CTreeCtrl check state

[Derek Lakin]

I have a CTreeCtrl with check boxes on a dialog that I need to detect when the check box has been checked/unchecked. I am currently using the following code in the OnClick event handler, but it always gives TVHT_NOWHERE: UINT uFlags = 0; CPoint point = GetCurrentMessage()->pt; ScreenToClient( &point ); HTREEITEM hItem = m_ctrlDrivers.HitTest( point, &uFlags ); if( uFlags & TVHT_ONITEMSTATEICON ) // Check box has been clicked Anyone know where I'm going wrong?

[HP]

A suggestion. Try to use the "ptDrag" member of the NM_TREEVIEW structure instead of GetCurrentMessage()->pt. There is no need to convert ptDrag to client coordinates, because it is already in client coords. If this doesn't work, using the OnLButtonDown handler instead of OnClick is a second chance. HTH Holger Persch

[Derek Lakin]

Hi Holger, Thanks for your help. I've tried your first suggestion. This only gives me TVHT_BELOW from the HitTest. As for your second suggestion, the OnLButtonDown event handler for the dialog does not get triggered when the tree control is clicked on :o( Derek.

[Derek Lakin]

I've solved the problem. The ScreenToClient call needs to be done on the control to convert the point to control coordinates, hence: UINT uFlags = 0; CPoint point = GetCurrentMessage()->pt; m_ctrlDrivers.ScreenToClient( &point ); HTREEITEM hItem = m_ctrlDrivers.HitTest( point, &uFlags ); if( uFlags & TVHT_ONITEMSTATEICON ) // Check box has been clicked Thanks for your help. Derek.