Zig

QR Code Generator via api.qrserver.com REST API

See more HTTP Examples

Demonstrates how to generate a QR code using the api.qrserver.com REST API service. Zig

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

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

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

    const http = try chilkat.Http.init();
    defer http.deinit();

    // Send the following GET request to get a binary response.
    // The body of the binary response contains the image data for the QR code.
    // https://api.qrserver.com/v1/create-qr-code/?data=[URL-encoded-text]&size=[pixels]x[pixels]

    const query_params = try chilkat.JsonObject.init();
    defer query_params.deinit();
    query_params.updateString("data", "Hello World") catch {};
    query_params.updateString("size", "100x100") catch {};

    // Get a PNG file..
    // Possible formats are:
    // png
    // gif
    // jpeg
    // jpg
    // svg
    // eps
    // Case matters.  Use lowercase.
    query_params.updateString("format", "png") catch {};

    // Send the GET request to an endpoint.
    // Chilkat will add the url-encoded query params passed in the JSON.
    const resp = try chilkat.HttpResponse.init();
    defer resp.deinit();
    http.httpParams("GET", "https://api.qrserver.com/v1/create-qr-code/", query_params, resp) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    // Did it succeed?
    if (resp.getStatusCode() != 200) {
        // The response body, if anything, would not be the image data, but would likely be the error text (or HTML, or whatever...)
        std.debug.print("{s}\n", .{try resp.getBodyStr(alloc)});
        std.debug.print("Response status = {d}\n", .{resp.getStatusCode()});
        std.debug.print("Failed.\n", .{});
        return;
    }

    // Success if we get here..
    // Save the binary body as the PNG file, or you can get the bytes of the PNG..
    try resp.saveBodyBinary("c:/temp/qa_output/qr_code.png");

    // Or get the bytes:
    const bd = try chilkat.BinData.init();
    defer bd.deinit();
    resp.getBodyBd(bd) catch {};
    // Use the bytes in bd...
    // See the online reference documentation for the function to access the bytes directly.

    std.debug.print("Success.\n", .{});
}