I am using a form in a DLL with a FormStyle of fsStayOnTop, but if the host
application has a reason to showmodal a dialog box, it is obscuring the DLL
form.

This is different to the situation where the form is part of the main
application.

I have tried passing the host applications TApplication and creating the DLL
form with it:

frmDLL := TfrmDLL.Create( HostApplication );  // doesn;t solve the problem

I have also tried passing the main form of the host application and setting
the DLL form's parent:

frmDLL.Parent := HostAppForm;  // now the dll form never appears

Any ideas?

Thanks,

Ian

Isn't this how it should be? If your dll form covered the modal dialog box,
you couldn't interact with the dialog (i.e. close it), and you couldn't
move the dll-hosted form to the side because the application has a modal
dialog open. I.e., you'd be locked out of the app.

(Which is quuite what happens when I open a *non* modal form from a dll. I
wish it would behave as your modal form does :)

.marek

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Possibly but it is different from the interaction betwen a stayOnTop form
and a modal dialog inside the same executable.

In any case I asked for help too soom. I found the answer at
http://www.kaposnet.hu/books/tysdelphi4/ch19/ch19.htm#Heading19

It was to pass the host's application variable to the DLL and replace the
DLL's application variable with it and create the form passing the
application.mainform:

var
  DLLProc: TApplication;

....
if not assigned(DLLApp) then begin
  DLLApp := Application;
  Application := MainApplicationPassed;
end;
frmDLL : tfrmDLL.Create( Application.MainForm )
...

Then be sure to set the DLLs application variable back during cleanups.

Ian