = AF_INET; server.sin_addr.s_addr = INADDR_ANY; server.sin_port = htons(port); if (bind(s, (struct sockaddr *)&server, sizeof(server)) == SOCKET_ERROR) { std::cout << "Bind failed with error code : " << WSAGetLastError() << "\n"; } std::cout << "Bind done.\n"; listen(s, 3); std::cout << "Waiting for incoming connections...\n"; while (true) { c = sizeof(struct sockaddr_in); new_socket = accept(s, (struct sockaddr*)&client, &c); if (new_socket == INVALID_SOCKET) { closesocket(new_socket); std::cout << "Accept failed with error code : " << WSAGetLastError() << "\n"; } else { std::cout << "Connection accepted.\n"; if ((recv_size = recv(s, client_msg, 200, 0)) == SOCKET_ERROR) { closesocket(new_socket); std::cout << "Receive Failed.\n\n"; } else { if (strcmp(client_msg, "PASSWD")) { message = "HELLO!"; send(new_socket, message, strlen(message), 0); } else { message = "Authentication failed!"; send(new_socket, message, strlen(message), 0); closesocket(new_socket); } } } } closesocket(s); WSACleanup(); return 0; } 客户：
#define _WINSOCK_DEPRECATED_NO_WARNINGS #include<iostream> #include<winsock2.h> #pragma comment(lib,"ws2_32.lib") #define DEFAULT_SERVER "127.0.0.1" #define DEFAULT_PORT 18000 #define PASSWORD "PASSWD" int main(int argc, char *argv[]) { WSADATA wsa; SOCKET s; struct sockaddr_in server; char *message, server_reply[2000], *server_addr; int recv_size, port = DEFAULT_PORT; if (argc > 4) { std::cout << "usage : " << argv[0] << " <Server IP> <Server Port> [DATA]\n\n"; std::cout << "If any argument is missing, default values will be used.\n"; std::cout << "Default Address : localhost (127.0.0.1)\nDefault Port : 18000\nDefault DATA: 'PASSWD'\n\n"; return 1; } else if (argc == 4) { server_addr = argv[1]; port = atoi(argv[2]); message = argv[3]; } else if (argc == 3) { server_addr = argv[1]; port = atoi(argv[2]); message = PASSWORD; } else if (argc == 2) { server_addr = argv[1]; port = DEFAULT_PORT; message = PASSWORD; } else { server_addr = DEFAULT_SERVER; port = DEFAULT_PORT; message = PASSWORD; //server_addr = "127.0.0.1"; //port = 2222; //message = "HELLO"; } std::cout << "Initialising Winsock..\n"; if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0) { std::cout << "Failed.. Error Code : " << WSAGetLastError() << "\n"; return 1; } std::cout << "Winsock Initialised.\n"; if ((s = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) { std::cout << "Could not create socket : " << WSAGetLastError() << "\n"; } std::cout << "Socket Created.\n"; server.sin_addr.s_addr = inet_addr(server_addr); server.sin_family = AF_INET; server.sin_port = htons(port); if (connect(s, (struct sockaddr*)&server, sizeof(server)) < 0) { std::cout << "Could not connect to " << server_addr << " on port " << port << ".\n"; WSACleanup(); return 1; } std::cout << "Connected to " << server_addr << " on port " << port << ".\n\n"; if (send(s, message, strlen(message), 0) < 0) { std::cout << "Sending Data failed.\n"; WSACleanup(); return 1; } std::cout << "Data send.\n\n"; //Sleep(500); if ((recv_size = recv(s, server_reply, 20, 0)) == SOCKET_ERROR ) { std::cout << "Receive Failed.\n\n"; } else { server_reply[recv_size] = '\0'; std::cout << server_addr << " : " << server_reply << "\n"; } //Sleep(5000); closesocket(s); WSACleanup(); return 0; }
任何帮助，将不胜感激。 谢谢。
if（（recv_size = recv（s，client_msg，200，0））== SOCKET_ERROR）
在服务器端代码中将其更改为new_socket。