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Referencing a TObject using a string

Posted on 2004-04-30
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Last Modified: 2010-04-05
How do you reference an object (TMenuItem to be specific) in code through a string variable containing the object's name?

I need this because I want to to be setting the enable properties of the menu items in my application according to the data that will be supplied by a database.
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Question by:ziche
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3 Comments
 
LVL 27

Accepted Solution

by:
kretzschmar earned 160 total points
ID: 10956966
you can use

var
  MenuItem : TMenuItem;
begin
  menuitem := form1.findcomponent('MenuItemName') as TMenuItem;
  if assigned(MenuItem) then
    ....

meikl ;-)    
0
 
LVL 9

Expert Comment

by:Cayce
ID: 10960106
Woudn't it be easier to use the Tag property ?

Assign your TMenuItems a unique Tag value, then browse through all the TMenuItem components (use the Component and ComponentCount properties of your TForm or TMenu and then filter by the ClassName property).

PseudoCode:

function TMenuItem TForm.FindMenuItem(Tag: Integer)
begin
  Result := nil;
  for i = 1 to Form.ComponentCount
    if Form.Components[i].ClassName = "TMenuItem" then
      if Form.Components[i].Tag = LookupTag then
      begin
        Result := Form.Components[i];
        i := Form.ComponentCount;
      end;
end;
0
 

Author Comment

by:ziche
ID: 10975799
Thanks Cayce for openig my mind and reminding me of the many different ways there are for approaching problems.

This time though, I'll go with  kretzschmar's solution because of its simpler implementation.
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