/// <summary>
/// Create a new point-to-point message queue object.
/// </summary>
/// <param name="name">
/// Indicates the name of a named queue. Set to null to create
/// an unnamed queue.
/// </param>
/// <param name="maxMessages">
/// Indicates the length of the queue in messages.
/// </param>
/// <param name="maxMessageSize">
/// Indicates the maximum size of each message in the queue.
/// </param>
/// <param name="readAccess">
/// Set to true if messages will be read from the queue, false
/// if messages will be written to the queue. A read/write
/// queue cannot be created.
/// </param>
/// <param name="flags">
/// Flags indicating how the queue will operate.
/// </param>
public PointToPointMsgQueue( string name,
int maxMessages, int maxMessageSize,
bool readAccess, PointToPointMsgQueueFlags flags )
{
hMsgQueue = IntPtr.Zero;
created = false;
// Set up the descriptor for the queue, based on the
// parameters.
MSGQUEUEOPTIONS opt = new MSGQUEUEOPTIONS();
opt.dwFlags = (int)flags;
opt.dwMaxMessages = maxMessages;
opt.cbMaxMessage = maxMessageSize;
opt.bReadAccess = ( readAccess ? 1 : 0 );
// Actually create the queue.
hMsgQueue = PointToPointMsgQueuePInvokes.CreateMsgQueue( name, opt );
if ( hMsgQueue != IntPtr.Zero )
{
// Get indication of whether we created the queue or
// if we just attached to an existing queue.
uint err = PointToPointMsgQueuePInvokes.GetLastError();
if ( err == 0 )
{
created = true;
}
else
{
created = false;
}
}
}
/// <summary>
/// Create a new point-to-point message queue object.
/// </summary>
/// <param name="name">
/// Indicates the name of a named queue. Set to null to create
/// an unnamed queue.
/// </param>
/// <param name="maxMessages">
/// Indicates the length of the queue in messages.
/// </param>
/// <param name="maxMessageSize">
/// Indicates the maximum size of each message in the queue.
/// </param>
/// <param name="readAccess">
/// Set to true if messages will be read from the queue, false
/// if messages will be written to the queue. A read/write
/// queue cannot be created.
/// </param>
/// <param name="flags">
/// Flags indicating how the queue will operate.
/// </param>
public PointToPointMsgQueue(string name,
int maxMessages, int maxMessageSize,
bool readAccess, PointToPointMsgQueueFlags flags)
{
hMsgQueue = IntPtr.Zero;
created = false;
// Set up the descriptor for the queue, based on the
// parameters.
MSGQUEUEOPTIONS opt = new MSGQUEUEOPTIONS();
opt.dwFlags = (int)flags;
opt.dwMaxMessages = maxMessages;
opt.cbMaxMessage = maxMessageSize;
opt.bReadAccess = (readAccess ? 1 : 0);
// Actually create the queue.
hMsgQueue = PointToPointMsgQueuePInvokes.CreateMsgQueue(name, opt);
if (hMsgQueue != IntPtr.Zero)
{
// Get indication of whether we created the queue or
// if we just attached to an existing queue.
uint err = PointToPointMsgQueuePInvokes.GetLastError();
if (err == 0)
{
created = true;
}
else
{
created = false;
}
}
}
/// <summary>
/// Write a new item to the message queue.
/// </summary>
/// <param name="buffer">
/// Caller-allocated byte array for the data.
/// </param>
/// <param name="bufferSize">
/// Number of bytes in the caller-allocated buffer.
/// </param>
/// <param name="timeout">
/// Time-out value in ms for the read. If no messages arrive
/// before the time-out occurs, the number of bytes read will
/// be zero.
/// </param>
/// <param name="writeFlags">
/// Can be set to AlertMsg, if an 'alert message' is to be posted
/// to the queue. Otherwise, set to zero.
/// </param>
/// <returns>
/// True is returned on a successful write; false otherwise.
/// </returns>
public bool WriteMsgQueue(byte[] buffer, int bufferSize,
int timeout, PointToPointMsgQueueFlags writeFlags)
{
bool result = PointToPointMsgQueuePInvokes.WriteMsgQueue(
hMsgQueue, buffer, bufferSize,
timeout, (int)writeFlags);
// Check the result and throw exceptions on errors.
