(Delphi DLL) 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 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, JsonArray, FileAccess, Rest, JsonObject, Cache, CkByteData;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
gAuth: HCkAuthGoogle;
rest: HCkRest;
bAutoReconnect: Boolean;
json: HCkJsonObject;
gdCache: HCkCache;
folderId: PWideChar;
parents: HCkJsonArray;
fac: HCkFileAccess;
jpgBytes: HCkByteData;
jsonResponse: PWideChar;

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);

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

// Specify each part of the request.

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

// Construct the JSON that will contain the metadata about the file data to be uploaded...
json := CkJsonObject_Create();
CkJsonObject_AppendString(json,'name','hedgehogs.jpg');
CkJsonObject_AppendString(json,'description','A cute photo of two hedgehogs.');
CkJsonObject_AppendString(json,'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 := CkCache_Create();
CkCache_putLevel(gdCache,0);
CkCache_AddRoot(gdCache,'C:/ckCache/googleDrive');

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

parents := CkJsonObject_AppendArray(json,'parents');
CkJsonArray_AddStringAt(parents,-1,folderId);
CkJsonArray_Dispose(parents);

CkRest_SetMultipartBodyString(rest,CkJsonObject__emit(json));

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

fac := CkFileAccess_Create();
jpgBytes := CkByteData_Create();
// Read a JPG file from the local filesystem.
success := CkFileAccess_ReadEntireFile(fac,'qa_data/jpg/hedgehogs.jpg',jpgBytes);

// Add the bytes to our upload
CkRest_SetMultipartBodyBinary(rest,jpgBytes);

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

// Show the JSON response.
CkJsonObject_Load(json,jsonResponse);

// Show the full JSON response.
CkJsonObject_putEmitCompact(json,False);
Memo1.Lines.Add(CkJsonObject__emit(json));

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

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

CkAuthGoogle_Dispose(gAuth);
CkRest_Dispose(rest);
CkJsonObject_Dispose(json);
CkCache_Dispose(gdCache);
CkFileAccess_Dispose(fac);
CkByteData_Dispose(jpgBytes);

end;