WINFOM把一个网页保存成图片代码,CSharp代码库,德仔网

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【CSharp】 WINFOM把一个网页保存成图片
作者:zgke / 发布于2014/7/29/ 372

	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);
	 }
	 }
	 }
	 }
	}
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