Delphi DLL

Search for Files in Google Drive

See more Google Drive Examples

This example follows the same methodology for listing all files in Google Drive in pages, but applies a search filter. It shows how to apply a query parameter for filtering the file results. See the Google Drive Files list for more optional HTTP parameters. Delphi 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 := False;

success := True;

// 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 := 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 5 results per page for testing.  (The default page size is 100, with a max of 1000.
CkRest_AddQueryParam(rest,'pageSize','5');

// Our search filter is to list all files containing ".jpg" (i.e. all JPG image files)
CkRest_AddQueryParam(rest,'q','name contains ''.jpg''');

json := CkJsonObject_Create();

// 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','5');
        CkRest_AddQueryParam(rest,'pageToken',pageToken);
        CkRest_AddQueryParam(rest,'q','name contains ''.jpg''');

        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;