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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| -
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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WM_MDIACTIVATE
An application sends the WM_MDIACTIVATE message to a multiple document
interface (MDI) client window to instruct the client window to activate a different
MDI child window. As the client window processes this message, it sends
WM_MDIACTIVATE to the child window being deactivated and to the child window being
activated.
WM_MDIACTIVATE
// Message sent to MDI client
wParam = (WPARAM) (HWND) hwndChildAct; // child to activate
lParam = 0; // not used; must be zero
// Message received by MDI child
hwndChildDeact = (HWND) wParam; // child being deactivated
hwndChildAct = (HWND) lParam; // child being activated
Parameters
In messages sent to an MDI client window:
hwndChildAct
Value of wParam. Identifies the MDI child window to be activated.
In messages received by an MDI child window:
hwndChildDeact
Value of wParam. Identifies the MDI child window being deactivated.
hwndChildAct
Value of lParam. Identifies the MDI child window being activated.
Return Values
If an application sends this message to an MDI client window, the return value
is zero. An MDI child window should return zero if it processes this message.
Remarks
An MDI child window is activated independently of the MDI frame window. When
the frame window becomes active, the child window last activated by using the
WM_MDIACTIVATE message receives the WM_NCACTIVATE message to draw an active
window frame and title bar; the child window does not receive another WM_MDIACTIVATE
message.
See Also
WM_MDIGETACTIVE, WM_MDINEXT, WM_NCACTIVATE
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