(Delphi DLL) OneDrive -- List Drives

Example to retrieve the list of Drive resources available for a target User or Group.

Note: This example requires Chilkat v9.5.0.68 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, JsonObject, Http;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: HCkHttp;
resp: PWideChar;
json: HCkJsonObject;
i: Integer;
numDrives: Integer;

begin
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

http := CkHttp_Create();

// 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.)
CkHttp_putAuthToken(http,'MICROSOFT_GRAPH_ACCESS_TOKEN');

// Sends the following GET request:
// GET https://graph.microsoft.com/v1.0/me/drives

resp := CkHttp__quickGetStr(http,'https://graph.microsoft.com/v1.0/me/drives');
if (CkHttp_getLastMethodSuccess(http) <> True) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

// The response should be JSON.
json := CkJsonObject_Create();
CkJsonObject_putEmitCompact(json,False);
CkJsonObject_Load(json,resp);

// A successful response should return a status code of 200.
if (CkHttp_getLastStatus(http) <> 200) then
  begin
    Memo1.Lines.Add(CkJsonObject__emit(json));
    Memo1.Lines.Add('Response status = ' + IntToStr(CkHttp_getLastStatus(http)));
    Exit;
  end;

Memo1.Lines.Add(CkJsonObject__emit(json));

// Sample output:

// 	{
// 	  "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#drives",
// 	  "value": [
// 	    {
// 	      "id": "3a33fceb9b74cc15",
// 	      "driveType": "personal",
// 	      "owner": {
// 	        "user": {
// 	          "displayName": "Matt Smith",
// 	          "id": "3a33fceb9b74cc15"
// 	        }
// 	      },
// 	      "quota": {
// 	        "deleted": 0,
// 	        "remaining": 1114571275977,
// 	        "state": "normal",
// 	        "total": 1115617755136,
// 	        "used": 1046479159
// 	      }
// 	    }
// 	  ]
// 	}

// Iterate over the drives in the JSON response:
i := 0;
numDrives := CkJsonObject_SizeOfArray(json,'value');
while i < numDrives do
  begin
    CkJsonObject_putI(json,i);
    Memo1.Lines.Add('-- Drive ' + IntToStr(i + 1));
    Memo1.Lines.Add('id: ' + CkJsonObject__stringOf(json,'value[i].id'));
    // The size will be a number larger than what can fit in a 32-bit integer.
    // Get the integer as a string..
    Memo1.Lines.Add('total: ' + CkJsonObject__stringOf(json,'value[i].quota.total'));
    i := i + 1;
  end;

CkHttp_Dispose(http);
CkJsonObject_Dispose(json);

end;