Historycznie te właściwości zostały określone przez technologię o nazwie "Structured Storage". Pierwsza implementacja Structured Storage to pradawna (ale wciąż bardzo żywa) usługa. Następnie Microsoft dodał funkcje Structured Storage directly into NTFS. Pozwala to na zdefiniowanie właściwości, takich jak autor lub tytuł, w dowolnych plikach (nawet w txt). Chociaż interfejs użytkownika Explorera z jakiegoś powodu nie pozwala ci tego zrobić, myślę, że nadal działa programowo.
Następnie, z Vistą, Microsoft zrestartował wszystko i wprowadził nadzbiór tego wszystkiego: Windows Property System.
Niestety, nie ma w tym wszystkim platformy .NET API. Ale Microsoft stworzył otwartą bibliotekę .NET o nazwie Windows API CodePack. Więc, najprostszym sposobem, aby wyodrębnić właściwości jest dodać odwołanie do WindowsAPICodePack podstawowej NugetPackage i można go używać tak:
static void Main(string[] args)
{
foreach (var prop in new ShellPropertyCollection(@"mypath\myfile"))
{
Console.WriteLine(prop.CanonicalName + "=" + prop.ValueAsObject);
}
}
Jeśli nie chcesz dodać dodatkowe dll, a następnie można wyodrębnić kod powłoki ShellPropertyCollection ze źródła WindowsAPICodePack (Windows API Code Pack: Where is it?). To dość praca, ale wykonalna.
Innym rozwiązaniem w twoim przypadku jest użycie starego natywnego API Structure Storage. Dostarczyłem próbkę, która to robi. Oto, jak możesz go użyć:
static void Main(string[] args)
{
foreach (var prop in new StructuredStorage(@"mypath\myfile").Properties)
{
Console.WriteLine(prop.Name + "=" + prop.Value);
}
}
public sealed class StructuredStorage
{
public static readonly Guid SummaryInformationFormatId = new Guid("{F29F85E0-4FF9-1068-AB91-08002B27B3D9}");
public static readonly Guid DocSummaryInformationFormatId = new Guid("{D5CDD502-2E9C-101B-9397-08002B2CF9AE}");
public static readonly Guid UserDefinedPropertiesId = new Guid("{D5CDD505-2E9C-101B-9397-08002B2CF9AE}");
private List<StructuredProperty> _properties = new List<StructuredProperty>();
public StructuredStorage(string filePath)
{
if (filePath == null)
throw new ArgumentNullException("filePath");
FilePath = filePath;
IPropertySetStorage propertySetStorage;
int hr = StgOpenStorageEx(FilePath, STGM.STGM_READ | STGM.STGM_SHARE_DENY_NONE | STGM.STGM_DIRECT_SWMR, STGFMT.STGFMT_ANY, 0, IntPtr.Zero, IntPtr.Zero, typeof(IPropertySetStorage).GUID, out propertySetStorage);
if (hr == STG_E_FILENOTFOUND || hr == STG_E_PATHNOTFOUND)
throw new FileNotFoundException(null, FilePath);
if (hr != 0)
throw new Win32Exception(hr);
try
{
LoadPropertySet(propertySetStorage, SummaryInformationFormatId);
LoadPropertySet(propertySetStorage, DocSummaryInformationFormatId);
}
finally
{
Marshal.ReleaseComObject(propertySetStorage);
}
// for some reason we can't read this one on the same COM ref?
