Winform将网页生成图片

今天无意见看到浏览器有将网页生成图片的功能，顿时赶脚很好奇，于是就找了找资料自己做了一个类似的功能。

工具截图：生成后的图片

手动填写网站地址，可选择图片类型和保持图片地址，来生成页面的图片，当图片路径未选择时则保存桌面；

具体代码如下：

将html生成图片的类

 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, );
             MyControl.Url = UrlString;
             while (MyControl.ReadyState != WebBrowserReadyState.Complete)
             {
                 Application.DoEvents();
             }
             MyControl.Height = MyControl.Document.Body.ScrollRectangle.Height + ;
             MyControl.Url = UrlString;
             WebControlImage.Snapshot snap = new WebControlImage.Snapshot();
             Bitmap MyImage = snap.TakeSnapshot(MyControl.ActiveXInstance, new Rectangle(, , MyControl.Width, MyControl.Height));
             MyControl.Dispose();
             return MyImage;
         }
         ///
         /// WebBrowser获取图形
         ///
         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
             {
                 ///
                 /// ?煺?
                 ///
                 /// Com 对象
                 /// 图象大小
                 ///
                 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,
                         -,
                         IntPtr.Zero,
                         null,
                         IntPtr.Zero,
                         hDrawDC.GetHdc(),
                         new NativeMethods.COMRECT(bmpRect),
                         null,
                         IntPtr.Zero,
                         );
                     }
                     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);
                 }
             }
         }
     }
 }

winfrom后台处理方面代码如下

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;
 using System.Drawing.Imaging;

 namespace Excel文件处理
 {
     public partial class Html : Form
     {
         public Html()
         {
             InitializeComponent();
         }
         private string ImageUrl = "";//图片地址
         private string ImageName = "";//图片名称
         private void button1_Click(object sender, EventArgs e)
         {
             string HtmlUrl = this.Txt_Url.Text.Trim();
             if (HtmlUrl=="")
             {
                 MessageBox.Show("请输入网址");
                 return;
             }
             if (ImageUrl.Trim()=="")
             {
                 ImageUrl = @"C:\Users\Administrator\Desktop";
             }
             try
             {
                 Uri ri = new Uri(this.Txt_Url.Text);
                 Bitmap bit = Print.Test.GetHtmlImage(ri, );
                 ImageName = this.Txt_Name.Text.Trim();//图片名称
                 if (ImageName != "")
                 {
                     if (ImageName.IndexOf('.') != -)
                     {//当用户输入图片后缀时，将后缀截取
                         ImageName.Substring(, ImageName.LastIndexOf('.'));
                     }
                 }
                 else
                     ImageName = DateTime.Now.Ticks.ToString();//时间名称
                 switch (this.comboBox1.SelectedText)
                 {
                     case "GIF": ImageUrl += "\\" + ImageName + ".gif"; break;
                     case "JPG": ImageUrl += "\\" + ImageName + ".jpg"; break;
                     case "PNG": ImageUrl += "\\" + ImageName + ".png"; break;
                     default: ImageUrl += "\\" + ImageName + ".png"; break;
                 }

                 switch (this.comboBox1.SelectedText)
                 {
                     case "GIF": bit.Save(ImageUrl, ImageFormat.Gif); break;
                     case "JPG": bit.Save(ImageUrl, ImageFormat.Jpeg); break;
                     case "PNG": bit.Save(ImageUrl, ImageFormat.Png); break;
                     default: bit.Save(ImageUrl, ImageFormat.Png); break;
                 }

                 bit = null;
                 ImageUrl = "";//图片地址
                 ImageName = "";//图片名称
                 MessageBox.Show("生产成功");
             }
             catch
             {
                 MessageBox.Show("网址输入有误！");
                 return;
             }

         }

         private void button2_Click(object sender, EventArgs e)
         {
             //获取保存路径
             if (this.folderBrowserDialog1.ShowDialog()==DialogResult.OK)
             {
                 if (this.folderBrowserDialog1.SelectedPath.Trim()!="")
                 {
                     ImageUrl = folderBrowserDialog1.SelectedPath;
                     this.label6.Text = ImageUrl;
                 }
             }

         }
     }
 }