Message or event hook functions

Typedefs
typedef int(*	MSGHOOK) (void *context, HWND dst_wnd, UINT msg, WPARAM wparam, LPARAM lparam)
	Type of message hook function. More...

Functions
MG_EXPORT MSGHOOK GUIAPI	RegisterEventHookFunc (int event_type, MSGHOOK hook, void *context)
	Registers an input event message hook function. More...
static MSGHOOK GUIAPI	RegisterKeyMsgHook (void *context, MSGHOOK hook)
	Register a key message hook function. More...
static MSGHOOK GUIAPI	RegisterMouseMsgHook (void *context, MSGHOOK hook)
	Register a mouse message hook function. More...
MG_EXPORT BOOL GUIAPI	RegisterEventHookWindow (HWND hwnd, DWORD flags)
	Register an input event message hook window. More...
MG_EXPORT BOOL GUIAPI	UnregisterEventHookWindow (HWND hwnd)
	Unregister an input event message hook window. More...
MG_EXPORT HWND GUIAPI	RegisterKeyHookWindow (HWND hwnd, DWORD flag)
	Register a key message hook window. More...
MG_EXPORT HWND GUIAPI	RegisterMouseHookWindow (HWND hwnd, DWORD flag)
	Registers a mouse message hook window. More...

Detailed Description

Typedef Documentation

MSGHOOK

typedef int(* MSGHOOK)(void *context, HWND dst_wnd, UINT msg, WPARAM wparam, LPARAM lparam)

Type of message hook function.

This is the type of a message hook function.

Parameters

context	The context which was set when you registered the hook function.
dst_wnd	The handle of the original destination window of the message.
msg	The message identifier.
wparam	The first parameter of the message.
lparam	The second paramter of the message.

Returns

A value indicating stopping or continuing the subsequent handling of the message, can be one of the following values:

• HOOK_GOON
  Indicate continuing to handle the message.
• HOOK_STOP
  Indicate stopping to handle the message.

Definition at line 4026 of file window.h.

Function Documentation

RegisterEventHookFunc()

MSGHOOK GUIAPI RegisterEventHookFunc	(	int	event_type,
		MSGHOOK	hook,
		void *	context
	)

Registers an input event message hook function.

This function registers an input event message hook function pointed to by hook. When the desktop receives an input event message with the specified event type event_type, it will call the hook function first, and passes the context value to the hook as the first argument.

Parameters

event_type	Which type of event to be hooked. The value of this argument should be a one of the following values: HOOK_EVENT_KEY To hook all key events. HOOK_EVENT_MOUSE To hook all mouse events. HOOK_EVENT_EXTRA To hook all extra input events.
hook	The pointer to the hook function. This function will unregister the old hook for the specified event type if hook is NULL.
context	The context value will be passed to the hook function.

Returns

The pointer to the old hook function for the specified event type.

Note

The hook function will be called in the context of desktop or event thread. you should note the thread safety when implementing the hook function.

See also

RegisterEventHookWindow, MSGHOOK

Since 5.0.0

RegisterEventHookWindow()

BOOL GUIAPI RegisterEventHookWindow	(	HWND	hwnd,
		DWORD	flags
	)

Register an input event message hook window.

This function registers the specified window hwnd as an input event message hook window. When MiniGUI receives an input event message, it will post it to the hook window first.

Parameters

hwnd

The hook hwnd.

flags

The flags indicating the event types hooked event and whether stop or continue handling the hooked events. The value of this argument should be OR'd with one or more event types and HOOK_GOON or HOOK_STOP: HOOK_EVENT_KEY To hook all key events. HOOK_EVENT_MOUSE To hook all mouse events. HOOK_EVENT_EXTRA To hook all extra input events. HOOK_GOON Indicate continuing to handle the message. HOOK_STOP Indicate stopping to handle the message.

Returns

The handle of old hook window.

Note

This function be be called by a client of MiniGUI-Processes. For the server, you can use SetServerEventHook.

See also

UnregisterEventHookWindow

Since 5.0.0.

RegisterKeyHookWindow()

HWND GUIAPI RegisterKeyHookWindow	(	HWND	hwnd,
		DWORD	flag
	)

Register a key message hook window.

This function registers a window specified by hwnd as the key message hook window. When MiniGUI receives a key message, it will post it to the hooked window first.

Parameters

hwnd	The handle of the hook window. This function will unregister the old hook if hwnd is HWND_NULL.
flag	Indicating whether stop or continue handling the hooked messages; HOOK_GOON to continue, HOOK_STOP to stop.

Returns

The handle of old hook window.

See also

UnregisterEventHookWindow, RegisterMouseHookWindow

RegisterKeyMsgHook()

MSGHOOK GUIAPI RegisterKeyMsgHook ( void *  context, MSGHOOK  hook  )

inlinestatic

Register a key message hook function.

This function registers a key message hook pointed to by hook. When the desktop receives a key message, it will call the hook function first, and passes the context value to the hook as the first argument.

Parameters

context	The context value will be passed to the hook.
hook	The pointer to the hook function. This function will unregister the old hook if hook is NULL.

Returns

The pointer to the old hook function.

See also

RegisterEventHookFunc, MSGHOOK

Definition at line 4080 of file window.h.

RegisterMouseHookWindow()

HWND GUIAPI RegisterMouseHookWindow	(	HWND	hwnd,
		DWORD	flag
	)

Registers a mouse message hook window.

This function registers a window specified by hwnd as the mouse message hook window. When MiniGUI receives a mouse message, it will post it to the hooked window first.

Parameters

hwnd	The handle of the hook window. This function will unregister the old hook if hwnd is HWND_NULL.
flag	Indicating whether stop or continue handling the hooked messages; HOOK_GOON to continue, HOOK_STOP to stop.

Returns

The handle of old hook window.

See also

UnregisterEventHookWindow, RegisterMouseHookWindow

RegisterMouseMsgHook()

MSGHOOK GUIAPI RegisterMouseMsgHook ( void *  context, MSGHOOK  hook  )

inlinestatic

Register a mouse message hook function.

This function registers a mouse message hook pointed to by hook. When the desktop receives a mouse message, it will call the hook function first, and passes the context value to the hook as the first argument.

Parameters

context	The context value will be passed to the hook function.
hook	The pointer to the hook function. This function will unregister the old hook if hook is NULL.

Returns

The pointer to the old hook function.

See also

RegisterEventHookFunc, MSGHOOK

Definition at line 4101 of file window.h.

UnregisterEventHookWindow()

BOOL GUIAPI UnregisterEventHookWindow

(

HWND

hwnd

)

Unregister an input event message hook window.

This function unregisters the specified window hwnd from the hook list.

Parameters

hwnd	The hook hwnd.

Returns

TRUE on success, otherwise FALSE.

See also

RegisterEventHookWindow

Since 5.0.0.