LM_SELECTITEM - Parameters

sItemIndex (SHORT)

Index of the item to be selected or deselected:

LIT_NONE

All items are to be deselected
Other
Index of the item to be selected or deselected.

usselect (USHORT)

Select flag.

(Ignored if sItemIndex is set to LIT_NONE).

TRUE

The item is selected. If the control is a single selection list box (that is, it does not have the style of LS_MULTIPLESEL), any previously selected item is deselected.
FALSE
The item is deselected.

rc (BOOL)

Success indicator.

TRUE

Successful completion
FALSE
Error occurred. For example, when the item does not exist in the list box, or when an item that is not selected is deselected.

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