(Objective-C) OneDrive -- Download to File

Downloads the contents of a DriveItem directly to a file in the local filesystem.

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

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#import <CkoHttp.h>
#import <NSString.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).

// (Make sure your token was obtained with the FilesRead or Files.ReadWrite scope.)
http.AuthToken = @"MICROSOFT_GRAPH_ACCESS_TOKEN";

// Sends the following GET request:
// GET https://graph.microsoft.com/v1.0/me/drive/root:/{item-path}:/content

// Make sure to automatically follow redirects
http.FollowRedirects = YES;

// This example will download /Misc/wildlife/penguins.jpg
[http SetUrlVar: @"item_path" value: @"Misc/wildlife/penguins.jpg"];

// Stream the response body directly to a local file.
NSString *localPath = @"qa_output/penguins.jpg";

BOOL success = [http Download: @"https://graph.microsoft.com/v1.0/me/drive/root:/{$item_path}:/content" saveToPath: localPath];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

// If the response status code was not 200, then it failed.
if ([http.LastStatus intValue] != 200) {
    NSLog(@"%@%d",@"Response Status Code = ",[http.LastStatus intValue]);
    NSLog(@"%@",@"Failed.");
    return;
}

// If we got here, then the file was successfully downloaded.
NSLog(@"%@",@"Download from OneDrive successful.");