WM SHOW

This message occurs when the WS_VISIBLE state of a window is being changed.

Syntax

param1

USHORT usshow /* Show indicator. */

param2

ULONG ulReserved /* Reserved value, should be 0. */

Parameters

usshow (USHORT)

Show indicator.

TRUE

Show the window

FALSE

Hide the window.

ulReserved (ULONG)

Reserved value, should be 0.

Returns

ulReserved (ULONG)

Reserved value, should be 0.

Remarks

The message is sent after the visibility state has changed.

In this context, the terms "shown" or "hidden" refer to the state of the WS_VISIBLE style bit. This message is not sent when a window is obscured by other windows above it.

Default Processing

The default window procedure takes no action on this message, other than to set ulReserved to 0.