RemoteWebDriver does not support taking screenshots

[Graham Abell]

Hi All,

I'm getting an error while trying to validate a page via RemoteWebDriver. It's indicating that RemoteWebDriver does not support taking screenshots which I don't think is the case since I screenshot with it all the time in other contexts:

public static File screenshot() {
   WebDriver augmentedDriver = new Augmenter().augment(remoteWebDriver));
   return ((TakesScreenshot) augmentedDriver).getScreenshotAs(OutputType.FILE);
}

Exception: 

java.lang.UnsupportedOperationException: org.openqa.selenium.remote.RemoteWebDriver does not support taking screenshots.

at com.googlecode.fightinglayoutbugs.ScreenshotCache.takeScreenshot(ScreenshotCache.java:251)

at com.googlecode.fightinglayoutbugs.ScreenshotCache.takeScreenshot(ScreenshotCache.java:163)

at com.googlecode.fightinglayoutbugs.ScreenshotCache.getScreenshot(ScreenshotCache.java:77)

at com.googlecode.fightinglayoutbugs.ScreenshotCache.takeScreenshot(ScreenshotCache.java:144)

at com.googlecode.fightinglayoutbugs.WebPage.takeScreenshot(WebPage.java:162)

at com.googlecode.fightinglayoutbugs.AnimationAwareTextDetector.detectTextPixelsIn(AnimationAwareTextDetector.java:78)

at com.googlecode.fightinglayoutbugs.WebPage.getTextPixels(WebPage.java:176)

at com.googlecode.fightinglayoutbugs.DetectTextNearOrOverlappingHorizontalEdge.findLayoutBugsIn(DetectTextNearOrOverlappingHorizontalEdge.java:37)

at com.googlecode.fightinglayoutbugs.FightingLayoutBugs.findLayoutBugsIn(FightingLayoutBugs.java:146)

at com.paddypower.selenium.framework.PageValidation.checkLayoutBugs(PageValidation.java:46)

thanks,

Graham

[Michael Tamm]

I guess you passed the RemoteWebDriver instance directly to the WebPage constructor.

Currently you must construct the WebPage with the augmented driver instead.

Kind regards, Michael

P.S. I guess I will add some code now,
so that FLB will do the new Augmenter().augment(...) magic itself in the future ...

2012/7/18 Graham Abell <niceg...@gmail.com>

[Andrey Zamovskiy]

getScreenshotAs method is actually missing in RemoteWebDriver class.
I think it's a bug in selenium, because i've found no reason why it
can't be used and implemented it for my needs.
But forgot to submit a patch.
As fastest solution you can extend RemoteWebDriver class, like this:

import org.openqa.selenium.Platform;
import org.openqa.selenium.remote.*;
import org.openqa.selenium.OutputType;
import org.openqa.selenium.TakesScreenshot

public class ExtendedRemoteWebDriver extends RemoteWebDriver
implements TakesScreenshot
{
public <X> X getScreenshotAs(OutputType<X> target) {
// Get the screenshot as base64.
String base64 = execute(DriverCommand.SCREENSHOT).getValue().toString();
// ... and convert it.
return target.convertFromBase64Png(base64);

--
Andrey