CGPDFDocumentRef from NSData

问题

I get my PDF from SQLite DB into a NSData variable. Now what are my options to create CGPDFDocumentRef from this NSData?

Or what are my options anyway to create this CGPDFDocumentRef, have the data in SQLite?

回答1:

You can create a PDF document using this function:

CGPDFDocumentRef CGPDFDocumentCreateWithProvider (
   CGDataProviderRef provider
);

To create the provider you can use this function:

CGDataProviderRef CGDataProviderCreateWithCFData (
   CFDataRef data
);

and consider that NSData and CFDataRef are toll-free bridged so you can use them interchangeably.

So summarizing try this:

NSData *data = ... my data from SQLite ...
CFDataRef myPDFData = (CFDataRef)data;
CGDataProviderRef provider = CGDataProviderCreateWithCFData(myPDFData);
CGPDFDocumentRef pdf = CGPDFDocumentCreateWithProvider(provider);

Don't forget to CFRelease all unused data.

来源：https://stackoverflow.com/questions/4875672/cgpdfdocumentref-from-nsdata