LoadProperties(UserDefinedPropertiesId);
}
public string FilePath { get; private set; }
public IReadOnlyList<StructuredProperty> Properties
{
get
{
return _properties;
}
}
private void LoadPropertySet(IPropertySetStorage propertySetStorage, Guid fmtid)
{
IPropertyStorage propertyStorage;
int hr = propertySetStorage.Open(fmtid, STGM.STGM_READ | STGM.STGM_SHARE_EXCLUSIVE, out propertyStorage);
if (hr == STG_E_FILENOTFOUND || hr == STG_E_ACCESSDENIED)
return;
if (hr != 0)
throw new Win32Exception(hr);
IEnumSTATPROPSTG es;
propertyStorage.Enum(out es);
if (es == null)
return;
try
{
var stg = new STATPROPSTG();
int fetched;
do
{
hr = es.Next(1, ref stg, out fetched);
if (hr != 0 && hr != 1)
throw new Win32Exception(hr);
if (fetched == 1)
{
string name = GetPropertyName(fmtid, propertyStorage, stg);
var propsec = new PROPSPEC[1];
propsec[0] = new PROPSPEC();
propsec[0].ulKind = stg.lpwstrName != null ? PRSPEC.PRSPEC_LPWSTR : PRSPEC.PRSPEC_PROPID;
IntPtr lpwstr = IntPtr.Zero;
if (stg.lpwstrName != null)
{
lpwstr = Marshal.StringToCoTaskMemUni(stg.lpwstrName);
propsec[0].union.lpwstr = lpwstr;
}
else
{
propsec[0].union.propid = stg.propid;
}
var vars = new PROPVARIANT[1];
vars[0] = new PROPVARIANT();
try
{
hr = propertyStorage.ReadMultiple(1, propsec, vars);
if (hr != 0)
throw new Win32Exception(hr);
}
finally
{
if (lpwstr != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(lpwstr);
}
}
object value;
try
{
switch (vars[0].vt)
{
case VARTYPE.VT_BOOL:
value = vars[0].union.boolVal != 0 ? true : false;
break;
case VARTYPE.VT_BSTR:
value = Marshal.PtrToStringUni(vars[0].union.bstrVal);
break;
case VARTYPE.VT_CY:
value = decimal.FromOACurrency(vars[0].union.cyVal);
break;
case VARTYPE.VT_DATE:
value = DateTime.FromOADate(vars[0].union.date);
break;
case VARTYPE.VT_DECIMAL:
IntPtr dec = IntPtr.Zero;
Marshal.StructureToPtr(vars[0], dec, false);
value = Marshal.PtrToStructure(dec, typeof(decimal));
break;
case VARTYPE.VT_DISPATCH:
value = Marshal.GetObjectForIUnknown(vars[0].union.pdispVal);
break;
case VARTYPE.VT_ERROR:
case VARTYPE.VT_HRESULT:
value = vars[0].union.scode;
break;
case VARTYPE.VT_FILETIME:
value = DateTime.FromFileTime(vars[0].union.filetime);
break;
case VARTYPE.VT_I1:
value = vars[0].union.cVal;
break;
case VARTYPE.VT_I2:
value = vars[0].union.iVal;
break;
case VARTYPE.VT_I4:
value = vars[0].union.lVal;
break;
case VARTYPE.VT_I8:
value = vars[0].union.hVal;
break;
case VARTYPE.VT_INT:
value = vars[0].union.intVal;
break;
case VARTYPE.VT_LPSTR:
value = Marshal.PtrToStringAnsi(vars[0].union.pszVal);
break;
case VARTYPE.VT_LPWSTR:
value = Marshal.PtrToStringUni(vars[0].union.pwszVal);
break;
case VARTYPE.VT_R4:
value = vars[0].union.fltVal;
break;
case VARTYPE.VT_R8:
value = vars[0].union.dblVal;
break;
case VARTYPE.VT_UI1:
value = vars[0].union.bVal;
break;
case VARTYPE.VT_UI2:
value = vars[0].union.uiVal;
break;
case VARTYPE.VT_UI4:
value = vars[0].union.ulVal;
break;
case VARTYPE.VT_UI8:
value = vars[0].union.uhVal;
break;
case VARTYPE.VT_UINT:
value = vars[0].union.uintVal;
break;
case VARTYPE.VT_UNKNOWN:
value = Marshal.GetObjectForIUnknown(vars[0].union.punkVal);
break;
default:
value = null;
break;
}
}
finally
{
PropVariantClear(ref vars[0]);
}
var property = new StructuredProperty(fmtid, name, stg.propid);
property.Value = value;
_properties.Add(property);
}
}
while (fetched == 1);
}
finally
{
Marshal.ReleaseComObject(es);
}
}
private static string GetPropertyName(Guid fmtid, IPropertyStorage propertyStorage, STATPROPSTG stg)
