(Delphi ActiveX) Upload Binary File from Memory

This example demonstrates how to upload a binary file from memory. It uploads the file to a subdirectory of our choosing.

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_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
gAuth: TChilkatAuthGoogle;
rest: TChilkatRest;
bAutoReconnect: Integer;
json: TChilkatJsonObject;
gdCache: TChilkatCache;
folderId: WideString;
parents: IChilkatJsonArray;
fac: TCkFileAccess;
jpgBytes: Array of Byte;
jsonResponse: WideString;

begin
success := 1;

// 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 := 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);

// -------------------------------------------------------------------------
// A multipart upload to Google Drive needs a multipart/related Content-Type
rest.AddHeader('Content-Type','multipart/related');

// Specify each part of the request.

// The 1st part is JSON with information about the file.
rest.PartSelector := '1';
rest.AddHeader('Content-Type','application/json; charset=UTF-8');

// Construct the JSON that will contain the metadata about the file data to be uploaded...
json := TChilkatJsonObject.Create(Self);
json.AppendString('name','hedgehogs.jpg');
json.AppendString('description','A cute photo of two hedgehogs.');
json.AppendString('mimeType','image/jpeg');

// To place the file in a folder, we must add a parents[] array to the JSON
// and add the folder ID.  
// In a previous example (see Build Local Metadata Cache
// we built a local cache to make it easy to lookup file IDs given a file path.
// Let's find the file ID for the folder "testFolder/abc/123"
gdCache := TChilkatCache.Create(Self);
gdCache.Level := 0;
gdCache.AddRoot('C:/ckCache/googleDrive');

folderId := gdCache.FetchText('testFolder/abc/123');
if (gdCache.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add('Filepath not found in cache.');
    Exit;
  end;

parents := json.AppendArray('parents');
parents.AddStringAt(-1,folderId);

rest.SetMultipartBodyString(json.Emit());

// The 2nd part is the file content, which will contain the binary image data.
rest.PartSelector := '2';
rest.AddHeader('Content-Type','image/jpeg');

fac := TCkFileAccess.Create(Self);

// Read a JPG file from the local filesystem.
jpgBytes := fac.ReadEntireFile('qa_data/jpg/hedgehogs.jpg');

// Add the bytes to our upload
rest.SetMultipartBodyBinary(jpgBytes);

jsonResponse := rest.FullRequestMultipart('POST','/upload/drive/v3/files?uploadType=multipart');
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;

// Show the JSON response.
json.Load(jsonResponse);

// Show the full JSON response.
json.EmitCompact := 0;
Memo1.Lines.Add(json.Emit());

// A successful response looks like this:
// {
//   "kind": "drive#file",
//   "id": "0B53Q6OSTWYoldmJ0Z3ZqT2x5MFk",
//   "name": "hedgehogs.jpg",
//   "mimeType": "image/jpeg"
// }

// Get the fileId:
Memo1.Lines.Add('fileId: ' + json.StringOf('id'));
end;