C# Webbrowser截屏 禁止弹出窗口及脚本错误提示 截取flash 视频

首先引入两个dll文件 Microsoft.mshtml.dll和SHDocVw.dll

大概路径为

C:\Program Files\Microsoft Visual Studio 10.0\Visual Studio Tools for Office\PIA\Common\Microsoft.mshtml.dll

C:\Windows\System32\SHDocVw.dll

下面的代码只是在页面加载完成之后进行的截图，这种截图方法不能截取falsh，视频等，会出现空白的情况，而且如果你只截取一次倒无妨，如果想要每间隔几秒截取1张，你会发现截取的图片完全一样。本代码为我的测试性代码，为省事写的比较简单

示例代码为：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.IO;
using System.ServiceProcess;
using System.Net;
using System.Windows.Forms;
using System.Drawing;
using mshtml;
namespace ConsoleApplication1
{

class ShareDeleteTest
{
static WebBrowser _webBrowser;
static void Main()
{
Thread thread = new Thread(GenerateImage);
thread.SetApartmentState(ApartmentState.STA);
thread.Start();
Thread.Sleep(20000);
}
public static void GenerateImage()
{
_webBrowser = new WebBrowser();
try
{
_webBrowser.ScrollBarsEnabled = true;
_webBrowser.ScriptErrorsSuppressed = false;
_webBrowser.IsWebBrowserContextMenuEnabled = false;
_webBrowser.ClientSize = new Size(1000, 750);
_webBrowser.Navigate(@"http://www.sina.com.cn/");
_webBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(_webBrowser_DocumentCompleted);
(_webBrowser.ActiveXInstance as SHDocVw.WebBrowser).NavigateComplete2 += new SHDocVw.DWebBrowserEvents2_NavigateComplete2EventHandler(ShareDeleteTest_NavigateComplete2);
(_webBrowser.ActiveXInstance as SHDocVw.WebBrowser).Silent = true;
while (_webBrowser.ReadyState != WebBrowserReadyState.Complete)
Application.DoEvents();

}
catch (Exception ex)
{

}
finally
{
_webBrowser.Dispose();
}
}

static void ShareDeleteTest_NavigateComplete2(object pDisp, ref object URL)
{

mshtml.IHTMLDocument2 doc = (_webBrowser.ActiveXInstance as SHDocVw.WebBrowser).Document as mshtml.IHTMLDocument2;
doc.parentWindow.execScript("window.alert=null", "javascript");
doc.parentWindow.execScript("window.confirm=null", "javascript");
doc.parentWindow.execScript("window.open=null", "javascript");
//doc.parentWindow.execScript("window.showModalDialog=null", "javascript");
doc.parentWindow.execScript("window.close=null", "javascript");
}

static void _webBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
WebBrowser webBrowser = (WebBrowser)sender;
if (webBrowser.ReadyState != WebBrowserReadyState.Complete)
return;
Console.WriteLine("Height:" + _webBrowser.Height);
Console.WriteLine("Width:" + _webBrowser.Width);

HtmlDocument document = _webBrowser.Document;
//HtmlElement body = document.Body;
//Rectangle rect = body.ScrollRectangle;
//body.ScrollLeft = webBrowser.Bounds.Width;

document.Window.ScrollTo(0, 0);
string filename = DateTime.Now.ToString("yyyyMMddHHmmss")+".jpg";
Bitmap _pictureBitmap = new Bitmap(webBrowser.Bounds.Width, webBrowser.Bounds.Height);
webBrowser.ScrollBarsEnabled = false;
webBrowser.DrawToBitmap(_pictureBitmap, webBrowser.Bounds);

System.Drawing.Graphics graphic = System.Drawing.Graphics.FromImage(_pictureBitmap);
System.Drawing.Font font = new System.Drawing.Font("Calibri", 12.0f, System.Drawing.FontStyle.Regular);
//将水印加在位图上
graphic.DrawString(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), font, System.Drawing.Brushes.Red, new System.Drawing.PointF());
_pictureBitmap.Save(@"G:\Picture\" + filename);
graphic.Dispose();
_pictureBitmap.Dispose();
}

