// Make the DNC connection
private void Connect()
{
//Text = "VC# Example - Connected to " + ConnectionList.Text;
// Create the Automatic object and connect the OnProgramStateChanged event handler
m_automatic = (HeidenhainDNCLib.JHAutomatic)m_machine.GetInterface(HeidenhainDNCLib.DNC_INTERFACE_OBJECT.DNC_INTERFACE_JHAUTOMATIC);
// Hook up the OnProgramStateChanged event handler to the OnProgramStatusChanged event
//((HeidenhainDNCLib._IJHAutomaticEvents3_Event)m_automatic).OnProgramStatusChanged +=
//((HeidenhainDNCLib._IJHAutomaticEvents2_Event)m_automatic).OnProgramStatusChanged +=
//new HeidenhainDNCLib._IJHAutomaticEvents_OnProgramStatusChangedEventHandler(OnCOMProgramStateChanged);
#if NOTUSED
((HeidenhainDNCLib._IJHAutomaticEvents3_Event)m_automatic).OnDncModeChanged +=
new HeidenhainDNCLib._IJHAutomaticEvents_OnDncModeChangedEventHandler(OnCOMDncModeChanged);
((HeidenhainDNCLib._IJHAutomaticEvents3_Event)m_automatic).OnToolChanged +=
new HeidenhainDNCLib._IJHAutomaticEvents2_OnToolChangedEventHandler(OnCOMToolChanged);
((HeidenhainDNCLib._IJHAutomaticEvents3_Event)m_automatic).OnProgramChanged +=
new HeidenhainDNCLib._IJHAutomaticEvents2_OnProgramChangedEventHandler(OnCOMProgramChanged);
((HeidenhainDNCLib._IJHAutomaticEvents3_Event)m_automatic).OnExecutionMessage +=
new HeidenhainDNCLib._IJHAutomaticEvents2_OnExecutionMessageEventHandler(OnCOMExecutionMessage);
#endif
// Get the initial program status.
m_programState = m_automatic.GetProgramStatus();
}
// Break the DNC connection
private void Disconnect()
{
/* MSDN: How to: Handle Events Raised by a COM Source
* Note that COM objects that raise events within a .NET client require two Garbage Collector (GC) collections before they are released.
* This is caused by the reference cycle that occurs between COM objects and managed clients.
* If you need to explicitly release a COM object you should call the Collect method twice.
*
* This is important for COM events that pass COM objects as arguments, s.a. JHError::OnError2.
* If the argument was not explicitly released, it will hold a reference to the parent JHError object, thus preventing a successful Disconnect().
*/
System.GC.Collect();
System.GC.Collect();
if (m_automatic != null)
{
#if NOTUSED
// Unhook the OnCOMProgramStateChanged event handler from the OnProgramStatusChanged event
//((HeidenhainDNCLib._IJHAutomaticEvents3_Event)m_automatic).OnProgramStatusChanged -=
((HeidenhainDNCLib._IJHAutomaticEvents2_Event)m_automatic).OnProgramStatusChanged -=
new HeidenhainDNCLib._IJHAutomaticEvents_OnProgramStatusChangedEventHandler(OnCOMProgramStateChanged);
((HeidenhainDNCLib._IJHAutomaticEvents3_Event)m_automatic).OnToolChanged -=
new HeidenhainDNCLib._IJHAutomaticEvents2_OnToolChangedEventHandler(OnCOMToolChanged);
((HeidenhainDNCLib._IJHAutomaticEvents3_Event)m_automatic).OnDncModeChanged -=
new HeidenhainDNCLib._IJHAutomaticEvents_OnDncModeChangedEventHandler(OnCOMDncModeChanged);
((HeidenhainDNCLib._IJHAutomaticEvents3_Event)m_automatic).OnProgramChanged -=
new HeidenhainDNCLib._IJHAutomaticEvents2_OnProgramChangedEventHandler(OnCOMProgramChanged);
((HeidenhainDNCLib._IJHAutomaticEvents3_Event)m_automatic).OnExecutionMessage -=
new HeidenhainDNCLib._IJHAutomaticEvents2_OnExecutionMessageEventHandler(OnCOMExecutionMessage);
#endif
// Explicitly release the JHAutomatic COM object, to allow a successful disconnect.
System.Runtime.InteropServices.Marshal.ReleaseComObject(m_automatic);
m_automatic = null;
}
try
{
m_machine.Disconnect();
// Explicitly release the JHMachine COM object, to allow a successful new connection.
System.Runtime.InteropServices.Marshal.ReleaseComObject(m_machine);
m_machine = null;
}
catch (Exception)
{
// Ignore errors
}
}
