public static CleanupHandler InitializeHandler(string VolumeCacheName, string TargetDriveLetter)
{
var evcProps = new CleanupHandler()
{
DefaultName = VolumeCacheName
};
using (var rKey = Registry.LocalMachine.OpenSubKey(VolumeCacheStoreKey + VolumeCacheName, false))
{
// StateFlags specify if a particular handler was used last time Disk Cleanup ran as Administrator
evcProps.StateFlag = (int)rKey.GetValue("StateFlags", 0) == 0 ? false : true;
evcProps.HandlerGuid = new Guid((string)rKey.GetValue(null));
object evcInstance;
// This is needed due to Data Driven Cleaner {C0E13E61-0CC6-11d1-BBB6-0060978B2AE6} always throwing E_NOTIMPLEMENTED on <= Windows 7
try { evcInstance = Activator.CreateInstance(Type.GetTypeFromCLSID(evcProps.HandlerGuid)); }
catch
{
//System.Windows.Forms.MessageBox.Show(evcProps.HandlerGuid.ToString(), "Failed to load provider");
return(null);
}
// Check if newer interface with InitializeEx is available
if (evcInstance is IEmptyVolumeCache2 ex2Instance)
{
int initRes = ex2Instance.InitializeEx(rKey.Handle.DangerousGetHandle(), TargetDriveLetter, VolumeCacheName, out IntPtr ppwszDisplayName, out IntPtr ppwszDescription, out IntPtr ppwszBtnText, out uint pdwFlags);
// Discard handler if initialization failed
if (initRes != 0)
{
try { ex2Instance.Deactivate(out uint dummy); } catch { }
Marshal.FinalReleaseComObject(ex2Instance);
return(null);
}
evcProps.DisplayName = Marshal.PtrToStringAuto(ppwszDisplayName);
evcProps.Description = Marshal.PtrToStringAuto(ppwszDescription);
evcProps.ButtonText = Marshal.PtrToStringAuto(ppwszBtnText);
evcProps.Flags = (HandlerFlags)pdwFlags;
evcProps.Instance = ex2Instance;
}
else
{
// It appears that only the old interface is available
IEmptyVolumeCache vcInstance = (IEmptyVolumeCache)evcInstance;
int initRes = vcInstance.Initialize(rKey.Handle.DangerousGetHandle(), TargetDriveLetter, out IntPtr ppwszDisplayName, out IntPtr ppwszDescription, out uint pdwFlags);
// Discard handler if initialization failed
if (initRes != 0)
{
try { vcInstance.Deactivate(out uint dummy); } catch { }
Marshal.FinalReleaseComObject(vcInstance);
return(null);
}
evcProps.DisplayName = Marshal.PtrToStringAuto(ppwszDisplayName);
evcProps.Description = Marshal.PtrToStringAuto(ppwszDescription);
evcProps.Flags = (HandlerFlags)pdwFlags;
evcProps.Instance = vcInstance;
}
evcProps.IconHint = rKey.GetValue("IconPath", null);
if (evcProps.IconHint == null)
{
// Icons can sometimes be provided by the DefaultIcon of a handler's class
RegistryKey hkrKey = Registry.ClassesRoot.OpenSubKey(string.Format("CLSID\\{{{0}}}\\DefaultIcon", evcProps.HandlerGuid));
if (hkrKey != null)
{
evcProps.IconHint = (string)hkrKey.GetValue(null);
hkrKey.Close();
}
}
evcProps.PreProcHint = (string)rKey.GetValue("PreCleanupString", null);
evcProps.PostProcHint = (string)rKey.GetValue("CleanupString", null);
#region Multi-Type registry value to uint loader
object optValObj = rKey.GetValue("Flags");
if (optValObj != null)
{
RegistryValueKind optValKind = rKey.GetValueKind("Flags");
uint optVal = 0;
switch (optValKind)
{
case RegistryValueKind.Binary:
optVal = BitConverter.ToUInt32((byte[])optValObj, 0);
break;
case RegistryValueKind.DWord:
optVal = (uint)(int)optValObj;
break;
}
if (optVal > 0)
{
evcProps.DataDrivenFlags = (DDCFlags)optVal;
}
}
optValObj = rKey.GetValue("Priority");
if (optValObj != null)
{
RegistryValueKind optValKind = rKey.GetValueKind("Priority");
uint optVal = 0;
switch (optValKind)
{
case RegistryValueKind.Binary:
optVal = BitConverter.ToUInt32((byte[])optValObj, 0);
break;
case RegistryValueKind.DWord:
optVal = (uint)(int)optValObj;
break;
}
if (optVal > 0)
{
evcProps.Priority = optVal;
}
}
#endregion
// Multiple paths strike again, we check if there's a Property Bag or PE resource contain strings in case we still have none loaded
if (evcProps.DisplayName == null)
{
string optionalValue = (string)rKey.GetValue("PropertyBag", null);
if (optionalValue != null)
{
IPropertyBag pbInstance = (IPropertyBag)Activator.CreateInstance(Type.GetTypeFromCLSID(new Guid(optionalValue)));
object bagContent = "";
if (pbInstance.Read("display", ref bagContent, IntPtr.Zero) == 0)
{
evcProps.DisplayName = (string)bagContent;
}
if (pbInstance.Read("Description", ref bagContent, IntPtr.Zero) == 0)
{
evcProps.Description = (string)bagContent;
}
if (pbInstance.Read("AdvancedButtonText", ref bagContent, IntPtr.Zero) == 0)
{
evcProps.ButtonText = (string)bagContent;
}
Marshal.FinalReleaseComObject(pbInstance);
return(evcProps);
}
optionalValue = (string)rKey.GetValue("display", null);
if (optionalValue != null)
{
StringBuilder strBld = new StringBuilder(513);
NativeMethods.SHLoadIndirectString(optionalValue, strBld, 513, IntPtr.Zero);
evcProps.DisplayName = strBld.ToString();
optionalValue = (string)rKey.GetValue("Description", null);
strBld.Clear();
NativeMethods.SHLoadIndirectString(optionalValue, strBld, 513, IntPtr.Zero);
evcProps.Description = strBld.ToString();
optionalValue = (string)rKey.GetValue("AdvancedButtonText", null);
strBld.Clear();
NativeMethods.SHLoadIndirectString(optionalValue, strBld, 513, IntPtr.Zero);
evcProps.ButtonText = strBld.ToString();
return(evcProps);
}
}
}
if (evcProps.DisplayName == null)
{
evcProps.DisplayName = VolumeCacheName;
}
return(evcProps);
}
public static void UpdateHandlerStateFlag(CleanupHandler cleanupHandler)
{
using (var rKey = Registry.LocalMachine.OpenSubKey(VolumeCacheStoreKey + cleanupHandler.DefaultName, true))
rKey.SetValue("StateFlags", cleanupHandler.StateFlag ? 1 : 0);
}