mORMot Open Source

Virion

Member

Registered: 2016-05-18

Posts: 3

MVC - serving binary file from stream

Hello!

I am new to mORMot, implementing Angular2 application and serving it via mORMot MVC. I want to serve binary file (jpg, pdf etc.) from DB blob as a response in MVC action. I do not use ORM part of the framework, so let's just say I have a TStream with data in it. I've managed to build my own "MVCViews" - view engine:

procedure TMVCViewsBinary.Render(methodIndex: Integer; const Context: Variant;
  var View: TMVCView);
var
  lStream : TStringStream;
begin
  lStream := TStringStream.Create;
  FillStreamWithImageDataFromMyDatabase(lStream, Context);

  View.ContentType := 'image/jpeg';
  View.Content := lStream.DataString;

  lStream.Free;
end;

Works fine, but - stream loading logic placed in view engine doesn't look like a good idea. I've tried to return loaded stream object directly from MVC action, but all return params are serialized before passed to view engine - obviously, I don't want stream to be serialized on it's way, just 'rendered'.

Is there a better way to achieve my goal?

ab

Administrator

From: France

Registered: 2010-06-21

Posts: 14,659

Website

Re: MVC - serving binary file from stream

Redirect to a method based service returning the blob.

Virion

Member

Registered: 2016-05-18

Posts: 3

Re: MVC - serving binary file from stream

What type should I return in service method in order to return binary data with proper MIME declaration?

igors233

Member

Registered: 2012-09-10

Posts: 241

Re: MVC - serving binary file from stream

You should return TServiceCustomAnswer, take a look at documentation for more details.

Virion

Member

Registered: 2016-05-18

Posts: 3

Re: MVC - serving binary file from stream

Works well, thank you!