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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
| No
| Platform Notes
| None
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CallMsgFilter
The CallMsgFilter function passes the specified message and hook code to the hook procedures
associated with the WH_SYSMSGFILTER and WH_MSGFILTER hooks. A WH_SYSMSGFILTER or WH_MSGFILTER hook procedure is an
application-defined callback function that examines and, optionally, modifies messages for a
dialog box, message box, menu, or scroll bar.
BOOL CallMsgFilter(
LPMSG lpMsg,
| // pointer to structure with message data
| int nCode
| // hook code
| );
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Parameters
lpMsg
Pointer to an MSG structure that contains the message to be passed to the hook procedures.
nCode
Specifies an application-defined code used by the hook procedure to determine
how to process the message. The code must not have the same value as
system-defined hook codes (MSGF_ and HC_) associated with the WH_SYSMSGFILTER and
WH_MSGFILTER hooks.
Return Values
If the application should process the message further, the return value is
zero.
If the application should not process the message further, the return value is
nonzero.
Remarks
Windows calls CallMsgFilter to enable applications to examine and control the flow of messages during
internal processing of dialog boxes, message boxes, menus, and scroll bars, or
when the user activates a different window by pressing the ALT+TAB key combination.
An application installs a hook procedure by using the SetWindowsHookEx function.
See Also
MessageProc, MSG, SetWindowsHookEx, SysMsgProc
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Unix Manual Pages
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