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TVN_GETDISPINFO

TVN_GETDISPINFO 
    lptvdi = (LPNMTVDISPINFO) lParam 

Requests that a tree view control's parent window provide information needed to display or sort an item. This notification message is sent in the form of a WM_NOTIFY message.

• The return value is ignored.

lptvdi

Address of an NMTVDISPINFO structure. The item member is a TVITEM structure whose mask, hItem, state, and lParam members specify the type of information required. You must fill the members of the structure with the appropriate information.

This notification is sent under the following circumstances:

• If the pszText member of the item's TVITEM structure is the LPSTR_TEXTCALLBACK value, the control sends this notification to retrieve the item's text. In this case, the mask member of lptvdi will have the TVIF_TEXT flag set.
• If the iImage or iSelectedImage member of the item's TVITEM structure is the I_IMAGECALLBACK value, the control sends this notification to retrieve the index of an item's icons in the control's image list. In this case, if the item is selected, the mask member of lptvdi will have the TVIF_SELECTEDIMAGE flag set. If the item is not selected, the mask member of lptvdi will have the TVIF_IMAGE flag set.
• If the cChildren member of the item's TVITEM structure is the I_CHILDRENCALLBACK value, the control sends this notification to retrieve a value that indicates whether the item has child items. In this case, the mask member of lptvdi will have the TVIF_CHILDREN flag set.

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