CefSharp/CefSharp.OffScreen.Example/Program.cs at master · cefsharp/CefSharp · GitHub

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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.

using System;

using System.Diagnostics;

using System.IO;

using System.Threading.Tasks;

using CefSharp.DevTools.Page;

namespace CefSharp.OffScreen.Example

{

public class Program

{

private const string TestUrlOne = "https://www.google.com/";

private const string TestUrlTwo = "https://github.com/";

private const string TestUrlThree = "https://www.google.com/doodles";

private const string TestUrlFour = "https://microsoft.com/";

public static int Main(string[] args)

{

Console.WriteLine("This example application will load {0}, take a screenshot, and save it to your desktop.", TestUrlOne);

Console.WriteLine("You may see a lot of Chromium debugging output, please wait...");

Console.WriteLine();

//Console app doesn't have a message loop which we need as Cef.Initialize/Cef.Shutdown must be called on the same

//thread. We use a super simple SynchronizationContext implementation from

//https://devblogs.microsoft.com/pfxteam/await-synchronizationcontext-and-console-apps/

//Continuations will happen on the main thread

//The Nito.AsyncEx.Context Nuget package has a more advanced implementation

//https://github.com/StephenCleary/AsyncEx/blob/8a73d0467d40ca41f9f9cf827c7a35702243abb8/doc/AsyncContext.md#console-example-using-asynccontext

AsyncContext.Run(async delegate

{

Cef.EnableWaitForBrowsersToClose();

var settings = new CefSettings();

//The location where cache data will be stored on disk. If empty an in-memory cache will be used for some features and a temporary disk cache for others.

//HTML5 databases such as localStorage will only persist across sessions if a cache path is specified.

settings.CachePath = Path.GetFullPath("cache");

var success = await Cef.InitializeAsync(settings);

if (!success)

{

return;

}

var t1 = MainAsync(TestUrlOne, TestUrlTwo, "cache\\path1", 1.0);

//Demo showing Zoom Level of 2.0

//Using seperate request contexts allows the urls from the same domain to have independent zoom levels

//otherwise they would be the same - default behaviour of Chromium

var t2 = MainAsync(TestUrlThree, TestUrlFour, "cache\\path2", 2.0);

await Task.WhenAll(t1, t2);

Console.WriteLine("Image viewer launched. Press any key to exit.");

// Wait for user input

Console.ReadKey();

//Wait until the browser has finished closing (which by default happens on a different thread).

//Cef.EnableWaitForBrowsersToClose(); must be called before Cef.Initialize to enable this feature

//See https://github.com/cefsharp/CefSharp/issues/3047 for details

Cef.WaitForBrowsersToClose();

// Clean up Chromium objects. You need to call this in your application otherwise

// you will get a crash when closing.

Cef.Shutdown();

});

//Success

return 0;

}

private static async Task MainAsync(string url, string secondUrl, string cachePath, double zoomLevel)

{

var browserSettings = new BrowserSettings

{

//Reduce rendering speed to one frame per second so it's easier to take screen shots

WindowlessFrameRate = 1

};

var requestContextSettings = new RequestContextSettings

{

CachePath = Path.GetFullPath(cachePath)

};

// RequestContext can be shared between browser instances and allows for custom settings

// e.g. CachePath

using (var requestContext = new RequestContext(requestContextSettings))

using (var browser = new ChromiumWebBrowser(url, browserSettings, requestContext))

{

if (zoomLevel > 1)

{

browser.FrameLoadStart += (s, argsi) =>

{

var b = (ChromiumWebBrowser)s;

if (argsi.Frame.IsMain)

{

b.SetZoomLevel(zoomLevel);

}

};

}

await browser.WaitForInitialLoadAsync();

//Check preferences on the CEF UI Thread

await Cef.UIThreadTaskFactory.StartNew(delegate

{

var preferences = requestContext.GetAllPreferences(true);

//Check do not track status

var doNotTrack = (bool)preferences["enable_do_not_track"];

Debug.WriteLine("DoNotTrack: " + doNotTrack);

});

var onUi = Cef.CurrentlyOnThread(CefThreadIds.TID_UI);

// For Google.com pre-pupulate the search text box

if (url.Contains("google.com"))

{

await browser.EvaluateScriptAsync("document.querySelector('[name=q]').value = 'CefSharp Was Here!'");

}

//Example using SendKeyEvent for input instead of javascript

//var browserHost = browser.GetBrowserHost();

//var inputString = "CefSharp Was Here!";

//foreach(var c in inputString)

//{

// browserHost.SendKeyEvent(new KeyEvent { WindowsKeyCode = c, Type = KeyEventType.Char });

//}

////Give the browser a little time to finish drawing our SendKeyEvent input

//await Task.Delay(100);

var contentSize = await browser.GetContentSizeAsync();

var viewport = new Viewport

{

Height = contentSize.Height,

Width = contentSize.Width,

Scale = 1.0

};

// Wait for the screenshot to be taken,

// if one exists ignore it, wait for a new one to make sure we have the most up to date

var bitmap = await browser.CaptureScreenshotAsync(viewport:viewport);

// Make a file to save it to (e.g. C:\Users\jan\Desktop\CefSharp screenshot.png)

var screenshotPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "CefSharp screenshot" + DateTime.Now.Ticks + ".png");

Console.WriteLine();

Console.WriteLine("Screenshot ready. Saving to {0}", screenshotPath);

File.WriteAllBytes(screenshotPath, bitmap);

Console.WriteLine("Screenshot saved. Launching your default image viewer...");

// Tell Windows to launch the saved image.

Process.Start(new ProcessStartInfo(screenshotPath)

{

// UseShellExecute is false by default on .NET Core.

UseShellExecute = true

});

await browser.LoadUrlAsync(secondUrl);

// Gets a warpper around the CefBrowserHost instance

// You can perform a lot of low level browser operations using this interface

var cefbrowserHost = browser.GetBrowserHost();

//You can call Invalidate to redraw/refresh the image

cefbrowserHost.Invalidate(PaintElementType.View);

contentSize = await browser.GetContentSizeAsync();

viewport = new Viewport

{

Height = contentSize.Height,

Width = contentSize.Width,

Scale = 1.0

};

// Wait for the screenshot to be taken,

// if one exists ignore it, wait for a new one to make sure we have the most up to date

bitmap = await browser.CaptureScreenshotAsync(viewport: viewport);

screenshotPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "CefSharp screenshot" + DateTime.Now.Ticks + ".png");

Console.WriteLine();

Console.WriteLine("Screenshot ready. Saving to {0}", screenshotPath);

File.WriteAllBytes(screenshotPath, bitmap);

Console.WriteLine("Screenshot saved. Launching your default image viewer...");

// Tell Windows to launch the saved image.

Process.Start(new ProcessStartInfo(screenshotPath)

{

// UseShellExecute is false by default on .NET Core.

UseShellExecute = true

});

}

CefSharp/CefSharp.OffScreen.Example/Program.cs at master · cefsharp/CefSharp · GitHub

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CefSharp/CefSharp.OffScreen.Example/Program.cs at master · cefsharp/CefSharp · GitHub

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