(Delphi DLL) List all Folders

Demonstrates how to retrieve a list of all folders.

Note: Let's say we have a directory tree with the following folders in Google Drive:

/AAWorkArea
/AAWorkArea/FolderA
/AAWorkArea/FolderB
/Folder2
/Folder2/FolderA

This would be our result. Notice that the "name" of each folder is NOT the full path, but just the final folder name. To distinguish between the two FolderA's, we would need to get the parent information for each.

---- Page 1 ----
name: FolderB
id: 1ep8p9wsCV8S_xTI7G1-qEuf8RNO_9250
mimeType: application/vnd.google-apps.folder
-
name: FolderA
id: 1h_BWJGEn7L7aFV5SN8iOKv91uxddTbY8
mimeType: application/vnd.google-apps.folder
-
name: Folder2
id: 1cvDIF78KSDuUyrU_VCKRSRbmENWkHNqV
mimeType: application/vnd.google-apps.folder
-
name: AAWorkArea
id: 0BzXkF-yZEO0-ank3VndfZTZsdlk
mimeType: application/vnd.google-apps.folder
-
name: FolderA
id: 1Fksv-TfA1ILii1YjXsNa1-rDu8Cdrg72
mimeType: application/vnd.google-apps.folder
-

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, AuthGoogle, JsonObject, Rest;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
gAuth: HCkAuthGoogle;
rest: HCkRest;
bAutoReconnect: Boolean;
json: HCkJsonObject;
i: Integer;
numFiles: Integer;
jsonResponse: PWideChar;
pageNumber: Integer;
pageToken: PWideChar;
bContinueLoop: Boolean;
bHasMorePages: Boolean;

begin
success := True;

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

// This example uses a previously obtained access token having permission for the 
// Google Drive scope.

gAuth := CkAuthGoogle_Create();
CkAuthGoogle_putAccessToken(gAuth,'GOOGLE-DRIVE-ACCESS-TOKEN');

rest := CkRest_Create();

// Connect using TLS.
bAutoReconnect := True;
success := CkRest_Connect(rest,'www.googleapis.com',443,True,bAutoReconnect);

// Provide the authentication credentials (i.e. the access token)
CkRest_SetAuthGoogle(rest,gAuth);

// Get 50 results per page for testing.  (The default page size is 100, with a max of 1000.
CkRest_AddQueryParam(rest,'pageSize','50');

// Get all entries that are folders.
CkRest_AddQueryParam(rest,'q','mimeType = ''application/vnd.google-apps.folder''');

json := CkJsonObject_Create();
CkJsonObject_putEmitCompact(json,False);

// Send the request for the 1st page.
jsonResponse := CkRest__fullRequestNoBody(rest,'GET','/drive/v3/files');

pageNumber := 1;

bContinueLoop := CkRest_getLastMethodSuccess(rest) and (CkRest_getResponseStatusCode(rest) = 200);

while bContinueLoop = True do
  begin

    Memo1.Lines.Add('---- Page ' + IntToStr(pageNumber) + ' ----');

    // Iterate over each file in the response and show the name, id, and mimeType.
    CkJsonObject_Load(json,jsonResponse);

    numFiles := CkJsonObject_SizeOfArray(json,'files');
    i := 0;
    while i < numFiles do
      begin
        CkJsonObject_putI(json,i);
        Memo1.Lines.Add('name: ' + CkJsonObject__stringOf(json,'files[i].name'));
        Memo1.Lines.Add('id: ' + CkJsonObject__stringOf(json,'files[i].id'));
        Memo1.Lines.Add('mimeType: ' + CkJsonObject__stringOf(json,'files[i].mimeType'));
        Memo1.Lines.Add('-');
        i := i + 1;
      end;

    // Get the next page of files.
    // If the "nextPageToken" is present in the JSON response, then use it in the "pageToken" parameter
    // for the next request.   If no "nextPageToken" was present, then this was the last page of files.
    pageToken := CkJsonObject__stringOf(json,'nextPageToken');
    bContinueLoop := False;
    bHasMorePages := CkJsonObject_getLastMethodSuccess(json);
    if (bHasMorePages = True) then
      begin
        CkRest_ClearAllQueryParams(rest);
        CkRest_AddQueryParam(rest,'pageSize','50');
        CkRest_AddQueryParam(rest,'pageToken',pageToken);
        CkRest_AddQueryParam(rest,'q','mimeType = ''application/vnd.google-apps.folder''');

        jsonResponse := CkRest__fullRequestNoBody(rest,'GET','/drive/v3/files');
        bContinueLoop := CkRest_getLastMethodSuccess(rest) and (CkRest_getResponseStatusCode(rest) = 200);
        pageNumber := pageNumber + 1;
      end;

  end;

if (CkRest_getLastMethodSuccess(rest) <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

// A successful response will have a status code equal to 200.
if (CkRest_getResponseStatusCode(rest) <> 200) then
  begin
    Memo1.Lines.Add('response status code = ' + IntToStr(CkRest_getResponseStatusCode(rest)));
    Memo1.Lines.Add('response status text = ' + CkRest__responseStatusText(rest));
    Memo1.Lines.Add('response header: ' + CkRest__responseHeader(rest));
    Memo1.Lines.Add('response JSON: ' + jsonResponse);
    Exit;
  end;

CkAuthGoogle_Dispose(gAuth);
CkRest_Dispose(rest);
CkJsonObject_Dispose(json);

end;