(Objective-C) OneDrive -- List Large Directory

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 v9.5.0.68 or greater.

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#import <CkoHttp.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).

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

// This example will get the DriveItems in /lots-of-files, which has 450 children..
[http SetUrlVar: @"item_path" value: @"/lots-of-files"];

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

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

// This loop will download DriveItems in sets of 50 until no more exist.
BOOL bGetMore = YES;
// (Add the $top query parameter to define the page size, i.e. the max number of results to return).
NSString *nextLink = @"https://graph.microsoft.com/v1.0/me/drive/root:{$item_path}:/children?$top=50";

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;
    }

}