(Objective-C) Outlook -- List Attachments for a Specific Message

Demonstrates how to list the attachments for a particular email message.

Note: This example requires Chilkat v9.5.0.67 or greater.

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#import <CkoHttp.h>
#import <CkoStringBuilder.h>
#import <NSString.h>
#import <CkoJsonObject.h>

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

CkoHttp *http = [[CkoHttp alloc] init];

// 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";

CkoStringBuilder *sbResponse = [[CkoStringBuilder alloc] init];

// Sends:  GET /users/{user_id | userPrincipalName}/messages/{message_id}/attachments
// Note: It is also possible to use the literal string "me" for the current logged-on user.
// For example: GET /me/messages/{message_id}/attachments

[http ClearUrlVars];
[http SetUrlVar: @"userPrincipalName" value: @"chilkatsoft@outlook.com"];

// Assume we already have a message ID from previously listing the messages in a folder
NSString *messageId = @"AAMkADYzZWE3YmZmLWU0YzgtNGNkZC04MGE1LWFiYTFlNTRlY2QwYQBGAAAAAAAu7cUXL5YOTrdsUIw7-v8FBwBUcG0qWqkmQYqWLHQataQxAACnwqJUAABUcG0qWqkmQYqWLHQataQxAACnwrnOAAA=";
[http SetUrlVar: @"message_id" value: messageId];

// Send the request to list the messages.
BOOL success = [http QuickGetSb: @"https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/messages/{$message_id}/attachments" sbContent: sbResponse];
if ((success != YES) && ([http.LastStatus intValue] == 0)) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json LoadSb: sbResponse];
json.EmitCompact = NO;

NSLog(@"%@%d",@"Status code = ",[http.LastStatus intValue]);
if ([http.LastStatus intValue] != 200) {
    NSLog(@"%@",[json Emit]);
    NSLog(@"%@",@"Failed.");
}

[sbResponse Clear];
[json EmitSb: sbResponse];
[sbResponse WriteFile: @"qa_output/attachments.txt" charset: @"utf-8" emitBom: NO];

NSLog(@"%@",@"OK");