The WM_SHOWWINDOW message is sent to a window when the window is about to be
hidden or shown.
fShow = (BOOL) wParam; // show/hide flag
fnStatus = (int) lParam; // status flag
Value of wParam
. Specifies whether a window is being shown. It is TRUE if the window is being
shown or FALSE if the window is being hidden.
Value of lParam
. Specifies the status of the window being shown. The fnStatus
parameter is zero if the message is sent because of a call to the ShowWindow
function; otherwise, fnStatus
is one of the following values:
||Window is being uncovered because a maximize window was restored or minimized.
||Window is being covered by another window that has been maximized.
||Window's owner window is being minimized.
||Window's owner window is being restored.
If an application processes this message, it should return zero.
function hides or shows the window, as specified by the message.
If a window has the WS_VISIBLE style when it is created, the window receives
this message after it is created, but before it is displayed. A window also
receives this message when its visibility state is changed by the ShowWindow
The WM_SHOWWINDOW message is not sent under the following circumstances:
- When a top-level, overlapped window is created with the WS_MAXIMIZE or
- When the SW_SHOWNORMAL flag is specified in the call to the ShowWindow function.
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