Re: CListBox question again

From:

=?Utf-8?B?QWw=?= <Al@discussions.microsoft.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 7 Mar 2007 19:39:03 -0800

Message-ID:

<4CFAD04F-0975-4D3C-BD7B-63A728269328@microsoft.com>

This code works fine, the names show up in the CListBox and as you can see I
add the CTempName* to see if I could GetItemDataPtr, which it looks like I
could. The same pointer that went in comes out. Where the problem starts is
when I select one of the names from the list. I call the GetItemDataPtr here
and it does not come back with a pointer, looks like a null pointer. If I try
to use a pName->m_Name, I will get an error because the pointer is not
pointing at anything. I am loosing the data from when I call OnInitDialog()
to when the OnSelchangeListName(). Is there a way that I can see the data in
the CListBox during this period or if you have a better solution please let
me know. Thanks for the help!
--
Just Al

"Tom Serface" wrote:

Did you check the retrurn in pName at the top? Does it contain what you'd
expected? Did any of the strings show up in the control? Otherwise, this
looks OK at first glance. I'm assuming you did call GetDocument() or
something to fill in the m_pDoc pointer.

Tom

"Al" <Al@discussions.microsoft.com> wrote in message
news:216B61D6-B8DB-468C-AEED-D4FB03726655@microsoft.com...

CName* pName;
CName* pTempName;
for(x=0; x<Max; x++)
{
   pName = m_pDoc->m_Object.m_NameList.GetAt(x);
   c_ListNames.AddString(pName->m_Name);
   c_ListNames.SetItemDataPtr(x, pName);
   pTempName = (CNames*)c_ListNames.GetItemDataPtr(x);
}
Sorry I missed so code before. The m_NameList is a CTypedPtrArray in the
m_Object class. I see the names and the pointer changes when I
SetItemDataPtr
and gets the same pointer when I retrieve them with GetItemDataPtr. This
code
is in the OnInitailDlg() function of the dialog with the CListBox in it.
When
a name is selected in the CListBox the code in the OnSelchangeListName()
is
run where when I try to use the same method of GetItemDataPtr to retrieve
the
pointer will give me NULL.
--
Just Al

"Al" wrote:

CName* pName;
CName* pTempName;
for(x=0 x<Max; x++)
{
    c_ListNames.AddString(pName->m_Name);
    c_ListNames.SetItemDataPtr(x, pName);
    pTempName = (CNames*)c_ListPlayerNames.GetItemDataPtr(x);
}
I added the pTempName to see if I could retrieve a pointer and I am. But
when a name is selected in the ListBox, it goes to OnSelectListBox()
function
and when I try to retrieve the pointer there I get NULL
--
Just Al

"Tom Serface" wrote:

Hmmm, the Owner Draw setting shouldn't affect this (especially if set
to
false). How did you allocate the memory for the pointers you are
assigning
using the SetItemDataPtr() call? Maybe you could post a little of that
code
snippet? I'd be happy to give it a look.
Tom

"Al" <Al@discussions.microsoft.com> wrote in message
news:0BDD09A0-6A58-4057-B58A-9D5B39192293@microsoft.com...

Well I am still having a problem. When compiling there are no errors
using
the (CObject*) cast. But it does not any of the pointers that I
SetItemDataPtr when I Initialized the CListBox. The Owner Draw option
of
the
list box is set to "No" if that matters. Where do you think I am
making my
error?