MdispGetHookInfo

Board	Supported
Host System	Yes
V4L2	Yes
Clarity UHD	Yes
Concord PoE	No
GenTL	Yes
GevIQ	Yes
GigE Vision	Yes
Indio	No
Iris GTX	Yes
Radient eV-CL	Yes
Rapixo CL	Yes
Rapixo CoF	Yes
Rapixo CXP	Yes
USB3 Vision	Yes

Get information about a display hook event.

Syntax

AIL_INT MdispGetHookInfo(
    AIL_ID    EventId,    //in
    AIL_INT64 InfoType,   //in
    void *    UserVarPtr  //out
)

Description

This function allows you to get information about the event that caused the hook-handler function to be called. MdispGetHookInfo should only be called within the scope of a display hook-handler function (see MdispHookFunction).

Parameters

EventId (in, AIL_ID)

Specifies the display event identifier received by the hook-handler function (see MdispHookFunction).

InfoType (in, AIL_INT64)

Specifies the type of information about the event to return.

UserVarPtr *(out, void)

Specifies the address in which to write the requested information.

Parameter Associations

For retrieving information about a general display hook event

Regardless of the display event that caused the hook-handler function to be called, the InfoType parameter can be set to the value below.

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M_DISPLAY

Retrieves the Aurora Imaging Library identifier of the display that generated the event.

Value	Description
Aurora Imaging Librarydisplay identifier	Specifies the Aurora Imaging Library identifier of the display that generated the event.

For retrieving information regarding mouse events

If the hook-handler function was called due to an M_MOUSE_... event type, the InfoType parameter can be set to one of the values below.

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M_MOUSE_POSITION_BUFFER_X

Retrieves the X-position of the cursor, in buffer coordinates.

Value	Description
Value	Specifies the X-position of the cursor, in buffer coordinates.

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M_MOUSE_POSITION_BUFFER_Y

Retrieves the Y-position of the cursor, in buffer coordinates.

Value	Description
Value	Specifies the Y-position of the cursor, in buffer coordinates.

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M_MOUSE_POSITION_X

Retrieves the X-position of the cursor, in display coordinates.

Value	Description
Value	Specifies the X-position of the cursor, in display coordinates.

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M_MOUSE_POSITION_Y

Retrieves the Y-position of the cursor, in display coordinates.

Value	Description
Value	Specifies the Y-position of the cursor, in display coordinates.

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M_MOUSE_WHEEL_VALUE

Retrieves the value for the mouse wheel's rotation. Note, this value can only be retrieved if the hook-handler function was called due to the M_MOUSE_WHEEL event.

Value	Description
Value	Specifies the value for the mouse wheel's rotation. A positive value indicates that the wheel was rotated forward, away from the user; a negative value indicates that the wheel was rotate backward, toward the user.

For retrieving information regarding keyboard events

If the hook-handler function was called due to an M_KEY_... event type, the InfoType parameter can be set to the value below.

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M_AIL_KEY_VALUE

Retrieves the Aurora Imaging Library operating system-independent key code for the keyboard key that triggered the event. Note, this value can only be retrieved if the hook-handler function was called due to theM_KEY_DOWN orM_KEY_UP event.

Value	Description
M_KEY_ADD	Specifies the Add key (+).
M_KEY_ARROW_DOWN	Specifies the Down Arrow key.
M_KEY_ARROW_LEFT	Specifies the Left Arrow key.
M_KEY_ARROW_RIGHT	Specifies the Right Arrow key.
M_KEY_ARROW_UP	Specifies the Up Arrow key.
M_KEY_BACK	Specifies the Back key.
M_KEY_CLEAR	Specifies the Clear key.
M_KEY_DECIMAL	Specifies the Period key located on your number pad.
M_KEY_DELETE	Specifies the Delete key.
M_KEY_DIVIDE	Specifies the Divide key (/).
M_KEY_END	Specifies the End key.
M_KEY_ESC	Specifies the Esc key.
M_KEY_EXECUTE	Specifies the Execute key.
M_KEY_Fn	Specifies the_n_key, where n is a value from 1 to 24.
M_KEY_HOME	Specifies the Home key.
M_KEY_INSERT	Specifies the Insert key.
M_KEY_MULTIPLY	Specifies the Multiply key (*).
M_KEY_n	Specifies the_n_key, where n is a value from 0 to 9.
M_KEY_NUM_LOCK	Specifies the Num Lock key.
M_KEY_NUMPADn	Specifies the_n_key, where n is a value from 0 to 9.
M_KEY_PAGEDOWN	Specifies the Pagedown key.
M_KEY_PAGEUP	Specifies the Pageup key.
M_KEY_PAUSE	Specifies the Pause key.
M_KEY_RETURN	Specifies the Return key (Enter).
M_KEY_SCROLL_LOCK	Specifies the Scroll Lock key.
M_KEY_SEPARATOR	Specifies the Separator key.
M_KEY_SPACE	Specifies the Space key.
M_KEY_SUBTRACT	Specifies the Subtract key (-).
M_KEY_TAB	Specifies the Tab key.
M_KEY_xxx	Specifies the letter key_xxx_, where_xxx_ can be a letter from A to Z.

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M_KEY_VALUE

Retrieves the operating system's key code for the keyboard key that triggered the event.

Value	Description
Value	Specifies the key code.

For retrieving information regarding either a mouse or keyboard event

If the hook-handler function was called due to either an M_KEY_... or M_MOUSE_... event type, the InfoType parameter can be set to the value below.

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M_COMBINATION_KEYS

Retrieves which combination keys or mouse buttons triggered the event. Note that a combination of the values below can be returned. Bitwise operators must be used to establish the specific keys or buttons pressed.

Value	Description
M_KEY_ALT	Specifies the Alt key.
M_KEY_CTRL	Specifies the Ctrl key.
M_KEY_SHIFT	Specifies the Shift key.
M_KEY_WIN	Specifies the Windows key.
M_MOUSE_LEFT_BUTTON	Specifies the left mouse button.
M_MOUSE_MIDDLE_BUTTON	Specifies the middle mouse button.
M_MOUSE_RIGHT_BUTTON	Specifies the right mouse button.

Return Value

Type: AIL_INT

The returned value is M_NULL if successful. If the operation fails, a non-null (!M_NULL) value is returned.