本文整理自网络，侵删。
介绍
本代码实现了windows的ping的功能，通过使用icmp.dll里的IcmpSendEcho()函数，来发送Ping命令，具体代码：
function TPing.PingHost(IP: string; var RTT: DWORD; TTL: Byte = 64; TimeOut: DWORD = 4000): Integer;
var
// IP Options for packet to send
IPOpt: TIPOptionInformation;
FIPAddress: DWORD;
pReqData, pRevData: PAnsiChar;
// ICMP Echo reply buffer
pIPE: PIcmpEchoReply;
FSize: DWORD;
MyString: AnsiString;
FTimeOut: DWORD;
BufferSize: DWORD;
OpResult: DWORD;
begin
Result := -1;
RTT := 0;
if ip <> '' then
begin
FIPAddress := inet_addr(MarshaledAString(AnsiString(IP)));
FSize := 30;
BufferSize := SizeOf(TIcmpEchoReply) + FSize;
GetMem(pRevData, FSize);
GetMem(pIPE, BufferSize);
FillChar(pIPE^, SizeOf(pIPE^), 0);
pIPE^.DataPtr := pRevData;
MyString := 'Test Net - Sos Admin';
pReqData := PAnsiChar(MyString);
FillChar(IPOpt, SizeOf(IPOpt), 0);
IPOpt.TTL := TTL;
FTimeOut := TimeOut;
try
OpResult := IcmpSendEcho(hICMP, FIPAddress, pReqData, Length(MyString), @IPOpt, pIPE, BufferSize, FTimeOut);
Result := PIPE.Status;
if pIPE.Status = 0 then
RTT := PIPE.RTT;
except
Result := -2;
FreeMem(pRevData);
FreeMem(pIPE);
Exit;
end;
FreeMem(pRevData);
FreeMem(pIPE);
end;
end;
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