How to open and get plain text from formats: pdf, doc, docx, xls, xlsx, rtf, ppt, pptx in mac os on objective c?

Question

Objective-C

Good afternoon.
Actually the purpose - to open a file and to receive its contents in NSString.
Is there a universal solution for the given formats? Is it necessary to use third party framework?

Answer 1

RTF

NSAttributedString *rtfString1 = [[NSAttributedString alloc] initWithRTF:data documentAttributes:NULL];
NSAttributedString *rtfString2 = [[NSAttributedString alloc] initWithRTFD:data documentAttributes:NULL];
NSAttributedString *rtfString3 = [[NSAttributedString alloc] initWithRTFDFileWrapper:fileWrapper documentAttributes:NULL];

https://developer.apple.com/library/ios/documentat...
PPTX , DOCX and XLSX are zip archives with xml documents that can be parsed with a bang by any xml parser. But I won’t say anything
about PPT , DOC and XLS .