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// Copyright © 2010-2016 The CefSharp Authors. All rights reserved.

//

// 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.Drawing;

using System.IO;

using System.Linq;

using System.Threading.Tasks;

using CefSharp.Example;

using CefSharp.Example.Handlers;

using CefSharp.Internals;

namespace CefSharp.OffScreen.Example

{

public class Program

{

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

public static void Main(string[] args)

{

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

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

Console.WriteLine();

// You need to replace this with your own call to Cef.Initialize();

CefExample.Init(true, multiThreadedMessageLoop:true, browserProcessHandler: new BrowserProcessHandler());

MainAsync("cachePath1", 1.0);

//Demo showing Zoom Level of 3.0

//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

//MainAsync("cachePath2", 3.0);

// We have to wait for something, otherwise the process will exit too soon.

Console.ReadKey();

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

// you will get a crash when closing.

Cef.Shutdown();

}

private static async void MainAsync(string cachePath, double zoomLevel)

{

var browserSettings = new BrowserSettings();

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

browserSettings.WindowlessFrameRate = 1;

var requestContextSettings = new RequestContextSettings { CachePath = 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(TestUrl, browserSettings, requestContext))

{

if (zoomLevel > 1)

{

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

{

var b = (ChromiumWebBrowser)s;

if (argsi.Frame.IsMain)

{

b.SetZoomLevel(zoomLevel);

}

};

}

await LoadPageAsync(browser);

//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

await browser.EvaluateScriptAsync("document.getElementById('lst-ib').value = 'CefSharp Was Here!'");

// 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

await browser.ScreenshotAsync(true).ContinueWith(DisplayBitmap);

await LoadPageAsync(browser, "http://github.com");

//Gets a wrapper around the underlying CefBrowser instance

var cefBrowser = browser.GetBrowser();

// Gets a warpper around the CefBrowserHost instance

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

var cefHost = cefBrowser.GetHost();

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

cefHost.Invalidate(PaintElementType.View);

// Wait for the screenshot to be taken.

await browser.ScreenshotAsync(true).ContinueWith(DisplayBitmap);

}

}

public static Task LoadPageAsync(IWebBrowser browser, string address = null)

{

//If using .Net 4.6 then use TaskCreationOptions.RunContinuationsAsynchronously

//and switch to tcs.TrySetResult below - no need for the custom extension method

var tcs = new TaskCompletionSource<bool>();

EventHandler<LoadingStateChangedEventArgs> handler = null;

handler = (sender, args) =>

{

//Wait for while page to finish loading not just the first frame

if (!args.IsLoading)

{

browser.LoadingStateChanged -= handler;

//This is required when using a standard TaskCompletionSource

//Extension method found in the CefSharp.Internals namespace

tcs.TrySetResultAsync(true);

}

};

browser.LoadingStateChanged += handler;

if (!string.IsNullOrEmpty(address))

{

browser.Load(address);

}

return tcs.Task;

}

private static void DisplayBitmap(Task<Bitmap> task)

{

// 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);

var bitmap = task.Result;

// Save the Bitmap to the path.

// The image type is auto-detected via the ".png" extension.

bitmap.Save(screenshotPath);

// We no longer need the Bitmap.

// Dispose it to avoid keeping the memory alive. Especially important in 32-bit applications.

bitmap.Dispose();

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

// Tell Windows to launch the saved image.

Process.Start(screenshotPath);

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

}

}

}