// ????
return(result);
}
internal void StatusThread()
{
// Ask the system to notify our message queue when devices of
// the indicated class are added or removed.
IntPtr h = RequestDeviceNotifications(
devClass.ToGuid().ToByteArray(),
mq.Handle, fAll);
// Wait for the queue to be signaled. When it is, decode
// the message and call any listeners for it. If the
// queue closes suddenly, that's our cue to exit, shutting
// down notifications before we leave.
PointToPointMsgQueue q = mq;
while (mq != null) // Check the global object here.
{
// Wait. On return, true indicates that the queue is
// signaled; false is a chance to check whether we should
// exit.
if (q.Wait(-1))
{
// Read the event data.
int bytes = 0;
PointToPointMsgQueueFlags readFlags = 0;
DEVDETAIL devDetail = new DEVDETAIL();
if (q.ReadMsgQueue(devDetail.getBytes(),
DEVDETAIL.MAX_DEVDETAIL_SIZE,
ref bytes, -1, ref readFlags))
{
// Handle the event.
OnDeviceNotification(new DeviceNotificationArgs(
devDetail.guidDevClass, devDetail.fAttached,
devDetail.szName));
}
}
else
{
System.Diagnostics.Debug.WriteLine(this, "mq is null in monitoring thread. Exiting...");
}
}
System.Diagnostics.Debug.WriteLine(this, "exiting DeviceStatusMonitor thread.");
// Stop notifications to us.
StopDeviceNotifications(h);
}
/// <summary>
/// Read the next item from the message queue.
/// </summary>
/// <param name="buffer">
/// Caller-allocated byte array for the data.
/// </param>
/// <param name="bufferSize">
/// Number of bytes in the caller-allocated buffer.
/// </param>
/// <param name="bytesRead">
/// Return value indicating number of bytes actually read and
/// stored in the buffer.
/// </param>
/// <param name="timeout">
/// Time-out value in ms for the read. If no messages arrive
/// before the time-out occurs, the number of bytes read will
/// be zero.
/// </param>
/// <param name="readFlags">
/// Will be set to AlertMsg if the message was written to the
/// queue with that flag set. Zero, otherwise.
/// </param>
/// <returns>
/// True is returned on a successful read; false otherwise.
/// </returns>
public bool ReadMsgQueue(byte[] buffer, int bufferSize,
ref int bytesRead, int timeout,
ref PointToPointMsgQueueFlags readFlags)
{
int fl = 0;
bool result = PointToPointMsgQueuePInvokes.ReadMsgQueue(
hMsgQueue,
buffer, bufferSize, ref bytesRead, timeout,
ref fl);
readFlags = (PointToPointMsgQueueFlags)fl;
// Check the result and throw exceptions on errors.
// ????
return(result);
}
/// <summary>
/// Write a new item to the message queue.
/// </summary>
/// <param name="buffer">
/// Caller-allocated byte array for the data.
/// </param>
/// <param name="bufferSize">
/// Number of bytes in the caller-allocated buffer.
/// </param>
/// <param name="timeout">
/// Time-out value in ms for the read. If no messages arrive
/// before the time-out occurs, the number of bytes read will
/// be zero.
/// </param>
/// <param name="writeFlags">
/// Can be set to AlertMsg, if an 'alert message' is to be posted
/// to the queue. Otherwise, set to zero.
/// </param>
/// <returns>
/// True is returned on a successful write; false otherwise.
/// </returns>
public bool WriteMsgQueue( byte[] buffer, int bufferSize,
int timeout, PointToPointMsgQueueFlags writeFlags )
{
bool result = PointToPointMsgQueuePInvokes.WriteMsgQueue(
hMsgQueue, buffer, bufferSize,
timeout, (int)writeFlags );
// Check the result and throw exceptions on errors.
// ????
return result;
}
/// <summary>
/// Read the next item from the message queue.
/// </summary>
/// <param name="buffer">
/// Caller-allocated byte array for the data.
/// </param>
/// <param name="bufferSize">
/// Number of bytes in the caller-allocated buffer.
/// </param>
/// <param name="bytesRead">
/// Return value indicating number of bytes actually read and
/// stored in the buffer.
/// </param>
/// <param name="timeout">
/// Time-out value in ms for the read. If no messages arrive
/// before the time-out occurs, the number of bytes read will
/// be zero.
