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  • 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

      1 using System; 
  2 using System.Collections.Generic; 
  3 using System.ComponentModel; 
  4 using System.Data; 
  5 using System.Drawing; 
  6 using System.Text; 
  7 using System.Windows.Forms; 
  8 using System.Drawing.Imaging; 
  9 using System.Runtime.InteropServices; 
 10 using System.Security;
 11 namespace Print
 12 {
 13     public class Test
 14     {
 15         public static Bitmap GetHtmlImage(Uri UrlString, int Width)
 16         {
 17             WebBrowser MyControl = new WebBrowser();
 18             MyControl.Size = new Size(Width, 10);
 19             MyControl.Url = UrlString;
 20             while (MyControl.ReadyState != WebBrowserReadyState.Complete)
 21             {
 22                 Application.DoEvents();
 23             }
 24             MyControl.Height = MyControl.Document.Body.ScrollRectangle.Height + 20;
 25             MyControl.Url = UrlString;
 26             WebControlImage.Snapshot snap = new WebControlImage.Snapshot();
 27             Bitmap MyImage = snap.TakeSnapshot(MyControl.ActiveXInstance, new Rectangle(0, 0, MyControl.Width, MyControl.Height));
 28             MyControl.Dispose();
 29             return MyImage;
 30         }
 31         /// 
 32         /// WebBrowser获取图形 
 33         /// 
 34         private class WebControlImage
 35         {
 36             internal static class NativeMethods
 37             {
 38                 [StructLayout(LayoutKind.Sequential)]
 39                 public sealed class tagDVTARGETDEVICE
 40                 {
 41                     [MarshalAs(UnmanagedType.U4)]
 42                     public int tdSize;
 43                     [MarshalAs(UnmanagedType.U2)]
 44                     public short tdDriverNameOffset;
 45                     [MarshalAs(UnmanagedType.U2)]
 46                     public short tdDeviceNameOffset;
 47                     [MarshalAs(UnmanagedType.U2)]
 48                     public short tdPortNameOffset;
 49                     [MarshalAs(UnmanagedType.U2)]
 50                     public short tdExtDevmodeOffset;
 51                 }
 52                 [StructLayout(LayoutKind.Sequential)]
 53                 public class COMRECT
 54                 {
 55                     public int left;
 56                     public int top;
 57                     public int right;
 58                     public int bottom;
 59                     public COMRECT()
 60                     {
 61                     }
 62                     public COMRECT(Rectangle r)
 63                     {
 64                         this.left = r.X;
 65                         this.top = r.Y;
 66                         this.right = r.Right;
 67                         this.bottom = r.Bottom;
 68                     }
 69                     public COMRECT(int left, int top, int right, int bottom)
 70                     {
 71                         this.left = left;
 72                         this.top = top;
 73                         this.right = right;
 74                         this.bottom = bottom;
 75                     }
 76                     public static NativeMethods.COMRECT FromXYWH(int x, int y, int width, int height)
 77                     {
 78                         return new NativeMethods.COMRECT(x, y, x + width, y + height);
 79                     }
 80                     public override string ToString()
 81                     {
 82                         return string.Concat(new object[] { "Left = ", this.left, " Top ", this.top, " Right = ", this.right, " Bottom = ", this.bottom });
 83                     }
 84                 }
 85                 [StructLayout(LayoutKind.Sequential)]
 86                 public sealed class tagLOGPALETTE
 87                 {
 88                     [MarshalAs(UnmanagedType.U2)]
 89                     public short palVersion;
 90                     [MarshalAs(UnmanagedType.U2)]
 91                     public short palNumEntries;
 92                 }
 93             }
 94             public class Snapshot
 95             {
 96                 /// 
 97                 /// ?煺? 
 98                 /// 
 99                 /// Com 对象 
100                 /// 图象大小 
101                 /// 
102                 public Bitmap TakeSnapshot(object pUnknown, Rectangle bmpRect)
103                 {
104                     if (pUnknown == null)
105                         return null;
106                     //必须为com对象 
107                     if (!Marshal.IsComObject(pUnknown))
108                         return null;
109                     //IViewObject 接口 
110                     UnsafeNativeMethods.IViewObject ViewObject = null;
111                     IntPtr pViewObject = IntPtr.Zero;
112                     //内存图 
113                     Bitmap pPicture = new Bitmap(bmpRect.Width, bmpRect.Height);
114                     Graphics hDrawDC = Graphics.FromImage(pPicture);
115                     //获取接口 
116                     object hret = Marshal.QueryInterface(Marshal.GetIUnknownForObject(pUnknown),
117                     ref UnsafeNativeMethods.IID_IViewObject, out pViewObject);
118                     try
119                     {
120                         ViewObject = Marshal.GetTypedObjectForIUnknown(pViewObject, typeof(UnsafeNativeMethods.IViewObject)) as UnsafeNativeMethods.IViewObject;
121                         //调用Draw方法 
122                         ViewObject.Draw((int)System.Runtime.InteropServices.ComTypes.DVASPECT.DVASPECT_CONTENT,
123                         -1,
124                         IntPtr.Zero,
125                         null,
126                         IntPtr.Zero,
127                         hDrawDC.GetHdc(),
128                         new NativeMethods.COMRECT(bmpRect),
129                         null,
130                         IntPtr.Zero,
131                         0);
132                     }
133                     catch (Exception ex)
134                     {
135                         Console.WriteLine(ex.Message);
136                         throw ex;
137                     }
138                     //释放 
139                     hDrawDC.Dispose();
140                     return pPicture;
141                 }
142             }
143             [SuppressUnmanagedCodeSecurity]
144             internal static class UnsafeNativeMethods
145             {
146                 public static Guid IID_IViewObject = new Guid("{0000010d-0000-0000-C000-000000000046}");
147                 [ComImport, Guid("0000010d-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
148                 public interface IViewObject
149                 {
150                     [PreserveSig]
151                     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);
152                     [PreserveSig]
153                     int GetColorSet([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, int lindex, IntPtr pvAspect, [In] NativeMethods.tagDVTARGETDEVICE ptd, IntPtr hicTargetDev, [Out] NativeMethods.tagLOGPALETTE ppColorSet);
154                     [PreserveSig]
155                     int Freeze([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, int lindex, IntPtr pvAspect, [Out] IntPtr pdwFreeze);
156                     [PreserveSig]
157                     int Unfreeze([In, MarshalAs(UnmanagedType.U4)] int dwFreeze);
158                     void SetAdvise([In, MarshalAs(UnmanagedType.U4)] int aspects, [In, MarshalAs(UnmanagedType.U4)] int advf, [In, MarshalAs(UnmanagedType.Interface)] System.Runtime.InteropServices.ComTypes.IAdviseSink pAdvSink);
159                     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);
160                 }
161             }
162         }
163     }
164 }
    View Code

