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5-Jul-04 9:39

I have a very odd problem that made me really crazy ! Eek! | :eek:

I've an member variable in my dialog class:

public:<br />
   CArray < SomeStruct, SomeStruct > m_MrOdd;

In a function I added some values to m_MrOdd, like this:

void CMyDialog::SomeFunc1()<br />
{<br />
   m_MrOdd.Add( SomeStruct( 1, 2 ) );<br />
   m_MrOdd.Add( SomeStruct( 10, 2 ) );<br />
   m_MrOdd.Add( SomeStruct( 1, 212 ) );<br />
}

And when i want to use of values, the array show me nothing !

void CMyDialog::SomeFunc2()<br />
{<br />
   if(m_MrOdd.GetSize() == 0)<br />
      MessageBox( _T("What did you do with my array ?!!!!!!") );<br />
.<br />
.<br />
.<br />
}

I don't know what to do ... plz help me.

The intresting part is when i debug the program Poke tongue | ;-P

In Adding values, it shows that everything is ok and in using data in another function it shows there is not any value Cry | :((

Regards,
Hadi

João Paulo Figueira5-Jul-04 10:59

5-Jul-04 10:59

Is m_MrOdd the same variable? By the way, you should be declaring it as:

CArray < SomeStruct, SomeStruct& > m_MrOdd;

(the second argument is a reference type).

Regards,
João Paulo Figueira
Embedded MVP

Hadi Rezaee5-Jul-04 11:18

5-Jul-04 11:18

Hi dear João Smile | :)

And thanks alot for reply, You are the only one who helps me Smile | :)

Well, m_MrOdd is the member variable (public access) of CMyDialog class.
As you said I changed the m_MrOdd declaring to:

CArray < SomeStruct, SomeStruct& > m_MrOdd;

But I've still the problem Frown | :(

Best Regards,
Hadi

João Paulo Figueira5-Jul-04 11:32

5-Jul-04 11:32

Can you please show the definition of SomeStruct? It may be important...

Regards,
João Paulo Figueira
Embedded MVP

Hadi Rezaee5-Jul-04 11:36

5-Jul-04 11:36

It's the real structure:

struct OrderItems<br />
{<br />
	OrderItems(){}<br />
	OrderItems(int code, int count)<br />
	{<br />
		m_nCode = code;	<br />
		m_nCount = count;<br />
	}<br />
<br />
	int m_nCode;<br />
	int m_nCount;<br />
};

Best Regards,
Hadi

João Paulo Figueira5-Jul-04 11:39

5-Jul-04 11:39

This is really strange because it should be working on such a simple structure (no need for complex copy semantics). Let me think a little bit...

Regards,
João Paulo Figueira
Embedded MVP

João Paulo Figueira5-Jul-04 11:41

5-Jul-04 11:41

What is the value of GetUpperBound ?

Regards,
João Paulo Figueira
Embedded MVP

Hadi Rezaee5-Jul-04 11:51

5-Jul-04 11:51

In Adding Function (I added 2 items to array):
GetSize() is 2, and GetUpperBound() is 1

In Using Function:
GetSize() is 0, and GetUpperBound() is -1

Best Regards,
Hadi

João Paulo Figueira5-Jul-04 12:04

5-Jul-04 12:04

Are you absolutely sure that the functions are called in this order? By any chance are you not clearing the array between the calls? (this is weired)

Regards,
João Paulo Figueira
Embedded MVP

Hadi Rezaee5-Jul-04 12:08

5-Jul-04 12:08

Yes, I'm sure ...
As you can see the code is so simple, and I didn't clear any item ...

Best Regards,
Hadi

João Paulo Figueira5-Jul-04 11:51

5-Jul-04 11:51

Got it! Most of the times, we have to read MFC's source code to know whais is happening. Look:

AFX_INLINE int CArray<TYPE, ARG_TYPE>::Add(ARG_TYPE newElement)
	{ int nIndex = m_nSize;
		SetAtGrow(nIndex, newElement);
		return nIndex; }
.
.
.
template<class TYPE, class ARG_TYPE>
void CArray<TYPE, ARG_TYPE>::SetAtGrow(int nIndex, ARG_TYPE newElement)
{
	ASSERT_VALID(this);
	ASSERT(nIndex >= 0);

	if (nIndex >= m_nSize)
		SetSize(nIndex+1, -1);
	m_pData[nIndex] = newElement;
}

The code is using a reference type (ARG_TYPE) to add the objects, that you are passing as unnamed temporaries (when are these being deleted?). Try something like this:

void CMyDialog::SomeFunc1()
{
SomeStruct a(0,0);

a = SomeStruct( 1, 2 );
m_MrOdd.Add( a );

a = SomeStruct( 10, 2 );
m_MrOdd.Add( a );

a = SomeStruct( 1, 212 );
m_MrOdd.Add( a );
}

I know it looks odd, but try it.

Regards,
João Paulo Figueira
Embedded MVP

Hadi Rezaee5-Jul-04 12:04

5-Jul-04 12:04

I tried this way:

OrderItems item(0, 0);<br />
item = OrderItems( 10, 96 );<br />
m_OrderItems.Add( item );<br />
item = OrderItems( 5, 13 );<br />
m_OrderItems.Add( item );

But ...... Frown | :(

Regards,
Hadi

João Paulo Figueira5-Jul-04 12:12

5-Jul-04 12:12

Man, this is maddening! What SDK are you using?

