L_ReadFileExtensions

#include "l_bitmap.h"

L_LTFIL_API L_INT L_ReadFileExtensions(pszFile, ppExtensionList, pLoadOptions)

Loads extensions from the specified Exif file. Please note that not all Exif files have extensions.

Returns

Comments

Currently, this function works only with Exif files. Exif files can contain extra data stored as "FlashPix extensions". This function can be used to access this extra data. LEADTOOLS refers to this extra data as "extensions".

The L_LoadExtensionStamp function can be used to load a stamp from the extension and L_GetExtensionAudio can be used to get embedded audio data.

When the memory allocated by this function is no longer needed, call L_FreeExtensions to free the memory.

Required DLLs and Libraries

Platforms

Windows 2000 / XP/Vista, Windows CE.

See Also

Example

 L_INT ReadFileExtensionsExample(HWND hWnd, L_TCHAR * pszName)
{
   pEXTENSIONLIST pExtensionList;
   L_INT nRet;
   L_UINT u;
   L_CHAR aName[100];
   L_TCHAR aCLSID[50];
   FILE* fd;
   L_TCHAR szMsg[80];
   L_TCHAR s[800];

   nRet = L_ReadFileExtensions(pszName, &pExtensionList, NULL);
   if(nRet != SUCCESS)
   {
      wsprintf(szMsg, TEXT("Error %d getting extensions!"), nRet);
      MessageBox(hWnd, szMsg, TEXT("ERROR"), MB_OK);
      return nRet;
   }

   _tfopen_s(&fd, TEXT("%UserProfile%\\My Documents\\LEADTOOLS Images\\temp\\1.txt"), TEXT("w+"));
   if(!fd)
   {
      wsprintf(szMsg, TEXT("Error %d getting extensions!"), nRet);
      MessageBox(hWnd, szMsg, TEXT("ERROR"), MB_OK);
      return nRet;
   }

   // display whether we have a stamp, audio or both
   switch(pExtensionList->uFlags & (EXTENSION_STAMP|EXTENSION_AUDIO))
   {
   case 0:
      lstrcpy(s, TEXT("")); break;
   case EXTENSION_STAMP:
      lstrcpy(s, TEXT(", EXTENSION_STAMP")); break;
   case EXTENSION_AUDIO:
      lstrcpy(s, TEXT(", EXTENSION_AUDIO")); break;
   case EXTENSION_STAMP|EXTENSION_AUDIO:
      lstrcpy(s, TEXT(", EXTENSION_STAMP|EXTENSION_AUDIO")); break;
   }
   fprintf(fd, "Extension count: %d%s\n", pExtensionList->uCount, s);

   for(u = 0; u < pExtensionList->uCount; u++)
   {
      // translate the Unicode string to multibyte
      if( !WideCharToMultiByte(CP_ACP,       // code page
                        0,                   // performance and mapping flags
                        pExtensionList->aList[u].pName,    // wide-character string
                        -1,                  // number of chars in string
                        aName,               // buffer for new string
                        sizeof(aName),       // size of buffer
                        NULL,                // default for unmappable chars
                        NULL))               // set when default char used
      {
         strcpy_s(aName, "ERROR decoding the Unicode string");
      }

      if(pExtensionList->aList[u].pClsid)
      {
         
         StringFromGUID2((GUID &)pExtensionList->aList[u].pClsid, (LPWSTR)s, sizeof(s));
         WideCharToMultiByte(CP_ACP,         // code page
                        0,                   // performance and mapping flags
                        (LPWSTR)s,           // wide-character string
                        -1,                  // number of chars in string
                        (LPSTR)aCLSID,              // buffer for new string
                        sizeof(aCLSID),      // size of buffer
                        NULL,                // default for unmappable chars
                        NULL);               // set when default char used
      }
      else
         lstrcpy(aCLSID, TEXT("NULL"));

      // write information about stream 'u'
      fprintf(fd, "[%d]: Name=%s, DataSize=%d, CLSID=%s\n", u, aName, pExtensionList->aList[u].uDataSize, aCLSID);
   }
   fclose(fd);

   ShellExecute(hWnd, TEXT("open"), TEXT("%UserProfile%\\My Documents\\LEADTOOLS Images\\temp\\1.txt"), NULL, NULL, SW_SHOWNORMAL);

   L_FreeExtensions(pExtensionList);
   return SUCCESS;
}