【例子介绍】
【相关图片】
【源码结构】
uses
winsock;
////////////////
function PingHost(HostIP: String): Boolean;
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;
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:PChar;
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(AnsiString(HostIP)));
MyString := 'Hello,World'; //send data buffer
pReqData := PChar(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 := 4000;
try
Result := IcmpSendEcho(hICMP, FIPAddress, pReqData,
Length(MyString),nil,pIPE,BufferSize,FTimeOut)>0;
finally
IcmpCloseHandle(hICMP);
FreeLibrary(hICMPdll);
FreeMem(pRevData);
FreeMem(pIPE);
end;
end;
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