无法使用Xamarin.UITest截屏

Question

我正在Windows 7上使用Andorid模拟器和Android设备运行Xamarin.UITest测试。在两种情况下，我都无法截图。

我正在初始化这样的事情：

ConfigureApp
    .Android
    .ApkFile(apkPath)
    .EnableLocalScreenshots()
    .StartApp();

并拍摄这样的屏幕截图：

App.Screenshot("App Started");

但是，当调用App.Screenshot时出现此异常：

System.Exception : Error while performing Screenshot("App Started")
  ----> System.Exception : Failed to create C:\Users\USERNAME\.nuget\packages\xamarin.uitest\3.0.3\lib\net45\screenshot-1.png. You may need to set the working directory, which can be done using System.IO.Directory.SetCurrentDirectory().
   at Xamarin.UITest.Utils.ErrorReporting.With[T](Func`1 func, Object[] args, String memberName)
   at Xamarin.UITest.Android.AndroidApp.Screenshot(String title)
   at ACME.App.UITest.BaseUITest.BeforeEachTest() in C:\ACME\ACME.Application.UITest\BaseUITest.cs:line 29
   at NUnit.Framework.Internal.TaskAwaitAdapter.GenericAdapter`1.GetResult() in D:\a\1\s\src\NUnitFramework\framework\Internal\TaskAwaitAdapter.cs:line 99
   at NUnit.Framework.Internal.AsyncToSyncAdapter.Await(Func`1 invoke) in D:\a\1\s\src\NUnitFramework\framework\Internal\AsyncToSyncAdapter.cs:line 60
   at NUnit.Framework.Internal.Commands.SetUpTearDownItem.RunSetUpOrTearDownMethod(TestExecutionContext context, MethodInfo method) in D:\a\1\s\src\NUnitFramework\framework\Internal\Commands\SetUpTearDownItem.cs:line 111
   at NUnit.Framework.Internal.Commands.SetUpTearDownItem.RunSetUp(TestExecutionContext context) in D:\a\1\s\src\NUnitFramework\framework\Internal\Commands\SetUpTearDownItem.cs:line 68
   at NUnit.Framework.Internal.Commands.SetUpTearDownCommand.<>c__DisplayClass0_0.<.ctor>b__0(TestExecutionContext context) in D:\a\1\s\src\NUnitFramework\framework\Internal\Commands\SetUpTearDownCommand.cs:line 48
   at NUnit.Framework.Internal.Commands.BeforeAndAfterTestCommand.<>c__DisplayClass1_0.<Execute>b__0() in D:\a\1\s\src\NUnitFramework\framework\Internal\Commands\BeforeAndAfterTestCommand.cs:line 58
   at NUnit.Framework.Internal.Commands.BeforeAndAfterTestCommand.RunTestMethodInThreadAbortSafeZone(TestExecutionContext context, Action action) in D:\a\1\s\src\NUnitFramework\framework\Internal\Commands\BeforeAndAfterTestCommand.cs:line 73
--Exception
   at Xamarin.UITest.Android.JavaScreenshotTaker.Screenshot(String title)
   at Xamarin.UITest.Android.AndroidApp.<>c__DisplayClass84_0.<Screenshot>b__0()
   at Xamarin.UITest.Utils.ErrorReporting.With[T](Func`1 func, Object[] args, String memberName)

查看生成的日志文件，我看到：

Could not take screenshot
java.io.IOException: EOF
    at com.android.ddmlib.AdbHelper.read(AdbHelper.java:874)
    at com.android.ddmlib.AdbHelper.getFrameBuffer(AdbHelper.java:333)
    at com.android.ddmlib.CalabashAdbHelper.getFrameBuffer(Unknown Source)
    at com.android.ddmlib.CalabashDevice.getScreenshot(Unknown Source)
    at sh.calaba.screenshot.ScreenshotTaker.takeScreenshot(Unknown Source)
    at sh.calaba.screenshot.ScreenshotTaker.main(Unknown Source)

我尝试过的：

• 使用Directory.SetCurrentDirectory()设置其他目录-这似乎被忽略了，因为无论（C:\Users\USERNAME\.nuget\packages\xamarin.uitest\...），我在Exception中都看到相同的路径
• 授予Everyone组访问路径C:\Users\USERNAME\.nuget\packages\xamarin.uitest\3.0.3\lib\net45\-无效
• 确保测试可以将文件写入上述路径-可以，因此不应该是权限问题
• 更新到最新版本的Xamarin.UITest，3.0.4-dev1-相同的结果

Answer 1

本周我遇到了同样的问题，这与安全性改进有关，以避免在应用程序上截屏。如果您执行了此操作（https://forums.xamarin.com/discussion/96818/disable-the-screenshot-functionality-in-xamarin-forms-application），则可能是问题所在。仅需#if！DEBUG，您就可以修复它。

希望能帮助别人。