Zig
Send GMail with Attachments

Demonstrates how to send an email containing attachments using the GMail REST API.
Chilkat Zig Downloads

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...

    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 {};

    // Add some attachments..
    var mime_type: [:0]const u8 = email.addFileAttachment(alloc, "qa_data/helloWorld.pdf") catch {
        std.debug.print("Failed to add PDF attachment.\n", .{});
        return;
    };

    mime_type = email.addFileAttachment(alloc, "qa_data/msword/sample2.docx") catch {
        std.debug.print("Failed to add MS-Word attachment.\n", .{});
        return;
    };

    // OK.. we now have an HTML email with 2 attachments..
    const sb_mime = try chilkat.StringBuilder.init();
    defer sb_mime.deinit();
    email.getMimeSb(sb_mime) catch {};

    // Send the email.  (GMail has a 5MB limit on the total email size.)
    const http = try chilkat.Http.init();
    defer http.deinit();
    http.setAuthToken("GMAIL-ACCESS-TOKEN");

    // Send using the simple upload request for the Gmail API
    const url = "https://www.googleapis.com/upload/gmail/v1/users/me/messages/send?uploadType=media";

    const resp = try chilkat.HttpResponse.init();
    defer resp.deinit();
    http.httpSb("POST", url, sb_mime, "utf-8", "message/rfc822", 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"
    //  ]
    // }
}