Re: A Problem with CListCtrl::SetItemData
"Landon" <Landon@discussions.microsoft.com> ha scritto nel messaggio
I need to use CListCtrl::SetItemData method but I have a little problem
I use it like this:
CHistory* pHistory = CreateHistoryItem();
idx = 10;
m_lst_data.SetItemData( idx, pHistory );
CHistory is my own created class.
The problem was: when I tried to select that item which was set using
SetItemData, a runtime error occured.
I have tried to cast it to ( DWORD )pHistory but it also did not work.
I would suggest to check the return value of .SetItemData() call, to see if
was successful (it is a BOOL).
At least a VERIFY( m_lst_data.SetItemData( ... ) ) should be fine in debug
Moreover, are you sure that the CHistory instance is allocated on the heap
I don't know the body of CreateHistoryItem(), but if it is for example:
CHistory * CreateHistoryItem()
that is wrong because 'something' is a local variable with stack allocation,
and it disappears after function body end.
Moreover, are you sure that you retrieve the CHistory * pointer correctly
with GetItemData() ? Is the index passed to GetItemData() correct?
For me, it is hard to diagnose using just the above code fragment...
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