截取网页截图的最佳方式

Question

截取网页截图的最佳方法是什么？目前我刚刚开始使用firefox的selenium实例并使用winapi将其带到前面并制作屏幕截图.我 已经问过类似的问题了.

有两点:

• 缓慢.
• 如果任何窗口出现高于我们的Web浏览器窗口,此窗口将在我们的屏幕截图中显示.

是否有任何方法可以更加"编程"截屏？

这是我现在使用的一些代码:

class FirefoxDriverEx : FirefoxDriver
{
    public Process GetFirefoxProcess()
    {
        var fi = typeof(FirefoxBinary).GetField("process", BindingFlags.NonPublic | BindingFlags.Instance);
        return fi.GetValue(this.Binary) as Process;
    }
}

以下是说明截屏过程的代码:

using (FirefoxDriverEx driver = new FirefoxDriverEx())
{
    driver.Navigate().GoToUrl(url);

    var process = driver.GetFirefoxProcess();

    if (process != null)
    {
        var screenCapture = new ScreenCapture();
        Win.SetForegroundWindow(process.MainWindowHandle.ToInt32());
    }
}

现在,我正在考虑一些控制窗口队列的管理员来截取屏幕截图.

问题编辑.

我不是在寻找一种解决方案,只需在内存中获取屏幕截图并将其返回到HTTP流.因此,任何保存屏幕截图并将其保存到文件然后从那里获取的方法都非常模糊.

问题编辑#2.

我忘了提.需要的截图应该按照用户的看法进行.因此,截图应该有浏览器窗口和Web浏览器窗口边界内的网站.我找不到任何方法来改变在硒的WebDriver中截取屏幕截图的模式.WebDriver只是在没有任何浏览器窗口的情况下获取页面的屏幕截图.

Answer 1

我推荐getScreenshotAs.它甚至可以在屏幕上显示"视线外"部分.

以下是gr0ovy中的一些示例代码.

import java.io.IOException
import java.net.URL
import java.nio.file.Path
import java.nio.file.Paths
import java.text.SimpleDateFormat

import org.openqa.selenium.Capabilities
import org.openqa.selenium.TakesScreenshot
import org.openqa.selenium.WebDriverException
import org.openqa.selenium.remote.CapabilityType
import org.openqa.selenium.remote.DriverCommand
import org.openqa.selenium.remote.RemoteWebDriver
import org.openqa.selenium.OutputType
import org.openqa.selenium.WebDriver



public class Selenium2Screenshot {
private WebDriver driver
private String browserType
private boolean skipScreenshots

public Selenium2Screenshot(WebDriver webDriver, String browserType, boolean skipScreenshots) {
    this.driver = webDriver
    this.browserType = browserType
    this.skipScreenshots = skipScreenshots
}
public void takeScreenshot(String filenameBase) {
    if (!skipScreenshots) {
        Date today
        String formattedDate
        SimpleDateFormat formatter
        Locale currentLocale
        File scrFile
        currentLocale = new Locale("en", "US")
        formatter = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss_SSS", currentLocale)
        today = new Date()
        formattedDate = formatter.format(today)
        String filename = getUiAutomationDir() + filenameBase + "_" + browserType + formattedDate + ".png"
        Log.logger.info("Screenshot filename = " + filename)

        try {
            scrFile = ((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE)
            JavaIO.copy(scrFile.getAbsolutePath(), filename)
        } catch (Exception e) {
            Log.logger.error(e.message, e)
        }
    } else {
        Log.logger.info("Skipped Screenshot")
    }
}
private String getUiAutomationDir()
{
    String workingDir = System.getProperty("user.dir")
    Path workingDirPath = Paths.get(workingDir)
    String returnString = workingDirPath.toString() + "\\"
    return returnString
}

}

编辑于2012年8月1日:

获取应用处理代码.我肯定会多次复制stackoverflow上的代码,但希望这不是与其他帖子完全相同的代码:-)

public static IntPtr FindWindowByPartialCaption(String partialCaption)
    {
        var desktop = User32.GetDesktopWindow();
        var children = EnumerateWindows.GetChildWindows(desktop);
        foreach (var intPtr in children)
        {
            var current = GetText(intPtr);
            if (current.Contains(partialCaption))
                return intPtr;
        }
        return IntPtr.Zero;
    }

    [DllImport("user32.dll", EntryPoint = "GetDesktopWindow")]
    public static extern IntPtr GetDesktopWindow();

    [DllImport("user32.dll")]
    public static extern bool EnumChildWindows(IntPtr hWndParent, EnumWindowProc lpEnumFunc, IntPtr lParam);

    public delegate bool EnumWindowProc(IntPtr hWnd, IntPtr parameter);
    public static List<IntPtr> GetChildWindows(IntPtr parent)
    {
        return GetChildWindows(parent, false);
    }
    public static List<IntPtr> GetChildWindows(IntPtr parent, bool reverse)
    {
        List<IntPtr> result = new List<IntPtr>();
        GCHandle listHandle = GCHandle.Alloc(result);
        try
        {
            EnumWindowProc childProc = new EnumWindowProc(EnumWindow);
            EnumChildWindows(parent, childProc, GCHandle.ToIntPtr(listHandle));
        }
        finally
        {
            if (listHandle.IsAllocated)
                listHandle.Free();
        }
        if (reverse)
        {
            List<IntPtr> resultList = result.Reverse<IntPtr>().ToList();
            return resultList;
        } 
        else
            return result;
    }

    private static bool EnumWindow(IntPtr handle, IntPtr pointer)
    {
        GCHandle gch = GCHandle.FromIntPtr(pointer);
        List<IntPtr> list = gch.Target as List<IntPtr>;
        if (list == null)
        {
            throw new InvalidCastException("GCHandle Target could not be cast as List<IntPtr>");
        }
        list.Add(handle);
        //  You can modify this to check to see if you want to cancel the operation, then return a null here
        return true;
    }
}

http://www.pinvoke.net/也是一个很好的资源.