1 /// <summary>
2 /// 根据文件后缀名获取系统图标。
3 /// </summary>
4 /// <param name="extension"></param>
5 /// <returns></returns>
6 public static ImageSource GetIconByExtension(string extension)
7 {
8 Icon smallIcon = null;
9 Icon bigIcon = null;
10 string describle = "";
11 GetExtsIconAndDescription(extension, out bigIcon, out smallIcon, out describle);
12 if (bigIcon != null)
13 {
14 Bitmap bitmap = bigIcon.ToBitmap();
15 IntPtr hBitmap = bitmap.GetHbitmap();
16 ImageSource imageSource =
17 System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
18 hBitmap, IntPtr.Zero, Int32Rect.Empty,
19 BitmapSizeOptions.FromEmptyOptions());
20 return imageSource;
21 }
22 /// <summary>
23 /// 通过扩展名得到图标和描述
24 /// </summary>
25 /// <param name="ext">扩展名</param>
26 /// <param name="LargeIcon">得到大图标</param>
27 /// <param name="smallIcon">得到小图标</param>
28 public static void GetExtsIconAndDescription(string ext, out Icon largeIcon, out Icon smallIcon, out string description)
29 {
30 largeIcon = smallIcon = null;
31 description = "";
32 var extsubkey = Registry.ClassesRoot.OpenSubKey(ext); //从注册表中读取扩展名相应的子键
33 if (extsubkey != null)
34 {
35 var extdefaultvalue = (string)extsubkey.GetValue(null); //取出扩展名对应的文件类型名称
36
37 //未取到值，返回预设图标
38 if (extdefaultvalue == null)
39 {
40 GetDefaultIcon(out largeIcon, out smallIcon);
41 return;
42 }
43
44 var typesubkey = Registry.ClassesRoot.OpenSubKey(extdefaultvalue); //从注册表中读取文件类型名称的相应子键
45 if (typesubkey != null)
46 {
47 description = (string)typesubkey.GetValue(null); //得到类型描述字符串
48 var defaulticonsubkey = typesubkey.OpenSubKey("DefaultIcon"); //取默认图标子键
49 if (defaulticonsubkey != null)
50 {
51 //得到图标来源字符串
52 var defaulticon = (string)defaulticonsubkey.GetValue(null); //取出默认图标来源字符串
53 var iconstringArray = defaulticon.Split(',');
54 int nIconIndex = 0;
55 if (iconstringArray.Length > 1) int.TryParse(iconstringArray[1], out nIconIndex);
56 //得到图标
57 System.IntPtr phiconLarge = new IntPtr();
58 System.IntPtr phiconSmall = new IntPtr();
59 ExtractIconExW(iconstringArray[0].Trim('"'), nIconIndex, ref phiconLarge, ref phiconSmall, 1);
60 if (phiconLarge.ToInt32() > 0) largeIcon = Icon.FromHandle(phiconLarge);
61 if (phiconSmall.ToInt32() > 0) smallIcon = Icon.FromHandle(phiconSmall);
62 }
63 }
64 }
65 }
66 /// <summary>
67 /// 获取缺省图标
68 /// </summary>
69 /// <param name="largeIcon"></param>
70 /// <param name="smallIcon"></param>
71 public static void GetDefaultIcon(out Icon largeIcon, out Icon smallIcon)
72 {
73 largeIcon = smallIcon = null;
74 System.IntPtr phiconLarge = new IntPtr();
75 System.IntPtr phiconSmall = new IntPtr();
76 ExtractIconExW(Path.Combine(Environment.SystemDirectory, "shell32.dll"), 0, ref phiconLarge, ref phiconSmall, 1);
77 if (phiconLarge.ToInt32() > 0) largeIcon = Icon.FromHandle(phiconLarge);
78 if (phiconSmall.ToInt32() > 0) smallIcon = Icon.FromHandle(phiconSmall);
79 }
80 /// Return Type: UINT->unsigned int
81 ///lpszFile: LPCWSTR->WCHAR*
82 ///nIconIndex: int
83 ///phiconLarge: HICON*
84 ///phiconSmall: HICON*
85 ///nIcons: UINT->unsigned int
86 [DllImportAttribute("shell32.dll", EntryPoint = "ExtractIconExW", CallingConvention = System.Runtime.InteropServices.CallingConvention.StdCall)]
87 public static extern uint ExtractIconExW([System.Runtime.InteropServices.InAttribute()] [System.Runtime.InteropServices.MarshalAsAttribute(UnmanagedType.LPWStr)] string lpszFile, int nIconIndex, ref IntPtr phiconLarge, ref IntPtr phiconSmall, uint nIcons);
88
89 public static void CreateFileIcon(string fileType, out Icon large, out Icon small)
90 {
91 string des;
92
93 if (fileType.Trim() == "") //预设图标
94 {
95 GetDefaultIcon(out large, out small);
96 }
97 else if (fileType.ToUpper() == ".EXE") //应用程序图标单独获取
98 {
99 IntPtr l = IntPtr.Zero;
100 IntPtr s = IntPtr.Zero;
101
102 ExtractIconExW(Path.Combine(Environment.SystemDirectory, "shell32.dll"), 2, ref l, ref s, 1);
103
104 large = Icon.FromHandle(l);
105 small = Icon.FromHandle(s);
106 }
107 else //其它类型的图标
108 {
109 GetExtsIconAndDescription(fileType, out large, out small, out des);
110 }
111
112 if ((large == null) || (small == null)) //无法获取图标,预设图标
113 GetDefaultIcon(out large, out small);
114 }
115 public static byte[] ImageToByte(Image image)
116 {
117 MemoryStream ms = new MemoryStream();
118 image.Save(ms, ImageFormat.Bmp);
119 byte[] bs = ms.ToArray();
120 ms.Close();
121 return bs;
122 }
123
124 public static Image ByteToImage(byte[] bs)
125 {
126 MemoryStream ms = new MemoryStream(bs);
127 Bitmap bmp = new Bitmap(ms);
128 ms.Close();
129 return bmp;
130 }
131 [StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)]
132 public struct HICON__
133 {
134 public int unused;
135 }
136 return null;
137 }
