Random Errors

Posted: January 25, 2026 | Categories: Delphi

I was doing some coding this morning in Delphi and encountered the following warning in the compiler output:

doClose method hides virtual method of base type 'TCustomForm'

I recently created a local procedure called doClose that did some cleanup before the application closes and I never considered that that procedure name conflicted with something else used internally by the application.

It turns out that Delphi's Vcl.Forms.TCustomForm has a DoClose method and I created a potential conflict by using it.

I renamed my procedure to doClosingStuff and the warning went away.