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Delphi编程实现Ping操作(3)
@IcmpSendEcho := GetProcAddress(hICMPdll, 'IcmpSendEcho');
hICMP := IcmpCreateFile;
StatusShow.Text := '';
StatusShow.Lines.Add('目的IP地址 字节数 返回时间(毫秒)');
end;
接下来，就要进行如下所示的Ping操作的实际编程过程了。
procedure TMyPing.ExeBtnClick(Sender: TObject);
var
IPOpt:TIPOptionInformation;// IP Options for packet to send
FIPAddress:DWord;
pReqData,pRevData:PChar;
pIPE:PIcmpEchoReply;// ICMP Echo reply buffer
FSize: DWord;
MyString:string;
FTimeOut:DWord;
BufferSize:DWord;
begin
if PingEdit.Text <> '' then
begin
FIPAddress := inet_addr(PChar(PingEdit.Text));
FSize := 40;
BufferSize := SizeOf(TICMPEchoReply) + FSize;
GetMem(pRevData,FSize);
GetMem(pIPE,BufferSize);
FillChar(pIPE^, SizeOf(pIPE^), 0);
pIPE^.Data := pRevData;
MyString := 'Hello,World';
pReqData := PChar(MyString);
FillChar(IPOpt, Sizeof(IPOpt), 0);
IPOpt.TTL := 64;
FTimeOut := 4000;
IcmpSendEcho(hICMP, FIPAddress, pReqData, Length(MyString), @IPOpt, pIPE, BufferSize, FTimeOut);
if pReqData^ = pIPE^.Options.OptionsData^ then
begin
StatusShow.Lines.Add(PChar(PingEdit.Text) + ' ' +IntToStr(pIPE^.DataSize) + ' ' +IntToStr(pIPE^.RTT));
end;
FreeMem(pRevData);
FreeMem(pIPE);
end
end;
通过上面的编程，我们就实现了Ping功能的界面操作。实际上，ICMP协议的功能还有很多，都可以通过对Icmp.dll的函数调用来实现。
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