(Unicode 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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#include <CkJsonObjectW.h>
#include <CkHttpW.h>

void ChilkatSample(void)
    {
    // 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
    CkJsonObjectW json;
    json.UpdateString(L"client_id",L"2871da2c-8176-4b7f-869b-2311aa82e743");
    json.UpdateString(L"client_secret",L"2hu9Q~r5QuryUcEkNbg1btLtnfU1VUXzhSCG6brH");
    json.UpdateString(L"scope",L"https://graph.microsoft.com/.default");
    json.UpdateString(L"token_endpoint",L"https://login.microsoftonline.com/114d7ed6-71bf-4dbe-a866-748364121bf2/oauth2/v2.0/token");

    CkHttpW http;
    http.put_AuthToken(json.emit());

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

    const wchar_t *resp = 0;
    int i;
    int numItems;

    json.put_EmitCompact(false);

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

    while ((bGetMore == true)) {

        // Get the next chunk of DriveItems
        resp = http.quickGetStr(nextLink);
        if (http.get_LastMethodSuccess() != true) {
            wprintf(L"%s\n",http.lastErrorText());
            return;
        }

        // The response should be JSON.
        json.Load(resp);

        // A successful response should return a status code of 200.
        if (http.get_LastStatus() != 200) {
            wprintf(L"%s\n",json.emit());
            wprintf(L"Response status = %d\n",http.get_LastStatus());
            return;
        }

        // Iterate over the DriveItems in the JSON response:
        i = 0;
        numItems = json.SizeOfArray(L"value");
        while (i < numItems) {
            json.put_I(i);
            wprintf(L"name: %s\n",json.stringOf(L"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(L"\"@odata.nextLink\"") == true) {
            nextLink = json.stringOf(L"\"@odata.nextLink\"");
            wprintf(L"nextLink: %s\n",nextLink);
        }
        else {
            bGetMore = false;
        }

    }
    }