(Objective-C) Extract PDF from JSON

Demonstrates how to extract a PDF file contained within JSON. The file is represented as a base64 string within the JSON. Note: This example can extract any type of file, not just a PDF file.

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#import <CkoJsonObject.h>
#import <CkoStringBuilder.h>
#import <CkoBinData.h>

CkoJsonObject *json = [[CkoJsonObject alloc] init];

// Load the JSON.
BOOL success = [json LoadFile: @"qa_data/json/JSR5U.json"];
if (success != YES) {
    NSLog(@"%@",json.LastErrorText);
    return;
}

// The JSON we loaded contains this:

// 	{
// 	...
// 	...
// 	  "data": {
// 	    "content": "JVBERi0xLjQ..."
// 	  }
// 	...
// 	...
// 	}

CkoStringBuilder *sb = [[CkoStringBuilder alloc] init];
[json StringOfSb: @"data.content" sb: sb];

CkoBinData *bd = [[CkoBinData alloc] init];
[bd AppendEncodedSb: sb encoding: @"base64"];

success = [bd WriteFile: @"qa_output/a0015.pdf"];