Dart

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. Dart

import 'package:chilkat/chilkat.dart';

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

  final http = CkHttp();

  http.authToken = 'ACCESS_TOKEN';

  http.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.
  final jsonMsgIds = CkJsonObject();
  jsonMsgIds.loadFile('qa_data/json/gmail_message_ids.json');

  final resp = CkHttpResponse();

  var id = '';
  var i = 0;
  final countI = jsonMsgIds.sizeOfArray('messages');
  while (i < countI) {
    jsonMsgIds.i = i;
    id = jsonMsgIds.stringOf('messages[i].id');

    // Get the metadata for this message ID.
    http.setUrlVar('id', id);

    try {
      http.httpNoBody('GET', 'https://www.googleapis.com/gmail/v1/users/userId/messages/{\$id}?format=metadata', resp);
    } on ChilkatException catch (e) {
      print(e.lastErrorText);
      return;
    }

    print('Response Status Code: ${resp.statusCode}');

    final jsonResponse = CkJsonObject();
    jsonResponse.load(resp.bodyStr);
    jsonResponse.emitCompact = false;
    print(jsonResponse.emit());

    if (resp.statusCode != 200) {
      print('Failed.');
      return;
    }

    i++;
  }

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