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POHow to Navigate to CameraCaptureTask from LensPicker
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copied!<p>I have created a small sample Lens application, and I would like to be able to directly navigate to the CameraCaptureTask when the Lens icon is clicked in the default camera application. In my application I am already calling the CameraCaptureTask within a button click event during normal app operations. How might I set this up to work as well from the LensPicker option?</p> <p>I have been referencing <a href="http://msdn.microsoft.com/en-us/library/windowsphone/develop/jj662936(v=vs.105).aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/windowsphone/develop/jj662936(v=vs.105).aspx</a></p> <p>LensExampleUriMapper.cs</p> <pre><code>private string tempUri; public override Uri MapUri(Uri uri) { tempUri = uri.ToString(); // Look for a URI from the lens picker. if (tempUri.Contains("ViewfinderLaunch")) { // Launch as a lens, launch viewfinder screen. return new Uri("/MainPage.xaml", UriKind.Relative); } // Otherwise perform normal launch. return uri; } </code></pre> <p>I was thinking of passing a QueryString value in <code>return new Uri("/MainPage.xaml", UriKind.Relative);</code> so that in my MainPage <code>OnNavigatedTo</code> event I could check that QueryString value and call the CameraCaptureTask, and then just route the result to the already existing event handler I have created (which displays the resulting image in MainPage). For some reason I am getting a debugging error when trying to create the QueryString to pass, and I am unsure of why? </p> <p>EDIT** No longer getting error, but an infinite loop occurs when calling CameraCaptureTask. Why?</p> <p>LensExampleUriMapper.cs</p> <pre><code>private string tempUri; public override Uri MapUri(Uri uri) { tempUri = uri.ToString(); // Look for a URI from the lens picker. if (tempUri.Contains("ViewfinderLaunch")) { // Launch as a lens, launch viewfinder screen. return new Uri("/MainPage.xaml?fromLensPicker=" + "fromLensPicker", UriKind.Relative); } // Otherwise perform normal launch. return uri; } </code></pre> <p>MainPage.xaml.cs</p> <pre><code>protected override void OnNavigatedTo(NavigationEventArgs e) { string fromLensPicker = null; if (NavigationContext.QueryString.TryGetValue("fromLensPicker", out fromLensPicker)) { if (fromLensPicker == "fromLensPicker") { newButton_Click(null, null); //click event that calls CameraCaptureTask fromLensPicker = null; //Temporarily nullifies value until MainPage is OnNavigatedTo after CameraCaptureTask completes } } } </code></pre> <p>I believe that when <code>CameraCaptureTask</code> is called, the application is tombstoned and then resumed on MainPage, in which the <code>QueryString</code> value <code>fromLensPicker == "fromLensPicker"</code> and the entire cycle starts over again, repetitively. How might I solve this?</p>

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