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LVM_MAPIDTOINDEX message

  • Artikkeli

Maps the ID of an item to an index.

Parameters

wParam

The unique ID of an item.

lParam

Must be zero.

Return value

Returns the most current index.

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.

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.

LVM_MAPIDTOINDEX is not supported under the LVS_OWNERDATA style.

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