This message maps the identifier (ID) of an item to an index.
To send this message, call the SendMessage function.
List-view controls internally track items by index. This can present problems because indexes can change during the control's lifetime.
The list-view control can tag an item with an ID when the item is created. You can use this ID to guarantee uniqueness during the lifetime of the list-view control.
If you need the index of an item after an ID is created you can call LVM_MAPIDTOINDEX with the unique ID and it returns the most current index.
|In a multithreaded environment, the index is only guaranteed on the thread that hosts the list-view control, not on background threads.|