My Query

I want to extract only images from a PDF document, using Objective-C in an iPhone Application.

My Efforts

• I have gone through the info on this link, which has details regarding different operators on PDF documents.
• I also studied this document from Apple about PDF parsing with Quartz.

• I also went through the entire PDF reference document from the Adobe site. According to that document, for each image there are the following operators:

  • q
  • Q
  • BI
  • EI

• I have created a table to get the image:

   myTable = CGPDFOperatorTableCreate();
   CGPDFOperatorTableSetCallback(myTable, "q", arrayCallback2);
   CGPDFOperatorTableSetCallback(myTable, "TJ", arrayCallback);
   CGPDFOperatorTableSetCallback(myTable, "Tj", stringCallback);
  

• I use this method to get the image:

   void arrayCallback2(CGPDFScannerRef inScanner, void *userInfo) {
  
  
   // THIS DOESN'T WORK
   // CGPDFStreamRef stream; // represents a sequence of bytes    
   // if (CGPDFDictionaryGetStream (d, "BI", &stream)){
   //     CGPDFDataFormat t=CGPDFDataFormatJPEG2000;
   //     CFDataRef data = CGPDFStreamCopyData (stream, &t);
   // }
   }
  

This method is called for the operator "q", but I don't know how to extract an image from it.

What should be the solution for extracting the images from the PDF documents? Thanks in advance for your kind help.