http://blog.csdn.net/zgke/article/details/3248497
使用
- Bitmap MyImage = Test.GetControlScrollImage(new Uri(@"http://www.sina.com.cn"), 1024);
- MyImage.Save(@"C:/1.BMP");
- MyImage.Dispose();
使用到的类
- using System;
- using System.Collections.Generic;
- using System.ComponentModel;
- using System.Data;
- using System.Drawing;
- using System.Text;
- using System.Windows.Forms;
- using System.Drawing.Imaging;
- using System.Runtime.InteropServices;
- using System.Security;
- namespace Print
- {
- public class Test
- {
- public static Bitmap GetHtmlImage(Uri UrlString,int Width)
- {
- WebBrowser MyControl = new WebBrowser();
- MyControl.Size = new Size(Width, 10);
- MyControl.Url = UrlString;
- while (MyControl.ReadyState != WebBrowserReadyState.Complete)
- {
- Application.DoEvents();
- }
- MyControl.Height= MyControl.Document.Body.ScrollRectangle.Height+20;
- MyControl.Url = UrlString;
- WebControlImage.Snapshot snap = new WebControlImage.Snapshot();
- Bitmap MyImage= snap.TakeSnapshot(MyControl.ActiveXInstance, new Rectangle(0, 0, MyControl.Width, MyControl.Height));
- MyControl.Dispose();
- return MyImage;
- }
- /// <summary>
- /// WebBrowser获取图形
- /// </summary>
- private class WebControlImage
- {
- internal static class NativeMethods
- {
- [StructLayout(LayoutKind.Sequential)]
- public sealed class tagDVTARGETDEVICE
- {
- [MarshalAs(UnmanagedType.U4)]
- public int tdSize;
- [MarshalAs(UnmanagedType.U2)]
- public short tdDriverNameOffset;
- [MarshalAs(UnmanagedType.U2)]
- public short tdDeviceNameOffset;
- [MarshalAs(UnmanagedType.U2)]
- public short tdPortNameOffset;
- [MarshalAs(UnmanagedType.U2)]
- public short tdExtDevmodeOffset;
- }
- [StructLayout(LayoutKind.Sequential)]
- public class COMRECT
- {
- public int left;
- public int top;
- public int right;
- public int bottom;
- public COMRECT()
- {
- }
- public COMRECT(Rectangle r)
- {
- this.left = r.X;
- this.top = r.Y;
- this.right = r.Right;
- this.bottom = r.Bottom;
- }
- public COMRECT(int left, int top, int right, int bottom)
- {
- this.left = left;
- this.top = top;
- this.right = right;
- this.bottom = bottom;
- }
- public static NativeMethods.COMRECT FromXYWH(int x, int y, int width, int height)
- {
- return new NativeMethods.COMRECT(x, y, x + width, y + height);
- }
- public override string ToString()
- {
- return string.Concat(new object[] { "Left = ", this.left, " Top ", this.top, " Right = ", this.right, " Bottom = ", this.bottom });
- }
- }
- [StructLayout(LayoutKind.Sequential)]
- public sealed class tagLOGPALETTE
- {
- [MarshalAs(UnmanagedType.U2)]
- public short palVersion;
- [MarshalAs(UnmanagedType.U2)]
- public short palNumEntries;
- }
- }
- public class Snapshot
- {
- /// <summary>
- /// 取快照
- /// </summary>
- /// <param name="pUnknown">Com 对象</param>
- /// <param name="bmpRect">图象大小</param>
- /// <returns></returns>
- public Bitmap TakeSnapshot(object pUnknown, Rectangle bmpRect)
- {
- if (pUnknown == null)
- return null;
- //必须为com对象
- if (!Marshal.IsComObject(pUnknown))
- return null;
- //IViewObject 接口
- UnsafeNativeMethods.IViewObject ViewObject = null;
- IntPtr pViewObject = IntPtr.Zero;
- //内存图
- Bitmap pPicture = new Bitmap(bmpRect.Width, bmpRect.Height);
- Graphics hDrawDC = Graphics.FromImage(pPicture);
- //获取接口
- object hret = Marshal.QueryInterface(Marshal.GetIUnknownForObject(pUnknown),
- ref UnsafeNativeMethods.IID_IViewObject, out pViewObject);
- try
- {
- ViewObject = Marshal.GetTypedObjectForIUnknown(pViewObject, typeof(UnsafeNativeMethods.IViewObject)) as UnsafeNativeMethods.IViewObject;
- //调用Draw方法
- ViewObject.Draw((int)System.Runtime.InteropServices.ComTypes.DVASPECT.DVASPECT_CONTENT,
- -1,
- IntPtr.Zero,
- null,
- IntPtr.Zero,
- hDrawDC.GetHdc(),
- new NativeMethods.COMRECT(bmpRect),
- null,
- IntPtr.Zero,
- 0);
- }
- catch (Exception ex)
- {
- Console.WriteLine(ex.Message);
- throw ex;
- }
- //释放
- hDrawDC.Dispose();
- return pPicture;
- }
- }
- [SuppressUnmanagedCodeSecurity]
- internal static class UnsafeNativeMethods
- {
- public static Guid IID_IViewObject = new Guid("{0000010d-0000-0000-C000-000000000046}");
- [ComImport, Guid("0000010d-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
- public interface IViewObject
- {
- [PreserveSig]
- int Draw([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, int lindex, IntPtr pvAspect, [In] NativeMethods.tagDVTARGETDEVICE ptd, IntPtr hdcTargetDev, IntPtr hdcDraw, [In] NativeMethods.COMRECT lprcBounds, [In] NativeMethods.COMRECT lprcWBounds, IntPtr pfnContinue, [In] int dwContinue);
- [PreserveSig]
- int GetColorSet([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, int lindex, IntPtr pvAspect, [In] NativeMethods.tagDVTARGETDEVICE ptd, IntPtr hicTargetDev, [Out] NativeMethods.tagLOGPALETTE ppColorSet);
- [PreserveSig]
- int Freeze([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, int lindex, IntPtr pvAspect, [Out] IntPtr pdwFreeze);
- [PreserveSig]
- int Unfreeze([In, MarshalAs(UnmanagedType.U4)] int dwFreeze);
- void SetAdvise([In, MarshalAs(UnmanagedType.U4)] int aspects, [In, MarshalAs(UnmanagedType.U4)] int advf, [In, MarshalAs(UnmanagedType.Interface)] System.Runtime.InteropServices.ComTypes.IAdviseSink pAdvSink);
- void GetAdvise([In, Out, MarshalAs(UnmanagedType.LPArray)] int[] paspects, [In, Out, MarshalAs(UnmanagedType.LPArray)] int[] advf, [In, Out, MarshalAs(UnmanagedType.LPArray)] System.Runtime.InteropServices.ComTypes.IAdviseSink[] pAdvSink);
- }
- }
- }
- }
- }