1 /// <summary>
2 /// 图片类型枚举
3 /// </summary>
4 public enum ImageType
5 {
6 GIF = 0,
7 JPG = 1,
8 PNG = 2
9 }
10
11 /// <summary>
12 /// 图片辅助类
13 /// </summary>
14 public class ImageHelper
15 {
16 /// <summary>
17 /// 将Url地址保存为图片
18 /// </summary>
19 /// <param name="url">网页路径</param>
20 /// <param name="savePath">图片存放路径</param>
21 /// <param name="imageType">图片类型</param>
22 /// <returns></returns>
23 public static string SaveUrlToImage(string url, string savePath, ImageType imageType)
24 {
25 var uri = new Uri(url);
26 using (var bit = GetHtmlImage(uri, Screen.PrimaryScreen.Bounds.Width))
27 {
28 switch (imageType)
29 {
30 case ImageType.GIF:
31 bit.Save(savePath, ImageFormat.Gif);
32 break;
33 case ImageType.JPG:
34 bit.Save(savePath, ImageFormat.Jpeg);
35 break;
36 case ImageType.PNG:
37 bit.Save(savePath, ImageFormat.Png);
38 break;
39 default:
40 bit.Save(savePath, ImageFormat.Jpeg);
41 break;
42 }
43 return savePath;
44 }
45 }
46
47 protected static Bitmap GetHtmlImage(Uri urlString, int width)
48 {
49 using (var control = new WebBrowser { Size = new Size(width, 10), Url = urlString, ScriptErrorsSuppressed = true })
50 {
51 while (control.ReadyState != WebBrowserReadyState.Complete)
52 {
53 Application.DoEvents();
54 }
55 if (control.Document != null)
56 {
57 if (control.Document.Body != null)
58 {
59 control.Height = control.Document.Body.ScrollRectangle.Height + 20;
60 }
61 }
62 control.Url = urlString;
63 var snap = new WebControlImage.Snapshot();
64 var bitmap = snap.TakeSnapshot(control.ActiveXInstance, new Rectangle(0, 0, control.Width, control.Height));
65 control.Dispose();
66 return bitmap;
67 }
68 }
69
70 /// WebBrowser获取图形
71 protected class WebControlImage
72 {
73 internal static class NativeMethods
74 {
75 [StructLayout(LayoutKind.Sequential)]
76 public sealed class TagDvtargetdevice
77 {
78 [MarshalAs(UnmanagedType.U4)]
79 public int tdSize;
80 [MarshalAs(UnmanagedType.U2)]
81 public short tdDriverNameOffset;
82 [MarshalAs(UnmanagedType.U2)]
83 public short tdDeviceNameOffset;
84 [MarshalAs(UnmanagedType.U2)]
85 public short tdPortNameOffset;
86 [MarshalAs(UnmanagedType.U2)]
87 public short tdExtDevmodeOffset;
88 }
89
90 [StructLayout(LayoutKind.Sequential)]
91 public class Comrect
92 {
93 public int left;
94 public int top;
95 public int right;
96 public int bottom;
97
98 public Comrect()
99 {
100 }
101
102 public Comrect(Rectangle r)
103 {
104 left = r.X;
105 top = r.Y;
106 right = r.Right;
107 bottom = r.Bottom;
108 }
109
110 public Comrect(int left, int top, int right, int bottom)
111 {
112 this.left = left;
113 this.top = top;
114 this.right = right;
115 this.bottom = bottom;
116 }
117
118 public static Comrect FromXywh(int x, int y, int width, int height)
119 {
120 return new Comrect(x, y, x + width, y + height);
121 }
122
123 public override string ToString()
124 {
125 return string.Concat("Left = ", left, " Top ", top, " Right = ", right, " Bottom = ", bottom);
126 }
127 }
128
129 [StructLayout(LayoutKind.Sequential)]
130 public sealed class TagLogpalette
131 {
132 [MarshalAs(UnmanagedType.U2)]
133 public short palVersion;
134 [MarshalAs(UnmanagedType.U2)]
135 public short palNumEntries;
136 }
137 }
138
139 public class Snapshot
140 {
141 /// 图象大小
142 public Bitmap TakeSnapshot(object pUnknown, Rectangle bmpRect)
143 {
144 if (pUnknown == null) { return null; }
145 //必须为com对象
146 if (!Marshal.IsComObject(pUnknown)) { return null; }
147 //IViewObject 接口
148 IntPtr viewObject;
149 //内存图
150 var bitmap = new Bitmap(bmpRect.Width, bmpRect.Height);
151 var image = Graphics.FromImage(bitmap);
152 //获取接口
153 object hret = Marshal.QueryInterface(Marshal.GetIUnknownForObject(pUnknown), ref UnsafeNativeMethods.IidIViewObject, out viewObject);
154 try
155 {
156 var o = (UnsafeNativeMethods.IViewObject)Marshal.GetTypedObjectForIUnknown(viewObject, typeof(UnsafeNativeMethods.IViewObject));
157 //调用Draw方法
158 if (o != null)
159 {
160 o.Draw((int)DVASPECT.DVASPECT_CONTENT, -1, IntPtr.Zero, null, IntPtr.Zero, image.GetHdc(), new NativeMethods.Comrect(bmpRect), null, IntPtr.Zero, 0);
161 }
162 }
163 catch (Exception ex)
164 {
165 Console.WriteLine(ex.Message);
166 throw;
167 }
168 //释放
169 image.Dispose();
170 return bitmap;
171 }
172 }
173
174 [SuppressUnmanagedCodeSecurity]
175 internal static class UnsafeNativeMethods
176 {
177 public static Guid IidIViewObject = new Guid("{0000010d-0000-0000-C000-000000000046}");
178
179 [ComImport, Guid("0000010d-0000-0000-C000-000000000046"),
180 InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
181 public interface IViewObject
182 {
183 [PreserveSig]
184 int Draw([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, int lindex, IntPtr pvAspect,
185 [In] NativeMethods.TagDvtargetdevice ptd, IntPtr hdcTargetDev, IntPtr hdcDraw,
186 [In] NativeMethods.Comrect lprcBounds, [In] NativeMethods.Comrect lprcWBounds,
187 IntPtr pfnContinue,
188 [In] int dwContinue);
189
190 [PreserveSig]
191 int GetColorSet([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, int lindex, IntPtr pvAspect,
192 [In] NativeMethods.TagDvtargetdevice ptd, IntPtr hicTargetDev,
193 [Out] NativeMethods.TagLogpalette ppColorSet);
194
195 [PreserveSig]
196 int Freeze([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, int lindex, IntPtr pvAspect,
197 [Out] IntPtr pdwFreeze);
198
199 [PreserveSig]
200 int Unfreeze([In, MarshalAs(UnmanagedType.U4)] int dwFreeze);
201
202 void SetAdvise([In, MarshalAs(UnmanagedType.U4)] int aspects,
203 [In, MarshalAs(UnmanagedType.U4)] int advf,
204 [In, MarshalAs(UnmanagedType.Interface)] IAdviseSink pAdvSink);
205
206 void GetAdvise([In, Out, MarshalAs(UnmanagedType.LPArray)] int[] paspects,
207 [In, Out, MarshalAs(UnmanagedType.LPArray)] int[] advf,
208 [In, Out, MarshalAs(UnmanagedType.LPArray)] IAdviseSink[] pAdvSink);
209 }
210 }
211 }
212 }
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