convert NSString value to NSData

http://stackoverflow.com/questions/901357/nsstring-to-nsdata

(1)

NSString* str= @"teststring";
NSData* data=[str dataUsingEncoding:NSUTF8StringEncoding];

(2)

NSString* myString= @"testing";
NSData* data=[myString dataUsingEncoding: [NSString defaultCStringEncoding] ];

(3)

NSData* data = [yourString dataUsingEncoding:NSUTF8StringEncoding]; 

data = [data subdataWithRange:NSMakeRange(0, [data length] - 1)];