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LVM_MAPINDEXTOID message

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Maps the index of an item to a unique ID.

Parameters

wParam

The index of an item.

lParam

Must be zero.

Return value

Returns a unique ID.

Remarks

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.

To uniquely identify an item, take the index that is returned from a call such as IComponent::GetDisplayInfo and call LVM_MAPINDEXTOID. The return value is a unique ID.

Note

In a multithreaded environment, the index is only guaranteed on the thread that hosts the list-view control, not on background threads.

Note

To use this message, you must provide a manifest specifying Comclt32.dll version 6.0. For more information on manifests, see Enabling Visual Styles.

Requirements

Requirement Value
Minimum supported client
 Windows Vista [desktop apps only]
Minimum supported server
 Windows Server 2003 [desktop apps only]
Header
Commctrl.h