private void Enumerate()
{
IntPtr hEnum = IntPtr.Zero;
Files.Clear();
try
{
if (ShellFolderInterface?.EnumObjects(_hwndInput, SHCONTF.FOLDERS | SHCONTF.NONFOLDERS,
out hEnum) == NativeMethods.S_OK)
{
try
{
IEnumIDList enumIdList =
(IEnumIDList)Marshal.GetTypedObjectForIUnknown(hEnum, typeof(IEnumIDList));
while (enumIdList.Next(1, out var pidlChild, out var numFetched) == NativeMethods.S_OK && numFetched == 1)
{
if (_isDisposed)
{
break;
}
AddFile(pidlChild);
}
Marshal.FinalReleaseComObject(enumIdList);
}
catch (Exception e)
{
ShellLogger.Error($"ShellFolder: Exception while enumerating IShellFolder: {e.Message}");
}
finally
{
Marshal.Release(hEnum);
}
}
else
{
ShellLogger.Error($"ShellFolder: Unable to enumerate IShellFolder");
}
}
catch (Exception e)
{
ShellLogger.Error($"ShellFolder: Unable to enumerate IShellFolder: {e.Message}");
}
}
/// <summary>
/// Gets the children.
/// </summary>
/// <param name="childTypes">The child types.</param>
/// <returns>
/// The children.
/// </returns>
public IEnumerable <ShellItem> GetChildren(ChildTypes childTypes)
{
// We'll return a list of children.
var children = new List <ShellItem>();
// Create the enum flags from the childtypes.
SHCONTF enumFlags = 0;
if (childTypes.HasFlag(ChildTypes.Folders))
{
enumFlags |= SHCONTF.SHCONTF_FOLDERS;
}
if (childTypes.HasFlag(ChildTypes.Files))
{
enumFlags |= SHCONTF.SHCONTF_NONFOLDERS;
}
if (childTypes.HasFlag(ChildTypes.Hidden))
{
enumFlags |= SHCONTF.SHCONTF_INCLUDEHIDDEN;
}
try
{
// Create an enumerator for the children.
IEnumIDList pEnum;
var result = ShellFolderInterface.EnumObjects(IntPtr.Zero, enumFlags, out pEnum);
// Validate the result.
if (result != 0)
{
// Throw the failure as an exception.
Marshal.ThrowExceptionForHR((int)result);
}
// TODO: This logic should go in the pidl manager.
// Enumerate the children, ten at a time.
const int batchSize = 10;
var pidlArray = Marshal.AllocCoTaskMem(IntPtr.Size * 10);
uint itemsFetched;
result = WinError.S_OK;
do
{
result = pEnum.Next(batchSize, pidlArray, out itemsFetched);
// Get each pidl.
var pidls = new IntPtr[itemsFetched];
Marshal.Copy(pidlArray, pidls, 0, (int)itemsFetched);
foreach (var childPidl in pidls)
{
// Create a new shell folder.
var childShellFolder = new ShellItem();
// Initialize it.
try
{
childShellFolder.Initialise(childPidl, this);
}
catch (Exception exception)
{
throw new InvalidOperationException("Failed to initialise child.", exception);
}
// Add the child.
children.Add(childShellFolder);
// Free the PIDL, reset the result.
Marshal.FreeCoTaskMem(childPidl);
}
} while (result == WinError.S_OK);
Marshal.FreeCoTaskMem(pidlArray);
// Release the enumerator.
if (Marshal.IsComObject(pEnum))
{
Marshal.ReleaseComObject(pEnum);
}
}
catch (Exception exception)
{
throw new InvalidOperationException("Failed to enumerate children.", exception);
}
// Sort the children.
var sortedChildren = children.Where(c => c.IsFolder).ToList();
sortedChildren.AddRange(children.Where(c => !c.IsFolder));
// Return the children.
return(sortedChildren);
}
/// <summary>
/// Gets the children.
/// </summary>
/// <param name="childTypes">The child types.</param>
/// <returns>
/// The children.
/// </returns>
public IEnumerable <ShellItem> GetChildren(ChildTypes childTypes)
{
// We'll return a list of children.
var children = new List <ShellItem>();
// Create the enum flags from the childtypes.
SHCONTF enumFlags = SHCONTF.None;
if (childTypes.HasFlag(ChildTypes.Folders))
{
enumFlags |= SHCONTF.SHCONTF_FOLDERS;
}
if (childTypes.HasFlag(ChildTypes.Files))
{
enumFlags |= SHCONTF.SHCONTF_NONFOLDERS;
}
if (childTypes.HasFlag(ChildTypes.Hidden))
{
enumFlags |= SHCONTF.SHCONTF_INCLUDEHIDDEN;
}
try
{
// Create an enumerator for the children.
IEnumIDList pEnum;
var result = ShellFolderInterface.EnumObjects(IntPtr.Zero, enumFlags, out pEnum);
// Validate the result.
if (result != 0)
{
// Throw the failure as an exception.
Marshal.ThrowExceptionForHR((int)result);
}
// Start going through children.
IntPtr childPIDL;
int enumResult;
pEnum.Next(1, out childPIDL, out enumResult);
// Now start enumerating.
while (childPIDL != IntPtr.Zero && enumResult == 1)
{
// Create a new shell folder.
var childShellFolder = new ShellItem();
// Initialize it.
try
{
childShellFolder.Initialise(childPIDL, this);
}
catch (Exception exception)
{
throw new InvalidOperationException("Failed to initialise child.", exception);
}
// Add the child.
children.Add(childShellFolder);
// Free the PIDL, reset the result.
Marshal.FreeCoTaskMem(childPIDL);
// Move onwards.
pEnum.Next(1, out childPIDL, out enumResult);
}
// Release the enumerator.
Marshal.ReleaseComObject(pEnum);
}
catch (Exception exception)
{
throw new InvalidOperationException("Failed to enumerate children.", exception);
}
// Sort the children.
var sortedChildren = children.Where(c => c.IsFolder).ToList();
sortedChildren.AddRange(children.Where(c => !c.IsFolder));
// Return the children.
return(sortedChildren);
}