Lua

Read/Write JSON with Binary Data such as JPEG Files

See more JSON Examples

Demonstrates how binary files could be stored in JSON in base64 format. Creates JSON containing the contents of a JPG file, and then reads the JSON to extract the JPEG image. Lua

local chilkat = require("chilkat")

-- First load a small JPG file..
local bd = chilkat.BinData.new()

local success = bd:load_file("qa_data/jpg/starfish20.jpg")
-- Assume success, but your code should check for success..

-- Create JSON containing the binary data in base64 format.
local json1 = chilkat.JsonObject.new()
json1:update_bd("starfish", "base64", bd)

local jsonStr = json1:emit()
print(jsonStr)

-- Here's the output:
-- {"starfish":"/9j/4AAQSkZJRgA ... cN2iuLFsCEbDGxQkI6RO/n//2Q=="}

-- Let's create a new JSON object, load it with the above JSON, and extract the JPG image..
local json2 = chilkat.JsonObject.new()
json2:load(jsonStr)

-- Get the binary bytes.
local bd2 = chilkat.BinData.new()
json2:bytes_of("starfish", "base64", bd2)

-- Save to a file.
success = bd2:write_file("qa_output/starfish20.jpg")

print("Success.")