Rust

Get GMail Message Metadata

See more GMail REST API Examples

Demonstrates how to get the metadata for each message in a list of message IDs. Rust

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

let http = chilkat::Http::new();

http.set_auth_token("ACCESS_TOKEN");

http.set_accept("application/json");

// Let's say we have the following JSON containing a list of message ID's

// {
//   "messages": [
//     {
//       "id": "1712bc1dc22da2a2",
//       "threadId": "1712bc1dc22da2a2"
//     },
//     {
//       "id": "1712b94fa2168040",
//       "threadId": "1712b94fa2168040"
//     },
//     {
//       "id": "1711e4bd96ded05e",
//       "threadId": "1711e4bd96ded05e"
//     },
//     {
//       "id": "1711de0d119e751e",
//       "threadId": "1711de0d119e751e"
//     },
//     {
//       "id": "1711c81a43050f59",
//       "threadId": "1711c81a43050f59"
//     },
//     {
//       "id": "1711c2c1516abce5",
//       "threadId": "1711c2c1516abce5"
//     },
//     {
//       "id": "1711c161e655c915",
//       "threadId": "1711c161e655c915"
//     },
//     {
//       "id": "171199c6e454558c",
//       "threadId": "171199c6e454558c"
//     },
//     {
//       "id": "17119474c8aa248e",
//       "threadId": "17119474c8aa248e"
//     }
//   ],
//   "nextPageToken": "16710921492249671162",
//   "resultSizeEstimate": 309
// }

// Normally your program would have the above JSON in a string variable (obtained from a previous call to get
// a list of message IDs from a GMail mailbox).  In this example, we'll load the JSON from a file.
let json_msg_ids = chilkat::JsonObject::new();
let _ = json_msg_ids.load_file("qa_data/json/gmail_message_ids.json").is_ok();

let resp = chilkat::HttpResponse::new();

let mut id = String::new();
let mut i = 0;
let count_i = json_msg_ids.size_of_array("messages");
while i < count_i {
    json_msg_ids.set_i(i);
    id = json_msg_ids.string_of("messages[i].id").unwrap_or_default();

    // Get the metadata for this message ID.
    let _ = http.set_url_var("id", &id);

    if http.http_no_body("GET", "https://www.googleapis.com/gmail/v1/users/userId/messages/{$id}?format=metadata", &resp).is_err() {
        println!("{}", http.last_error_text());
        return;
    }

    println!("Response Status Code: {}", resp.status_code());

    let json_response = chilkat::JsonObject::new();
    let _ = json_response.load(&resp.body_str());
    json_response.set_emit_compact(false);
    println!("{}", json_response.emit().unwrap_or_default());

    if resp.status_code() != 200 {
        println!("Failed.");
        return;
    }

    i = i + 1;
}

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON