/// <summary>
/// Gets a <see cref="PropertyDescriptionList"/> from the specified <see cref="PropertyKey"/>
/// </summary>
/// <param name="key">The property list being requested</param>
/// <returns>The list of property descriptions specified by the property key</returns>
public PropertyDescriptionList GetPropertyDescriptionList(PropertyKey key)
{
IntPtr pUnk;
_pItem.GetPropertyDescriptionList(key.MarshalledPointer, IID.IProperyDescriptionList, out pUnk);
PropertyDescriptionList list = new PropertyDescriptionList(pUnk);
Marshal.Release(pUnk);
return(list);
}
/// <summary>
/// Creates a <see cref="PropertyDescriptionList"/> based on properties defined for a particular file or file type.
/// </summary>
/// <param name="path">The path or extension of the file type you want the PropertyDescriptionList for</param>
/// <param name="propListKey">This <see cref="PropertyKey"/> defines the usage of the properties defined in the PropertyDescriptionList. It will be one of the
/// <a href="https://msdn.microsoft.com/en-us/library/windows/desktop/ff521713(v=vs.85).aspx">PropList</a> values</param>
public PropertyDescriptionList(string path, PropertyKey propListKey)
{
IShellItem2 item = null;
FakeFile file = null;
if (File.Exists(path))
{
IntPtr itemUnk;
IntPtr pidl = ILCreateFromPath(Path.GetFullPath(path));
SHCreateItemFromIDList(pidl, IID.IShellItem2, out itemUnk);
item = (IShellItem2)Marshal.GetUniqueObjectForIUnknown(itemUnk);
Marshal.Release(itemUnk);
Marshal.FreeCoTaskMem(pidl);
}
else
{
string name;
path = path.Substring(path.LastIndexOf('\\') + 1);
if (path[0] == '.' || !(path.Contains('.')))
{
name = Path.ChangeExtension("_fakeFile", path);
}
else
{
name = Path.GetFileName(path);
}
WIN32_FIND_DATA fd = new WIN32_FIND_DATA()
{
dwFileAttributes = FileAttributes.Normal, nFileSizeLow = 42
};
file = new FakeFile(ref fd, name);
item = (IShellItem2)file.GetShellItem();
}
try {
IntPtr ppUnk = IntPtr.Zero;;
item.GetPropertyDescriptionList(propListKey.MarshalledPointer, IID.IProperyDescriptionList, out ppUnk);
_propList = (IPropertyDescriptionList)Marshal.GetUniqueObjectForIUnknown(ppUnk);
Marshal.Release(ppUnk);
}
finally {
if (item != null)
{
Marshal.FinalReleaseComObject(item);
}
if (file != null)
{
file.Dispose();
}
}
}
public static T GetPropertyDescriptionList <T>(this IShellItem2 psi, PROPERTYKEY keyType) where T : class
{
return((T)psi.GetPropertyDescriptionList(ref keyType, typeof(T).GUID));
}
