Chilkat Examples

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Delphi ActiveX Examples


ASN.1
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(Delphi ActiveX) Delete All Files

Permanently deletes all files owned by the user without moving it to the trash.

This example works by first getting a list of all fileIds, and then iterating over the list to delete each file.

See Google Drive Files delete for more information.

Chilkat for Delphi Downloads

Chilkat ActiveX DLL for Delphi

Chilkat non-ActiveX DLL for Delphi

* The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_v9_5_0_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
gAuth: TChilkatAuthGoogle;
rest: TChilkatRest;
bAutoReconnect: Integer;
json: TChilkatJsonObject;
i: Integer;
numFiles: Integer;
jsonResponse: WideString;
pageNumber: Integer;
pageToken: WideString;
bContinueLoop: Integer;
fileId: WideString;
saFileIds: TCkStringArray;
bHasMorePages: Integer;
sbPath: TChilkatStringBuilder;

begin
success := 1;

//  It 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 := TChilkatAuthGoogle.Create(Self);
gAuth.AccessToken := 'GOOGLE-DRIVE-ACCESS-TOKEN';

rest := TChilkatRest.Create(Self);

//  Connect using TLS.
bAutoReconnect := 1;
success := rest.Connect('www.googleapis.com',443,1,bAutoReconnect);

//  Provide the authentication credentials (i.e. the access token)
rest.SetAuthGoogle(gAuth.ControlInterface);

//  Get 10 results per page for testing.  (The default page size is 100, with a max of 1000.
rest.AddQueryParam('pageSize','10');

json := TChilkatJsonObject.Create(Self);

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

pageNumber := 1;

bContinueLoop := rest.LastMethodSuccess and (rest.ResponseStatusCode = 200);

saFileIds := TCkStringArray.Create(Self);

while bContinueLoop = 1 do
  begin

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

    numFiles := json.SizeOfArray('files');
    i := 0;
    while i < numFiles do
      begin
        json.I := i;
        fileId := json.StringOf('files[i].id');
        Memo1.Lines.Add('name: ' + json.StringOf('files[i].name'));
        Memo1.Lines.Add('id: ' + fileId);
        saFileIds.Append(fileId);
        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 := json.StringOf('nextPageToken');
    bContinueLoop := 0;
    bHasMorePages := json.LastMethodSuccess;
    if (bHasMorePages = 1) then
      begin
        rest.ClearAllQueryParams();
        rest.AddQueryParam('pageSize','10');
        rest.AddQueryParam('pageToken',pageToken);
        jsonResponse := rest.FullRequestNoBody('GET','/drive/v3/files');
        bContinueLoop := rest.LastMethodSuccess and (rest.ResponseStatusCode = 200);
        pageNumber := pageNumber + 1;
      end;

  end;

//  Before actually deleting, check for errors...
if (rest.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

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

//  OK, we have the full list of files.  Delete each..
sbPath := TChilkatStringBuilder.Create(Self);
numFiles := saFileIds.Count;
i := 0;
while i < numFiles do
  begin
    fileId := saFileIds.GetString(i);

    rest.ClearAllQueryParams();

    sbPath.Clear();
    sbPath.Append('/drive/v3/files/');
    sbPath.Append(fileId);

    jsonResponse := rest.FullRequestNoBody('DELETE',sbPath.GetAsString());
    if (rest.LastMethodSuccess <> 1) then
      begin
        Memo1.Lines.Add(rest.LastErrorText);
        Exit;
      end;

    //  A successful response will have a status code equal to 204 and the response body is empty.
    //  (If not successful, then there should be a JSON response body with information..)
    if (rest.ResponseStatusCode <> 204) then
      begin
        Memo1.Lines.Add('response status code = ' + IntToStr(rest.ResponseStatusCode));
        Memo1.Lines.Add('response status text = ' + rest.ResponseStatusText);
        Memo1.Lines.Add('response header: ' + rest.ResponseHeader);
        Memo1.Lines.Add('response JSON: ' + jsonResponse);
        Exit;
      end;

    i := i + 1;
    Memo1.Lines.Add(IntToStr(i) + ': Deleted ' + fileId);
  end;

Memo1.Lines.Add('All Files Deleted.');
end;

 

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