#include "l_bitmap.h"

L_LTJP2_API L_INT EXT_FUNCTION L_Jp2ReadBox(hJp2, pszFile, eBoxType, plBox, uBoxIndex)

Reads a box of type eBoxType at uBoxIndex from the specified JPEG 2000 file.


L_HJP2 hJp2

JPEG 2000 engine handle that was created by the L_Jp2Create function.

L_TCHAR * pszFile

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


Box type. It specifies the type of the box to be read from the file.

L_VOID ** plBox

Pointer to a pointer to be updated with the box data structure.

L_UINT32 uBoxIndex

0-based box index. It specifies the box to read.


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


L_Jp2ReadBox reads a box of type eBoxType at uBoxIndex from the specified JPEG 2000 file.

If the uBoxIndex is greater than the number of boxes, the function returns: ERROR_INV_PARAMETER.

L_JP2B_RESOLUTION and L_JPXB_RESOLUTION boxes cant be read using this function. All of the engines boxes will be reset and updated with the new loaded boxes only.

You must free the allocated box by calling the L_Jp2FreeBoxes function.

Required DLLs and Libraries


Win32, x64.

See Also




This example reads an MPEG7 box stored in a JPEG 2000 file.

L_INT Jp2ReadBoxExample(L_UINT8 ** pMPEG7Data, L_SIZE_T* puSize) 
   L_HJP2 hEngine; 
   L_INT  nRet; 
   pL_JP2_MPEG7_BOX pMPEG7Box; 
   L_JP2_FILEINFO Jp2FileInfo; 
   /*Create JPEG  2000 engine handle*/ 
   hEngine = L_Jp2Create(); 
   Jp2FileInfo.uStructSize = sizeof(L_JP2_FILEINFO); 
   L_Jp2GetFileInfo(hEngine, MAKE_IMAGE_PATH(TEXT("image1.jpx")),&Jp2FileInfo); 
   if(Jp2FileInfo.MPEG7.uNumOfBoxes == 0) 
      return 0; 
   nRet = L_Jp2ReadBox(hEngine,MAKE_IMAGE_PATH(TEXT("image1.jpx")),L_JPXB_MPEG7, (L_VOID**)&pMPEG7Box,0); 
   if(nRet != SUCCESS) 
      return nRet; 
   *pMPEG7Data = (L_UINT8*)malloc(pMPEG7Box->uDataSize); 
   memcpy(*pMPEG7Data, pMPEG7Box->pData,pMPEG7Box->uDataSize); 
   *puSize = pMPEG7Box->uDataSize; 
   /*Free the read box*/ 
   L_Jp2FreeBoxes(hEngine, L_JPXB_MPEG7, pMPEG7Box, 1); 
   /*Free File Info structure*/ 
   L_Jp2FreeFileInfo(hEngine, &Jp2FileInfo); 
   /*Destroy engine handle*/ 
   return SUCCESS; 

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