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

Summary:	Access violation in TFastLineSeries.Clear;
Product:	VCL TeeChart	Reporter:	Stefan Bieringer <stefan.bieringer>
Component:	Series	Assignee:	Steema Issue Manager <issuemanager>
Status:	RESOLVED FIXED
Severity:	regression	CC:	marc
Priority:	High
Version:	unspecified
Target Milestone:	---
Hardware:	PC
OS:	Windows
Chart Series:	FastLine	Delphi / C++ Builder RAD IDE Version:	RAD 10.3 Rio

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