How to check if port is usable in Inno Setup? - inno-setup

Question

I need to check some port is usable or not? How can do that in Inno Setup?
Is there any way to use socket in to Inno Setup? Is there any library for this? If there how can import it and use it?
Thank you for your answers.

Answer 1

You can use my function to check, if a port is available:
function CheckPortOccupied(Port:String):Boolean;
var
ResultCode: Integer;
begin
Exec(ExpandConstant('{cmd}'), '/C netstat -na | findstr'+' /C:":'+Port+' "', '', 0,
ewWaitUntilTerminated, ResultCode);
if ResultCode <> 1 then
begin
Log('this port('+Port+') is occupied');
Result := True;
end
else
begin
Result := False;
end;
end;

Answer 2

Function to return (in MsgBox) service or program that use port 80.
MsgBox will not shown if output is empty.
function NextButtonClick(CurPage: Integer): Boolean;
var
TmpFileName, ExecStdout: string;
ResultCode: integer;
begin
if CurPage = wpWelcome then
begin
TmpFileName := ExpandConstant('{tmp}') + '\~pid.txt';
Exec('cmd.exe',
'/C FOR /F "usebackq tokens=5 delims= " %i IN (`netstat -ano ^|find "0.0:80"`) DO '
+ '#tasklist /fi "pid eq %i" | find "%i" > "' + TmpFileName + '"', '', SW_HIDE,
ewWaitUntilTerminated, ResultCode);
if LoadStringFromFile(TmpFileName, ExecStdout) then
begin
MsgBox('Port 80 is used by '#13 + ExecStdout, mbInformation, MB_OK);
end;
DeleteFile(TmpFileName);
end;
Result := True;
end;