/// <summary>
/// Start shell watcher.
/// </summary>
public void Start()
{
if (this.Running)
{
return;
}
var entry = new SHChangeNotifyEntry
{
fRecursive = this.recursive,
pidl = this.shellObject.ShellItem.PIDL
};
const Int32 flags = SHCNRF.SHCNRF_ShellLevel |
SHCNRF.SHCNRF_InterruptLevel |
SHCNRF.SHCNRF_NewDelivery;
this.registrationId = ShellWatcherNativeMethods.SHChangeNotifyRegister(
this.ListenerWindow.Handle,
flags,
this.eventManager.RegisteredTypes,
this.Message,
1,
ref entry);
if (this.registrationId == 0)
{
throw new Win32Exception(ErrorMessages.ShellWatcherRegisterFailed);
}
this.Running = true;
}
/// <summary>
/// Stop shell watcher.
/// </summary>
public void Stop()
{
if (!this.Running)
{
return;
}
if (this.registrationId > 0)
{
ShellWatcherNativeMethods.SHChangeNotifyDeregister(this.registrationId);
this.registrationId = 0;
}
}
/// <summary>
/// Initialize a instance of the <see cref="ShellChangeNotify"/> class.
/// </summary>
/// <param name="wParam"><c>WPARAM</c>.</param>
/// <param name="lParam"><c>LPARAM</c>.</param>
internal ShellChangeNotify(IntPtr wParam, IntPtr lParam)
{
var hwnd = wParam;
var processId = (UInt32)lParam.ToInt64();
IntPtr pidl;
uint lEvent;
var lockId = ShellWatcherNativeMethods.SHChangeNotification_Lock(hwnd, processId, out pidl, out lEvent);
try
{
this.ChangeType = (ShellChangeTypes)lEvent;
var notifyStruct = (ShellNotifyStruct)Marshal.PtrToStructure(pidl, typeof(ShellNotifyStruct));
var guid = new Guid(ShellIID.IShellItem2);
// dwItem1
if (notifyStruct.item1 != IntPtr.Zero &&
(this.ChangeType & ShellChangeTypes.SystemImageUpdate) == ShellChangeTypes.None)
{
var shellObject = CreateShellObject(notifyStruct.item1, ref guid);
if (shellObject != null)
{
this.ShellObject = shellObject;
}
}
else
{
ImageIndex = notifyStruct.item1.ToInt32();
}
// dwItem2
if (notifyStruct.item2 != IntPtr.Zero)
{
var shellObject = CreateShellObject(notifyStruct.item2, ref guid);
if (shellObject != null)
{
this.ShellObject2 = shellObject;
}
}
}
finally
{
if (lockId != IntPtr.Zero)
{
ShellWatcherNativeMethods.SHChangeNotification_Unlock(lockId);
}
}
}
