获取地址 IP 信息

• 下载源代码 - 2.54 Mb
• 下载演示程序 - 20 Kb

引言

My Ip 提供了关于 IP 地址、适配器和已安装协议的信息。它提供了带有 MS SDK 注释的 WSADATA 结构体的详细信息。没有对这些含义进行解释，而是直接引用了 SDK 文本。IP 地址使用 GetNetworkParams 函数检索。另一个有用的功能是 IP 掩码，也显示出来了。这个工具对于测试网络配置和教学可能很有用。初学者可能会对检测网络参数的方式感兴趣。该程序是一个包含时钟的对话框。要运行 My Ip，必须安装 WinSock 2.2 DLL。我已经在 Windows XP 下测试过 My Ip，没有在其他操作系统上测试。主要使用的 WinSock 函数是 gethostbyname(...), WSAEnumProtocols(...), GetNumberOfInterfaces(...) 和 GetNetworkParams(...)。我制作这个工具是为了在未连接的情况下检测参数，并解决硬件和软件之间的冲突。源代码是用 Visual Studio .NET 2002（法语版本）编写的。主要工作是在 bool InitNetwork(void) 函数中完成的。

bool InitNetwork(void)
{
    int     iResult;
    DWORD   dwOutBufLen;

    char    szTmp[256];

    iResult = WSAStartup(MAKEWORD(2,2),&WsaData);
    if(iResult)
    {
        // Can't call WSAGetLastError() because WinSock DLL is not loaded !

        wsprintf(szTmp,"WSAStartup failed, returned error code : %d",iResult);
        MessageBox(NULL,szTmp,szError,MB_OK|MB_ICONEXCLAMATION);
        return (FALSE);
    }

    memset(szHostName,0,sizeof(szHostName));


 

    // Getting hostname
    if(gethostname(szHostName,sizeof(szHostName)) == SOCKET_ERROR)    
     return (ShowNetworkError("gethostname failed, returned error code : %d"));

    lpHostEnt = gethostbyname(szHostName);
    if(!lpHostEnt)    
     return (
     ShowNetworkError("gethostbyname failed, returned error code : %d"));

    dwBufLen = 0 ;    // Setting to 0, to have the real size of the new buffer

    iResult = WSAEnumProtocols(NULL,lpProtocolBuf,&dwBufLen);
    if(WSAENOBUFS != WSAGetLastError())    
     return (
      ShowNetworkError("WSAEnumProtocols failed, returned error code : %d"));
    
    // The buffer is too small, try to reallocate one with the desired size

    lpProtocolBuf = (WSAPROTOCOL_INFO *) MemoryAlloc(dwBufLen);
    if(!lpProtocolBuf)                    
      return (ShowNetworkError("Memory allocation failed"));
    
    // Returns number of protocols installed
    iNumberOfProtocols = WSAEnumProtocols(NULL, lpProtocolBuf,&dwBufLen) ;    
    if(iNumberOfProtocols == SOCKET_ERROR)
    {
      MemoryFree(lpProtocolBuf);
      return (
      ShowNetworkError("WSAEnumProtocols failed, returned error code : %d"));
    }

    lpFixedInfo = (FIXED_INFO *) MemoryAlloc(sizeof(FIXED_INFO));
    if(!lpFixedInfo)
    {
        MemoryFree(lpProtocolBuf) ;
        return (ShowNetworkError("Memory allocation failed")) ;
    }

    ulOutBufLen = sizeof(FIXED_INFO) ;
   
    iResult = (int) GetNetworkParams(lpFixedInfo,&ulOutBufLen);
    if(iResult == ERROR_BUFFER_OVERFLOW)
    {
        MemoryFree(lpFixedInfo) ;

        lpFixedInfo = (FIXED_INFO *) MemoryAlloc(ulOutBufLen);
        if(!lpFixedInfo)
        {
            MemoryFree(lpProtocolBuf) ;
            return (ShowNetworkError("Memory allocation failed"));
        }
    }
    else
    {
        if(iResult != ERROR_SUCCESS)
        {
            MemoryFree(lpFixedInfo) ;
            MemoryFree(lpProtocolBuf) ;
            return (
      ShowNetworkError("GetNetworkParams failed, returned error code : %d"));
        }
    }

    if(iResult = (int) GetNetworkParams(lpFixedInfo,&ulOutBufLen))
    {
        if(iResult != ERROR_SUCCESS)
        {
            MemoryFree(lpFixedInfo) ;
            MemoryFree(lpProtocolBuf) ;

            return (
      ShowNetworkError("GetNetworkParams failed, returned error code : %d"));
        }
    }

    dwOutBufLen = sizeof(IP_ADAPTER_INFO) ;
    lpAdapterInfo = (PIP_ADAPTER_INFO) MemoryAlloc(dwOutBufLen);
    if(!lpAdapterInfo)
    {
        MemoryFree(lpFixedInfo);
        MemoryFree(lpProtocolBuf);

        return (ShowNetworkError("Memory allocation failed"));
    }

    iResult = GetAdaptersInfo(lpAdapterInfo,&dwOutBufLen);

    if(iResult == ERROR_BUFFER_OVERFLOW)
    {
        MemoryFree(lpAdapterInfo) ;
        lpAdapterInfo = (PIP_ADAPTER_INFO) MemoryAlloc(dwOutBufLen);

        if(!lpAdapterInfo)
        {
            MemoryFree(lpFixedInfo);
            MemoryFree(lpProtocolBuf);

            return (ShowNetworkError("Memory allocation failed"));
        }
    }
    else
    {
        if(iResult != ERROR_SUCCESS)
        {
            MemoryFree(lpFixedInfo);
            MemoryFree(lpProtocolBuf);
            MemoryFree(lpAdapterInfo);

            return (
        ShowNetworkError("GetAdaptersInfo failed, returned error code : %d"));
        }
    }

    dwNumInterfaces = 0;
    GetNumberOfInterfaces(&dwNumInterfaces);

    return (WSACleanup() != SOCKET_ERROR);
}