Ashot - 无法在Chrome中截取特定元素的屏幕截图

时间：2018-01-11 06:35:33

标签： java selenium selenium-webdriver testng ashot

当我使用Ashot和selenium捕获特定webelement的屏幕截图时，它不起作用。我还附加了日志以供参考。

获取整页的屏幕截图正在运行。

注意：我已在评论

中更新了最新的jar

我使用Chrome驱动程序，selenium 3.8.1独立jar，Ashot 1.5.2 jar。

 @Test

public void launchBrowser() 
{        

   System.setProperty("webdriver.chrome.driver","/Applications/webdriver/chromedriver");

driver = new ChromeDriver();

    }
@Test
public void openApplication() throws IOException, InterruptedException
{

driver.get("https://myurl");

driver.manage().window().maximize();

 WebDriverWait wait = new WebDriverWait(driver, 50);
  wait.until(ExpectedConditions.visibilityOfElementLocated(By.id("commonuileftpanel")));
WebElement portal =driver.findElement(By.id("commonuileftpanel"));                                        
Screenshot myScreenshot = new AShot().takeScreenshot(driver,portal); 

BufferedImage original = myScreenshot.getImage();
BufferedImage expected = ImageIO.read(new File("/Applications/webdriver/results.png"));
ImageDiff diff = new ImageDiffer().makeDiff(original, expected);
BufferedImage difffullImage = diff.getMarkedImage();
File outputfile = new File("/Applications/webdriver/diffImage.png");
ImageIO.write(difffullImage, "PNG", outputfile);

Boolean diffval = diff.hasDiff();
Assert.assertFalse(diffval);

driver.quit();

} 

@Test
public void closeDriver() 
{
if(driver!=null) 
{
driver.close();
}

添加了截图：
enter image description here

错误讯息：

Starting ChromeDriver 2.34.522932 (4140ab217e1ca1bec0c4b4d1b148f3361eb3a03e) on port 3753
Only local connections are allowed.
Jan 12, 2018 4:02:52 PM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Detected dialect: OSS
ChromeDriver: chrome on MAC (d1a7d84c06ae31e76c872e6be1a61824)

PASSED: closeDriver
PASSED: launchBrowser
FAILED: openApplication
org.openqa.selenium.WebDriverException: unknown error: Cannot read property 'offset' of null
  (Session info: chrome=63.0.3239.132)
  (Driver info: chromedriver=2.34.522932 (4140ab217e1ca1bec0c4b4d1b148f3361eb3a03e),platform=Mac OS X 10.13.1 x86_64) (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 0 milliseconds
Build info: version: '3.8.1', revision: '6e95a6684b', time: '2017-12-01T19:05:32.194Z'
System info: host: 'test', ip: '', os.name: 'Mac OS X', os.arch: 'x86_64', os.version: '10.13.1', java.version: '1.8.0_152'
Driver info: org.openqa.selenium.chrome.ChromeDriver
Capabilities {acceptSslCerts: true, applicationCacheEnabled: false, browserConnectionEnabled: false, browserName: chrome, chrome: {chromedriverVersion: 2.34.522932 (4140ab217e1ca1..., userDataDir: /var/folders/j_/f03djz4n2bv...}, cssSelectorsEnabled: true, databaseEnabled: false, handlesAlerts: true, hasTouchScreen: false, javascriptEnabled: true, locationContextEnabled: true, mobileEmulationEnabled: false, nativeEvents: true, networkConnectionEnabled: false, pageLoadStrategy: normal, platform: MAC, platformName: MAC, rotatable: false, setWindowRect: true, takesHeapSnapshot: true, takesScreenshot: true, unexpectedAlertBehaviour: , unhandledPromptBehavior: , version: 63.0.3239.132, webStorageEnabled: true}
Session ID: d1a7d84c06ae31e76c872e6be1a61824
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:214)
    at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:166)
    at org.openqa.selenium.remote.http.JsonHttpResponseCodec.reconstructValue(JsonHttpResponseCodec.java:40)
    at org.openqa.selenium.remote.http.AbstractHttpResponseCodec.decode(AbstractHttpResponseCodec.java:80)
    at org.openqa.selenium.remote.http.AbstractHttpResponseCodec.decode(AbstractHttpResponseCodec.java:44)
    at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:164)
    at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:83)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:601)
    at org.openqa.selenium.remote.RemoteWebDriver.executeScript(RemoteWebDriver.java:537)
    at ru.yandex.qatools.ashot.util.JsCoords.findCoordsWithJquery(JsCoords.java:30)
    at ru.yandex.qatools.ashot.coordinates.JqueryCoordsProvider.ofElement(JqueryCoordsProvider.java:13)
    at ru.yandex.qatools.ashot.coordinates.CoordsProvider.ofElements(CoordsProvider.java:21)
    at ru.yandex.qatools.ashot.AShot.takeScreenshot(AShot.java:115)
    at ru.yandex.qatools.ashot.AShot.takeScreenshot(AShot.java:132)
    at ExampleSel3.screenshotParticularTag(ExampleSel3.java:187)
    at ExampleSel3.openApplication(ExampleSel3.java:96)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:124)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:571)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:707)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:979)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
    at org.testng.TestRunner.privateRun(TestRunner.java:648)
    at org.testng.TestRunner.run(TestRunner.java:505)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:455)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:450)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:415)
    at org.testng.SuiteRunner.run(SuiteRunner.java:364)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:84)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1187)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1116)
    at org.testng.TestNG.runSuites(TestNG.java:1028)
    at org.testng.TestNG.run(TestNG.java:996)
    at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:236)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:81)

1 个答案:

答案 0 :(得分：0)

错误说明了一切：

org.openqa.selenium.WebDriverException: unknown error: Cannot read property 'offset' of null

在new AShot().takeScreenshot(driver,portal);

之前，您的执行情况似乎没有达到

您的主要问题是您使用的二进制文件中的版本兼容性，如下所示：

  • 您正在使用 java.version: '1.8.0_77'
  • 您正在使用 chromedriver=2.34.522932
  • 您正在使用 chrome=63.0.3239.132
  • 但您使用 Selenium v2.52.0 的 '2016-02-11 19:06:42'

解决方案

  • 将JDK升级到最近的级别 Version 8 Update 151 。
  • 将ChromeDriver保持在 ChromeDriver v2.34 级别。
  • 将Chrome保持在 Chrome v63.x 级别。
  • 将Selenium升级到当前级别 Version 3.8.1 。
  • 执行Test。

有关错误 sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 的详细讨论，您可以看到Discussion

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