从Char到NSString ObjC

Question

NSString *filePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"myFile"];
NSData *bytes = [[NSData alloc] initWithContentsOfFile:filePath];
NSUInteger len = [bytes length];    
Byte *byteData = (Byte*)malloc(len);
memcpy(byteData, [bytes bytes], len);
NSMutableString *fileContents = [NSMutableString alloc] init];
for (int i = 0; i < len; i++) {
    char curChar = byteData[i];
    [fileContents appendString:[NSString stringWithFormat:@"%c", curChar]];
}

Putting a breakpoint right after char curChar = byteData[i] , I see this: http://i.imgur.com/ryyi0Rw.png http://i.imgur.com/RaRQ7fu.png
How do I append to fileContents exactly what is shown in the image (\\x02, \\xd0 etc)? Currently all I get are weird characters like Ð
I've seen a lot of questions about how to convert a char to NSString but nothing does what I want...

Answer 1

Use a different format:

[fileContents appendString:[NSString stringWithFormat:@"\\x%02x", (unsigned)curChar]];

EDIT: To save typing you can use appendFormat: (as pointed out in the now deleted answer from Nikolai Ruhe).

Answer 2

If you mean you want literally backslash-x-0-2, then see @trojanfoe's answer. If you mean you want "the character with value 2," then read on.

What encoding is the file in? You can't talk about a string without considering its encoding. If it's "just a string of bytes" then that isn't an NSString ; it's an NSData and should be treated that way.

Once you know the encoding, then you shouldn't need the NSData step. Just use [NSString stringWithContentsOfFile:encoding:error:] .