Dotnet/CefSharp.MinimalExample
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Update OffScreen example to evaluate some javascript before taking the screenshot.

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Still need to investigate a better method of waiting for render to complete as Thread.Sleep is crude

Conflicts:
	CefSharp.MinimalExample.OffScreen/Program.cs
This commit is contained in:
amaitland 2015-09-10 14:59:50 +10:00
parent 36a9a38008
commit db4db05662
1 changed files with 32 additions and 22 deletions
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54
CefSharp.MinimalExample.OffScreen/Program.cs
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@ -5,6 +5,7 @@
using System; using System;
using System.Diagnostics; using System.Diagnostics;
using System.IO; using System.IO;
using System.Threading;
using CefSharp.OffScreen; using CefSharp.OffScreen;
namespace CefSharp.MinimalExample.OffScreen namespace CefSharp.MinimalExample.OffScreen
@ -28,7 +29,7 @@ namespace CefSharp.MinimalExample.OffScreen
// An event that is fired when the first page is finished loading. // An event that is fired when the first page is finished loading.
// This returns to us from another thread. // This returns to us from another thread.
browser.FrameLoadEnd += BrowserFrameLoadEnd; browser.LoadingStateChanged += BrowserLoadingStateChanged;
// We have to wait for something, otherwise the process will exit too soon. // We have to wait for something, otherwise the process will exit too soon.
Console.ReadKey(); Console.ReadKey();
@ -38,39 +39,48 @@ namespace CefSharp.MinimalExample.OffScreen
Cef.Shutdown(); Cef.Shutdown();
} }
private static void BrowserFrameLoadEnd(object sender, FrameLoadEndEventArgs e) private static void BrowserLoadingStateChanged(object sender, LoadingStateChangedEventArgs e)
{ {
// Check to ensure it is the main frame which has finished loading // Check to see if loading is complete - this event is called twice, one when loading starts
// second time when it's finished
// (rather than an iframe within the main frame). // (rather than an iframe within the main frame).
if (e.Frame.IsMain) if (!e.IsLoading)
{ {
// Remove the load event handler, because we only want one snapshot of the initial page. // Remove the load event handler, because we only want one snapshot of the initial page.
browser.FrameLoadEnd -= BrowserFrameLoadEnd; browser.LoadingStateChanged -= BrowserLoadingStateChanged;
// Wait for the screenshot to be taken. var scriptTask = browser.EvaluateScriptAsync("document.getElementById('lst-ib').value = 'CefSharp Was Here!'");
var task = browser.ScreenshotAsync();
task.Wait();
// Make a file to save it to (e.g. C:\Users\jan\Desktop\CefSharp screenshot.png) scriptTask.ContinueWith(t =>
var screenshotPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "CefSharp screenshot.png"); {
//Give the browser a little time to render
Thread.Sleep(500);
// Wait for the screenshot to be taken.
var task = browser.ScreenshotAsync();
task.ContinueWith(x =>
{
// 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.png");
Console.WriteLine(); Console.WriteLine();
Console.WriteLine("Screenshot ready. Saving to {0}", screenshotPath); Console.WriteLine("Screenshot ready. Saving to {0}", screenshotPath);
// Save the Bitmap to the path. // Save the Bitmap to the path.
// The image type is auto-detected via the ".png" extension. // The image type is auto-detected via the ".png" extension.
task.Result.Save(screenshotPath); task.Result.Save(screenshotPath);
// We no longer need the Bitmap. // We no longer need the Bitmap.
// Dispose it to avoid keeping the memory alive. Especially important in 32-bit applications. // Dispose it to avoid keeping the memory alive. Especially important in 32-bit applications.
task.Result.Dispose(); task.Result.Dispose();
Console.WriteLine("Screenshot saved. Launching your default image viewer..."); Console.WriteLine("Screenshot saved. Launching your default image viewer...");
// Tell Windows to launch the saved image. // Tell Windows to launch the saved image.
Process.Start(screenshotPath); Process.Start(screenshotPath);
Console.WriteLine("Image viewer launched. Press any key to exit."); Console.WriteLine("Image viewer launched. Press any key to exit.");
});
});
} }
} }
} }