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From Andreas Lehmkühler (JIRA) <j...@apache.org>
Subject [jira] [Commented] (PDFBOX-1240) Extract Images from PDF file using PDFBox in C#
Date Sat, 19 May 2012 16:57:41 GMT

    [ https://issues.apache.org/jira/browse/PDFBOX-1240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279584#comment-13279584
] 

Andreas Lehmkühler commented on PDFBOX-1240:
--------------------------------------------

Please update to a newer version of PDFBox, 0.7.3 is really outdated. There should be an executable
of ExtractImages so that you don't have to reimplement it.


                
> Extract Images from PDF file using PDFBox in C#
> -----------------------------------------------
>
>                 Key: PDFBOX-1240
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-1240
>             Project: PDFBox
>          Issue Type: New Feature
>          Components: Utilities
>    Affects Versions: 0.7.3
>            Reporter: Pham Minh Cuong
>            Priority: Minor
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> public class ExtractImage
>     {
>         private int imageCounter = 1;
>         private static string PASSWORD = "-password";
>         private static string PREFIX = "-prefix";
>         public ExtractImage()
>         {
>         }
>         public void extractImage(string []args)
>         {
>             if(args.Length<1||args.Length>4)
>             {
>                 usage();
>             }
>             else
>             {
>                 string pdfFile = "";
>                 string password = "";
>                 string prefix = null;
>                 for (int i = 0; i < args.Length; i++)
>                 {
>                     if(args[i]==PASSWORD)
>                     {
>                         i++;
>                         if (i >= args.Length)
>                         {
>                             usage();
>                         }
>                         password = args[i];
>                     }
>                     else if (args[i]==PREFIX)
>                     {
>                         i++;
>                         if(i>=args.Length)
>                         {
>                             usage();
>                         }
>                         prefix = args[i];
>                     }
>                     else
>                     {
>                         if(pdfFile==null)
>                         {
>                             pdfFile = args[i];
>                         }
>                     }
>                 }
>                 if(pdfFile==null)
>                 {
>                     usage();
>                 }
>                 else
>                 {
>                     if(prefix==null && pdfFile.Length>4)
>                     {
>                         prefix = pdfFile.Substring(0, pdfFile.Length - 4);
>                     }
>                     PDDocument document=null;
>                     try
>                     {
>                         document = PDDocument.load(pdfFile);
>                         if( document.isEncrypted() )
>                         {
>                      
>                             StandardDecryptionMaterial spm = new StandardDecryptionMaterial(password);
>                             document.openProtection(spm);
>                             AccessPermission ap = document.getCurrentAccessPermission();
>                              
>                             
>                             if( ! ap.canExtractContent() )
>                             {
>                                     Console.WriteLine("Error: You do not have permission
to extract images." );
>                             }
>                         }
>                      
>                         List   pages = document.getDocumentCatalog().getAllPages();
>                         java.util.Iterator   iter = pages.iterator();
>                         while( iter.hasNext() )
>                         {
>                             PDPage page = (PDPage)iter.next();
>                             PDResources resources = page.getResources();
>                             java.util.Map   images = resources.getImages();
>                             if( images != null )
>                             {
>                                 Iterator   imageIter = images.keySet().iterator();
>                                 while( imageIter.hasNext() )
>                                 {
>                                     string   key = (String  )imageIter.next();
>                                     PDXObjectImage image = (PDXObjectImage)images.get(
key );
>                                     string   name = getUniqueFileName( key, image.getSuffix()
);
>                                     Console.WriteLine( "Writing image:" + name );
>                                     image.write2file( name );
>                                 }
>                             }
>                         }
>                     }
>                     catch (Exception)
>                     {
>                         
>                         throw;
>                     }
>                 }
>             }
>         }
>         private string getUniqueFileName(string prefix, string suffix)
>         {
>             string uniqueName = null;
>             java.io.File f = null;
>             f = null;
>             while (f == null || f.exists())
>             {
>                 uniqueName = prefix + "-" + imageCounter;
>                 f =new File(uniqueName + "." + suffix);
>                 imageCounter++;
>             }
>             return uniqueName;
>         }
>         private void usage()
>         {
>             Console.Error.WriteLine("Usage: java org.pdfbox.ExtractImages [OPTIONS] <PDF
file>\n" +
>                                     " -password <password> Password to decrypt
document\n" +
>                                     " -prefix <image-prefix> Image prefix(default
to pdf name)\n" +
>                                     " <PDF file> The PDF document to use\n");
>             Environment.Exit(1);
>         }
>     }
> Reference: http://svn.apache.org/repos/asf/pdfbox/trunk/pdfbox/src/main/java/org/apache/pdfbox/ExtractImages.java

> I tested but i have a problem.It ran  if(args.Length<1||args.Length>4) and stopped
in usage().It loop.Please help me.Many thanks.
>                                                    {
>                                                        usage();
>                                                    }

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