/// <summary>
/// Returns the native known folder (IKnownFolderNative) given a PID list
/// </summary>
/// <param name="pidl"></param>
/// <returns></returns>
internal static IKnownFolderNative FromPIDL(IntPtr pidl)
{
KnownFolderManagerClass knownFolderManager = new KnownFolderManagerClass();
IKnownFolderNative knownFolder;
HResult hr = knownFolderManager.FindFolderFromIDList(pidl, out knownFolder);
return((hr == HResult.Ok) ? knownFolder : null);
}
private static ReadOnlyCollection <IKnownFolder> GetAllFolders()
{
// Should this method be thread-safe?? (It'll take a while
// to get a list of all the known folders, create the managed wrapper
// and return the read-only collection.
IList <IKnownFolder> foldersList = new List <IKnownFolder>();
uint count;
IntPtr folders = IntPtr.Zero;
try
{
KnownFolderManagerClass knownFolderManager = new KnownFolderManagerClass();
knownFolderManager.GetFolderIds(out folders, out count);
if (count > 0 && folders != IntPtr.Zero)
{
// Loop through all the KnownFolderID elements
for (int i = 0; i < count; i++)
{
// Read the current pointer
IntPtr current = new IntPtr(folders.ToInt64() + (Marshal.SizeOf(typeof(Guid)) * i));
// Convert to Guid
Guid knownFolderID = (Guid)Marshal.PtrToStructure(current, typeof(Guid));
IKnownFolder kf = KnownFolderHelper.FromKnownFolderIdInternal(knownFolderID);
// Add to our collection if it's not null (some folders might not exist on the system
// or we could have an exception that resulted in the null return from above method call
if (kf != null)
{
foldersList.Add(kf);
}
}
}
}
finally
{
if (folders != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(folders);
}
}
return(new ReadOnlyCollection <IKnownFolder>(foldersList));
}
/// <summary>
/// Returns a known folder given a globally unique identifier.
/// </summary>
/// <param name="knownFolderId">A GUID for the requested known folder.</param>
/// <returns>A known folder representing the specified name.</returns>
/// <exception cref="System.ArgumentException">Thrown if the given Known Folder ID is invalid.</exception>
public static IKnownFolder FromKnownFolderId(Guid knownFolderId)
{
IKnownFolderNative knownFolderNative;
KnownFolderManagerClass knownFolderManager = new KnownFolderManagerClass();
HResult hr = knownFolderManager.GetFolder(knownFolderId, out knownFolderNative);
if (hr != HResult.Ok)
{
throw new ShellException(hr);
}
IKnownFolder kf = GetKnownFolder(knownFolderNative);
if (kf == null)
{
throw new ArgumentException(LocalizedMessages.KnownFolderInvalidGuid, "knownFolderId");
}
return(kf);
}