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LJp2FileFormat::SaveList

Summary

Saves a list of bitmaps, to a file in any supported JPEG 2000 format.

Syntax

#include "ltwrappr.h"

L_INT EXT_FUNCTION LJp2FileFormat::SaveList(pszFile, hList, eFormat, nBitsPerPixel, nQFactor, pSaveOptions, pSaveCallBack, pUserData)

Parameters

L_TCHAR * pszFile

Character string that contains the name of the JPEG 2000 file.

L_INT 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.

L_INT nQFactor

Quality factor. This Quality Factor 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.

pSAVEFILEOPTION pSaveOptions

Pointer to optional extended save options. Pass NULL to use the default save options.

LFile::SaveFileCallBack 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.

L_VOID * 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

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

Comments

LJp2FileFormat::SaveList saves a list of bitmaps, to a file in any supported JPEG 2000 format. However, note that the JPEG 2000 part 1 (JP2) file format does not support multiple codestreams. Therefore, if eFormat passes JP2, only the first bitmap in the list will be saved. 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.

Platforms

Win32, x64.

Example

This example saves/loads bitmap list in JPEG 2000 file format

L_INT LJp2FileFormat__SaveListExample(L_UINT8 * pXMLData, L_SIZE_T uSize) 
{ 
   LJp2FileFormat Engine; 
   L_INT  nRet; 
   HBITMAPLIST hList;  
   L_JP2_XML_BOX XMLBox; 
   pL_JP2_MPEG7_BOX pMPEG7Box; 
   L_UINT uNumOfMPEG7; 
 
   /*Load an image*/ 
   nRet = Engine.ReadList(MAKE_IMAGE_PATH(TEXT("image1.jpx")),&hList,0,ORDER_BGR,NULL, NULL, NULL, NULL); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /*Read MPEG7 boxes*/ 
   nRet = Engine.GetBoxes( L_JPXB_MPEG7, (L_VOID**)&pMPEG7Box,&uNumOfMPEG7); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /*Reset all engine boxes*/ 
   nRet = Engine.ResetBoxes(); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /*Set JPX Engine Boxes*/ 
   if(uNumOfMPEG7) 
   { 
      nRet = Engine.SetBoxes(L_JPXB_MPEG7,pMPEG7Box,uNumOfMPEG7); 
      if(nRet != SUCCESS) 
         return nRet; 
   } 
 
   /*Create an XML box*/ 
   XMLBox.uStructSize = sizeof(L_JP2_XML_BOX); 
   XMLBox.pData = pXMLData; 
   XMLBox.uDataSize = uSize; 
 
   /*Set XML box of JPX engine*/ 
   nRet = Engine.SetBoxes(L_JPXB_XML,&XMLBox,1); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /*Save the image in JPx format*/ 
   nRet = Engine.SaveList(MAKE_IMAGE_PATH(TEXT("Test.jpx")), hList,LEADJP2_JPX, 24, 5,NULL, NULL, NULL); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   /*Free MPEG7 boxes*/ 
   if(uNumOfMPEG7) 
      Engine.FreeBoxes( L_JPXB_MPEG7, pMPEG7Box, uNumOfMPEG7); 
 
   LBitmapList BitmapList; 
   BitmapList.SetHandle(hList); 
 
   return SUCCESS; 
}