HI,
Windows提供文件扩展名的描述,如.cpl文件的“控制面板项目”和.daa文件的“PowerISO文件”。 有什么办法可以在.NET中获得这些数据? 即时通讯使用C#,但可以阅读所有其他的.NET语言。 还有一种方法来获得扩展的默认图标? 任何帮助,将不胜感激。
提前致谢
您可以使用SHGetFileInfo
API来获取该信息。 这是一个包装方法:
public static string GetFileTypeDescription(string fileNameOrExtension) { SHFILEINFO shfi; if (IntPtr.Zero != SHGetFileInfo( fileNameOrExtension, FILE_ATTRIBUTE_NORMAL, out shfi, (uint)Marshal.SizeOf(typeof(SHFILEINFO)), SHGFI_USEFILEATTRIBUTES | SHGFI_TYPENAME)) { return shfi.szTypeName; } return null; } [DllImport("shell32")] private static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, out SHFILEINFO psfi, uint cbFileInfo, uint flags); [StructLayout(LayoutKind.Sequential)] private 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; } private const uint FILE_ATTRIBUTE_READONLY = 0x00000001; private const uint FILE_ATTRIBUTE_HIDDEN = 0x00000002; private const uint FILE_ATTRIBUTE_SYSTEM = 0x00000004; private const uint FILE_ATTRIBUTE_DIRECTORY = 0x00000010; private const uint FILE_ATTRIBUTE_ARCHIVE = 0x00000020; private const uint FILE_ATTRIBUTE_DEVICE = 0x00000040; private const uint FILE_ATTRIBUTE_NORMAL = 0x00000080; private const uint FILE_ATTRIBUTE_TEMPORARY = 0x00000100; private const uint FILE_ATTRIBUTE_SPARSE_FILE = 0x00000200; private const uint FILE_ATTRIBUTE_REPARSE_POINT = 0x00000400; private const uint FILE_ATTRIBUTE_COMPRESSED = 0x00000800; private const uint FILE_ATTRIBUTE_OFFLINE = 0x00001000; private const uint FILE_ATTRIBUTE_NOT_CONTENT_INDEXED = 0x00002000; private const uint FILE_ATTRIBUTE_ENCRYPTED = 0x00004000; private const uint FILE_ATTRIBUTE_VIRTUAL = 0x00010000; private const uint SHGFI_ICON = 0x000000100; // get icon private const uint SHGFI_DISPLAYNAME = 0x000000200; // get display name private const uint SHGFI_TYPENAME = 0x000000400; // get type name private const uint SHGFI_ATTRIBUTES = 0x000000800; // get attributes private const uint SHGFI_ICONLOCATION = 0x000001000; // get icon location private const uint SHGFI_EXETYPE = 0x000002000; // return exe type private const uint SHGFI_SYSICONINDEX = 0x000004000; // get system icon index private const uint SHGFI_LINKOVERLAY = 0x000008000; // put a link overlay on icon private const uint SHGFI_SELECTED = 0x000010000; // show icon in selected state private const uint SHGFI_ATTR_SPECIFIED = 0x000020000; // get only specified attributes private const uint SHGFI_LARGEICON = 0x000000000; // get large icon private const uint SHGFI_SMALLICON = 0x000000001; // get small icon private const uint SHGFI_OPENICON = 0x000000002; // get open icon private const uint SHGFI_SHELLICONSIZE = 0x000000004; // get shell size icon private const uint SHGFI_PIDL = 0x000000008; // pszPath is a pidl private const uint SHGFI_USEFILEATTRIBUTES = 0x000000010; // use passed dwFileAttribute
(大部分的常量并没有在代码中实际使用,但是为了适应您的特定需求,我还是把它们放在了这里)
扩展名与HKEY_CLASSES_ROOT键相关联。 因此,您需要打开注册表并找到您感兴趣的值。您还应该能够在其中找到默认图标。
这里是一个示例项目(我没有尝试过)。
可以说你的扩展名是.xyz为了显示大多数用户友好的文本,如“控制面板项目”,你应该做两件事情:
你可以像这样搜索注册表:
HKEY_CLASSES_ROOT
搜索扩展名的默认值。 例如HKEY_CLASSES_ROOT\.txt
的默认值是txtfile
。 HKEY_CLASSES_ROOT\txtfile
的默认值是Text Document
。 两次搜索后,答案是文本文档 。
您可以通过RegEdit
测试任何其他扩展名。
访问此链接: http : //www.codeproject.com/KB/cs/GetFileTypeAndIcon.aspx?display=Print
这是执行这两个搜索:
public static class Helper { public static string GetFileDescription(string fileName) { if (fileName == null) { throw new ArgumentNullException("fileName"); } RegistryKey registryKey1 = null; RegistryKey registryKey2 = null; try { FileInfo fileInfo = new FileInfo(fileName); if (string.IsNullOrEmpty(fileInfo.Extension)) { return string.Empty; } string extension = fileInfo.Extension.ToLowerInvariant(); registryKey1 = Registry.ClassesRoot.OpenSubKey(extension); if (registryKey1 == null) { return string.Empty; } object extensionDefaultObject = registryKey1.GetValue(null); if (!(extensionDefaultObject is string)) { return string.Empty; } string extensionDefaultValue = (string)extensionDefaultObject; registryKey2 = Registry.ClassesRoot.OpenSubKey(extensionDefaultValue); if (registryKey2 == null) { return string.Empty; } object fileDescriptionObject = registryKey2.GetValue(null); if (!(fileDescriptionObject is string)) { return string.Empty; } string fileDescription = (string)fileDescriptionObject; return fileDescription; } catch (Exception) { return null; } finally { if (registryKey2 != null) { registryKey2.Close(); } if (registryKey1 != null) { registryKey1.Close(); } } } }