WM_SHOWWINDOW
This message is sent when a window is to be hidden or shown. A window is hidden or shown when the ShowWindow function is called; when an overlapped window is maximized or restored; or when an overlapped or pop-up window is closed (made iconic) or opened (displayed on the screen). When an overlapped window is closed, all pop-up windows associated with that window are hidden.
| wParam |
Specifies whether a window is being shown. It is nonzero if the window is being shown. It is zero if the window is being hidden. |
|
| lParam |
Specifies the status of the window being shown. It is zero if the message is sent because of a ShowWindow function call. Otherwise, the lParam parameter is one of the following values: |
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| Parameter |
Description |
|
| |
Value |
Meaning |
| |
SW_PARENTCLOSING |
Parent window is closing (being made iconic) or a pop-up window is being hidden. |
| |
SW_PARENTOPENING |
Parent window is opening (being displayed) or a pop-up window is being shown. |
Default Action
The DefWindowProc function hides or shows the window as specified by the message.