WM_DRAWITEM - Parameters

idIdentity (USHORT)

Window identifier.

The window identity of the control sending this notification message.

ulcontrolspec (ULONG)

Control-specific information.

The meaning of the control-specific information depends on the type of control. For details of each control type, refer to the appropriate section.

rc (BOOL)

Item-drawn indicator.

TRUE

The owner has drawn the item, and so the control does not draw it.
FALSE
If the item contains text and the owner does not draw the item, the owner returns this value and the control draws the item.

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