iOS how convert png to pnm?

[junmoney83]

i am develping application which read barcode.

so i am using GOCR open source.

and i insert gocr source into xcode source and test is good.

but problem is that this application read only pnm file not png or jpeg.

so i want to convert png to pnm.

Is there any way?

 

[kainjow]

Get the CGImage from your UIImage, then look here for how to get at its pixel data:
http://developer.apple.com/mac/library/qa/qa2007/qa1509.html

With that it should be fairly straightforward to output as PNM:
http://en.wikipedia.org/wiki/Netpbm_format