#include "l_bitmap.h"

L_INT pEXT_CALLBACK YourFunction(hRgn, uBorderToRemove, pBoundingRect, pUserData)

Handles each border found by L_BorderRemoveBitmap.



Windows region representing the border to be removed. It is the programmers responsibility to delete this region (using DeleteObject() when it is no longer needed).

L_UINT uBorderToRemove

Flag that indicates which border is being processed. Possible values are:

Value Meaning
BORDER_LEFT The left border is being processed.
BORDER_TOP The top border is being processed.
BORDER_RIGHT The right border is being processed.
BORDER_BOTTOM The bottom border is being processed.

PRECT pBoundingRect

Pointer to a RECT structure that contains the bounding rectangle of the border being processed.

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_BorderRemoveBitmap.)

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_REMOVE Remove the border.
SUCCESS_NOREMOVE Do not remove the border.
Otherwise An error occurred. Refer to Return Codes.


The callback is called once for each border found. It is called a maximum of four times for each call to the C API. Return SUCCESS_REMOVE to have the border removed. Return SUCCESS_NOREMOVE to leave the border unchanged. Pass any other value to abort. This value will be the return value of the L_BorderRemoveBitmap(). If flags BORDER_IMAGE_UNCHANGED and BORDER_SINGLE_REGION are being used, then the return value of the callback affects only the internal single region that contains all the changes.

Required DLLs and Libraries

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