Objective-C

OneDrive -- List Large Directory

See more OneDrive Examples

Demonstrates how to get the entire collection of DriveItem children when the collection is large and multiple pages need to be requested. To test this example, I created a DriveItem with 450 children.

Note: This example requires Chilkat v9.5.0.97 or greater.

Objective-C

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

BOOL success = NO;

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

// This example uses the OAuth client credentials flow.
// See How to Create an Azure App Registration for OAuth 2.0 Client Credentials

// Use your client ID, client secret, and tenant ID in the following lines
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json UpdateString: @"client_id" value: @"2871da2c-8176-4b7f-869b-2311aa82e743"];
[json UpdateString: @"client_secret" value: @"2hu9Q~r5QuryUcEkNbg1btLtnfU1VUXzhSCG6brH"];
[json UpdateString: @"scope" value: @"https://graph.microsoft.com/.default"];
[json UpdateString: @"token_endpoint" value: @"https://login.microsoftonline.com/114d7ed6-71bf-4dbe-a866-748364121bf2/oauth2/v2.0/token"];

CkoHttp *http = [[CkoHttp alloc] init];
http.AuthToken = [json Emit];

// This example will get the DriveItems in /lots-of-files, which has 450 children..
[http SetUrlVar: @"item_path" value: @"/lots-of-files"];
[http SetUrlVar: @"user_id" value: @"4fe732c3-322e-4a6b-b729-2fd1eb5c6104"];

NSString *resp = 0;
int i;
int numItems;

json.EmitCompact = NO;

// This loop will download DriveItems in sets of 25 until no more exist.
BOOL bGetMore = YES;
// (Add the $top query parameter to define the page size, i.e. the max number of results to return).
NSString *nextLink = @"https://graph.microsoft.com/v1.0/users/{$user_id}/drive/root:{$item_path}:/children?$top=25";

while ((bGetMore == YES)) {

    // Get the next chunk of DriveItems
    resp = [http QuickGetStr: nextLink];
    if (http.LastMethodSuccess != YES) {
        NSLog(@"%@",http.LastErrorText);
        return;
    }

    // The response should be JSON.
    [json Load: resp];

    // A successful response should return a status code of 200.
    if ([http.LastStatus intValue] != 200) {
        NSLog(@"%@",[json Emit]);
        NSLog(@"%@%d",@"Response status = ",[http.LastStatus intValue]);
        return;
    }

    // Iterate over the DriveItems in the JSON response:
    i = 0;
    numItems = [[json SizeOfArray: @"value"] intValue];
    while (i < numItems) {
        json.I = [NSNumber numberWithInt: i];
        NSLog(@"%@%@",@"name: ",[json StringOf: @"value[i].name"]);
        i = i + 1;
    }

    // If a nextLink was included in the JSON, use it to get the next set of 50 DriveItems.
    // Otherwise, exit the loop.
    if ([json HasMember: @"\"@odata.nextLink\""] == YES) {
        nextLink = [json StringOf: @"\"@odata.nextLink\""];
        NSLog(@"%@%@",@"nextLink: ",nextLink);
    }
    else {
        bGetMore = NO;
    }

}