Rust
Outlook -- List Mail Folders

Uses the Microsoft Graph API to list Outlook mail folders.
Note: This example requires Chilkat v9.5.0.67 or greater.
Chilkat Rust Downloads

Rust
let mut success = false;

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

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

// 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.set_auth_token("MICROSOFT_GRAPH_ACCESS_TOKEN");

let sb_response = chilkat::StringBuilder::new();

// Sends:  GET /users/{id | userPrincipalName}/mailFolders
// Note: It is also possible to use the literal string "me" for the current logged-on user.
// For example: GET /me/mailFolders
http.clear_url_vars();
let _ = http.set_url_var("userPrincipalName", "chilkatsoft@outlook.com");
success = http.quick_get_sb("https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/mailFolders", &sb_response).is_ok();
if (!success) && (http.last_status() == 0) {
    println!("{}", http.last_error_text());
    return;
}

let json = chilkat::JsonObject::new();
let _ = json.load_sb(&sb_response);
json.set_emit_compact(false);

println!("Status code = {}", http.last_status());
if http.last_status() != 200 {
    println!("{}", json.emit().unwrap_or_default());
    println!("Failed.");
}

println!("{}", json.emit().unwrap_or_default());
println!("----");

// In my test case, this is the result (see below)
// Apparently, this lists folders without listing subfolders (aka child folders)
// There's another REST API call to list child folders.

// To iterate over the folders:
let mut i = 0;
let num_folders = json.size_of_array("value");
while i < num_folders {
    json.set_i(i);
    println!("{}", json.string_of("value[i].displayName").unwrap_or_default());
    i = i + 1;
}

// The output from the above loop:

// 	Archive
// 	Deleted Items
// 	Drafts
// 	Inbox
// 	Junk Email
// 	Outbox
// 	Sent Items

// ------------------------------------------------------------------------------------
// The raw JSON response: 

// {
//   "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('chilkatsoft%40outlook.com')/mailFolders",
//   "value": [
//     {
//       "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAG8XunwAAAA=",
//       "displayName": "Archive",
//       "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEIAAAA",
//       "childFolderCount": 0,
//       "unreadItemCount": 0,
//       "totalItemCount": 0
//     },
//     {
//       "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEKAAAA",
//       "displayName": "Deleted Items",
//       "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEIAAAA",
//       "childFolderCount": 0,
//       "unreadItemCount": 0,
//       "totalItemCount": 0
//     },
//     {
//       "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEPAAAA",
//       "displayName": "Drafts",
//       "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEIAAAA",
//       "childFolderCount": 0,
//       "unreadItemCount": 0,
//       "totalItemCount": 0
//     },
//     {
//       "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEMAAAA",
//       "displayName": "Inbox",
//       "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEIAAAA",
//       "childFolderCount": 2,
//       "unreadItemCount": 0,
//       "totalItemCount": 4
//     },
//     {
//       "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEiAAAA",
//       "displayName": "Junk Email",
//       "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEIAAAA",
//       "childFolderCount": 0,
//       "unreadItemCount": 0,
//       "totalItemCount": 0
//     },
//     {
//       "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgELAAAA",
//       "displayName": "Outbox",
//       "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEIAAAA",
//       "childFolderCount": 0,
//       "unreadItemCount": 0,
//       "totalItemCount": 0
//     },
//     {
//       "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEJAAAA",
//       "displayName": "Sent Items",
//       "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEIAAAA",
//       "childFolderCount": 0,
//       "unreadItemCount": 0,
//       "totalItemCount": 14
//     }
//   ]
// }
// 

// ------------------------------------------------------------------------------------------------------
// This example applies to: Exchange Online | Office 365 | Hotmail.com | Live.com | MSN.com | Outlook.com | Passport.com
// 
// The Microsoft Graph Outlook Mail API lets you read, create, and send messages and attachments, 
// view and respond to event messages, and manage folders that are secured by Azure Active Directory 
// in Office 365. It also provides the same functionality in Microsoft accounts specifically 
// in these domains: Hotmail.com, Live.com, MSN.com, Outlook.com, and Passport.com.