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Handle to Object or pointer convertion

Posted on 2004-09-16
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Last Modified: 2008-01-09
Hi there,


    Does any one know how to cast a windows handle to an object type (or get the valid pointer)
    of an existing handle. i.e. Say Delphi is open and one wants to get the menu object then access the object in memory to enable or disable menu items via code.
 
   For example the bug that Delphi has with web deployment ?? I want to write a small app to re-activate the object once it's deactivated

 cheerio
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Question by:zeroimpact
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4 Comments
 
LVL 13

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BlackTigerX earned 50 total points
ID: 12080137
in the specific case of the Delphi, there's an interface you can use in the ToolsAPI (search for that in your hard Drive)

then, the code to get a handle (actually a MainMenu component) is simple:

var
    FMainMenu: TMainMenu;
begin
  // find Delphi's main menu
  if not (Supports(BorlandIDEServices, INTAServices)) then
    Exit;
  FMainMenu := (BorlandIDEServices as INTAServices).MainMenu;
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Expert Comment

by:BlackTigerX
ID: 12080162
...and I'm not sure, but this probably needs to be inside a (delphi) package
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Expert Comment

by:carlp42
ID: 12612295
If you have the windows handle of a VCL control then you can get a pointer to the control by using FindControl() in the Controls unit.

If you have a window handle for an object that isn't part of a delphi program then I don't think this will work.  Also I don't think this will work to access a control in another process - even if you did get a valid pointer back it would access violate.

Carl
0

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