Hi everybody!! I'm using Borla

[MrProgrammer]

Hi everybody!!

I'm using Borland C++ Builder 5.0 and I have a problem!

In my project, there is a form named Form1. Its source file is Unit1.CPP and the header file is Unit1.H . In Unit1.CPP, I declared a control array like "TImage *Squares[8][8];".
Then in Form1's show event, I wrote some code like below:

void __fastcall TForm1::FormShow(TObject *Sender)
{ int i,j;
for (j=0;j<8;j++)
for (j=0;j<8;j++)
{ Squares[j] = new TImage(this);
Squares[j]->Parent = Form1;
Squares[j]->Width = 40;
Squares[j]->Height = 40;
Squares[j]->OnClick = Square_Click;
}

Square_Click is a function that I declared in Unit1.CPP. I put its prototype into Form1's class definition in the Unit1.H as below.

class TForm1 : public TForm
{
__published: // IDE-managed Components
void __fastcall FormShow(TObject *Sender);
void __fastcall Square_Click(TObject *Sender);
private: // User declarations
public: // User declarations
__fastcall TForm1(TComponent* Owner);
};

But when I compile, I'm having an error like &quot;[Linker Error] Unresolved external '__fastcall TForm1::Square_Click(System::TObject *)' referenced from Unit1.OBJ&quot;

Can you help me please???

 

[LoneRanger123]

first, when u call square_click you need to use

square_click(Sender);

also put your declarations in the public part, where it says &quot;User declarations&quot;

 

[MrProgrammer]

I tried that option but this time, another error is displayed : &quot;Can not convert 'void (__fastcall *)(TObject *)' to 'void (__fastcall *(__closure)(TObject *))(TObject *)' &quot;.

What does __closure means and why two statemes of &quot;(TObject *)&quot; are used??

 

[2ffat]

When you put square click into the header file did you include the TForm1:: part? If so, then remove it. (Just a guess, BTW.) James P. Cottingham

I am the Unknown lead by the Unknowing.
I have done so much with so little
for so long that I am now qualified
to do anything with nothing.

 

[MrProgrammer]

No, I didn't include that. But there is another point that is interesting : I have set all the Parent properties of the TImage objects that I created at runtime to Form1 and I put the prototype of the function &quot;SquareClick&quot; into the Form1's header file. But in spite of this, I'm getting the error message &quot;Call to undefined function 'SquareClick'&quot; when I didn't include the prototype also into the Unit1.CPP. Shouldn't it be seen from Unit1.CPP??