Your question has very little chance of being answered helpfully because the question itself is not very clear.

Is your application a native Windows application (probably so, since you say it is a Delphi app)? If so, what does it have to do with Perl?

If you want to use Perl to fill in input fields in a Delphi app and read the result of that action from yet another field, you have to provide more information on how your Delphi app is going to interact with Perl. Does your app write out the info to a file on the disk that you could read? Is there some other interprocess communication possible?