[ErmandoFerrari]

I try to inherit a component from TsPanel, but the result is a linker error:

[Linker Error] Unresolved external '__fastcall Spanel::TsPanel::PaintWindow(void *)' referenced from C:testMYPANEL.OBJ
[Linker Error] Unresolved external '__fastcall Spanel::TsPanel::OurPaint(void *, bool)' referenced from C:testMYPANEL.OBJ
[Linker Error] Unresolved external '__fastcall Spanel::TsPanel::WriteText(const Types::TRect&, Graphics::TCanvas *, void *)' referenced from C:testMYPANEL.OBJ

any idea?

Thank you

[ErmandoFerrari]

I am using BCB6

[Support]

I'm sorry, I haven't big experience in work with Builder, but I think, you have a standard error of modules linking.
You have searched “Unresolved external” in the Net?
Some links :
http://www.youtube.com/watch?v=gbRcZho2SvY
http://bytes.com/topic/c/answers/512820-li…-builder-2006-a
http://webcache.googleusercontent.com/sear…;client=firefox

[ErmandoFerrari]

of course is a link error, that mean that the function is defined (in header) but not implemented in library
I haven't experience with delphi but having a look in sPanel.pas I havn't find the implementation of that functions… look like the “pure virtual” functions in C++

For now I have implemented the functions in my inherited class:

class PACKAGE TMyPanel : public TsPanel
{
…
protected:
virtual void __fastcall PaintWindow(void* hdc){TPanel::PaintWindow(hdc);};
virtual void __fastcall OurPaint(void *hdc,bool){TPanel::PaintWindow(hdc);};
virtual void __fastcall WriteText(const Types::TRect &R, Graphics::TCanvas* aCanvas = (Graphics::TCanvas*)(0x0), HDC aDC = (HDC)(0x0)){};
…
}

it's work, but my panel don't skin…

My task is to create a component that “aggregate” other control ( a button, a treeview and a memo) into a single component, so I derived a TsPanel and dynamically create the tree components inside it. If you have a better idea for a base class other than TsPanel (possibly transparent) my problem it solved

#42365

[Support]

QUOTE (ErmandoFerrari @ Apr 27 2010, 04:37 PM) <{POST_SNAPBACK}>

I haven't experience with delphi but having a look in sPanel.pas I havn't find the implementation of that functions… look like the “pure virtual” functions in C++

No, implementation of these functions is existing there..
PaintWindow implemented in the line №265
OurPaint – 164
WriteText – 474

[ErmandoFerrari]

DONE!!!

#42429

[Support]

Hello
Thank you for researching, this topic will be moved to “tricks” soon. I think, your information will be useful for others.

[Author]

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