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POJavascript: Send Array of ints through node.js binary websockets
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  1. POJavascript: Send Array of ints through node.js binary websockets
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    copied!<p>I have the following case. I capture a webcam frame via a canvas with <code>context.getImageData().data</code>. That gives me a nice Array (or UInt8ClampedArray says Bidelman) of ints like <code>[r, g, b, a, r, g, b, a, r, g, b, a, etc.]</code> when I <code>console.log()</code> them. Now I want to send this to a node.js server via binaryjs and of course the data get's scrambled like hell: <a href="https://gist.github.com/thgie/6550638" rel="nofollow">https://gist.github.com/thgie/6550638</a></p> <p>How can I convert the Array to something binary first or how do I get the binary back to a readable array?</p> <p><strong>Code examples</strong></p> <p>Client:</p> <pre><code>client.send(ctx.getImageData(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT).data, {'id': 'bin', 'frame': frame}); </code></pre> <p>Server:</p> <pre><code>client.on('stream', function(stream, meta){ var bufs = []; stream.on('data', function(data){ bufs.push(data); }); stream.on('end', function(){ var buf = Buffer.concat(bufs); fs.writeFile(__dirname + "/tmp/"+meta.frame+".dat", buf, "binary", function(err) { if(err) { console.log(err); } else { console.log("The file was saved!"); } }); }); } </code></pre> <p>It will look like this:</p> <pre><code>H&gt;DÿNDJÿL@FÿPCJÿR@KÿQ?IÿLDPÿKCOÿMCKÿLAIÿL@DÿL@DÿLBGÿKAFÿIAHÿLDLÿLAIÿLAIÿO@IÿO@IÿIAJÿJBKÿMCIÿNDJÿQEIÿQEIÿPGHÿOFGÿMIHÿMIHÿPDFÿNCEÿIBDÿLEHÿPDFÿPDFÿMHLÿLGKÿMHLÿNIMÿOGLÿNFKÿOEMÿPFNÿRFSÿPERÿPERÿPERÿRGOÿSHPÿSGMÿSGMÿRJRÿQIPÿQJNÿRKPÿRKPÿQJNÿSGMÿSGMÿOHJÿSLOÿQJLÿRKMÿSIJÿTKKÿQLPÿPJNÿSLQÿRKPÿSLQÿUMRÿSKSÿUMTÿVMWÿSKUÿUJUÿRGQÿUMTÿUMTÿSKUÿVMWÿSMTÿSMTÿQNVÿQNVÿSMVÿTNWÿZMVÿXKTÿUJUÿVKVÿTOSÿTOSÿWQUÿWQUÿYTVÿYTVÿXRVÿUPTÿYSZÿYSZÿXRVÿZUYÿWPRÿYRTÿWRQÿXSRÿVOOÿWPPÿXRVÿXRVÿZOYÿ[P[ÿZO[ÿ\Q^ÿZT_ÿZT_ÿZV`ÿZV`ÿ]T^ÿ]T^ÿ^TZÿ`V[ÿ[VXÿ[VXÿ]UZÿ^V[ÿZV`ÿ[Waÿ_Xdÿ_Xdÿ]X`ÿ]X`ÿaZ_ÿaZ_ÿ_Y]ÿ`[_ÿ`Y] </code></pre>
 

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