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Sat, Apr 28 2012 10:06 PM | Permanent Link |
Rick | Hi Tim.
It appears that there is no accessibility to the global form variable from procedures called via the form's OnCreate event. Consider the following code: type TForm1 = class(TForm) procedure Form1Create(Sender: TObject); private { Private declarations } procedure CallMe; public { Public declarations } end; var Form1: TForm1; implementation procedure TForm1.CallMe; begin Form1.Left:=50; end; procedure TForm1.Form1Create(Sender: TObject); begin CallMe; end; Note that the application is newly created and the main form is auto-created. When this is run the application fails and the following error message appears in a popup: Application Error 'unit1_form1' is null or not an object Line: 12547 If I remove the Form1. qualifier from the Left property in the CallMe procedure then the application runs correctly and the form is positioned as specified. -- Rick Attachments: formvariable.jpg |
Sun, Apr 29 2012 12:49 PM | Permanent Link |
Tim Young [Elevate Software] Elevate Software, Inc. ![]() | Rick,
<< It appears that there is no accessibility to the global form variable from procedures called via the form's OnCreate event. >> That is correct - the form variable won't be assigned until the constructor is complete. You have to simply reference the form properties directly. -- Tim Young Elevate Software www.elevatesoft.com |
Sun, Apr 29 2012 9:39 PM | Permanent Link |
Rick | "Tim Young [Elevate Software]" <timyoung@elevatesoft.com> wrote in message
news:3735738D-2E86-4F3C-B28A-CDD62459514A@news.elevatesoft.com... > > << It appears that there is no accessibility to the global form variable > from procedures called via the form's OnCreate event. >> > > That is correct - the form variable won't be assigned until the > constructor is complete. You have to simply reference the form properties > directly. > > OK, I guess I was expecting it to function in a similar fashion to Delphi where this type of construct is permitted. Probably because Delphi creates the main form via Application.CreateForm rather than just a straight Create like EWB. I imagine that a lot of this will be covered in the documentation so I'll try and not bother you any more until the product is released. Hard not to be enthusiastic about it because it such a great tool - I really hope you do very well out of it. Thanks. -- Rick |
Thu, May 3 2012 9:01 AM | Permanent Link |
Tim Young [Elevate Software] Elevate Software, Inc. ![]() | Rick,
<< OK, I guess I was expecting it to function in a similar fashion to Delphi where this type of construct is permitted. Probably because Delphi creates the main form via Application.CreateForm rather than just a straight Create like EWB. >> Yes, that is the crux of the issue - there isn't support for class types or variable parameters in EWB. << I imagine that a lot of this will be covered in the documentation so I'll try and not bother you any more until the product is released. Hard not to be enthusiastic about it because it such a great tool - I really hope you do very well out of it. >> Thanks. ![]() ask/post. It's really just the "how do I do this" type of thing that I would prefer everyone to wait for the docs before asking. Tim Young Elevate Software www.elevatesoft.com |
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