{
if (!string.IsNullOrEmpty(stg.lpwstrName))
return stg.lpwstrName;
var propids = new int[1];
propids[0] = stg.propid;
var names = new string[1];
names[0] = null;
int hr = propertyStorage.ReadPropertyNames(1, propids, names);
if (hr == 0)
return names[0];
return null;
}
public void LoadProperties(Guid formatId)
{
IPropertySetStorage propertySetStorage;
int hr = StgOpenStorageEx(FilePath, STGM.STGM_READ | STGM.STGM_SHARE_DENY_NONE | STGM.STGM_DIRECT_SWMR, STGFMT.STGFMT_ANY, 0, IntPtr.Zero, IntPtr.Zero, typeof(IPropertySetStorage).GUID, out propertySetStorage);
if (hr == STG_E_FILENOTFOUND || hr == STG_E_PATHNOTFOUND)
throw new FileNotFoundException(null, FilePath);
if (hr != 0)
throw new Win32Exception(hr);
try
{
LoadPropertySet(propertySetStorage, formatId);
}
finally
{
Marshal.ReleaseComObject(propertySetStorage);
}
}
private const int STG_E_FILENOTFOUND = unchecked((int)0x80030002);
private const int STG_E_PATHNOTFOUND = unchecked((int)0x80030003);
private const int STG_E_ACCESSDENIED = unchecked((int)0x80030005);
private enum PRSPEC
{
PRSPEC_LPWSTR = 0,
PRSPEC_PROPID = 1
}
private enum STGFMT
{
STGFMT_ANY = 4,
}
[Flags]
private enum STGM
{
STGM_READ = 0x00000000,
STGM_READWRITE = 0x00000002,
STGM_SHARE_DENY_NONE = 0x00000040,
STGM_SHARE_DENY_WRITE = 0x00000020,
STGM_SHARE_EXCLUSIVE = 0x00000010,
STGM_DIRECT_SWMR = 0x00400000
}
// we only define what we handle
private enum VARTYPE : short
{
VT_I2 = 2,
VT_I4 = 3,
VT_R4 = 4,
VT_R8 = 5,
VT_CY = 6,
VT_DATE = 7,
VT_BSTR = 8,
VT_DISPATCH = 9,
VT_ERROR = 10,
VT_BOOL = 11,
VT_UNKNOWN = 13,
VT_DECIMAL = 14,
VT_I1 = 16,
VT_UI1 = 17,
VT_UI2 = 18,
VT_UI4 = 19,
VT_I8 = 20,
VT_UI8 = 21,
VT_INT = 22,
VT_UINT = 23,
VT_HRESULT = 25,
VT_LPSTR = 30,
VT_LPWSTR = 31,
VT_FILETIME = 64,
}
[StructLayout(LayoutKind.Explicit)]
private struct PROPVARIANTunion
{
[FieldOffset(0)]
public sbyte cVal;
[FieldOffset(0)]
public byte bVal;
[FieldOffset(0)]
public short iVal;
[FieldOffset(0)]
public ushort uiVal;
[FieldOffset(0)]
public int lVal;
[FieldOffset(0)]
public uint ulVal;
[FieldOffset(0)]
public int intVal;
[FieldOffset(0)]
public uint uintVal;
[FieldOffset(0)]
public long hVal;
[FieldOffset(0)]
public ulong uhVal;
[FieldOffset(0)]
public float fltVal;
[FieldOffset(0)]
public double dblVal;
[FieldOffset(0)]
public short boolVal;
[FieldOffset(0)]
public int scode;
[FieldOffset(0)]
public long cyVal;
[FieldOffset(0)]
public double date;
[FieldOffset(0)]
public long filetime;
[FieldOffset(0)]
public IntPtr bstrVal;
[FieldOffset(0)]
public IntPtr pszVal;
[FieldOffset(0)]
public IntPtr pwszVal;
[FieldOffset(0)]
public IntPtr punkVal;
[FieldOffset(0)]
public IntPtr pdispVal;
}
[StructLayout(LayoutKind.Sequential)]
private struct PROPSPEC
{
public PRSPEC ulKind;
public PROPSPECunion union;
}
[StructLayout(LayoutKind.Explicit)]
private struct PROPSPECunion
{
[FieldOffset(0)]
public int propid;
[FieldOffset(0)]
public IntPtr lpwstr;
}
[StructLayout(LayoutKind.Sequential)]
private struct PROPVARIANT
{
public VARTYPE vt;
public ushort wReserved1;
public ushort wReserved2;
public ushort wReserved3;
public PROPVARIANTunion union;
}
[StructLayout(LayoutKind.Sequential)]
private struct STATPROPSTG
{
[MarshalAs(UnmanagedType.LPWStr)]
public string lpwstrName;
public int propid;
public VARTYPE vt;
}
[StructLayout(LayoutKind.Sequential)]
private struct STATPROPSETSTG
{
public Guid fmtid;
public Guid clsid;
public uint grfFlags;
public System.Runtime.InteropServices.ComTypes.FILETIME mtime;
