Thanks, looks like I will...
From: [email protected] [mailto:[email protected]] On Behalf Of Kyley Harris Sent: Monday, 16 July 2012 6:07 p.m. To: NZ Borland Developers Group - Delphi List Subject: Re: [DUG] Creating an object at run time. They dont need to. DFM use read component and you pass an existing instance.. ie TFORM as the top layer. it then uses the runtime information of the instance to stream the data. ie.. a button on the form as a property has runtime information, but its not registered with GetClass.. the only difference is that you need global lookup. the class info is in memory, just not in the lookup list. Have fun. On Mon, Jul 16, 2012 at 5:45 PM, David O'Brien <[email protected]> wrote: Thanks, Oh well... I understand, but I don't really know what classes will be used, guess I'll just have to register everything L. I would have thought the standard VCL controls would have been sorted though... From: [email protected] [mailto:[email protected]] On Behalf Of Kyley Harris Sent: Monday, 16 July 2012 5:35 p.m. To: NZ Borland Developers Group - Delphi List Subject: Re: [DUG] Creating an object at run time. David, a basic test on a blank form shows that the following code doesn't work unless registerclass is called first (of course you'd only do this 1 time). clearly they are not registering these classes by default for streaming. you will probably find that the Delphi IDE registers them all internally for DFM creation, but they haven't done it by default for end runtime code. begin RegisterClass(TButton); with TComponentClass(FindClass('TButton')).Create(self) as tbutton do begin top := 10; left := 10; caption := 'hello'; width := 100; parent := self; end; On Mon, Jul 16, 2012 at 12:41 PM, David O'Brien <[email protected]> wrote: Very frustrating, I'm getting "Class TButton not Found" with the below code. Everything in the uses clause is correct: I have a Tbutton on the form at design time. The form is in a .bpl if that will make a difference? // Simplified... Uses ..., StdCtrls, ... Var o: TComponent ; ot: String ; begin ot := 'TButton' ; o := TComponentClass(FindClass(ot)).Create(nil); <--- Class TButton Not Found end ; -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Martin Sent: Friday, 13 July 2012 4:27 p.m. To: NZ Borland Developers Group - Delphi List Subject: Re: [DUG] Creating an object at run time. b := TComponentClass(FindClass('TButton')).Create(nil); propinfo := GetPropInfo(b.classinfo,'left'); SetOrdProp(b,propinfo,100); > I want to create an object at runtime given a string with the object type. Is this possible or do I need to do a whole pile of if then else's? There is a limited number of different objects that need to be created. I then want to access the created objects properties by name and assign methods. > > This is not for oleobjects, but VCL controls. > > i.e. > b := CreateObject('TButton') ; > b.GetField('left') := 100 ; > ... > > Help on any of these would be appreciated. > > Cheers, > Dave. > > > _______________________________________________ > NZ Borland Developers Group - Delphi mailing list > Post: [email protected] > Admin: http://delphi.org.nz/mailman/listinfo/delphi > Unsubscribe: send an email to [email protected] > with Subject: unsubscribe _______________________________________________ NZ Borland Developers Group - Delphi mailing list Post: [email protected] Admin: http://delphi.org.nz/mailman/listinfo/delphi Unsubscribe: send an email to [email protected] with Subject: unsubscribe _______________________________________________ NZ Borland Developers Group - Delphi mailing list Post: [email protected] Admin: http://delphi.org.nz/mailman/listinfo/delphi Unsubscribe: send an email to [email protected] with Subject: unsubscribe -- Kyley Harris Harris Software +64-21-671-821 _______________________________________________ NZ Borland Developers Group - Delphi mailing list Post: [email protected] Admin: http://delphi.org.nz/mailman/listinfo/delphi Unsubscribe: send an email to [email protected] with Subject: unsubscribe -- Kyley Harris Harris Software +64-21-671-821
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