一个简单的UDP广播例子(含C/S)

一个简单的UDP广播通讯的例子程序，含有服务端和客户端的代码。

// 服务端 // BoardCast_Server.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include <WinSock2.h> #include <Windows.h> #pragma comment(lib, "WS2_32.lib") int _tmain(int argc, _TCHAR* argv[]) { WORD wVersionRequested = MAKEWORD(2, 2); WSADATA wsaData; if(0 != WSAStartup(wVersionRequested, &wsaData)) { printf("WSAStartup failed with error: %d/n", GetLastError()); return EXIT_FAILURE; } if(2 != HIBYTE(wsaData.wVersion) || 2 != LOBYTE(wsaData.wVersion)) { printf("Socket version not supported./n"); WSACleanup(); return EXIT_FAILURE; } SOCKET sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if(INVALID_SOCKET == sock) { printf("socket failed with error: %d/n", WSAGetLastError()); WSACleanup(); return EXIT_FAILURE; } SOCKADDR_IN addr; memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; addr.sin_addr.S_un.S_addr = htonl(INADDR_BROADCAST); addr.sin_port = htons(5150); BOOL bBoardcast = TRUE; if(SOCKET_ERROR == setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char*)&bBoardcast, sizeof(bBoardcast))) { printf("setsockopt failed with error code: %d/n", WSAGetLastError()); if(INVALID_SOCKET != sock) { closesocket(sock); sock = INVALID_SOCKET; } WSACleanup(); } printf("Server start, start to boardcast .../n"); char buf[] = {"Hello, this is boardcast!"}; while(TRUE) { if(SOCKET_ERROR == sendto(sock, buf, sizeof(buf), 0, (LPSOCKADDR)&addr, sizeof(addr))) { printf("sendto failed with error: %d/n", WSAGetLastError()); continue; } Sleep(1000); } WSACleanup(); return 0; }

 

// 客户端 // BoardCast_Client.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include <WinSock2.h> #include <Windows.h> #pragma comment(lib, "WS2_32.lib") int _tmain(int argc, _TCHAR* argv[]) { WORD wVersionRequested = MAKEWORD(2, 2); WSADATA wsaData; if(0 != WSAStartup(wVersionRequested, &wsaData)) { printf("WSAStartup failed with error: %d/n", GetLastError()); return EXIT_FAILURE; } if(2 != HIBYTE(wsaData.wVersion) || 2 != LOBYTE(wsaData.wVersion)) { printf("Socket version not supported./n"); WSACleanup(); return EXIT_FAILURE; } SOCKET sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if(INVALID_SOCKET == sock) { printf("socket failed with error: %d/n", WSAGetLastError()); WSACleanup(); return EXIT_FAILURE; } SOCKADDR_IN addr; memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; addr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); addr.sin_port = htons(5150); if(SOCKET_ERROR == bind(sock, (LPSOCKADDR)&addr, sizeof(addr))) { printf("bind failed with error: %d/n", WSAGetLastError()); if(INVALID_SOCKET != sock) { closesocket(sock); sock = INVALID_SOCKET; } WSACleanup(); return EXIT_FAILURE; } #define MAX_BUFFER 256 char szBuf[MAX_BUFFER] = {0}; SOCKADDR_IN remote; memset(&remote, 0, sizeof(remote)); int len = sizeof(remote); while(TRUE) { if(SOCKET_ERROR == recvfrom(sock, szBuf, MAX_BUFFER-1, 0, (LPSOCKADDR)&remote, &len)) { printf("recvfrom failed with error: %d/n", WSAGetLastError()); continue; } printf("recv data: <%s : %d> %s/n", inet_ntoa(remote.sin_addr), ntohs(remote.sin_port), szBuf); } return 0; }