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TVN_KEYDOWN

TVN_KEYDOWN 
    ptvkd = (LPNMTVKEYDOWN) lParam 

Notifies a tree view control's parent window that the user pressed a key and the tree view control has the input focus. This notification message is sent in the form of a WM_NOTIFY message.

• If the wVKey member of ptvkd is a character key code, the character will be used as part of an incremental search. Return nonzero to exclude the character from the incremental search, or zero to include the character in the search. For all other keys, the return value is ignored.

ptvkd

Address of an NMTVKEYDOWN structure. The wVKey member specifies the virtual key code.

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