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troubleshooting Question

general help needed with using freeware components (text scorller in particular)

Avatar of maidenbeast666
maidenbeast666 asked on
Delphi
4 Comments1 Solution398 ViewsLast Modified:
I am pretty new to using freeware components in delphi and I am really struggling to get a single one working.  The biggest problem is that the documentation is so sparse and assumes you have all the essential knowledge in the first place, but it's starting to bug me know.

I've been trying to use some freeware text scrollers for my about screen, because I figured it would be faster doing that then writing my own, and so far i've wasted about 3 hours getting numerous ones to work with no success.

so the one i am trying to get working now is

TbspRunningText = class(TCustomlabel)
  private
       { Private-Deklarationen }
       FBitmap: TBitmap;
       FTimer: TTimer;
       FCurCycle: Integer;
       FActive: Boolean;
       FDirection: TbspRunDirection;
       FStyleLabel: TbspRunFontStyle;
       FLayout: TbspRunTextLayout;
       FSpeed: Integer;
       FNumRepeat: Word;                   //number of repeat cycles
       FContinuous: Boolean;            // same that FNumRepeat = infinity
       FSteps: Integer;           // number of steps
       CurrentStep: Integer;      // current step when running
       FRunCaption: string;            // text to show running
       procedure SetActive(Value: Boolean);
       procedure SetDirection(Value: TbspRunDirection);
       procedure SetStyle(Value: TbspRunFontStyle);
       procedure SetSteps(Value: Integer);
       procedure SetSpeed(Value: Integer);
       procedure SetLayout(Value: TbspRunTextLayout);
  protected
       { Protected-Deklarationen }
       procedure TimerExpired(Sender: TObject);
       procedure DrawRunText;
       // hide following properties
       property Autosize;
       property WordWrap;
       property Caption;
  public
       { Public-Deklarationen }
       constructor Create(AOwner: TComponent); override;
       destructor Destroy; override;
       procedure Paint; override;


it all seems so simple yet i am missing something fatal.

var
            scroll : TbspRunningText;
begin

 scroll.create(label1);

 With Scroll do
 begin
  active := true;
  Continuous := true;
  Runningcaption := '    hello there   ';
 end;

here's pretty much what i've done.  I figure i have to create the scroll on the label i want to use and this compiles fine, accept i get an access violation message the minute i get past the create(label1) line.

This seems to be my biggest problem with all the components i try is i get an access violation.

Have i got the right idea???  can someone provide an answer?

thanks in advnace
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Avatar of mokule
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