Rust
Send GMail with Attachments

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

Rust

// 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.
let email = chilkat::Email::new();

// 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.set_from_name("My Name");
email.set_from_address("my_account_name@gmail.com");

let _ = email.add_to("John Smith", "somebody@somewhere.com");
// To add more recipients, make additional calls to AddTo or AddCC, one per recipient...

email.set_subject("This is a test GMail email created using Chilkat.");
email.set_charset("utf-8");
let _ = email.add_plain_text_alternative_body("This is a test");

// Create an HTML email body with an embedded image.
let cid = email.add_related_file("qa_data/jpg/starfish.jpg").unwrap_or_default();
let sb_html = chilkat::StringBuilder::new();
let _ = sb_html.append("<html><body>This is a <b>test</b><br><img src=\"cid:STARFISH_CID\"/></body></html>");
let num_replacements = sb_html.replace("STARFISH_CID", &cid);

let _ = email.add_html_alternative_body(&sb_html.get_as_string().unwrap_or_default());

// Add some attachments..
let Ok(mut mime_type) = email.add_file_attachment("qa_data/helloWorld.pdf") else {
    println!("Failed to add PDF attachment.");
    return;
};

mime_type = email.add_file_attachment("qa_data/msword/sample2.docx").unwrap_or_default();
if !email.last_method_success() {
    println!("Failed to add MS-Word attachment.");
    return;
}

// OK.. we now have an HTML email with 2 attachments..
let sb_mime = chilkat::StringBuilder::new();
let _ = email.get_mime_sb(&sb_mime);

// Send the email.  (GMail has a 5MB limit on the total email size.)
let http = chilkat::Http::new();
http.set_auth_token("GMAIL-ACCESS-TOKEN");

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

let resp = chilkat::HttpResponse::new();
if http.http_sb("POST", &url, &sb_mime, "utf-8", "message/rfc822", &resp).is_err() {
    println!("{}", http.last_error_text());
    return;
}

// A status code of 200 indicates success.
println!("Response status code: {}", resp.status_code());
println!("Response body:");
println!("{}", resp.body_str());

// 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"
//  ]
// }