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How does one initialize an General/NSData object with General/NSString data? (or integer data or any other data type?)

The easiest way is to use General/NSArchiver / General/NSUnarchiver or General/NSKeyedArchiver / General/NSKeyedUnarchiver. Look up this page on archives for more information: –General/JediKnil

General/NSString *string = @"This is some stuff."; General/NSData *stringData = [string dataUsingEncoding:General/NSASCIIStringEncoding allowLossyConversion:YES];

This does what you want; if you’re okay with the General/NSData having unicode characters, use General/NSUnicodeStringEncoding instead of General/NSASCIIStringEncoding. – General/AndyMatuschak

NSUTF8StringEncoding is almost always a better choice than General/NSASCIIStringEncoding. UTF-8 behaves exactly the same with ASCII characters, but behaves in a rational and predictable manner with non-ASCII characters.