Windows Phone 7.x |当应用程序转到后台时，如何正确关闭/暂停视频录制

Question

当我在视频录制过程中锁定手机时，我的应用程序挂起了堆栈跟踪，如下所示：

  

System.Windows.dll！MS.Internal.NativePhotoMethods.CapMan_Disconnect（int dwSeq）
      System.Windows.dll！System.Windows.Media.CaptureSource.CaptureThread（）+ 0x2dd bytes       mscorlib.dll！System.Threading.ThreadHelper.ThreadStartHelper（System.Threading.ThreadHelper t）+ 0x1d bytes
      mscorlib.dll！System.Threading.ThreadHelper.ThreadStart_Context（对象状态）+ 0xb字节
      mscorlib.dll！System.Threading.ExecutionContext.Run（System.Threading.ExecutionContext executionContext，System.Threading.ContextCallback callback，object state）+ 0x63 bytes
      mscorlib.dll！System.Threading.ThreadHelper.ThreadStartHelper（）+ 0x2a bytes

当我拨打captureSource.Stop()时（在锁定事件PhoneApplicationFrame.Obscured上），我的应用程序挂起了不同的堆栈跟踪：

  

mscorlib.dll中！System.Threading.Thread.Join（）       System.Windows.dll！System.Windows.Media.CaptureSource.StopManagedImageCapture（）+ 0x3e bytes
      System.Windows.dll！System.Windows.Media.CaptureSource.Stop（）+ 0x10 bytes
    HelloWorld.dll！HelloWorld.App.RootFrame_Obscured（object sender，Microsoft.Phone.Controls.ObscuredEventArgs e）第96行+ 0xa字节C＃       Microsoft.Phone.dll！System.Windows.Controls.Frame.FireEventHandler（System.EventHandler handler，object sender，Microsoft.Phone.Controls.ObscuredEventArgs args）+ 0xd bytes       Microsoft.Phone.dll！Microsoft.Phone.Controls.PhoneApplicationFrame.ShellPageManager_OnLockStateChange（object sender，Microsoft.Phone.Shell.Interop.LockStateChangeEventArgs args）+ 0x48 bytes
      Microsoft.Phone.Interop.dll！Microsoft.Phone.Shell.Interop.ShellPageManager.ShellPageCallback_OnLockStateChange（object source，Microsoft.Phone.Shell.Interop.LockStateChangeEventArgs e）+ 0x12 bytes
      Microsoft.Phone.Interop.dll！Microsoft.Phone.Shell.Interop.ShellPageCallback.FireOnLockStateChange（bool fLocked）+ 0x41 bytes
      [外部代码]

如何防止挂起并正确暂停/关闭CaptureSource？

Answer 1

尝试为Windows Phone实现模糊的事件

这是Obscured Event的链接

当屏幕覆盖应用程序时会触发此事件。尝试停止/暂停视频。看看它是否有效。如果没有，请留下回复