How can i access JPEG COM segment in iOS?

问题

JPEG has many Marker Segment Levels, I want to read and write Comment marker segment level - COM (read/write). It needs low level programming. How can i access it in iOS ?

References -

1. http://help.accusoft.com/ImageGear/v18.1/Mac/IGDLL-10-05.html
2. https://www.npmjs.com/package/jpeg-com-segment
3. http://www.sno.phy.queensu.ca/~phil/exiftool/

回答1:

IOS allows you to open files. Read the JPEG file. Search the stream for the COM marker. Read the length. Read the data. It's basic [objective] C programming.

来源：https://stackoverflow.com/questions/43535316/how-can-i-access-jpeg-com-segment-in-ios