}

你可以使用下面这个继承自WebBrowser的类来截图，
class EWebBrowser : System.Windows.Forms.WebBrowser
{
SHDocVw.IWebBrowser2 Iwb2;

protected override void AttachInterfaces(object nativeActiveXObject)
{
Iwb2 = (SHDocVw.IWebBrowser2)nativeActiveXObject;
Iwb2.Silent = true;
base.AttachInterfaces(nativeActiveXObject);
}

protected override void DetachInterfaces()
{
Iwb2 = null;
base.DetachInterfaces();
}
}

}

下面的代码转为解决上面所提出的问题，此方法更好点，可以截取动态的视频falsh等。

示例代码如下：

using System;

using System.Threading;

//using ITV.ScreenShot;

using System.Windows.Forms;

using System.Drawing;

using System.Runtime.InteropServices;

namespace ConsoleApplication1

{

class ShareDeleteTest

{

static WebBrowser _webBrowser;

static Action deleteScreenShot;

static void Main()

{

Service1 s = new Service1();

s.StartTest();

return;

deleteScreenShot = ScreenShot;

Thread thread = new Thread(GenerateImage);

thread.SetApartmentState(ApartmentState.STA);

thread.Start();

Console.Read();

}

public static void ShreadFun()

{

for (int i = 0; i < 5; i++)

{

_webBrowser.Invoke(deleteScreenShot);

Thread.Sleep(5000);

}

}

public static void ScreenShot()

{

HtmlDocument document = _webBrowser.Document;

document.Window.ScrollTo(0, 200);

_webBrowser.ScrollBarsEnabled = false;

string filename = DateTime.Now.ToString("yyyyMMddHHmmss") + ".jpg";

Bitmap _pictureBitmap = new Bitmap(_webBrowser.Bounds.Width, _webBrowser.Bounds.Height);

_webBrowser.DrawToBitmap(_pictureBitmap, _webBrowser.Bounds);

Graphics graphic = Graphics.FromImage(_pictureBitmap);

Font font = new Font("Calibri", 12.0f, System.Drawing.FontStyle.Regular);

graphic.DrawString(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), font, System.Drawing.Brushes.Red, new System.Drawing.PointF());//将时间水印加在位图上

_pictureBitmap.Save(@"G:\Picture\" + filename);

graphic.Dispose();

_pictureBitmap.Dispose();

}

public static void GenerateImage()

{

_webBrowser = new WebBrowser();

try

{

_webBrowser.ScrollBarsEnabled = true;

_webBrowser.ScriptErrorsSuppressed = false;

_webBrowser.IsWebBrowserContextMenuEnabled = false;

_webBrowser.ClientSize = new Size(1000, 750);

_webBrowser.Navigate(@"http://www.itv.cn");

_webBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(_webBrowser_DocumentCompleted);

(_webBrowser.ActiveXInstance as SHDocVw.WebBrowser).NavigateComplete2 += new SHDocVw.DWebBrowserEvents2_NavigateComplete2EventHandler(ShareDeleteTest_NavigateComplete2);

(_webBrowser.ActiveXInstance as SHDocVw.WebBrowser).Silent = true;

while (true)

Application.DoEvents();

}

catch (Exception ex)

{

Console.WriteLine(ex.Message);

}

finally

{

//_webBrowser.Dispose();

}

}

static void ShareDeleteTest_NavigateComplete2(object pDisp, ref object URL)

{

mshtml.IHTMLDocument2 doc = (_webBrowser.ActiveXInstance as SHDocVw.WebBrowser).Document as mshtml.IHTMLDocument2;

doc.parentWindow.execScript("window.alert=null", "javascript");

doc.parentWindow.execScript("window.confirm=null", "javascript");

doc.parentWindow.execScript("window.open=null", "javascript");

//doc.parentWindow.execScript("window.showModalDialog=null", "javascript");

doc.parentWindow.execScript("window.close=null", "javascript");

}

static void _webBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)

{

if (_webBrowser.ReadyState == WebBrowserReadyState.Complete)

{

Thread shot = new Thread(ShreadFun);

shot.Start();

}

}

}

}