Hi,

Has anybody actually noticed that MessageDlg() can define the mbHelp button as one of the displayed buttons, but can't return the mbHelp button as a result, because DialogResults() has it commented out (or rather defined as mrNone)!!

Regards,
- Graeme -

Delphi invokes the help system when a mbHelp button is pressed, so a help button does not need a return value.
That's why there is no mrHelp.

I added a comment to DialogResults.

Mattias

Mattias Gaertner wrote

Delphi invokes the help system when a mbHelp button is pressed, so a help button does not need a return value. That's why there is no mrHelp.

OK, thanks for the info.

So does LCL behave the same as VCL in this instance? Does LCL's MessageDlg() also invoke the help system? If not, wouldn't it be useful to return mrHelp, so the developer could manually invoke the help system after observing the MessageDlg() result?

Regards,
- Graeme -

The MessageDlg is supposed to be compatible with Delphi. Clicking on "Help" should not close this dialog, hence the button needs to have ModalResult = mrNone.

I don't know if we have the mechanismes to open help if "help" is clicked. Even in Delphi this (implementing help) was beyond me ...

Bart