一个简单的UDP广播例子(含C/S)

来源：互联网发布：莫知我哀影九小说编辑：程序博客网时间：2024/05/10 02:10

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;      }