setitemtext and LVN_ITEMCHANGED problem in MFC CListCtrl

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Hello all,

I have a list control on a form view. I am handling LVN_ITEMCHANGED message in form view for various reasons. In a particular case, I want to change the text of a 2nd row, 0th column, so I used setItemText() to do that. At this time, again I am receiving LVN_ITEMCHANGED message, causing a big problem(recursive call).
How can I stop this second message?

Posted 1-Feb-11 4:00am

వేంకటనారాయణ(venkatmakam)

Updated 1-Feb-11 4:09am

Sandeep Mewara

v2

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2 solutions

Solution 2

You could try checking the uChanged parameter of the message as per http://msdn.microsoft.com/en-us/library/bb774845(v=vs.85).aspx[^]

void CMyClass::OnItemChanged(NMHDR *pNMHDR, LRESULT *pResult) {
	*pResult = 1; //or =0 if you want the message to continue to be processed
	pNMLV = (LPNMLISTVIEW)pNMHDR;
	if (!(pNMLV->uChanged & LVIF_TEXT)) {
		//SetItemText();
	}
}

Im not sure if that will work, you may need to experiment with it a little and check the values of pNMLV to see what is changing between the first call and the recursive call.

Posted 1-Feb-11 4:32am

Andrew Brock

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Chris Meech 1-Feb-11 12:15pm

Good Answer. The ITEMCHANGED message can indicate many different changes. It's important to verify what is actually changing in the handler and react appropriately. It's been awhile since I've looked at list controls, but I doubt that a SetItemText call causes the message. It is more often the result of some user action.

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Henry Minute · Accepted Answer · 2011-02-01T04:22:00

Solution 1

One way to achieve your aims is to have a boolean member ('internalListChange' or similar) set it before your call to setItemText() and reset it after. Then in your message handler, right at the beginning, test for internalListChange = true and return if it is.

Posted 1-Feb-11 4:22am

Henry Minute

Updated 1-Feb-11 4:23am

v3