How to covert an image and a video to multipart enctype format and post it to a server in my iphone app

Question

I am developing an application in which I am recording a video and taking pics . . now I want to upload these pics to server . . these images or videos should be of multipart enctype format before making a post request.

I have used this to get a base64Encoding format but how to convert to ultipart enctype format.

NSData *recVideo = [NSData dataWithContentsOfURL:URLvideo]; NSString *VideoRecStr = [recVideo base64EncodingWithLineLength:80];

Please suggest some sol. a.s.p .

Thank you