LJp2FileFormat::SaveMemory

#include "ltwrappr.h"

L_INT LJp2FileFormat::SaveMemory(lpBuffer, puBufferSize, pBitmap, eFormat, nBitsPerPixel, nQFactor, pSaveOptions, pSaveCallBack, pUserData)

L_UINT8 ** lpBuffer;	/* pointer to pointer */
L_SIZE_T *puBufferSize;	/* pointer to a variable to be updated*/
pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
eJP2FILEFORMAT eFormat;	/* output file format */
L_INT nBitsPerPixel;	/* resulting files pixel depth */
L_INT nQFactor;	/* quality factor */
pSAVEFILEOPTION pSaveOptions;	/* pointer to optional extended save options */
LFile::SaveFileCallBack pSaveCallBack;	/* optional callback function */
L_VOID * pUserData;	/* pointer to more parameters for the callback */

Creates a file in memory in any of the supported JPEG 2000 file formats.

Parameter	Description
lpBuffer	Pointer to a memory buffer pointer that will be updated with a new memory buffer pointer that contains the saved image. You must free this buffer by calling the Windows LocalFree() function.
puBufferSize	Address of a variable to be updated with the size of the memory buffer in bytes.
pBitmap	Pointer to the bitmap handle that describes the data to be saved.
eFormat	Output JPEG 2000 file format.
nBitsPerPixel	Resulting files pixel depth. Possible values are: 8, 12, 16, 24, 32, 48, 64, and 0. Zero [0] means that each bitmap will be saved with its bits per pixel value, if that value is equal to one of the possible values (8, 12, 16, 24, 32, 48, or 64). If it is not one of the possible values, it will return: ERROR_J2K_UNSUPPORTED.
nQFactor	Quality factor. This value determines the degree of loss in the compression process. Possible values are from 0 to 255. Zero (0) represents lossless compression. Values between 1 and 255 are interpreted as a compression ratio.
pSaveOptions	Pointer to optional extended save options. Pass NULL to use the default save options.
pSaveCallBack	Optional callback function for additional processing.
	If you do not provide a callback function, pass NULL.
	If you provide a callback function, use the function pointer as the value of this parameter.
	The callback function must adhere to the syntax described in LFile::SaveFileCallBack.
pUserData	Void pointer you can use to pass one or more additional parameters used by the callback function.
	To use this feature, assign a value to a variable or create a structure that contains as many fields as you need. Then, in this parameter, pass the address of the variable or structure, casting it to L_VOID . The callback function, which receives the address in its own pUserData* parameter, can cast it to a pointer of the appropriate data type to access your variable or structure.
	If additional parameters are not needed, pass NULL.

Returns

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

Comments

LJp2FileFormat::SaveMemory creates a file in memory in any of the supported JPEG 2000 file formats. All of the currently-set engines boxes will also be saved in this file.

Required DLLs and Libraries

LTJP2
LFJ2K
LTIMGEFX

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

See Also

Functions:	LJp2FileFormat::Read, LJp2FileFormat::ReadList, LJp2FileFormat::ReadComposite, LJp2FileFormat::ReadFrames, LJp2FileFormat::Save, LJp2FileFormat::SaveList, LJp2FileFormat::SaveComposite, LJp2FileFormat::AppendFrames, LJp2FileFormat::ReadMemory, LJp2FileFormat::ReadListMemory, LJp2FileFormat::ReadCompositeMemory, LJp2FileFormat::ReadFramesMemory, LJp2FileFormat::SaveListMemory, LJp2FileFormat::SaveCompositeMemory, LJp2FileFormat::AppendFramesMemory, LBitmapList::Save
Topics:	Implementing JPEG 2000 Plug in Features
	Raster Image Functions: Working with JPEG 2000

Example

This example saves/loads bitmap in JPEG 2000 file format

L_LTJP2SAM_CLIB L_INT LJp2FileFormat__SaveMemoryExample(pBITMAPHANDLE pBitmap, L_UINT8 * pXMLData, L_SIZE_T uSize)
{
   LJp2FileFormat Engine;
   L_INT  nRet;
   L_JP2_XML_BOX XMLBox;
   L_UINT8* pFileBuffer;
   L_SIZE_T uFileSize;
   /*Create an XML box*/
   XMLBox.uStructSize = sizeof(L_JP2_XML_BOX);
   XMLBox.pData = pXMLData;
   XMLBox.uDataSize = uSize;
   /*Set XML box of JPX engine*/
   Engine.SetBoxes(L_JPXB_XML,&XMLBox,1);
   /*Save the image in JPx format*/
   nRet = Engine.SaveMemory(&pFileBuffer, &uFileSize, pBitmap,LEADJP2_JPX, 24, 5,NULL, NULL, NULL);
   if(nRet != SUCCESS)
      return nRet;
   L_FreeBitmap(pBitmap);
   /*Load the saved image*/
   nRet = Engine.ReadMemory(pFileBuffer, uFileSize,pBitmap,0,ORDER_BGR,NULL, NULL, NULL, NULL);
   if(nRet != SUCCESS)
      return nRet;
   GlobalFree(pFileBuffer);
   return SUCCESS;
}