(Objective-C) Insert PDF as Base64 into XML, then Extract back to PDF File

Demonstrates how to insert any file into XML using base64 encoding, and then extract back to the original file. This example embeds a PDF in the XML, but the type of file does not matter. It can be any type of file.

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#import <CkoBinData.h>
#import <CkoXml.h>

// Load our PDF file.
CkoBinData *bd = [[CkoBinData alloc] init];
BOOL success = [bd LoadFile: @"qa_data/helloWorld.pdf"];
if (success != YES) {
    NSLog(@"%@",@"Failed to load PDF file.");
    return;
}

// Load the following XML:
// 
// <?xml version="1.0" encoding="utf-8" ?>
// <something>
//     <xyz>
//         <abc123>A base64 encoded PDF file will be inserted under this node.</abc123>
//     </xyz>
// </something>

CkoXml *xml = [[CkoXml alloc] init];
success = [xml LoadXmlFile: @"qa_data/xml/xmlToContainPdf.xml"];
if (success != YES) {
    NSLog(@"%@",@"Failed to load XML file.");
    return;
}

// Insert the PDF into the XML.
[xml NewChild2: @"xyz|pdfData" content: [bd GetEncoded: @"base64"]];

// Show the new XML:
NSLog(@"%@",[xml GetXml]);

// The XML now looks like this:
// <?xml version="1.0" encoding="utf-8" ?>
// <something>
//     <xyz>
//         <abc123>A base64 encoded PDF file will be inserted under this node.</abc123>
//         <pdfData>JVBERi0xL ... UlRU9GCg==</pdfData>
//     </xyz>
// </something>

// To extract the PDF data out and restore the PDF file:
CkoBinData *bd2 = [[CkoBinData alloc] init];
success = [bd2 AppendEncoded: [xml GetChildContent: @"xyz|pdfData"] encoding: @"base64"];
success = [bd2 WriteFile: @"qa_output/helloWorld.pdf"];

NSLog(@"%@",@"Success.");