React Native

Outlook -- Get Number of Emails

See more Outlook Examples

Gets the number of emails in an Outlook folder. This uses the OData $count system query option. See OData System Query Option $count for general information.

This example first gets the combined total number of messages across all folders.

Note: This example requires Chilkat v9.5.0.68 or greater.

This example applies to: Exchange Online | Office 365 | Hotmail.com | Live.com | MSN.com | Outlook.com | Passport.com

React Native

import { Hashtable, Http, JsonObject, StringBuilder } from '@chilkat/react-native'

async function chilkatExample() {
  let success = false;

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

  const http = new Http();

  // Use your previously obtained access token here:
  // See the following examples for getting an access token:
  //    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
  //    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
  //    Refresh Access Token (Azure AD v2.0 Endpoint).
  //    Refresh Access Token (Azure AD Endpoint).

  http.authToken = 'MICROSOFT_GRAPH_ACCESS_TOKEN';

  const sbResponse = new StringBuilder();

  // This gets the combined total number of emails in all folders.
  success = true;
  try {
    await http.quickGetSbAsync('https://graph.microsoft.com/v1.0/me/messages/$count', sbResponse);
  } catch {
    success = false;
  }
  if ((!success) && (http.lastStatus === 0)) {
    console.log(http.lastErrorText);
    return;
  }

  const json = new JsonObject();
  json.emitCompact = false;

  // If the status code was not 200, then it failed and the response is likely JSON:
  if (http.lastStatus !== 200) {
    console.log(`Status code = ${http.lastStatus}`);
    json.loadSb(sbResponse);
    console.log(json.emit());
    console.log('Failed.');
    return;
  }

  // A success response payload contains just the integer value (it is not JSON)
  console.log(`Combined Total Number of Emails = ${sbResponse.getAsString()}`);
  console.log('--');

  // ---------------------------------------------------------------------------
  // To get the number of emails in a particular folder, we need to use the folder id.
  // 

  // In this example, we'd like to get number of messages in the folder "/Inbox/abc",
  // but we must specify the corresponding folder_id.  The best way to do this is to create
  // a local map of folderPaths-to-folderIds.
  // We'll use the map created by this example:  Create Outlook Folder Map)
  const htFolderMap = new Hashtable();
  const sbMap = new StringBuilder();
  sbMap.loadFile('qa_data/outlook/folderMap.xml', 'utf-8');
  htFolderMap.addFromXmlSb(sbMap);

  // Get the ID for the "/Inbox/abc" folder:
  let folderId: string;
  try {
    folderId = htFolderMap.lookupStr('/Inbox/abc');
  } catch {
    console.log('Folder ID not found');
    return;
  }

  http.setUrlVar('folder_id', folderId);

  // Send the request get the folder information.
  // In this case we are NOT using the $count system query option.
  success = true;
  try {
    await http.quickGetSbAsync('https://graph.microsoft.com/v1.0/me/mailFolders/{$folder_id}', sbResponse);
  } catch {
    success = false;
  }
  if ((!success) && (http.lastStatus === 0)) {
    console.log(http.lastErrorText);
    return;
  }

  json.loadSb(sbResponse);
  console.log(json.emit());
  console.log('--');

  if (http.lastStatus !== 200) {
    console.log(`Status code = ${http.lastStatus}`);
    console.log('Failed.');
    return;
  }

  // The successful JSON response looks like this;

  // 	{
  // 	  "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('me')/mailFolders/$entity",
  // 	  "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAAA=",
  // 	  "displayName": "abc",
  // 	  "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEMAAAA",
  // 	  "childFolderCount": 2,
  // 	  "unreadItemCount": 0,
  // 	  "totalItemCount": 3
  // 	}
  // 

  // Get the integer value from the JSON like this:
  const totalItemCount = json.intOf('totalItemCount');
  console.log(`totalItemCount = ${totalItemCount}`);

  const childFolderCount = json.intOf('childFolderCount');
  console.log(`childFolderCount = ${childFolderCount}`);

  // etc..
}