ILMScrCapUserCallback Interface

This is a user callback interface that should be implemented and registered using SetCallbackObject method of the ILMScrCap interface.

Interface Methods:

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HRESULT RegionDataProc (long lLeft, long lTop, long lRight, long lBottom, long pUserData)

Parameters

lLeft	left border of the selected region in screen coordinates.
lTop	top border of the selected region in screen coordinates.
lRight	right border of the selected region in screen coordinates.
lBottom	bottom border of the selected region in screen coordinates.
pUserData	pointer to user-defined data passed to the SetCallbackObject method of the ILMScrCap interface.

Description

The Screen Capture filter calls this method when the region selection tool is active, to report region selection. It is called only when the user releases the left button of the mouse indicating the end of region selection.

For more information on selecting a region, refer to the SelectRegionTool method of the ILMScrCap interface.

Return

S_OK if successful, S_FALSE otherwise.

HRESULT WindowDataProc (long lWindow, WindowSelectStatusConstants WindowStatus, long pUserData)

Parameters

lWindow	the window handle of the window under the mouse cursor.
WindowStatus	a constant that specifies the event for which the method is called. Possible values are:
	WINDOW_SELECT_STATUS_UPDATE	The mouse is moved over a new window.
	WINDOW_SELECT_STATUS_SELECTED	The left button is pressed; the selection is done.
	WINDOW_SELECT_STATUS_CANCELED	The selection process is cancelled. The selection process can be cancelled by pressing the Esc key.
pUserData	pointer to user-defined data passed to the SetCallbackObject method of the ILMScrCap interface.

Description

The filter will call this method while the window selection tool is active, to report window selection events. This method will be called in the following situations:

1.	When the mouse moves, provided that the window under the cursor is different from the previously reported window.
2.	When the selection process is cancelled. The selection process can be cancelled by pressing the Esc key.
3.	When the selection process is concluded, by pressing the left button of the mouse.

Return

S_OK if successful, S_FALSE otherwise.

HRESULT NotifyCallbackProc (NotifyCallbackConstants NotifyCallback, long pUserData)

Parameters

NotifyCallback	constant that indicates the event for which this method was called. Possible values are:
	Value	Meaning
	NOTIFY_CLOSE	The window (capture source) has been closed.
	NOTIFY_MINIMIZE	The window (capture source) has been minimized.
	NOTIFY_AREACHANGE	The capture area of the window has been changed; this happens if the window was resized or the visible area was changed.
	NOTIFY_CAPWIDTH_EXCEEDED_LIMIT	The selected region width exceeded the values in LowerWidthLimit or/and UpperWidthLimit properties.
	NOTIFY_CAPHEIGHT_EXCEEDED_LIMIT	The selected region height exceeded the values in LowerHeightLimit or/and UpperHeightLimit properties.
pUserData	pointer to user-defined data passed to the SetCallbackObject method of the ILMScrCap interface.

Description

The filter will call this method when the capture source window is closed, minimized, changed or the selected region dimensions exceeded the lower/upper width/height values.

Return

S_OK if successful, S_FALSE otherwise.