CODEWITHSUNDEEP
c++websocketserver-push
Eisen Jack
Eisen Jack

Reputation: 179

Unable to send binary data over WebSockets

I am developing a viewer application, in which server captures image, perform some image processing operations and this needs to be shown at the client end, on HTML5 canvas. The server that I've written is in VC++ and uses http://www.codeproject.com/Articles/371188/A-Cplusplus-Websocket-server-for-realtime-interact.

So far I've implemented the needed functionality. Now all I need to do is Optimization. Reference was a chat application which was meant to send strings, and so I was encoding data into 7-bit format. Which is causing overhead. I need binary data transfer capability. So I modified the encoding and framing (Now opcode is 130, for binary messages instead of 129.) and I can say that server part is alright. I've observed the outgoing frame, it follows protocol. I'm facing problem in the client side.

Whenever the client receives the incoming message, if all the bytes are within limits (0 to 127) it calls onMessage() and I can successfully decode the incoming message. However even a single introduction of character which is >127 causes the client to call onClose(). The connection gets closed and I am unable to find cause. Please help me out.

PS: I'm using chrome 22.0 and Firefox 17.0

Upvotes: 3

Views: 2053

Answers (2)

kanaka
kanaka

Reputation: 73119

How did you observe the outgoing frame and what were the header bytes that you observed? It sounds like you may not actually be setting the binary opcode successfully, and this is triggering UTF-8 validation in the browser which fails.

Upvotes: 1

dathor
dathor

Reputation: 174

Looks like your problem is related to how you assemble your frames? As you have an established connection that terminates when the onmessage event is about to fire, i asume that it is frame related?

What if you study the network -> WebSocket -> frame of your connection i Google Chrome? what does it say?

it may be out-of-scope for you ?, but im one of the developers of XSockets.NET (C#) framework, we have binary support there, if you are interested there is an example that i happend to publish just recently, it can be found on https://github.com/MagnusThor/XSockets.Binary.Controller.Example

Upvotes: 1

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