MDI-parent caption

How do I get caption on and MDI-child's parent window?

I've tried
TForm(myForm.Parent).Caption
but TForm(myForm.Parent) returns nil. Why?
SHouldn't a MDI-childs parent be set to the hWnd of it's MDI-parent???
dr_gonzoAsked:
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d003303Connect With a Mentor Commented:
Yo,
use this:

function TForm1.GetMDIParentCaption: string;
var
  AHandle : THandle;
  Buf     : array[0..255] of Char;
begin
  AHandle := Self.Handle;
  while Windows.GetParent(AHandle) <> 0
   do AHandle := Windows.GetParent(AHandle);
  // now AHandle is the top parent window
  GetWindowText(AHandle, Buf, 255);
  Result := String(Buf);
end;

Slash/d003303
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JaccoCommented:
TForm(myForm.Owner).Caption

Regards Jacco
0
 
buboiCommented:
MyForm.Parent returns a Twincontrol, it does not include the information about Caption. So you cast it to TForm, this TForm.Caption is nil, it's normal.

if you want to get the mainform's caption, you needn't use Parent property. In your child form unit, you add a uses clause
to allow you directly use mainform. for example:
mainform unit name:main.pas
var
   mainform:TMainForm;
.

in your child form unit file:

.
implementation
uses main;
.

// str:=TForm(MyForm.Parent).Caption;
// change to:
   str:=mainform.caption;
.

Everything will ok!





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dr_gonzoAuthor Commented:
To Jaccu:
Nop same problem the caption is by Delphi said to be ''. Read buboi's comment to see why.

To Buboi:
That's what I would have done, but I'm writing a component which need's eighter the owner's caption (if it is a non-MDI) or the owner's parent (if it is MDI) so it is impossible to use USES in this case, any other clues?
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dr_gonzoAuthor Commented:
Hmm by the way. If it was a cast-problem why don't this work:

Self.Parent

It also returns nil.
Is the property I'm looking for owner?????
I'm getting more and more confused. I thought I knew Delphi quite well.
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dr_gonzoAuthor Commented:
Yepp!
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JaccoCommented:
Two other options:

1)
Application.MainForm.Caption := 'My new caption'

2)
for iForm:=0 to Screen.FormCount-1 do
  for iChild:=0 to Screen.Forms[iForm].MDIChildCount-1 do
    if Screen.Forms[iForm].MDIChildren[iChild]=Self then
      Screen.Forms[iForm].Caption:='Hallo';

Regards Jacco
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