73 lines
2.4 KiB
C#
73 lines
2.4 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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namespace GeekDesk.Util
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{
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/// <summary>
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/// 保存文件信息的结构体
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/// </summary>
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///
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[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
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struct SHFILEINFO
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{
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public IntPtr hIcon;
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public int iIcon;
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public uint dwAttributes;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
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public string szDisplayName;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
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public string szTypeName;
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}
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class NativeMethods
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{
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[DllImport("Shell32.dll", EntryPoint = "SHGetFileInfo", SetLastError = true, CharSet = CharSet.Auto)]
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public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbFileInfo, uint uFlags);
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[DllImport("User32.dll", EntryPoint = "DestroyIcon")]
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public static extern int DestroyIcon(IntPtr hIcon);
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#region API 参数的常量定义
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public const uint SHGFI_ICON = 0x100;
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public const uint SHGFI_LARGEICON = 0x0; //大图标 32×32
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public const uint SHGFI_SMALLICON = 0x1; //小图标 16×16
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public const uint SHGFI_USEFILEATTRIBUTES = 0x10;
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#endregion
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/// <summary>
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/// 获取文件类型的关联图标
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/// </summary>
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/// <param name="fileName">文件类型的扩展名或文件的绝对路径</param>
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/// <param name="isLargeIcon">是否返回大图标</param>
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/// <returns>获取到的图标</returns>
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static Icon GetIcon(string fileName, bool isLargeIcon)
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{
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SHFILEINFO shfi = new SHFILEINFO();
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IntPtr hI;
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if (isLargeIcon)
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hI = NativeMethods.SHGetFileInfo(fileName, 0, ref shfi, (uint)Marshal.SizeOf(shfi), NativeMethods.SHGFI_ICON | NativeMethods.SHGFI_USEFILEATTRIBUTES | NativeMethods.SHGFI_LARGEICON);
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else
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hI = NativeMethods.SHGetFileInfo(fileName, 0, ref shfi, (uint)Marshal.SizeOf(shfi), NativeMethods.SHGFI_ICON | NativeMethods.SHGFI_USEFILEATTRIBUTES | NativeMethods.SHGFI_SMALLICON);
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Icon icon = Icon.FromHandle(shfi.hIcon).Clone() as Icon;
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NativeMethods.DestroyIcon(shfi.hIcon); //释放资源
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return icon;
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}
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}
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}
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