获取IP地址以及全部TCPIP连接的掩码
问题提出/摘要:我们有很多种方法获取一台计算机的IP地址，但这里才是“正确”的方法：列出所有的地址、网络掩码、广播地址和连接状态等，包括环回点 127.0.0.1。需要使用到WinSock2。 回答: 这是一个完整的Delphi单元，将它加入到你的工程中，你可以调用： EnumInterfaces(var s string): Boolean; 来返回所有IP地址、网络掩码、广播地址和连接状态。 -------------------------------------------------------------------- unit USock; interface uses Windows, Winsock; { 此函数列举出所有的TCP/IP连接，并返回一个由回车换行(CRLF)符分隔的字符串，包含以下信息： IP, NetMask, BroadCast-Address, Up/Down status, Broadcast support, Loopback 如果你将这个字符串赋给TMemo(它的Memo.Lines.Text属性)，你可以看到更清晰的结果。 使用此函数，你需要Win98/ME/2K, 95 OSR 2 或者NT service pack #3，因为程序会使用到WinSock 2(WS2_32.DLL)。 } function EnumInterfaces(var sInt: string): Boolean; { 从Winsock 2.0导入函数WSAIOCtl -- 在Win98/ME/2K and 95 OSR2, NT srv pack #3下才有Winsock 2 } function WSAIoctl(s: TSocket; cmd: DWORD; lpInBuffer: PCHAR; dwInBufferLen: DWORD; lpOutBuffer: PCHAR; dwOutBufferLen: DWORD; lpdwOutBytesReturned: LPDWORD; lpOverLapped: POINTER; lpOverLappedRoutine: POINTER): Integer; stdcall; external 'WS2_32.DLL'; { Constants taken from C header files } const SIO_GET_INTERFACE_LIST = $4004747F; IFF_UP = $00000001; IFF_BROADCAST = $00000002; IFF_LOOPBACK = $00000004; IFF_POINTTOPOINT = $00000008; IFF_MULTICAST = $00000010; type sockaddr_gen = packed record AddressIn: sockaddr_in; filler: packed array[0..7] of char; end; type INTERFACE_INFO = packed record iiFlags: u_long; // Interface flags iiAddress: sockaddr_gen; // Interface address iiBroadcastAddress: sockaddr_gen; // Broadcast address iiNetmask: sockaddr_gen; // Network mask end; implementation {------------------------------------------------------------------- 1. 打开Winsock 2. 创建一个socket 3. 调用WSAIOCtl获取网络连接 4. 对每个连接，获取它的IP、掩码、广播地址、状态 5. 将信息填充到一个由CDLF分隔的字符串中 6. 结束 --------------------------------------------------------------------} function EnumInterfaces(var sInt: string): Boolean; var s: TSocket; wsaD: WSADATA; NumInterfaces: Integer; BytesReturned, SetFlags: u_long; pAddrInet: SOCKADDR_IN; pAddrString: PCHAR; PtrA: pointer; Buffer: array[0..20] of INTERFACE_INFO; i: Integer; begin result := true; // Initialize sInt := ''; WSAStartup($0101, wsaD); // Start WinSock // You should normally check // for errors here :) s := Socket(AF_INET, SOCK_STREAM, 0); // Open a socket if (s = INVALID_SOCKET) then exit; try // Call WSAIoCtl PtrA := @bytesReturned; if (WSAIoCtl(s, SIO_GET_INTERFACE_LIST, nil, 0, @Buffer, 1024, PtrA, nil, nil) <> SOCKET_ERROR) then begin // If ok, find out how // many interfaces exist NumInterfaces := BytesReturned div SizeOf(INTERFACE_INFO); for i := 0 to NumInterfaces - 1 do // For every interface begin pAddrInet := Buffer[i].iiAddress.addressIn; // IP ADDRESS pAddrString := inet_ntoa(pAddrInet.sin_addr); sInt := sInt + ' IP=' + pAddrString + ','; pAddrInet := Buffer[i].iiNetMask.addressIn; // SUBNET MASK pAddrString := inet_ntoa(pAddrInet.sin_addr); sInt := sInt + ' Mask=' + pAddrString + ','; pAddrInet := Buffer[i].iiBroadCastAddress.addressIn; // Broadcast addr pAddrString := inet_ntoa(pAddrInet.sin_addr); sInt := sInt + ' Broadcast=' + pAddrString + ','; SetFlags := Buffer[i].iiFlags; if (SetFlags and IFF_UP) = IFF_UP then sInt := sInt + ' Interface UP,' // Interface up/down else sInt := sInt + ' Interface DOWN,'; if (SetFlags and IFF_BROADCAST) = IFF_BROADCAST then // Broadcasts sInt := sInt + ' Broadcasts supported,' // supported or else // not supported sInt := sInt + ' Broadcasts NOT supported,'; if (SetFlags and IFF_LOOPBACK) = IFF_LOOPBACK then // Loopback or sInt := sInt + ' Loopback interface' else sInt := sInt + ' Network interface'; // normal sInt := sInt + #13#10; // CRLF between // each interface end; end; except end; // // Close sockets // CloseSocket(s); WSACleanUp; result := false; end; end.
