#include "l_bitmap.h"

L_INT pEXT_CALLBACK YourFunction(hCellWnd, hRgn, nCellIndex, nSubCellIndex, uOperation, pUserData)

This callback is called every time the user creates, changes or removes a region from one of the bitmaps displayed in a cell.


L_HWND hCellWnd

A handle to the window that represents the Medical Viewer Cell.


Handle to the Windows region.

L_INT nCellIndex

A zero-based index of the cell that contains the tag to be deleted. Pass -2 to delete the tag of the specific information in all selected cells in the container.

L_INT nSubCellIndex

A zero-based index of the sub-cell. This sub-cell contains the image that contains the region changed. Pass -2 to refer to the selected sub-cell.

L_UINT uOperation

The action to take regarding the existing bitmap region, if one is defined. It can be one of the following value:

Value Meaning
L_RGN_AND [0] An AND operation has been applied to the existing region.
L_RGN_SET [1] A new region has been created.
L_RGN_ANDNOTRGN [3] The existing region has been reduced.
L_RGN_OR [4] A new region has been combined with the existing one.
L_RGN_SETNOT [6] An inverted region has been created.
L_RGN_REMOVE [8] The existing region has been removed.

L_VOID * pUserData

A void pointer that you can use to access a variable or structure containing data that your callback function needs. This gives you a way to receive data indirectly from the function that uses this callback function. (This is the same pointer that you pass in the pUserData parameter of L_DispContainerSetRegionCallBack.) Keep in mind that this is a void pointer, which must be cast to the appropriate data type within your callback function.


Value Meaning
SUCCESS The function was successful.
< 1 An error occurred. Refer to Return Codes.


To get the region callback, use L_DispContainerGetRegionCallBack. To set the region callback, use L_DispContainerSetRegionCallBack.

Required DLLs and Libraries

Help Version 21.0.2021.4.7
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