Regards,
João Paulo Figueira
Embedded MVP

Hadi Rezaee5-Jul-04 12:16

5-Jul-04 12:16

Yes I know but what can i say ? Frown | :(

I'm using eVC++ 4.0 SP3, PPC 2003 SDK, WinCE 4.2 SDK is also installed.

PS: I just stop the project, don't know what the hell is this Frown | :(

Anyway thanks alot for your time Wink | ;)

Regards,
Hadi

Hadi Rezaee5-Jul-04 12:14

5-Jul-04 12:14

I forgot to say that i got thease warnings in compiling:

e:\windows ce tools\wce420\pocket pc 2003\mfc\include\afxtempl.h(65) : warning C4291: 'void *__cdecl operator new(unsigned int,void *)' : no matching operator delete found; memory will not be freed if initialization throws an exception<br />
        e:\windows ce tools\wce420\pocket pc 2003\mfc\include\wcealt.h(235) : see declaration of 'new'<br />
        e:\windows ce tools\wce420\pocket pc 2003\mfc\include\afxtempl.h(334) : see reference to function template instantiation 'void __cdecl ConstructElements(class OrderItems *,int)' being compiled<br />
OrderListDialog.cpp<br />
e:\windows ce tools\wce420\pocket pc 2003\mfc\include\afxtempl.h(65) : warning C4291: 'void *__cdecl operator new(unsigned int,void *)' : no matching operator delete found; memory will not be freed if initialization throws an exception<br />
        e:\windows ce tools\wce420\pocket pc 2003\mfc\include\wcealt.h(235) : see declaration of 'new'<br />
        e:\windows ce tools\wce420\pocket pc 2003\mfc\include\afxtempl.h(334) : see reference to function template instantiation 'void __cdecl ConstructElements(class OrderItems *,int)' being compiled<br />
ReportPage.cpp<br />
ShamsiDate.cpp<br />
Visitor.cpp<br />
e:\windows ce tools\wce420\pocket pc 2003\mfc\include\afxtempl.h(65) : warning C4291: 'void *__cdecl operator new(unsigned int,void *)' : no matching operator delete found; memory will not be freed if initialization throws an exception<br />
        e:\windows ce tools\wce420\pocket pc 2003\mfc\include\wcealt.h(235) : see declaration of 'new'<br />
        e:\windows ce tools\wce420\pocket pc 2003\mfc\include\afxtempl.h(334) : see reference to function template instantiation 'void __cdecl ConstructElements(class OrderItems *,int)' being compiled<br />
Generating Code...<br />
Linking...

João Paulo Figueira5-Jul-04 12:21

5-Jul-04 12:21

This may well be the source of this problem. To diagnose it, I would have to take a look at your entire project.

Regards,
João Paulo Figueira
Embedded MVP

Hadi Rezaee5-Jul-04 12:33

5-Jul-04 12:33

Here's the story:

class OrderItems<br />
{<br />
public:<br />
  OrderItems(){}<br />
  OrderItems(int code, int count)<br />
  {<br />
    m_nCode = code;	<br />
    m_nCount = count;<br />
  }<br />
<br />
  int m_nCode;<br />
  int m_nCount;<br />
};<br />
<br />
class CMainPage : public CPropertyPage<br />
{<br />
.<br />
.<br />
.<br />
  void UseOrders();  // Where we should read items.<br />
<br />
public:<br />
  CArray < OrderItems, OrderItems& > m_OrderItems;<br />
}

And somewhere, in one of CMainPage methods I show another dialog and i add the items in that:

void COrderListDialog::OnOK() <br />
{<br />
  CMainPage* dlgMain = (CMainPage*) GetParent();<br />
	<br />
  OrderItems item(0, 0);<br />
  item = OrderItems( 10, 96 );<br />
  dlgMain->m_OrderItems.Add( item );<br />
  item = OrderItems( 5, 13 );<br />
  dlgMain->m_OrderItems.Add( item );<br />
<br />
  CDialog::OnOK();<br />
}

And then when i back to Main form i call UseOrders() to read the items but the problem occrues Frown | :(

I hope it's clear ...

Regards,
Hadi

João Paulo Figueira5-Jul-04 22:50

5-Jul-04 22:50

Please make sure that this:

CMainPage* dlgMain = (CMainPage*) GetParent();

does return the pointer you want. If not, all is explained...

Regards,
João Paulo Figueira
Embedded MVP

Hadi Rezaee6-Jul-04 1:39

6-Jul-04 1:39

Yessss, That's it Big Grin | :-D

You solved the problem ! Thank you very much ! Rose | [Rose]

I changed code to this:

CAppSheet *pAppSheet = (CAppSheet *) GetParent();<br />
CMainPage *dlgMain = (CMainPage *) pAppSheet->GetPage(0);

And now it works fine ...

Best Regards,
Hadi

Hadi Rezaee5-Jul-04 21:00