Steema Issues Database

Note: This database is for bugs and wishes only. For technical support help, if you are a customer please visit our online forums;
otherwise you can use StackOverflow.
Before using this bug-tracker we recommend a look at this document, Steema Bug Fixing Policy.



Bug 2283 - Access violation in TFastLineSeries.Clear;
Summary: Access violation in TFastLineSeries.Clear;
Status: RESOLVED FIXED
Alias: None
Product: VCL TeeChart
Classification: Unclassified
Component: Series (show other bugs)
Version: unspecified
Hardware: PC Windows
: High regression
Target Milestone: ---
Assignee: Steema Issue Manager
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-01-24 00:38 EST by Stefan Bieringer
Modified: 2020-01-31 11:44 EST (History)
1 user (show)

See Also:
Chart Series: FastLine
Delphi / C++ Builder RAD IDE Version: RAD 10.3 Rio

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Stefan Bieringer 2020-01-24 00:38:31 EST 
I'am using verions: Build 2020.29.200113
Sorry, I don't know what I should choose in the version list above.

I think there is a bug in file "VCLTee.Series" at line 1693.

When I close my application ParentChart.Canvas could be nil.
So this should be checked bevor trying to access the Canvas.

procedure TFastLineSeries.Clear;
begin
  inherited;
  
  // original code line
  if (ParentChart <> nil) then
  // I changed to this as a bugfix 
  if (ParentChart <> nil) and (ParentChart.Canvas <> nil) then
    With ParentChart,Canvas do
    begin
        OldX := GetVertAxis.PosAxis; //LeftAxis.PosAxis;
        OldY := GetHorizAxis.PosAxis; //BottomAxis.PosAxis;
        if View3D then MoveTo3D(OldX,OldY,MiddleZ)
                  else MoveTo(OldX,OldY);
    end;
end;
Comment 1 marc meumann 2020-01-31 11:44:09 EST 
Hello Stefan,

Thanks for the feedback; we'll make the change.

Regards,
Marc