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Changing Exception Error Messages in Delphi

Posted on 2009-05-12
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Last Modified: 2012-05-06
How to Handle an Exception Error message in Delphi and Change the Text of this Message

such as ('' is not a floating point value) , I would like this message to appear like this to my application users (Error in Floating point conversation)... etc
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Question by:i7mad
  • 3
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5 Comments
 
LVL 37

Expert Comment

by:Geert Gruwez
ID: 24363567
first catch then reraise it

procedure Test;
begin
  try
    ShowMessage(FloatToStr(1/0));
  except
    on EZeroDivide, EDivByZero:
      Raise Exception.Create('Only dummies divide by zero !');
  end;
end;
0
 

Author Comment

by:i7mad
ID: 24363580


Geert_Gruwez:

  Thanks for your fast response.

  I want to handle it on Application level;

for example: I want to show My own message when EConvertError happen
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LVL 37

Expert Comment

by:Geert Gruwez
ID: 24363589
or analyze the exception text first and then reraise ...

procedure Test;
var Msg: string;
begin
  try
    ShowMessage(FloatToStr(1/0));
  except
    on E: Exception do
    begin
      Msg := '';
      if Pos('is not a floating point value', E.Message) > 0 then
        Msg := 'Error in Floating point conversation';
      // if  and so on
      if Msg <> '' then
        Raise Exception.Create(Msg);
    end;
  end;
end;
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LVL 37

Accepted Solution

by:
Geert Gruwez earned 500 total points
ID: 24363637
then you need to catch it at application level too
write your own exception handler:


procedure TForm1.FormCreate(Sender: TObject);
begin
  Application.OnException := AppExcept;
end;

procedure TForm1.AppExcept(Sender: TObject; E: Exception);
var Msg: string;
begin
  Msg := '';
  if Pos('is not a floating point value', E.Message) > 0 then
    Msg := 'Error in Floating point conversation';
  // if  and so on
  if Msg = '' then
    Msg := E.Message;
  MessageDlg(Msg, mtError, [mbOk], 0)
end;
0
 

Author Closing Comment

by:i7mad
ID: 31580488
Very Helpful;  Thanks alot.
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