1.FileInfoStruct
[StructLayout( LayoutKind.Sequential)]
public   struct  FileInfoStruct
...{
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;
} 2.FileInfoFlags
public   enum  FileInfoFlags :  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 
    } 3.FileAttributeFlags(这个.net中好像已经有了)
public   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
}