Hi Jo,
PoDoFo has not all predictors implemented yet. Could you please send me the
relevant PDF file or take a look at the class PdfPredictorDecoder in
PdfFiltersPrivate.cpp? It should be farely easy to add support for the missing
predictors,, just take a look at the missing implementations in the switch
statement!
Regards,
Dominik
On Monday 23 August 2010 21:33:10 Jo Van der Snickt wrote:
> During the extraction of images from a PDF file I have a problem extracting
> FlateDecoded images. The following piece of code fails on the
> GetFilteredCopy method.
>
> PdfObject * imagePtr = m_pdfPagePtr->GetFromResources( PdfName(
> "XObject" ), imageRef.GetName() ); PdfObject * imageFilterPtr =
> imagePtr->GetDictionary().GetKey( PdfName::KeyFilter );
>
> if ( imageFilterPtr && imageFilterPtr->IsName() &&
> imageFilterPtr->GetName().GetName() == "FlateDecode" ) {
> PdfMemStream *streamPtr = dynamic_cast<PdfMemStream *>(
> (*imagePtr).GetStream() );
>
> char fileName[ 30];
> char filePath[256];
>
> snprintf( fileName, 30, "image%04i_%04i",
> m_pdfPagePtr->GetPageNumber(),
> ++m_imageCount ); snprintf( filePath, 256, "%s%s", outputDir.c_str(),
> fileName );
>
> FILE * fileHandle = fopen( filePath, "wb" );
>
> char * filePtr;
> pdf_long bufferSize;
>
> streamPtr->GetFilteredCopy( &filePtr, &bufferSize );
> fwrite( filePtr, bufferSize, sizeof(char), fileHandle );
> fclose( fileHandle );
> }
>
> The actual error is:
>
> PoDoFo encounter an error. Error: 22 ePdfError_InvalidPredictor
> Callstack:
> #0 Error Source:
> /home/jo/dvlp/dev/podofo-trunc/podofo/src/PdfFiltersPrivate.cpp:538 #1
> Error Source:
> /home/jo/dvlp/dev/podofo-trunc/podofo/src/PdfFiltersPrivate.cpp:145
>
>
> The image is correctly displaying in a PDF reader.
>
> Any idea what might be the cause?
>
> - Jo
>
>
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