reading with CGPDFDocumentRef and saving PDF

i am reading PDF files using CGPDFDocumentRef but now i wa开发者_JAVA百科nt to save that PDF file in my iPhone, how to do it, what to use ? if any example is giving it will be highly appreciated. Thanks :)

Check out the way Apple does it in their Quartz 2D Programming Guide (specifically Listing 13-4).