(Objective-C) OneDrive -- List Large Directory

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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.

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

// 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;
    }

}