多网卡的广播

1)多网卡广播时，每个网卡都绑定一次，广播一次，才能保证网络里都能收到该广播消息

m_Socket = socket( AF_INET, SOCK_DGRAM, 0 );

    // set a socket option
    BOOL  bBroadcast = TRUE;
    nResult = setsockopt(    m_Socket,
                            SOL_SOCKET,
                            SO_BROADCAST,
                            ( char *)&bBroadcast,
                            sizeof (  BOOL  )
                        );
m_saUdpCli.sin_family        = AF_INET;
    m_saUdpCli.sin_addr.s_addr    = inet_addr(m_szLocalHostIP); //这个IP就是我选择要发送广播包的网卡的IP
    m_saUdpCli.sin_port            = htons( UDP_UDAP_PORT );
nResult = bind( m_Socket, (SOCKADDR *)&m_saUdpCli,  sizeof (SOCKADDR_IN) );

2）判断ping一个ip

#include <IPHlpApi.h> #pragma comment(lib, "iphlpapi.lib") class CPing { public : CPing( void ); ~CPing( void ); private : HINSTANCE hIcmp; typedef HANDLE (WINAPI *PIcmpCreateFile)( VOID ); typedef DWORD (WINAPI *PIcmpSendEcho)( HANDLE , IPAddr, LPVOID , WORD , PIP_OPTION_INFORMATION, LPVOID , DWORD , DWORD ); typedef BOOL (WINAPI *PIcmpCloseHandle)( HANDLE ); PIcmpCreateFile pIcmpCreateFile; PIcmpSendEcho pIcmpSendEcho; PIcmpCloseHandle pIcmpCloseHandle; public : //功能：ping某个地址或者Ip，返回结果 //参数：v_pszDesAddress-目标域名或者IP //参数：v_usTimes-需要ping的次数 //参数：v_ulTimeout-超时时间，单位毫秒 //返回值：-1-发生异常,其他大于等于0的值表示未超时的次数 int Ping( const char *v_pszDesAdress, USHORT v_usTimes, ULONG v_ulTimeout); }; #include "StdAfx.h" #include ".\ping.h" #ifdef _DEBUG #define new DEBUG_NEW #endif //构造函数 CPing::CPing( void ) { hIcmp = LoadLibrary( "icmp.dll" ); if (NULL != hIcmp) { pIcmpCreateFile = (PIcmpCreateFile)GetProcAddress(hIcmp, "IcmpCreateFile" ); pIcmpSendEcho = (PIcmpSendEcho)GetProcAddress(hIcmp, "IcmpSendEcho" ); pIcmpCloseHandle = (PIcmpCloseHandle)GetProcAddress(hIcmp, "IcmpCloseHandle" ); } } //析构函数 CPing::~CPing( void ) { FreeLibrary(hIcmp); } //功能：ping某个地址或者Ip，返回结果 //参数：v_pszDesAddress-目标域名或者IP //参数：v_usTimes-需要ping的次数 //参数：v_ulTimeout-超时时间，单位毫秒 //返回值：-1-发生异常,其他大于等于0的值表示未超时的次数 int CPing::Ping( const char *v_pszDesAdress, USHORT v_usTimes, ULONG v_ulTimeout) { ULONG ulDesIP = 0; int ret = 0; // 当传递的参数为域名时，解析该域名的IP ulDesIP = inet_addr(v_pszDesAdress); //域名 if (ulDesIP == INADDR_NONE) { // 解析传入域名的IP PHOSTENT pHostent = gethostbyname(v_pszDesAdress); if (pHostent == NULL) { return -1; } ulDesIP = *( DWORD *)pHostent->h_addr; } // 申请发送缓冲区 void *sendBuffer = new char [32]; if (sendBuffer == NULL) { return -1; } // 申请接收缓冲区 unsigned long replySize = sizeof (ICMP_ECHO_REPLY) + 32; void *replyBuffer = new char [replySize]; if (replyBuffer == NULL) { delete [] sendBuffer; sendBuffer = NULL; return -1; } PICMP_ECHO_REPLY pIcmpEchoReply = (PICMP_ECHO_REPLY)replyBuffer; // 获取ICMP echo所需句柄 HANDLE hIcmpFile = pIcmpCreateFile(); if (hIcmpFile == INVALID_HANDLE_VALUE) { delete [] sendBuffer; sendBuffer = NULL; delete [] replyBuffer; replyBuffer = NULL; return -1; } // 调用IcmpSendEcho，获取Ping值 for ( int i=0; i<v_usTimes; i++) { pIcmpSendEcho(hIcmpFile, ulDesIP, sendBuffer, 32, NULL, replyBuffer, replySize, v_ulTimeout); if (pIcmpEchoReply->Status == 0) // 未超时 { ret++; } } //释放缓冲区，关闭句柄 delete [] replyBuffer; delete [] sendBuffer; pIcmpCloseHandle(hIcmpFile); return ret; }