    winfrom后台处理方面代码如下

     1 using System;
 2 using System.Collections.Generic;
 3 using System.ComponentModel;
 4 using System.Data;
 5 using System.Drawing;
 6 using System.Linq;
 7 using System.Text;
 8 using System.Windows.Forms;
 9 using System.Drawing.Imaging;
10 
11 namespace Excel文件处理
12 {
13     public partial class Html : Form
14     {
15         public Html()
16         {
17             InitializeComponent();
18         }
19         private string ImageUrl = "";//图片地址
20         private string ImageName = "";//图片名称
21         private void button1_Click(object sender, EventArgs e)
22         {
23             string HtmlUrl = this.Txt_Url.Text.Trim(); 
24             if (HtmlUrl=="")
25             {
26                 MessageBox.Show("请输入网址");
27                 return;
28             } 
29             if (ImageUrl.Trim()=="")
30             { 
31                 ImageUrl = @"C:UsersAdministratorDesktop";   
32             }
33             try
34             {
35                 Uri ri = new Uri(this.Txt_Url.Text);
36                 Bitmap bit = Print.Test.GetHtmlImage(ri, 1200);
37                 ImageName = this.Txt_Name.Text.Trim();//图片名称
38                 if (ImageName != "")
39                 {
40                     if (ImageName.IndexOf('.') != -1)
41                     {//当用户输入图片后缀时，将后缀截取
42                         ImageName.Substring(0, ImageName.LastIndexOf('.'));
43                     }
44                 }
45                 else
46                     ImageName = DateTime.Now.Ticks.ToString();//时间名称
47                 switch (this.comboBox1.SelectedText)
48                 {
49                     case "GIF": ImageUrl += "\" + ImageName + ".gif"; break;
50                     case "JPG": ImageUrl += "\" + ImageName + ".jpg"; break;
51                     case "PNG": ImageUrl += "\" + ImageName + ".png"; break;
52                     default: ImageUrl += "\" + ImageName + ".png"; break;
53                 }
54 
55                 switch (this.comboBox1.SelectedText)
56                 {
57                     case "GIF": bit.Save(ImageUrl, ImageFormat.Gif); break;
58                     case "JPG": bit.Save(ImageUrl, ImageFormat.Jpeg); break;
59                     case "PNG": bit.Save(ImageUrl, ImageFormat.Png); break;
60                     default: bit.Save(ImageUrl, ImageFormat.Png); break;
61                 }
62 
63                 bit = null;
64                 ImageUrl = "";//图片地址
65                 ImageName = "";//图片名称
66                 MessageBox.Show("生产成功");
67             }
68             catch
69             {
70                 MessageBox.Show("网址输入有误！");
71                 return;
72             }
73            
74         }
75 
76         private void button2_Click(object sender, EventArgs e)
77         { 
78             //获取保存路径
79             if (this.folderBrowserDialog1.ShowDialog()==DialogResult.OK)
80             {
81                 if (this.folderBrowserDialog1.SelectedPath.Trim()!="")
82                 {
83                     ImageUrl = folderBrowserDialog1.SelectedPath;
84                     this.label6.Text = ImageUrl;
85                 }
86             }
87             
88         }
89     }
90 }
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  • 原文地址：https://www.cnblogs.com/xiao-bei/p/3968660.html
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