(Objective-C) Egypt ITIDA Generate eReceipt UUID

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Demonstrates how to generate the eReceipt UUID for Egypt ITIDA.

Note: This example requires Chilkat v9.5.0.92 or greater.

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

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// Note: This example requires Chilkat v9.5.0.92 or greater.
// (In v9.5.0.92, the "itida" encoding was added to StringBuilder's Encode method.)
CkoStringBuilder *sb = [[CkoStringBuilder alloc] init];

// Load the eReceipt JSON into a StringBuilder object.
BOOL success = [sb LoadFile: @"qa_data/itida/EReceipt_ex.json" charset: @"utf-8"];
if (success == NO) {
    NSLog(@"%@",@"Failed to load input file.");
    return;
}

// Convert the contents of sb to the ITIDA canonical form.
// Always pass utf-8 for the 2nd arg.
[sb Encode: @"itida" charset: @"utf-8"];

// Get the lowercase hex encoded SHA256 hash of the canonicalized JSON
// (always use utf-8)
NSString *uuid = [sb GetHash: @"sha256" encoding: @"hex_lower" charset: @"utf-8"];
NSLog(@"%@%@",@"eInvoicing UUID = ",uuid);