用delphi实现ping

看了好多次有网友的提出关于用delphi实现ping的问题，今天又看到了；
所以就将这个功能写成一个类，并且提供一个函数方便大家的使用！

函数
procedure pinghost(ip:string;var info:string);
ip:目标ＩＰ地址；
info:ping了以后产生的信息(1)或(2)；
(1)成功信息
ip 发送测试的字符数　返回时间
(2)出错信息
Can not find host!

使用
uses ping;

procedure TForm1.Button1Click(Sender: TObject);
var
str:string;
ping:Tping;
begin
ping:=Tping.create ;//一定要初试化哦
ping.pinghost(''''127.0.0.1'''',str);
memo1.Lines.Add(str);
ping.destroy ;
end;

[ping.pas]

(*作者：e梦缘*）

unit ping;

interface

uses

Windows, SysUtils, Classes, Controls, Winsock,
StdCtrls;

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;

Tping =class(Tobject)

private
{ Private declarations }
hICMP: THANDLE;
IcmpCreateFile : TIcmpCreateFile;
IcmpCloseHandle: TIcmpCloseHandle;
IcmpSendEcho: TIcmpSendEcho;
public
procedure pinghost(ip:string;var info:string);
constructor create;
destructor destroy;override;
{ Public declarations }
end;

var
hICMPdll: HMODULE;

implementation

constructor Tping.create;
begin
inherited create;
hICMPdll := LoadLibrary(''''icmp.dll'''');
@ICMPCreateFile := GetProcAddress(hICMPdll, ''''IcmpCreateFile'''');
@IcmpCloseHandle := GetProcAddress(hICMPdll,''''IcmpCloseHandle'''');
@IcmpSendEcho := GetProcAddress(hICMPdll, ''''IcmpSendEcho'''');
hICMP := IcmpCreateFile;
end;

destructor Tping.destroy;
begin
FreeLibrary(hIcmpDll);
inherited destroy;
end;

procedure Tping.pinghost(ip:string;var info:string);
var
// IP Options for packet to send
IPOpt:TIPOptionInformation;
FIPAddress:DWORD;
pReqData,pRevData:PChar;
// ICMP Echo reply buffer
pIPE:PIcmpEchoReply;
FSize: DWORD;
MyString:string;
FTimeOut:DWORD;
BufferSize:DWORD;
begin

if ip <> '''''''' then
begin
FIPAddress := inet_addr(PChar(ip));
FSize := 40;
BufferSize := SizeOf(TICMPEchoReply) FSize;
GetMem(pRevData,FSize);
GetMem(pIPE,BufferSize);
FillChar(pIPE^, SizeOf(pIPE^), 0);
pIPE^.Data := pRevData;
MyString := ''''Test Net - Sos Admin'''';
pReqData := PChar(MyString);
FillChar(IPOpt, Sizeof(IPOpt), 0);
IPOpt.TTL := 64;
FTimeOut := 4000;
try
IcmpSendEcho(hICMP, FIPAddress, pReqData, Length(MyString),@IPOpt, pIPE, BufferSize, FTimeOut);
if pReqData^ = pIPE^.Options.OptionsData^ then
info:=ip ''''　'''' IntToStr(pIPE^.DataSize) ''''　　　'''' IntToStr(pIPE^.RTT);
except
info:=''''Can not find host!'''';
FreeMem(pRevData);
FreeMem(pIPE);
Exit;
end;
FreeMem(pRevData);
FreeMem(pIPE);
end;

end;

end.

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