B4J Question send more data to the client with the same call

[Roberto P.]

I created an app with B4J that exchanges data with the client, with the stream of binary objects (see example:https://www.b4x.com/android/forum/t...device-desktop-and-web-reports.37254/#content)

I need to be able to send data to the server several times, but this is not possible because the stream is closed and does not allow sending data.

How can I manage the stream so that it closes?

Here's an example of code that I want to achieve

Sub Handle(req As ServletRequest, resp As ServletResponse)

 for i = 0 to 10
       dim myObject as CMyObject
       myObject.inizialize
     
      myObject.calulate(params...)

       SendObject(myObject, resp.OutputStream)

next

End Sub

in this example, it is sent only the first call.

I hope I was clear.
thank you

 

[Erel]

This is how http requests work. The client sends a request and the server responds.

You can use WebSockets if you want to maintain an open, bi-directional connection.

 

[Roberto P.]

hello Erel,
thanks for the reply
I know just the web ... socket can also be used without webpages? or to exchange data between the server and the app B4J B4A?

there is an example to exchange data between the two systems?

this would be a good solution, for other needs.

thank you
roberto

 

[Roberto P.]

Erel,
I found this example: https://www.b4x.com/android/forum/threads/websocket-client-library.40221/#content

do you think is okay? Can I use it to transfer objects?

I see that after some time times out.

 

[Roberto P.]

I did a test and there are limitations in the size of the parameters.

there is a way to overcome the limits and send via socket size data also some MB?

 

[Erel]

I wouldn't use the web socket to send large objects.

However you can combine both solutions. Maintain an active web socket connection and use a regular handler to upload or download large objects.

 

[Roberto P.]

Hello Erel,
I understand, I see if I can do this combined management. However, we have to open two doors and manage two separate connections.

 

[Erel]

Not sure what you mean with two doors. It is just another handler in the same server.

See the WebSocket file upload example: http://b4x.com:51042/websocket_with_fileupload/index.html