Typically we use the IcmpSendEcho function or a component like TIdIcmpClient to make a ping request from Delphi. Today I will show you another way to do this using the WMI (Windows Management Instrumentation).
The WMI class which allow you to make a ping request is Win32_PingStatus, to use this class you only need to pass the parameter Address value in your WQL sentence , the form of the Address parameter can be either the computer name (ACCOUNT-PC), IPv4 address (192.168.154.102), or IPv6 address (2010:836B:4179::836B:4179).
[sourcecode wraplines=”false” language=”text”]
SELECT * FROM Win32_PingStatus where Address=’www.google.com’
[/sourcecode]
Some of the advantages of use this class to make a ping is which supports IPv4 addresses and IPv6 addresses (Starting with Windows Vista) , and you can set the ping parameters in a single WQL sentence.
For example if you want send a Buffer of 64 bytes (instead of the 32 default size) and resolve the address of the host server you only need to write a sentence like this :
[sourcecode wraplines=”false” language=”text”]
SELECT * FROM Win32_PingStatus where Address=’192.168.1.221′ AND BufferSize=64 AND ResolveAddressNames=TRUE
[/sourcecode]
Now check this sample console application.
[sourcecode wraplines=”false” language=”delphi”]
program WMIPing;
{$APPTYPE CONSOLE}
uses
SysUtils,
ActiveX,
ComObj,
Variants;
function GetStatusCodeStr(statusCode:integer) : string;
begin
case statusCode of
0 : Result:=’Success’;
11001 : Result:=’Buffer Too Small’;
11002 : Result:=’Destination Net Unreachable’;
11003 : Result:=’Destination Host Unreachable’;
11004 : Result:=’Destination Protocol Unreachable’;
11005 : Result:=’Destination Port Unreachable’;
11006 : Result:=’No Resources’;
11007 : Result:=’Bad Option’;
11008 : Result:=’Hardware Error’;
11009 : Result:=’Packet Too Big’;
11010 : Result:=’Request Timed Out’;
11011 : Result:=’Bad Request’;
11012 : Result:=’Bad Route’;
11013 : Result:=’TimeToLive Expired Transit’;
11014 : Result:=’TimeToLive Expired Reassembly’;
11015 : Result:=’Parameter Problem’;
11016 : Result:=’Source Quench’;
11017 : Result:=’Option Too Big’;
11018 : Result:=’Bad Destination’;
11032 : Result:=’Negotiating IPSEC’;
11050 : Result:=’General Failure’
else
result:=’Unknow’;
end;
end;
//The form of the Address parameter can be either the computer name (wxyz1234), IPv4 address (192.168.177.124), or IPv6 address (2010:836B:4179::836B:4179).
procedure Ping(const Address:string;Retries,BufferSize:Word);
var
FSWbemLocator : OLEVariant;
FWMIService : OLEVariant;
FWbemObjectSet: OLEVariant;
FWbemObject : OLEVariant;
oEnum : IEnumvariant;
iValue : LongWord;
i : Integer;
PacketsReceived : Integer;
Minimum : Integer;
Maximum : Integer;
Average : Integer;
begin;
PacketsReceived:=0;
Minimum :=0;
Maximum :=0;
Average :=0;
Writeln(”);
Writeln(Format(‘Pinging %s with %d bytes of data:’,[Address,BufferSize]));
FSWbemLocator := CreateOleObject(‘WbemScripting.SWbemLocator’);
FWMIService := FSWbemLocator.ConnectServer(‘localhost’, ‘root\CIMV2’, ”, ”);
//FWMIService := FSWbemLocator.ConnectServer(‘192.168.52.130’, ‘root\CIMV2’, ‘user’, ‘password’);
for i := 0 to Retries-1 do
begin
FWbemObjectSet:= FWMIService.ExecQuery(Format(‘SELECT * FROM Win32_PingStatus where Address=%s AND BufferSize=%d’,[QuotedStr(Address),BufferSize]),’WQL’,0);
oEnum := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
if oEnum.Next(1, FWbemObject, iValue) = 0 then
begin
if FWbemObject.StatusCode=0 then
begin
if FWbemObject.ResponseTime>0 then
Writeln(Format(‘Reply from %s: bytes=%s time=%sms TTL=%s’,[FWbemObject.ProtocolAddress,FWbemObject.ReplySize,FWbemObject.ResponseTime,FWbemObject.TimeToLive]))
else
Writeln(Format(‘Reply from %s: bytes=%s time=<1ms TTL=%s’,[FWbemObject.ProtocolAddress,FWbemObject.ReplySize,FWbemObject.TimeToLive]));
Inc(PacketsReceived);
if FWbemObject.ResponseTime>Maximum then
Maximum:=FWbemObject.ResponseTime;
if Minimum=0 then
Minimum:=Maximum;
if FWbemObject.ResponseTime<Minimum then
Minimum:=FWbemObject.ResponseTime;
Average:=Average+FWbemObject.ResponseTime;
end
else
if not VarIsNull(FWbemObject.StatusCode) then
Writeln(Format(‘Reply from %s: %s’,[FWbemObject.ProtocolAddress,GetStatusCodeStr(FWbemObject.StatusCode)]))
else
Writeln(Format(‘Reply from %s: %s’,[Address,’Error processing request’]));
end;
FWbemObject:=Unassigned;
FWbemObjectSet:=Unassigned;
//Sleep(500);
end;
Writeln(”);
Writeln(Format(‘Ping statistics for %s:’,[Address]));
Writeln(Format(‘ Packets: Sent = %d, Received = %d, Lost = %d (%d%% loss),’,[Retries,PacketsReceived,Retries-PacketsReceived,Round((Retries-PacketsReceived)*100/Retries)]));
if PacketsReceived>0 then
begin
Writeln(‘Approximate round trip times in milli-seconds:’);
Writeln(Format(‘ Minimum = %dms, Maximum = %dms, Average = %dms’,[Minimum,Maximum,Round(Average/PacketsReceived)]));
end;
end;
begin
try
CoInitialize(nil);
try
//Ping(‘192.168.52.130’,4,32);
Ping(‘theroadtodelphi.wordpress.com’,4,32);
finally
CoUninitialize;
end;
except
on E:Exception do
Writeln(E.Classname, ‘:’, E.Message);
end;
Readln;
end.
[/sourcecode]
And the output
