unit Ping;
interface
uses
Windows, SysUtils, Classes;
type
TSunB =
packed record
s_b1, s_b2, s_b3, s_b4: byte;
end;
TSunW =
packed record
s_w1, s_w2: word;
end;
PIPAddr = ^TIPAddr;
TIPAddr =
record
case integer
of
0: (S_un_b: TSunB);
1: (S_un_w: TSunW);
2: (S_addr: longword);
end;
IPAddr = TIPAddr;
function IcmpCreateFile : THandle;
stdcall;
external '
icmp.dll';
function IcmpCloseHandle (icmpHandle : THandle) : boolean;
stdcall;
external '
icmp.dll'
function IcmpSendEcho
(IcmpHandle : THandle; DestinationAddress : IPAddr;
RequestData : Pointer; RequestSize : Smallint;
RequestOptions : pointer;
ReplyBuffer : Pointer;
ReplySize : DWORD;
Timeout : DWORD) : DWORD;
stdcall;
external '
icmp.dll';
function Ping(InetAddress :
string) : boolean;
implementation
uses
WinSock;
function Fetch(
var AInput:
string;
const ADelim:
string = '
';
const ADelete: Boolean = true) :
string;
var
iPos: Integer;
begin
if ADelim = #0
then begin
// AnsiPos does not work with #0
iPos := Pos(ADelim, AInput);
end else begin
iPos := Pos(ADelim, AInput);
end;
if iPos = 0
then begin
Result := AInput;
if ADelete
then begin
AInput := '
';
end;
end else begin
result := Copy(AInput, 1, iPos - 1);
if ADelete
then begin
Delete(AInput, 1, iPos + Length(ADelim) - 1);
end;
end;
end;
procedure TranslateStringToTInAddr(AIP:
string;
var AInAddr);
var
phe: PHostEnt;
pac: PChar;
GInitData: TWSAData;
begin
WSAStartup($101, GInitData);
try
phe := GetHostByName(PChar(AIP));
if Assigned(phe)
then
begin
pac := phe^.h_addr_list^;
if Assigned(pac)
then
begin
with TIPAddr(AInAddr).S_un_b
do begin
s_b1 := Byte(pac[0]);
s_b2 := Byte(pac[1]);
s_b3 := Byte(pac[2]);
s_b4 := Byte(pac[3]);
end;
end
else
begin
raise Exception.Create('
Error getting IP from HostName');
end;
end
else
begin
raise Exception.Create('
Error getting HostName');
end;
except
FillChar(AInAddr, SizeOf(AInAddr), #0);
end;
WSACleanup;
end;
function Ping(InetAddress :
string) : boolean;
var
Handle : THandle;
InAddr : IPAddr;
DW : DWORD;
rep :
array[1..128]
of byte;
begin
result := false;
Handle := IcmpCreateFile;
if Handle = INVALID_HANDLE_VALUE
then
Exit;
TranslateStringToTInAddr(InetAddress, InAddr);
DW := IcmpSendEcho(
Handle, InAddr,
nil, 0,
nil, @rep, 128, 0);
Result := (DW <> 0);
IcmpCloseHandle(
Handle);
end;
end.