How can I disable key presses?

Applies To: C++Builder 1 or higher
Category: Knowledge Base

I want to disable the 'a' key when entering data in an edit box. How?

 

1.

  Start a new project using File | New Application.

 

2.

  Add an Edit and double-click the OnKeyPress event:

 

void __fastcall TForm1::Edit1KeyPress(TObject *Sender, char &Key)

{

    if(Key == 'a')

        Key = 0;

}

 

The Key parameter is not read-only and you can change its value. Setting Key to 0 disables the key press.

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