Zig Requires Chilkat v11.0.0+
Send GMail with BCC Recipients using REST API

Demonstrates how to send an email with BCC recipients using the GMail REST API.
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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.

    // Use the Chilkat Email API to create or load an email.
    const email = try chilkat.Email.init();
    defer email.deinit();

    // The From name/address don't need to be specified.
    // GMail will automatically use your Gmail address if the following 2 lines are omitted.
    email.setFromName("My Name");
    email.setFromAddress("my_account_name@gmail.com");

    email.addTo("John Smith", "somebody@somewhere.com") catch {};
    // To add more recipients, make additional calls to AddTo or AddCC, one per recipient...

    // -----------------------------------------------------------------------------------------
    // This section of this example demonstrates how to add BCC recipients.
    //
    // Technically, an email should never contain a "Bcc" MIME header because it would
    // effectively nullify the purpose of BCC -- which means "Blind Carbon Copy".
    // Email recipients should not be able to see the BCC recipients.
    // Chilkat never adds a "Bcc" header field.
    // However.. in this case, the GMail REST server will look for the Bcc header field,
    // and will include those email addresses when sending, and also removes the Bcc header
    // from the email that is sent.
    //
    // Starting in Chilkat v9.5.0.91, we can tell the email object to add the Bcc header
    // using the "UseBccHeader" UncommonOptions.  For example:
    email.setUncommonOptions("UseBccHeader");
    email.addBcc("Joe", "joe@example.com") catch {};
    email.addBcc("Dave", "dave@example.com") catch {};
    // ...
    // -----------------------------------------------------------------------------------------

    email.setSubject("This is a test GMail email created using Chilkat.");
    email.setCharset("utf-8");
    email.addPlainTextAlternativeBody("This is a test") catch {};

    // Create an HTML email body with an embedded image.
    const cid = try email.addRelatedFile(alloc, "qa_data/jpg/starfish.jpg");
    const sb_html = try chilkat.StringBuilder.init();
    defer sb_html.deinit();
    sb_html.append("<html><body>This is a <b>test</b><br><img src=\"cid:STARFISH_CID\"/></body></html>") catch {};
    _ = sb_html.replace("STARFISH_CID", cid);

    email.addHtmlAlternativeBody(try sb_html.getAsString(alloc)) catch {};

    // OK.. we now have an HTML email with an embedded JPG image
    // We'll need to get the full MIME of the email encoded to a base64url string.
    const sb_mime = try chilkat.StringBuilder.init();
    defer sb_mime.deinit();
    email.getMimeSb(sb_mime) catch {};
    sb_mime.encode("base64url", "utf-8") catch {};

    // The body of the HTTP request will be JSON..
    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.updateSb("raw", sb_mime) catch {};

    // Send the email...
    const http = try chilkat.Http.init();
    defer http.deinit();
    http.setAuthToken("GMAIL-ACCESS-TOKEN");

    const url = "https://www.googleapis.com/gmail/v1/users/me/messages/send";
    const resp = try chilkat.HttpResponse.init();
    defer resp.deinit();
    http.httpJson("POST", url, json, "application/json", resp) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    // A status code of 200 indicates success.
    std.debug.print("Response status code: {d}\n", .{resp.getStatusCode()});
    std.debug.print("Response body:\n", .{});
    std.debug.print("{s}\n", .{try resp.getBodyStr(alloc)});

    // The response body contains JSON.
    // Use the online tool at Generate JSON Parsing Code
    // to generate JSON parsing code.

    // A sample successful JSON response:

    // {
    //  "id": "166f0d4ac39e50bf",
    //  "threadId": "166f0d4ac39e50bf",
    //  "labelIds": [
    //   "SENT"
    //  ]
    // }
}