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LOptimize::OptimizeDir

Summary

Optimizes a directory of images using the specified optimization options, and saves the optimized images to a new directory with the same hierarchy.

Syntax

#include "ltwrappr.h"

L_INT LOptimize::OptimizeDir(pszOrgDirPath, pszOptDirPath, pOptImgOptions, pszFilesExt, bIncludeSubDirs)

Parameters

L_TCHAR * pszOrgDirPath

Character string that contains the full path directory of the supported images to optimize.

L_TCHAR * pszOptDirPath

Character string that contains the full path directory to save the optimized image(s).

pOPTIMIZEIMAGEOPTIONS pOptImgOptions

Pointer to an OPTIMIZEIMAGEOPTIONS structure that contains the options used in optimization. Pass NULL to use the default optimization options.

L_TCHAR * pszFilesExt

Pointer to a character string that contains the extensions of the files to optimize. This is a NULL terminated string and can have a maximum length of MAX_PATH. For example:

To optimize all "gif" and "jpeg" files, pszFilesExt should be set to ".gif;.jpeg".

To optimize all the supported files found in the pszOrgDirPath directory, regardless of the their extensions, pszFilesExt should be set to ".".

L_BOOL bIncludeSubDirs

Flag that indicates whether to include sub-directories when optimizing. Possible values are:

Value	Meaning
TRUE	Include sub-directories when optimizing.
FALSE	Exclude sub-directories when optimizing.

Returns

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

Comments

This function looks for all the selected and supported files in the pszOrgDirPath directory and optimizes them using the optimization options passed in the pOptImgOptions parameter. It then saves the optimized images to the pszOptDirPath directory.

Both the pszOrgDirPath and pszOptDirPath parameters should contain a full path, complete with drive name. The pszOrgDirPath parameter should contain the full path to the input (original) directory, and the pszOptDirPath parameter should contain the full path to the output (optimized) directory.

This function does not support 32-bit grayscale images. It returns the error code ERROR_GRAY32_UNSUPPORTED if a 32-bit grayscale image is passed to this function.

Required DLLs and Libraries

LTIMGOPT
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

class LOptimizeDirChild : public LOptimize 
{ 
public: 
   LOptimizeDirChild(); 
   ~LOptimizeDirChild(); 
 
   virtual L_INT OptimizeDirCallBack(pOPTIMIZEIMAGEDIRINFO pOptImgDirCBInfo); 
}; 
 
LOptimizeDirChild::LOptimizeDirChild() 
{ 
} 
 
LOptimizeDirChild::~LOptimizeDirChild() 
{ 
} 
 
L_INT LOptimizeDirChild::OptimizeDirCallBack(pOPTIMIZEIMAGEDIRINFO pOptImgDirCBInfo) 
{ 
   // Check if pOPTIMIZEIMAGEDIRINFO data is a valid pointer 
   if(pOptImgDirCBInfo) 
   { 
      L_TCHAR buf[200]; // Message buffer 
 
      switch(pOptImgDirCBInfo->nStatusCode) 
      { 
         case OPTIMIZE_DIR_PRE_OPTIMIZINGIMAGE: /* Pre Optimizing Image */ 
         { 
            MessageBox(NULL, TEXT("Pre Optimize Image"), TEXT("Note"), MB_OK); 
            if((pOptImgDirCBInfo->pFileInfo->Format == FILE_JPEG) || 
               (pOptImgDirCBInfo->pFileInfo->Format == FILE_JPEG_411) || 
               (pOptImgDirCBInfo->pFileInfo->Format == FILE_JPEG_422) || 
               (pOptImgDirCBInfo->pFileInfo->Format == FILE_EXIF_JPEG_411) || 
               (pOptImgDirCBInfo->pFileInfo->Format == FILE_EXIF_JPEG_422)) 
               pOptImgDirCBInfo->pOptImgOptions->JPEGColorSpace = JPEG_COLORSPACE_422; 
         } 
         break; 
 
         case OPTIMIZE_DIR_OPTIMIZINGIMAGE: /* Optimizing ... */ 
         { 
            static int i = 1; // Optimized files counter 
 
            // display the current file and total percent 
            wsprintf(buf, TEXT("%d %% of optimizing %s to %s \nFiles %d of %d"), pOptImgDirCBInfo->nFilePercent, pOptImgDirCBInfo->szOrgFileName, pOptImgDirCBInfo->szOptFileName, i, pOptImgDirCBInfo->nTotalFolderFilesCount); 
            MessageBox(NULL, buf, TEXT("Optimizing"), MB_OK); 
 
            // if nFilePercent = 100 increment the counter by 1 
            if((pOptImgDirCBInfo->nFilePercent == 100) && ((i + 1) <= pOptImgDirCBInfo->nTotalFolderFilesCount)) 
            i++; 
         } 
         break; 
 
         case SUCCESS: /* Optimizing operation Successfully done */ 
         { 
            MessageBox(NULL, TEXT("Operation Successfully Done"), TEXT("Optimizing"), MB_OK); 
         } 
         break; 
 
         default: 
         { 
            /* report error to user */ 
            /* Give the user the ability to skip the current image only or cancel the whole operation*/ 
            wsprintf(buf, TEXT("Error: %d - Optimizing Image!\n%s\nPress OK to skip this file and optimize the next one!"), pOptImgDirCBInfo->nStatusCode, pOptImgDirCBInfo->szOrgFileName); 
            if(MessageBox(NULL, buf, TEXT("Error"), MB_OKCANCEL|MB_ICONERROR) == IDOK) 
               return(ERROR_OPT_SKIPIMAGE); 
            else 
               return(ERROR_OPT_ABORT); 
         } 
         break; 
      } 
   } 
   return SUCCESS; 
} 
 
L_INT LOptimize__OptimizeDirExample(L_TCHAR* pszPath)  
{ 
   L_INT nRet ; 
 
   LOptimizeDirChild opt ; 
   opt.EnableCallBack(TRUE) ; 
 
   OPTIMIZEIMAGEOPTIONS OptImgOptions; 
   OptImgOptions.uStructSize = sizeof(OptImgOptions); 
   OptImgOptions.uJPEGQFactor = 35; 
   OptImgOptions.uPNGQFactor=5; 
   OptImgOptions.JPEGColorSpace = JPEG_COLORSPACE_422; 
   OptImgOptions.nPercent=50; 
   OptImgOptions.uDistance=0; 
   OptImgOptions.bPickSamePalette=L_TRUE; 
 
   nRet = opt.OptimizeDir( pszPath, /* The original Dir to be optimized. */ 
                           MAKE_IMAGE_PATH(TEXT("OptimizedImages")),/* The New Dir to save the Optimized image(s) to.*/ 
                           &OptImgOptions, /* Optimization options.*/ 
                           TEXT("*.jpg;*.bmp;*.gif"), /* optimize all images with ext jpg, gif and bmp only.*/ 
                           TRUE /* Optimize or not the sub-dirs.*/); 
 
   if(nRet != SUCCESS) 
      return nRet; 
 
   return SUCCESS; 
}