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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
| user32.lib
| Header File
| winuser.h
| Unicode
| WinNT
| Platform Notes
| None
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DefMDIChildProc
The DefMDIChildProc function provides default processing for any window message that the window
procedure of a multiple document interface (MDI) child window does not process.
A window message not processed by the window procedure must be passed to the DefMDIChildProc function, not to the DefWindowProc function.
LRESULT DefMDIChildProc(
HWND hWnd,
| // handle to MDI child window
| UINT uMsg,
| // message
| WPARAM wParam,
| // first message parameter
| LPARAM lParam
| // second message parameter
| );
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Parameters
hWnd
Identifies the MDI child window.
uMsg
Specifies the message to be processed.
wParam
Specifies additional message-specific information.
lParam
Specifies additional message-specific information.
Return Values
The return value specifies the result of the message processing and depends on
the message.
Remarks
The DefMDIChildProc function assumes that the parent window of the MDI child window identified by
the hWnd parameter was created with the MDICLIENT class.
When an application's window procedure does not handle a message, it typically
passes the message to the DefWindowProc function to process the message. MDI applications use the DefFrameProc and DefMDIChildProc functions instead of DefWindowProc to provide default message processing. All messages that an application would
usually pass to DefWindowProc (such as nonclient messages and the WM_SETTEXT message) should be passed to DefMDIChildProc instead. In addition, DefMDIChildProc also handles the following messages:
Message
| Response
| WM_CHILDACTIVATE
| Performs activation processing when MDI child windows are sized, moved, or
displayed. This message must be passed.
| WM_GETMINMAXINFO
| Calculates the size of a maximized MDI child window, based on the current size
of the MDI client window.
| WM_MENUCHAR
| Passes the message to the MDI frame window.
| WM_MOVE
| Recalculates MDI client scroll bars if they are present.
| WM_SETFOCUS
| Activates the child window if it is not the active MDI child window.
| WM_SIZE
| Performs operations necessary for changing the size of a window, especially
for maximizing or restoring an MDI child window. Failing to pass this message to
the DefMDIChildProc function produces highly undesirable results.
| WM_SYSCOMMAND
| Handles window menu commands: SC_NEXTWINDOW, SC_PREVWINDOW, SC_MOVE, SC_SIZE, and
SC_MAXIMIZE.
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See Also
DefFrameProc, DefWindowProc, WM_CHILDACTIVATE, WM_GETMINMAXINFO, WM_MENUCHAR, WM_MOVE, WM_SETFOCUS, WM_SETTEXT, WM_SIZE, WM_SYSCOMMAND
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