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Old 02-25-2019, 04:24 AM
SvenLittkowski SvenLittkowski is offline
Join Date: Jul 2010
Posts: 39
Default HELP: My CHAR does not like to work

Hi, all I want is to ensure that no other input can be entered into an EDIT field than numeric values. I added an OnKeyPress procedure, where I check for the ORD value of the pressed keyboard button.

My thought was, if the input is not numeric, to replace the value of the pressed keyboard button witha nothing. But it seems, theere is some thinking error, and I get the following message:
Incompatible types: char and string

And here is the source code that gives me that famous error.
procedure TAlpha.EditBalloonVolumeKeyPress(Sender: TObject; var Key: Char);
if not(ord(Key)in[48..57]) then Key:='';
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