(Delphi DLL) OneDrive -- Download Text File to Memory

See more OneDrive Examples

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

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Http, StringBuilder, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
json: HCkJsonObject;
http: HCkHttp;
sbXml: HCkStringBuilder;
expectedCharset: PWideChar;
url: PWideChar;
success: Boolean;

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

http := CkHttp_Create();
CkHttp_putAuthToken(http,CkJsonObject__emit(json));

// 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
CkHttp_putFollowRedirects(http,True);

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

sbXml := CkStringBuilder_Create();
expectedCharset := 'utf-8';
url := 'https://graph.microsoft.com/v1.0/users/{$user_id}/drive/root:/{$item_path}:/content';
success := CkHttp_DownloadSb(http,url,expectedCharset,sbXml);
if (CkHttp_getLastMethodSuccess(http) <> True) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

// If the response status code was not 200, then it failed.
if (CkHttp_getLastStatus(http) <> 200) then
  begin
    Memo1.Lines.Add('Response Status Code = ' + IntToStr(CkHttp_getLastStatus(http)));
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

// If we got here, then the file was successfully downloaded.
Memo1.Lines.Add('Download from OneDrive successful.');
Memo1.Lines.Add('The file is contained in sbXml.');

CkJsonObject_Dispose(json);
CkHttp_Dispose(http);
CkStringBuilder_Dispose(sbXml);

end;