(Unicode C++) OneDrive -- Download Text File to Memory

Downloads a text file (such as XML, JSON, plain-text, HTML, etc.) into a StringBuilder object.

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

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#include <CkJsonObjectW.h>
#include <CkHttpW.h>
#include <CkStringBuilderW.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());

    // Sends the following GET request:
    // GET https://graph.microsoft.com/v1.0/users/{$user_id}/drive/root:/{item-path}:/content

    // Make sure to automatically follow redirects
    http.put_FollowRedirects(true);

    // This example will download /Misc/hamlet.xml
    http.SetUrlVar(L"item_path",L"Misc/hamlet.xml");
    http.SetUrlVar(L"user_id",L"4fe732c3-322e-4a6b-b729-2fd1eb5c6104");

    CkStringBuilderW sbXml;
    const wchar_t *expectedCharset = L"utf-8";
    const wchar_t *url = L"https://graph.microsoft.com/v1.0/users/{$user_id}/drive/root:/{$item_path}:/content";
    bool success = http.DownloadSb(url,expectedCharset,sbXml);
    if (http.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    // If the response status code was not 200, then it failed.
    if (http.get_LastStatus() != 200) {
        wprintf(L"Response Status Code = %d\n",http.get_LastStatus());
        wprintf(L"Failed.\n");
        return;
    }

    // If we got here, then the file was successfully downloaded.
    wprintf(L"Download from OneDrive successful.\n");
    wprintf(L"The file is contained in sbXml.\n");
    }