/// </param>
/// <param name="readFlags">
/// Will be set to AlertMsg if the message was written to the
/// queue with that flag set. Zero, otherwise.
/// </param>
/// <returns>
/// True is returned on a successful read; false otherwise.
/// </returns>
public bool ReadMsgQueue( byte[] buffer, int bufferSize,
ref int bytesRead, int timeout,
ref PointToPointMsgQueueFlags readFlags )
{
int fl = 0;
bool result = PointToPointMsgQueuePInvokes.ReadMsgQueue(
hMsgQueue,
buffer, bufferSize, ref bytesRead, timeout,
ref fl );
readFlags = (PointToPointMsgQueueFlags)fl;
// Check the result and throw exceptions on errors.
// ????
return result;
}
internal void StatusThread()
{
// Ask NDISUIO to send us notification messages for our
// adapter.
IntPtr ndisAccess = FileEx.CreateFile(
NDISUIOPInvokes.NDISUIO_DEVICE_NAME,
FileAccess.All,
FileShare.None,
FileCreateDisposition.OpenExisting,
NDISUIOPInvokes.FILE_ATTRIBUTE_NORMAL | NDISUIOPInvokes.FILE_FLAG_OVERLAPPED);
if ((int)ndisAccess == FileEx.InvalidHandle)
{
return;
}
NDISUIO_REQUEST_NOTIFICATION ndisRequestNotification =
new NDISUIO_REQUEST_NOTIFICATION();
ndisRequestNotification.hMsgQueue = mq.Handle;
ndisRequestNotification.dwNotificationTypes =
NDISUIOPInvokes.NDISUIO_NOTIFICATION_MEDIA_SPECIFIC_NOTIFICATION |
NDISUIOPInvokes.NDISUIO_NOTIFICATION_MEDIA_CONNECT |
NDISUIOPInvokes.NDISUIO_NOTIFICATION_MEDIA_DISCONNECT |
NDISUIOPInvokes.NDISUIO_NOTIFICATION_BIND |
NDISUIOPInvokes.NDISUIO_NOTIFICATION_UNBIND;
UInt32 xcount = 0;
if (!NDISUIOPInvokes.DeviceIoControl(ndisAccess,
NDISUIOPInvokes.IOCTL_NDISUIO_REQUEST_NOTIFICATION,
ndisRequestNotification.getBytes(),
NDISUIO_REQUEST_NOTIFICATION.Size,
null, 0, ref xcount, IntPtr.Zero))
{
System.Diagnostics.Debug.WriteLine(this, "Error in DeviceIoControl to request notifications!");
}
// Each notification will be of this type.
NDISUIO_DEVICE_NOTIFICATION ndisDeviceNotification =
new NDISUIO_DEVICE_NOTIFICATION();
// Wait for the queue to be signaled. When it is, decode
// the message and call any listeners for it. If the
// queue closes suddenly, that's our cue to exit, shutting
// down NDISUIO notifications before we leave.
PointToPointMsgQueue q = mq;
while (mq != null) // Check the global object here.
{
// Wait. On return, true indicates that the queue is
// signaled; false is a chance to check whether we should
// exit.
if (q.Wait(-1))
{
// Read the event data.
int bytes = 0;
PointToPointMsgQueueFlags readFlags = 0;
if (q.ReadMsgQueue(ndisDeviceNotification.getBytes(),
NDISUIO_DEVICE_NOTIFICATION.Size,
ref bytes, -1, ref readFlags))
{
// Handle the event.
OnAdapterNotification(new AdapterNotificationArgs(
ndisDeviceNotification.ptcDeviceName,
(NdisNotificationType)ndisDeviceNotification.dwNotificationType));
}
}
else
{
System.Diagnostics.Debug.WriteLine(this, "mq is null in monitoring thread. Exiting...");
}
}
System.Diagnostics.Debug.WriteLine(this, "exiting AdapterStatusMonitor thread.");
if (!NDISUIOPInvokes.DeviceIoControl(ndisAccess,
NDISUIOPInvokes.IOCTL_NDISUIO_CANCEL_NOTIFICATION,
null, 0,
null, 0, ref xcount, IntPtr.Zero))
{
System.Diagnostics.Debug.WriteLine(this, "Error in DeviceIoControl to stop notifications!");
// ????
}
// Don't forget to close our handle to NDISUIO.
FileEx.CloseHandle(ndisAccess);
}