问题提出/摘要:我们有很多种方法获取一台计算机的IP地址，但这里才是“正确”的方法：列出所有的地址、网络掩码、广播地址和连接状态等，包括环回点 127.0.0.1。需要使用到WinSock2。 回答: 这是一个完整的Delphi单元，将它加入到你的工程中，你可以调用： EnumInterfaces(var s string): Boolean; 来返回所有IP地址、网络掩码、广播地址和连接状态。 -------------------------------------------------------------------- unit USock; interface uses Windows, Winsock; { 此函数列举出所有的TCP/IP连接，并返回一个由回车换行(CRLF)符分隔的字符串，包含以下信息： IP, NetMask, BroadCast-Address, Up/Down status, Broadcast support, Loopback 如果你将这个字符串赋给TMemo(它的Memo.Lines.Text属性)，你可以看到更清晰的结果。 使用此函数，你需要Win98/ME/2K, 95 OSR 2 或者NT service pack #3，因为程序会使用到WinSock 2(WS2_32.DLL)。 } function EnumInterfaces(var sInt: string): Boolean; { 从Winsock 2.0导入函数WSAIOCtl -- 在Win98/ME/2K and 95 OSR2, NT srv pack #3下才有Winsock 2 } function WSAIoctl(s: TSocket; cmd: DWORD; lpInBuffer: PCHAR; dwInBufferLen: DWORD; lpOutBuffer: PCHAR; dwOutBufferLen: DWORD; lpdwOutBytesReturned: LPDWORD; lpOverLapped: POINTER; lpOverLappedRoutine: POINTER): Integer; stdcall; external 'WS2_32.DLL'; { Constants taken from C header files } const SIO_GET_INTERFACE_LIST = $4004747F; IFF_UP = $00000001; IFF_BROADCAST = $00000002; IFF_LOOPBACK = $00000004; IFF_POINTTOPOINT = $00000008; IFF_MULTICAST = $00000010; type sockaddr_gen = packed record AddressIn: sockaddr_in; filler: packed array[0..7] of char; end; type INTERFACE_INFO = packed record iiFlags: u_long; // Interface flags iiAddress: sockaddr_gen; // Interface address iiBroadcastAddress: sockaddr_gen; // Broadcast address iiNetmask: sockaddr_gen; // Network mask end; implementation {------------------------------------------------------------------- 1. 打开Winsock 2. 创建一个socket 3. 调用WSAIOCtl获取网络连接 4. 对每个连接，获取它的IP、掩码、广播地址、状态 5. 将信息填充到一个由CDLF分隔的字符串中 6. 结束 --------------------------------------------------------------------} function EnumInterfaces(var sInt: string): Boolean; var s: TSocket; wsaD: WSADATA; NumInterfaces: Integer; BytesReturned, SetFlags: u_long; pAddrInet: SOCKADDR_IN; pAddrString: PCHAR; PtrA: pointer; Buffer: array[0..20] of INTERFACE_INFO; i: Integer; begin result := true; // Initialize sInt := ''; WSAStartup($0101, wsaD); // Start WinSock // You should normally check // for errors here :) s := Socket(AF_INET, SOCK_STREAM, 0); // Open a socket if (s = INVALID_SOCKET) then exit; try // Call WSAIoCtl PtrA := @bytesReturned; if (WSAIoCtl(s, SIO_GET_INTERFACE_LIST, nil, 0, @Buffer, 1024, PtrA, nil, nil) <> SOCKET_ERROR) then begin // If ok, find out how // many interfaces exist NumInterfaces := BytesReturned div SizeOf(INTERFACE_INFO); for i := 0 to NumInterfaces - 1 do // For every interface begin pAddrInet := Buffer[i].iiAddress.addressIn; // IP ADDRESS pAddrString := inet_ntoa(pAddrInet.sin_addr); sInt := sInt + ' IP=' + pAddrString + ','; pAddrInet := Buffer[i].iiNetMask.addressIn; // SUBNET MASK pAddrString := inet_ntoa(pAddrInet.sin_addr); sInt := sInt + ' Mask=' + pAddrString + ','; pAddrInet := Buffer[i].iiBroadCastAddress.addressIn; // Broadcast addr pAddrString := inet_ntoa(pAddrInet.sin_addr); sInt := sInt + ' Broadcast=' + pAddrString + ','; SetFlags := Buffer[i].iiFlags; if (SetFlags and IFF_UP) = IFF_UP then sInt := sInt + ' Interface UP,' // Interface up/down else sInt := sInt + ' Interface DOWN,'; if (SetFlags and IFF_BROADCAST) = IFF_BROADCAST then // Broadcasts sInt := sInt + ' Broadcasts supported,' // supported or else // not supported sInt := sInt + ' Broadcasts NOT supported,'; if (SetFlags and IFF_LOOPBACK) = IFF_LOOPBACK then // Loopback or sInt := sInt + ' Loopback interface' else sInt := sInt + ' Network interface'; // normal sInt := sInt + #13#10; // CRLF between // each interface end; end; except end; // // Close sockets // CloseSocket(s); WSACleanUp; result := false; end; end.
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