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POHow to take a picture with MediaCapture in Enyo (webOS)?
 

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  1. POHow to take a picture with MediaCapture in Enyo (webOS)?
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    <p>I'm a kind of newbie webOS Developer, and I'm currently developing an App where I need to take a picture of a certain user.</p> <p>I've been looking for many resources and sites on the internet but I can't find a solution for my problem.</p> <p>I follow the instructions that list here: </p> <p><a href="https://stackoverflow.com/questions/7509675/how-to-take-a-picture-using-command-line-on-webos-on-hp-touchpad">How to take a picture using command line on webOS on HP touchpad?</a></p> <p>I want to let clear that I don't want to take the photo from the command line.</p> <p>I tried the following:</p> <p><strong>A. Include in my depends.js</strong></p> <pre><code>"$enyo/../lib/mediacapture/" </code></pre> <p><strong>B. In my scene</strong></p> <pre><code>enyo.kind({ name: "MyComponent", kind: "Pane", components: [ { kind: "enyo.MediaCapture", name: "mediaCapture", onInitialized: "onImageCaptureInitialized", onError: "onImageCaptureError", onImageCaptureComplete: "onImageCaptureComplete" } ], ... .. . }); </code></pre> <p><strong>C. Inside the onCreate function</strong></p> <pre><code>create: function () { this.inherited(arguments); this.$.mediaCapture.initialize(this.$.ViewPort); }, </code></pre> <p><strong>D. Inside the onInitialized Event</strong></p> <pre><code>onImageCaptureInitialized: function () { var keyString; for(var i = 0; i &lt; this.pb.deviceKeys.length; i++) { if(this.pb.deviceKeys[i].description.indexOf("Camera/Camcorder") &gt;= 0) { keyString = this.pb.deviceKeys[i].deviceUri; break; } } if(keyString) { var formatObj = {imageCaptureFormat: this.pb[keyString].supportedImageFormats[0]}; this.$.mediaCapture.load(keyString, formatObj); } }, </code></pre> <p><strong>D. Inside the onclick Event of a certain button</strong></p> <pre><code>takePhotoClickEvent: function (inSender) { this.$.mediaCapture.startImageCapture("/media/internal/CanalCocina/recipe_photo.jpg", { "bitrate":128000, "samplerate":8000, "width":480, "height":320, "mimetype":"image/jpeg", "codecs":"jpeg"} ); }, </code></pre> <p>When I run the app on the HP TouchPad I get the next log in my console:</p> <blockquote> <p>info: MediaCapture::ServiceProxy ===== MediaCapture::_initializeMediaServerInstanceSuccess() ...palm://com.palm.mediad.MediaCaptureV3_1814440/, /usr/palm/frameworks/enyo/1.0/framework/lib/mediacapture/helper/MediaCaptureProxyHelper.js:83 [20111017-16:52:32.906482] info: MediaCapture::ServiceProxy @@@@@@----------- FIRST PROPERTY GRAB -----------@@@@@@, /usr/palm/frameworks/enyo/1.0/framework/lib/mediacapture/helper/MediaCaptureProxyHelper.js:106 [20111017-16:52:32.913991] info: MediaCapture::ServiceProxy inResponse: {"propertyValues":[{"name":"ready","value":false},{"name":"supportedAudioFormats","value":[{"bitrate":128000,"samplerate":8000,"width":0,"height":0,"mimetype":"audio/vnd.wave","codecs":"1"},{"bitrate":256000,"samplerate":16000,"width":0,"height":0,"mimetype":"audio/vnd.wave","codecs":"1"},{"bitrate":705600,"samplerate":44100,"width":0,"height":0,"mimetype":"audio/vnd.wave","codecs":"1"},{"bitrate":128000,"samplerate":8000,"width":0,"height":0,"mimetype":"audio/vnd.wave","codecs":"1"},{"bitrate":256000,"samplerate":16000,"width":0,"height":0,"mimetype":"audio/vnd.wave","codecs":"1"},{"bitrate":705600,"samplerate":44100,"width":0,"height":0,"mimetype":"audio/vnd.wave","codecs":"1"},{"bitrate":128000,"samplerate":8000,"width":0,"height":0,"mimetype":"audio/vnd.wave","codecs":"1"},{"bitrate":256000,"samplerate":16000,"width":0,"height":0,"mimetype":"audio/vnd.wave","codecs":"1"},{"bitrate":705600,"sampl</p> </blockquote> <p>However when the app tries to load the mediaCapture Object I get:</p> <blockquote> <p>Uncaught TypeError: Cannot read property 'deviceKeys' of undefined, source/CCRecipesStep1View.js:186</p> </blockquote> <p>I know and I understand that this error is because the App try to access a property that doesn't exist. In this case the particular line is:</p> <pre><code>onImageCaptureInitialized: function () { var keyString; for(var i = 0; i &lt; this.pb.deviceKeys.length; i++) &lt;&lt;------------ Here ... .. . } </code></pre> <p>The file MediaCapture.js and the instructions I follow talk about the <strong>"Property Bag"</strong> , I understand that this is where you declare the properties, however I don't know how to get the device keys that I need to load the MediaCaptureObject.</p> <p>When the button is pressed I get:</p> <blockquote> <p>MediaCapture::ServiceProxy #######----------- CHANGE PROPERTIES EVENT -----------######vuData , /usr/palm/frameworks/enyo/1.0/framework/lib/mediacapture/helper/MediaCaptureProxyHelper.js:140 [20111017-17:07:35.401836] info: MediaCapture::ServiceProxy</p> #----------- CHANGE PROPERTIES EVENT -----------######vuData , <p>/usr/palm/frameworks/enyo/1.0/framework/lib/mediacapture/helper/MediaCaptureProxyHelper.js:140 [20111017-17:07:35.653586] info: MediaCapture::ServiceProxy</p> #----------- CHANGE PROPERTIES EVENT -----------######vuData , <p>/usr/palm/frameworks/enyo/1.0/framework/lib/mediacapture/helper/MediaCaptureProxyHelper.js:140 [20111017-17:07:35.885940] info: MediaCapture::ServiceProxy</p> #----------- CHANGE PROPERTIES EVENT -----------######vuData , <p>/usr/palm/frameworks/enyo/1.0/framework/lib/mediacapture/helper/MediaCaptureProxyHelper.js:140</p> </blockquote> <p>And start an infinite loop :S</p> <p>I hope you cal help me. This App is very important.</p> <p>Thank you.</p>
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