Hello Aldevinas,

You can usually use this to check if record consists of data or not.

Example:

procedure TestProcedure(record MailVc Mailr)
begin


if (ReadFirstMain(Mailr,0,true)==false) then begin
goto LTestProcedure;

end;

// do something

LTestProcedure:;
return;
end;

What this function does is that it receives MailVc as a parameter and then checks if there is some data in it. Since we are not trying to reload MailVc but rather just check if there is something in it, we use index '0'. This would return TRUE if there is some data and FALSE if MailVc is empty.

I hope this is clear, let me know if I can assist you with anything else.

Best Regards,
David D.

HI Aldevinas

please let me know if this has resolved the issue and we can close this job.

Thanks

Swati 2020.9.10

Original question was "What this code is supposed to do if we specify zero keys?" as it is in this case.

Hi Aldevinas,

Like I explained in first reply, specifying zero keys is only used when checking if a record was already loaded or not. If record was loaded then ReadFirstMain returns true otherwise it returns false.

Usually when you are trying to load record from register, you would specify key value and number of keys/indexes in ReadFirstMain which is not the case in this example.

I hope that cleared it out.

Best regards,
David D.

Hi Aldevinas,

Thank you for your feedback.

Best regards,
David D.