(Objective-C) Decode 2-digit Hex Escaped

Demonstrates how to replace escaped us-ascii chars such as \x7b and \x22 with the chars.

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#import <NSString.h>
#import <CkoStringBuilder.h>

// We have the following string with some us-ascii chars escaped like this:
NSString *s = @"\x7b\x22responseContext\x22:\x7b\x22";

// Note: The above escaping does not conform to any standard format (as far as I know).
// Chilkat does not have anything to decode from the above.
// However, we can 1st transform into a standard format, and then decode..

// JSON escapes chars outside us-ascii like this:  "Hello, \ud83d\ude03!"
// We can transform the above to this:  "\u007b\u0022responseContext\u0022:\u007b\u0022"
// And then decode..

CkoStringBuilder *sb = [[CkoStringBuilder alloc] init];

[sb Append: s];
int numReplaced = [[sb Replace: @"\\x" replacement: @"\\u00"] intValue];

// Now decode from "json" escapes
[sb Decode: @"json" charset: @"utf-8"];

// Show the decoded string
NSLog(@"%@",[sb GetAsString]);

// Here's the result: {"responseContext":{"