Zig

Extract PDF from JSON

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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. Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    const json = try chilkat.JsonObject.init();
    defer json.deinit();

    // Load the JSON.
    json.loadFile("qa_data/json/JSR5U.json") catch {
        std.debug.print("{s}\n", .{try json.getLastErrorText(alloc)});
        return;
    };

    // The JSON we loaded contains this:

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

    const sb = try chilkat.StringBuilder.init();
    defer sb.deinit();
    json.stringOfSb("data.content", sb) catch {};

    const bd = try chilkat.BinData.init();
    defer bd.deinit();
    bd.appendEncodedSb(sb, "base64") catch {};

    try bd.writeFile("qa_output/a0015.pdf");
}