Re: about CComboBox::GetItemData(int index) return value

From:
"Doug Harrison [MVP]" <dsh@mvps.org>
Newsgroups:
microsoft.public.vc.mfc
Date:
Fri, 31 Aug 2007 13:45:13 -0500
Message-ID:
<b5ogd35ce512shbal5g66n9hhbo0c4hj5b@4ax.com>
On Fri, 31 Aug 2007 11:31:11 -0700, ".rhavin grobert" <clqrq@yahoo.de>
wrote:

On 30 Aug., 00:30, "Doug Harrison [MVP]" <d...@mvps.org> wrote:

On Wed, 29 Aug 2007 21:26:17 +0200, V?clav Jedli?ka
It does kinda suck that this value is effectively forbidden for your data...


Is it?

m_ComboBox.SetItemData(m_ComboBox.AddString("Test1"), 0);
m_ComboBox.SetItemData(m_ComboBox.AddString("Test2"), -1);
m_ComboBox.SetItemData(m_ComboBox.AddString("Test3"), -2);

int a1 = m_ComboBox.GetItemData(0);
int a2 = m_ComboBox.GetItemData(1);
int a3 = m_ComboBox.GetItemData(2);

// a1 is 0, a2 is -1, a3 is -2, as expected.


Sure you can store it, but you can't retrieve it and distinguish it from
the CB_ERR return code. Another example that comes to mind involves thread
return codes, but at least MS is now documenting it properly:

GetExitCodeThread
http://msdn2.microsoft.com/en-us/library/ms683190.aspx
<q>
Warning If a thread happens to return STILL_ACTIVE (259) as an error code,
applications that test for this value could end up in an infinite loop.
</q>

--
Doug Harrison
Visual C++ MVP

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