Author: Tomas Rutkauskas

I have a form with a TDBMemo control. I also have an "Abort" button which, when 
pressed, will reset the contents of the TDBMemo control. I know that if you hit the 
escape key in a TDBMemo this will reset the contents. However, my users are used to 
hitting the Esc key to exit forms, so I disabled this feature so that they would 
not lose everything they entered. I did this by changing the value of the Key code 
in the OnKeyPress event:

1   if key = #27 then
2   begin
3     key := #0;


I have looked in the VCL and have noticed that when ESC is pressed FDataLink.Reset 
is invoked. However, this is private, so there is not way to reset the contents. Is 
there another way around this?

Answer:

All DbCtrls have a "procedure CMGetDataLink(var Message: TMessage); message 
CM_GETDATALINK;" which can be executed to return the TFieldDataLink as follows:
4   
5   procedure TForm1.SpeedButton1Click(Sender: TObject);
6   {must be TSpeedButton so Focus change does take place first}
7   var
8     fDataLink: TFieldDataLink;
9   begin
10    fDataLink := TFieldDataLink(DBMemo1.Perform(CM_GETDATALINK, 0, 0));
11    if assigned(fDataLink) then
12      fDataLink.Reset;
13  end;