public System.Runtime.InteropServices.ComTypes.FILETIME ctime;
public System.Runtime.InteropServices.ComTypes.FILETIME atime;
public uint dwOSVersion;
}
[DllImport("ole32.dll")]
private static extern int StgOpenStorageEx([MarshalAs(UnmanagedType.LPWStr)] string pwcsName, STGM grfMode, STGFMT stgfmt, int grfAttrs, IntPtr pStgOptions, IntPtr reserved2, [MarshalAs(UnmanagedType.LPStruct)] Guid riid, out IPropertySetStorage ppObjectOpen);
[DllImport("ole32.dll")]
private static extern int PropVariantClear(ref PROPVARIANT pvar);
[Guid("0000013B-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
private interface IEnumSTATPROPSETSTG
{
[PreserveSig]
int Next(int celt, ref STATPROPSETSTG rgelt, out int pceltFetched);
// rest ommited
}
[Guid("00000139-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
private interface IEnumSTATPROPSTG
{
[PreserveSig]
int Next(int celt, ref STATPROPSTG rgelt, out int pceltFetched);
// rest ommited
}
[Guid("00000138-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
private interface IPropertyStorage
{
[PreserveSig]
int ReadMultiple(uint cpspec, [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 0)] PROPSPEC[] rgpspec, [Out, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 0)] PROPVARIANT[] rgpropvar);
[PreserveSig]
int WriteMultiple(uint cpspec, [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 0)] PROPSPEC[] rgpspec, [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 0)] PROPVARIANT[] rgpropvar, uint propidNameFirst);
[PreserveSig]
int DeleteMultiple(uint cpspec, [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 0)] PROPSPEC[] rgpspec);
[PreserveSig]
int ReadPropertyNames(uint cpropid, [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 0)] int[] rgpropid, [Out, MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.LPWStr, SizeParamIndex = 0)] string[] rglpwstrName);
[PreserveSig]
int NotDeclared1();
[PreserveSig]
int NotDeclared2();
[PreserveSig]
int Commit(uint grfCommitFlags);
[PreserveSig]
int NotDeclared3();
[PreserveSig]
int Enum(out IEnumSTATPROPSTG ppenum);
// rest ommited
}
[Guid("0000013A-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
private interface IPropertySetStorage
{
[PreserveSig]
int Create([MarshalAs(UnmanagedType.LPStruct)] Guid rfmtid, [MarshalAs(UnmanagedType.LPStruct)] Guid pclsid, uint grfFlags, STGM grfMode, out IPropertyStorage ppprstg);
[PreserveSig]
int Open([MarshalAs(UnmanagedType.LPStruct)] Guid rfmtid, STGM grfMode, out IPropertyStorage ppprstg);
[PreserveSig]
int NotDeclared3();
[PreserveSig]
int Enum(out IEnumSTATPROPSETSTG ppenum);
}
}
public sealed class StructuredProperty
{
public StructuredProperty(Guid formatId, string name, int id)
{
FormatId = formatId;
Name = name;
Id = id;
}
public Guid FormatId { get; private set; }
public string Name { get; private set; }
public int Id { get; private set; }
public object Value { get; set; }
public override string ToString()
{
return Name;
}
}
Co masz na myśli - instalowanie innych DLL? Ponieważ dowolna biblioteka dll, której używasz, będzie obecna w preinstalowanej wersji .NetFramework. Czy jest jakiś dll, który masz na myśli poza biblioteką .NetFramework – CarbineCoder
@ CarbineCoder jak DSOfile.dll, to dobrze, jeśli mogę zainstalować każdy .dll z menedżerem pakietów NuGet w visual studio. Ale z DSOfile.dll nie można zainstalować tego z menadżerem. – Desutoroiya
Niestety nie jestem tego świadomy. Dziękujemy za wyjaśnienie – CarbineCoder