Junstyle's Blog

在一个在线文件管理模块中要显示文件的类型信息，
C#好像不能直接取得文件的类型信息，如：cs文件显示：Visual C# Source file，
网上找到如下代码，备忘

using System;
using System.Runtime.InteropServices;

namespace eWindCMS.Utility
{
public class FileInfoHelper
{

public static string GetTypeName(string fileName)
{
FileInfomation fileInfo = new FileInfomation();  //初始化FileInfomation结构

//调用GetFileInfo函数，最后一个参数说明获取的是文件类型(SHGFI_TYPENAME)
int res = GetFileInfo(fileName, (int)FileAttributeFlags.FILE_ATTRIBUTE_NORMAL, ref fileInfo, Marshal.SizeOf(fileInfo), (int)GetFileInfoFlags.SHGFI_TYPENAME);

return fileInfo.szTypeName;
}

//在shell32.dll导入函数SHGetFileInfo
[DllImport("shell32.dll", EntryPoint="SHGetFileInfo")]
private static extern int GetFileInfo(string pszPath, int dwFileAttributes, ref FileInfomation psfi, int cbFileInfo,int uFlags);

//定义SHFILEINFO结构(名字随便起，这里用FileInfomation)
[StructLayout(LayoutKind.Sequential)]
private struct FileInfomation
{
public IntPtr hIcon;
public int iIcon;
public int dwAttributes;

[MarshalAs(UnmanagedType.ByValTStr, SizeConst=260)]
public string szDisplayName;

[MarshalAs(UnmanagedType.ByValTStr, SizeConst=80)]
public string szTypeName;
}

//定义文件属性标识
private enum FileAttributeFlags : int
{
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
}

//定义获取资源标识
private enum GetFileInfoFlags : int
{
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
}
}
}