LEADMARKERCALLBACK Function

#include "ltwrappr.h"

L_INT pEXT_CALLBACK YourFunction (uMarker, uMarkerSize, pMarkerData, pLEADUserData)

L_UINT uMarker;	/* ID of the JPEG marker */
L_UINT uMarkerSize;	/* size of the JPEG marker */
L_UCHAR * pMarkerData;	/* marker data */
L_VOID * pLEADUserData;	/* pointer to additional parameters */

Writes the updated marker data to the destination file.

Parameter	Description
uMarker	ID of the JPEG marker to write. The JPEG markers are uniquely identified by a byte value. Possible values are 1 to 254. (0 and 255 are not allowed.)
uMarkerSize	Size of the JPEG marker to write. The size will be less than 65535. If this value is 0, then the marker does not have any extra data.
pMarkerData	Pointer to a buffer containing the marker data. This parameter is valid only if the uMarkerSize is > 0.
pLEADUserData	Void pointer that was passed to the L_FILE::TRANSFORMFILECALLBACK function.

Returns

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

Comments

This is a callback function provided by LEADTOOLS, for writing updated marker data. Any user data required by this callback function is passed to the LFile::TransformFileCallBackfunction and is in turn passed on to this function.

This function is called only from within the LFile::TransformFileCallBack function.

Please note that this callback function is different from most other LEADTOOLS callback functions. The code for this function resides entirely within LEADTOOLS. No code for this callback function is provided by the user.