(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 <C_CkJsonObjectW.h>
#include <C_CkHttpW.h>

void ChilkatSample(void)
    {
    HCkJsonObjectW json;
    HCkHttpW http;
    const wchar_t *resp;
    int i;
    int numItems;
    BOOL bGetMore;
    const wchar_t *nextLink;

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

    http = CkHttpW_Create();
    CkHttpW_putAuthToken(http,CkJsonObjectW_emit(json));

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

    CkJsonObjectW_putEmitCompact(json,FALSE);

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

    while ((bGetMore == TRUE)) {

        // Get the next chunk of DriveItems
        resp = CkHttpW_quickGetStr(http,nextLink);
        if (CkHttpW_getLastMethodSuccess(http) != TRUE) {
            wprintf(L"%s\n",CkHttpW_lastErrorText(http));
            CkJsonObjectW_Dispose(json);
            CkHttpW_Dispose(http);
            return;
        }

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

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

        // Iterate over the DriveItems in the JSON response:
        i = 0;
        numItems = CkJsonObjectW_SizeOfArray(json,L"value");
        while (i < numItems) {
            CkJsonObjectW_putI(json,i);
            wprintf(L"name: %s\n",CkJsonObjectW_stringOf(json,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 (CkJsonObjectW_HasMember(json,L"\"@odata.nextLink\"") == TRUE) {
            nextLink = CkJsonObjectW_stringOf(json,L"\"@odata.nextLink\"");
            wprintf(L"nextLink: %s\n",nextLink);
        }
        else {
            bGetMore = FALSE;
        }

    }



    CkJsonObjectW_Dispose(json);
    CkHttpW_Dispose(http);

    }