ping指定地址

最近用到相应功能，网上搜了下。

感谢网友的分享，原文链接如下：http://blog.csdn.net/nanfeiyannan/article/details/6636280

稍微更改了内容，代码如下：

unit uPing;

interface

uses
  WinSock, Windows;

type
  PIPOptionInformation = ^TIPOptionInformation;

  TIPOptionInformation = packed record
    TTL: Byte;
    TOS: Byte;
    Flags: Byte;
    OptionsSize: Byte;
    OptionsData: PChar;
  end;

  PIcmpEchoReply = ^TIcmpEchoReply;

  TIcmpEchoReply = packed record
    Address: DWORD;
    Status: DWORD;
    RTT: DWORD;
    DataSize: Word;
    Reserved: Word;
    Data: Pointer;
    Options: TIPOptionInformation;
  end;

  TIcmpCreateFile = function: THandle; stdcall;
  TIcmpCloseHandle = function(IcmpHandle: THandle): Boolean; stdcall;
  TIcmpSendEcho = function(IcmpHandle: THandle; DestinationAddress: DWORD;
    RequestData: Pointer; RequestSize: Word;
    RequestOptions: PIPOptionInformation; ReplyBuffer: Pointer;
    ReplySize: DWORD; Timeout: DWORD): DWORD; stdcall;

function PingHost(HostIP: String): Boolean;

implementation

function PingHost(HostIP: String): Boolean;

var
  hICMP: THandle;
  hICMPdll: THandle;
  IcmpCreateFile: TIcmpCreateFile;
  IcmpCloseHandle: TIcmpCloseHandle;
  IcmpSendEcho: TIcmpSendEcho;
  pIPE: PIcmpEchoReply; // ICMP   Echo   reply   buffer
  FIPAddress: DWORD;
  FSize: DWORD;
  FTimeOut: DWORD;
  BufferSize: DWORD;
  pReqData, pRevData: PAnsiChar;
  MyString: string;
begin
  Result := False;
  hICMPdll := LoadLibrary('icmp.dll');
  if hICMPdll = 0 then
    exit;
  @IcmpCreateFile := GetProcAddress(hICMPdll, 'IcmpCreateFile');
  @IcmpCloseHandle := GetProcAddress(hICMPdll, 'IcmpCloseHandle');
  @IcmpSendEcho := GetProcAddress(hICMPdll, 'IcmpSendEcho');
  hICMP := IcmpCreateFile;
  if (hICMP = INVALID_HANDLE_VALUE) then
    exit;
  FIPAddress := inet_addr(PAnsiChar(HostIP));
  MyString := 'Hello,World'; // send   data   buffer
  pReqData := PAnsiChar(MyString);
  FSize := 40; // receive   data   buffer
  BufferSize := SizeOf(TIcmpEchoReply) + FSize;
  GetMem(pIPE, BufferSize);
  FillChar(pIPE^, SizeOf(pIPE^), 0);
  GetMem(pRevData, FSize);
  pIPE^.Data := pRevData;
  FTimeOut := 1000;
  try
    Result := IcmpSendEcho(hICMP, FIPAddress, pReqData, Length(MyString), nil,
      pIPE, BufferSize, FTimeOut) > 0;
  finally
    IcmpCloseHandle(hICMP);
    FreeLibrary(hICMPdll);
    FreeMem(pRevData);
    FreeMem(pIPE);
  end;
end;

end.

现将代码放这，有空再吃透代码。