CListCtrl control text call back problem

[J B 0]

Hi guys, I have a CListCtrl control inserted to my dialog app (MFC). I needed to customise the text display on the control and from Michael's suggestion (Thanks, Mr. Dunn!), I tried using LVN_GETDISPINFO message, which calls my OnGetDispInfo function. The problem is that the callback doesn't seem to get call when already using LPSTR_TEXTCALLBACK. The message map is created as below:

	ON_NOTIFY_REFLECT(LVN_GETDISPINFO, OnGetDispInfo)

and the callback function is decalred in my CMyDlg class.

	afx_msg void OnGetDispInfo(NMHDR* pNMHDR, LRESULT* pResult);

I add items to the control (m_TaskList) using the way below:

	m_TaskList.InsertItem(LVIF_TEXT|LVIF_STATE, itemCount, LPSTR_TEXTCALLBACK, LVIS_SELECTED, LVIS_SELECTED, 0, 0);

and the following callback function is never called,

void CMyDlg::OnGetDispInfo(NMHDR *pNMHDR, LRESULT *pResult)
{
	LV_DISPINFO* pDispInfo = (LV_DISPINFO*)pNMHDR;

	if (pDispInfo->item.mask & LVIF_TEXT)
		pDispInfo->item.pszText = _T("Testing");	
	*pResult = 0;
}

Can anyone spot where I have done wrong? Thanks alot

[valikac]

What change? You have to explicitly notify the list control upon a change. One example is LVM_INSERTITEM. Kuphryn

[J B 0]

Thanks for the reply Kuphryn, I'm not quite sure if I understand what you mean. In MFC, when I'm calling InsertItem() on the CListCtrl control, it euqally means sending the notification LVM_INSERTITEM to the control. Doesn't it?:confused: Thanks again.

[valikac]

You're not receiving the LVN_GETDISPINFO message, correct? I'm saying that you have to update the list control via sending its a message if you want to to make the change. Kuphryn

[J B 0]

Doesn't the call

m_TaskList.InsertItem(LVIF_TEXT|LVIF_STATE, itemCount, LPSTR_TEXTCALLBACK, LVIS_SELECTED, LVIS_SELECTED, 0, 0);

mean sending a message (LVM_INSERTITEM) to the control and update it according to specified information? LPSTR_TEXTCALLBACK tells the control the text is a callback item, so will call OnGetDispInfo() Why do I have to explicitly send message to the control again? Am I missing something? Thanks again

[Chris Richardson]

Don't use ON_NOTIFY_REFLECT. That macro would be used if you were trying to do this in a class that was derived from CListCtrl. Since you are catching this message in a dialog (I suppose, based on the name CMyDlg), use ON_NOTIFY. Good luck, Chris Richardson

[J B 0]

Thanks Chris, that works for me :-D