private void ProcessNotification(ResizableBuffer resizableBuffer)
{
IntPtr bufferPointer = resizableBuffer.DangerousGetPointer();
// Marshal the notification received.
DriverNotificationHeader header = (DriverNotificationHeader)Marshal.PtrToStructure(bufferPointer, typeof(DriverNotificationHeader));
DriverNotification notification = new DriverNotification { Type = header.Type, DataLength = header.DataLength, Data = bufferPointer + this.notificationHeaderSize };
// Get the reply object from the user-defined handler.
object reply = null;
int handlerResult = (int)NativeMethods.Ok;
try
{
reply = this.handler(notification);
}
catch (Exception e)
{
handlerResult = Marshal.GetHRForException(e);
NotificationsMonitor.Logger.Error(e, "Notification handler threw an exception.");
}
// Driver is not expecting any reply.
if (header.ReplyLength == 0)
{
if (reply != null)
{
NotificationsMonitor.Logger.Warn(CultureInfo.InvariantCulture, "Driver is not expecting any reply, but reply object is returned from handler: {0}", reply.GetType());
}
return;
}
int replySize = this.replyHeaderSize + MarshalingHelper.GetObjectSize(reply);
if (replySize > header.ReplyLength)
{
throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, "Reply ({0} bytes) is bigger than the one expected by the driver ({1} bytes).", replySize, header.ReplyLength));
}
DriverReplyHeader replyHeader = new DriverReplyHeader
{
MessageId = header.MessageId,
// Notify driver about the exception thrown, if any.
Status = handlerResult
};
// Adjust the buffer to fit the reply.
resizableBuffer.Resize(replySize);
bufferPointer = resizableBuffer.DangerousGetPointer();
// Marshal reply to the output buffer.
MarshalingHelper.MarshalObjectsToPointer(bufferPointer, replySize, replyHeader, reply);
// And send it to the driver.
uint hr = NativeMethods.FilterReplyMessage(this.filterPortHandle, bufferPointer, (uint)replySize);
if (hr != NativeMethods.Ok)
{
throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, "Unable to send reply: 0x{0:X8}", hr), Marshal.GetExceptionForHR(unchecked((int)hr)));
}
}
private void ProcessNotification(ResizableBuffer resizableBuffer)
{
IntPtr bufferPointer = resizableBuffer.DangerousGetPointer();
// Marshal the notification received.
DriverNotificationHeader header = (DriverNotificationHeader)Marshal.PtrToStructure(bufferPointer, typeof(DriverNotificationHeader));
DriverNotification notification = new DriverNotification {
Type = header.Type, DataLength = header.DataLength, Data = bufferPointer + this.notificationHeaderSize
};
// Get the reply object from the user-defined handler.
object reply = null;
int handlerResult = (int)NativeMethods.Ok;
try
{
reply = this.handler(notification);
}
catch (Exception e)
{
handlerResult = Marshal.GetHRForException(e);
NotificationsMonitor.Logger.Error(e, "Notification handler threw an exception.");
}
// Driver is not expecting any reply.
if (header.ReplyLength == 0)
{
if (reply != null)
{
NotificationsMonitor.Logger.Warn(CultureInfo.InvariantCulture, "Driver is not expecting any reply, but reply object is returned from handler: {0}", reply.GetType());
}
return;
}
int replySize = this.replyHeaderSize + MarshalingHelper.GetObjectSize(reply);
if (replySize > header.ReplyLength)
{
throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, "Reply ({0} bytes) is bigger than the one expected by the driver ({1} bytes).", replySize, header.ReplyLength));
}
DriverReplyHeader replyHeader = new DriverReplyHeader
{
MessageId = header.MessageId,
// Notify driver about the exception thrown, if any.
Status = handlerResult
};
// Adjust the buffer to fit the reply.
resizableBuffer.Resize(replySize);
bufferPointer = resizableBuffer.DangerousGetPointer();
// Marshal reply to the output buffer.
MarshalingHelper.MarshalObjectsToPointer(bufferPointer, replySize, replyHeader, reply);
// And send it to the driver.
uint hr = NativeMethods.FilterReplyMessage(this.filterPortHandle, bufferPointer, (uint)replySize);
if (hr != NativeMethods.Ok)
{
throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, "Unable to send reply: 0x{0:X8}", hr), Marshal.GetExceptionForHR(unchecked ((int)hr)));
}
}
