C#根据文件后缀或文件路径提取文件或文件夹图标ICON
在listview中加上文件图标会使得文件管理展示功能更加美观好看。最近做的一个FTP软件项目中就用到了这样的功能,在ListView中显示文件ICON图标。看截图
是不是很美观,这其中包括:提取图标、记录图标、图标分配、图标大小处理、图标清晰度调节等。
首先来看非常经典的ICON图标提取类,亲测相当好用
using System; using System.Collections.Generic; using System.Drawing; using System.Linq; using System.Runtime.InteropServices; using System.Text; namespace FTPHelper { class MyIcon { [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] public struct SHFILEINFO { public IntPtr hIcon; public int iIcon; public uint dwAttributes; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)] public string szDisplayName; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)] public string szTypeName; } [DllImport("Shell32.dll", EntryPoint = "SHGetFileInfo", SetLastError = true, CharSet = CharSet.Auto)] public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbFileInfo, uint uFlags); [DllImport("User32.dll", EntryPoint = "DestroyIcon")] public static extern int DestroyIcon(IntPtr hIcon); #region API 参数的常量定义 public enum FileInfoFlags : uint { SHGFI_ICON = 0x000000100, // get icon SHGFI_DISPLAYNAME = 0x000000200, // get display name SHGFI_TYPENAME = 0x000000400, // get type name SHGFI_ATTRIBUTES = 0x000000800, // get attributes SHGFI_ICONLOCATION = 0x000001000, // get icon location SHGFI_EXETYPE = 0x000002000, // return exe type SHGFI_SYSICONINDEX = 0x000004000, // get system icon index SHGFI_LINKOVERLAY = 0x000008000, // put a link overlay on icon SHGFI_SELECTED = 0x000010000, // show icon in selected state SHGFI_ATTR_SPECIFIED = 0x000020000, // get only specified attributes SHGFI_LARGEICON = 0x000000000, // get large icon SHGFI_SMALLICON = 0x000000001, // get small icon SHGFI_OPENICON = 0x000000002, // get open icon SHGFI_SHELLICONSIZE = 0x000000004, // get shell size icon SHGFI_PIDL = 0x000000008, // pszPath is a pidl SHGFI_USEFILEATTRIBUTES = 0x000000010, // use passed dwFileAttribute SHGFI_ADDOVERLAYS = 0x000000020, // apply the appropriate overlays SHGFI_OVERLAYINDEX = 0x000000040 // Get the index of the overlay } public enum FileAttributeFlags : uint { FILE_ATTRIBUTE_READONLY = 0x00000001, FILE_ATTRIBUTE_HIDDEN = 0x00000002, FILE_ATTRIBUTE_SYSTEM = 0x00000004, FILE_ATTRIBUTE_DIRECTORY = 0x00000010, FILE_ATTRIBUTE_ARCHIVE = 0x00000020, FILE_ATTRIBUTE_DEVICE = 0x00000040, FILE_ATTRIBUTE_NORMAL = 0x00000080, FILE_ATTRIBUTE_TEMPORARY = 0x00000100, FILE_ATTRIBUTE_SPARSE_FILE = 0x00000200, FILE_ATTRIBUTE_REPARSE_POINT = 0x00000400, FILE_ATTRIBUTE_COMPRESSED = 0x00000800, FILE_ATTRIBUTE_OFFLINE = 0x00001000, FILE_ATTRIBUTE_NOT_CONTENT_INDEXED = 0x00002000, FILE_ATTRIBUTE_ENCRYPTED = 0x00004000 } #endregion /// <summary> /// 获取文件类型的关联图标 /// </summary> /// <param name="fileName">文件类型的扩展名或文件的绝对路径</param> /// <param name="isLargeIcon">是否返回大图标</param> /// <returns>获取到的图标</returns> public static Icon GetIcon(string fileName, bool isLargeIcon) { SHFILEINFO shfi = new SHFILEINFO(); IntPtr hI; if (isLargeIcon) hI = SHGetFileInfo(fileName, 0, ref shfi, (uint)Marshal.SizeOf(shfi), (uint)FileInfoFlags.SHGFI_ICON | (uint)FileInfoFlags.SHGFI_USEFILEATTRIBUTES | (uint)FileInfoFlags.SHGFI_LARGEICON); else hI = SHGetFileInfo(fileName, 0, ref shfi, (uint)Marshal.SizeOf(shfi), (uint)FileInfoFlags.SHGFI_ICON | (uint)FileInfoFlags.SHGFI_USEFILEATTRIBUTES | (uint)FileInfoFlags.SHGFI_SMALLICON); Icon icon = Icon.FromHandle(shfi.hIcon).Clone() as Icon; DestroyIcon(shfi.hIcon); //释放资源 return icon; } /// <summary> /// 获取文件夹图标 /// </summary> /// <returns>图标</returns> public static Icon GetDirectoryIcon(bool isLargeIcon) { SHFILEINFO _SHFILEINFO = new SHFILEINFO(); IntPtr _IconIntPtr; if (isLargeIcon) { _IconIntPtr = SHGetFileInfo(@"", 0, ref _SHFILEINFO, (uint)Marshal.SizeOf(_SHFILEINFO), ((uint)FileInfoFlags.SHGFI_ICON | (uint)FileInfoFlags.SHGFI_LARGEICON)); } else { _IconIntPtr = SHGetFileInfo(@"", 0, ref _SHFILEINFO, (uint)Marshal.SizeOf(_SHFILEINFO), ((uint)FileInfoFlags.SHGFI_ICON | (uint)FileInfoFlags.SHGFI_SMALLICON)); } if (_IconIntPtr.Equals(IntPtr.Zero)) return null; Icon _Icon = System.Drawing.Icon.FromHandle(_SHFILEINFO.hIcon); return _Icon; } } }
该类可直接复制使用,没有报错。
那么在程序中直接使用
获取文件ICON图标:
Icon icon = MyIcon.GetIcon("*.php", false);//可直接获取并返回ICON图标,此处页可以用完整的文件路径
获取文件夹ICON图标:
MyIcon.GetDirectoryIcon(false);
在上面讲述的拥有FTP功能的项目中,博主通过ImageList保存ICON图标信息,包括图标和文件类型。
初次使用时显示效果是这样的
图标比较模糊不清,不能达到很好的效果,几经周折,其实只需要加上一句代码就能实现图一中的效果。
YourImageList.ColorDepth = ColorDepth.Depth32Bit;
其中YourImageList为你的ImageList变量,通过设置这个属性即可让ListView中显示出清晰的ICON图标。