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Differences between Borland C++ 5.02 & 4.52

I have upgraded my Borland C++ compiler from v. 4.52 to 5.02.
But there seems to be some problems. I'm programming an MDI application,
been programming for some time, I am able to work with it only at weekends. So in this program I'm using a modal dialog box with some listboxes I want to include in transfer buffer. In older version this buffer works fine. But when compiled with newer version, it results an access violation error.

Doing it like:

struct TTransferFED {
TTransferFED();
uint Tag;
TListBoxData valt;
TListBoxData sanal;
};

TTransferFED::TTransferFED()
{
Tag=BF_CHECKED;
}

class TEDialog : public TDialog
{
public:
TEDialog(TWindow* parent,TTransferFED* trFed,TModule* module=0);
private:
TListBox* valtied;
TListBox* sanalist;
};

TEDialog::TEDialog(TWindow* parent,TTransferFED* trFed,
TModule* module)
: TDialog(parent,"Search",module)
{
valtied=new TListBox(...);
sanalist=new TListBox(..);
SetTransferBuffer(trFed);
}

and it is called:
TTransferFED trFed;

if(TEDialog(this,&trFed).Execute()==IDOK) {
...
}

The checkbox works correctly.

I don't now if there has been made some changes in class libraries or other
between these versions. I just don't have a clue about the problem.

AlexVirochovsky

Hm, it is very strange, i don't see
error in you text, but compare
with working example(of Borland), that
you can find in BC5\EXAMPES\OWL\TASKS\TRANSFER or
in my reply https://www.experts-exchange.com/jsp/qShow.jsp?ta=owl&qid=10230040 (5 pts).

JPM

When you use a TransferBuffer you must create the objects in the same order you declare them in the data struct.
what about uint Tag ?

Jean-Paul

ekinee

ASKER

I have created checkbox comparing to Tag in correct order it is only missing from my question.

JPM

Try out changing :
- constructor :
TEDialog::TEDialog( ...... TTransferFED& trFed ......

- call :
if(TEDialog( this , trFed)....

Jean-Paul

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AlexVirochovsky

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JPM

Alex , it 's funny to seeing you 've just sent the example
provided in the ../examples/owl/tasks/transfer of the BC5 directory. :))

may be the Borland team members should get the points ;-))

Jean-Paul

AlexVirochovsky

JPM:
1. See my 1-st comment (from 12.12.99)
2. I 've changed this example for
ekinee data

ekinee

ASKER

I've found that when I put both listboxes and checkbox in the buffer, it doesn't work. But when I use them separately it does work. For my wiev I create them correctly.

struct TTransferFED {
TTransferFED();
uint Tag;
TListBoxData valt;
TListBoxData sanal;
};

class TEDialog : public TDialog
{
public:
TEDialog(TWindow* parent,TTransferFED* trFed,TModule* module=0);
private:
TListBox* valtied;
TListBox* sanalist;
};

TEDialog::TEDialog(TWindow* parent,TTransferFED* trFed,
TModule* module)
: TDialog(parent,"Search",module)
{
... I also create other stuff in this part which I disable with DisableTransfer() ...
new CheckBox(...);
valtied=new TListBox(...);
sanalist=new TListBox(..);
SetTransferBuffer(trFed);
}

Changing constructor doesn't help.

AlexVirochovsky

Hi, i make ~same thing, and all works
May be:

>>new CheckBox(...); ->not !
change to
tCheckBox = new CheckBox(...);
where tCheckBox must be in class, of course.

Differences between Borland C++ 5.02 &amp; 4.52

Differences between Borland C++ 5.02 & 4.52