Extracting images from a PDF
- by sagar
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.
