Exception thrown in C# Generic HID

[mihooper]

Joe (et al),

I am getting an exception in the Generic HID code. System.ObjectDisposedException was unhandled
 

Code: [Select]

  private void cmdOnce_Click( System.Object eventSender, System.EventArgs eventArgs )
        {             
            try
            {
                //  Don't allow another transfer request until this one completes.
                //  Move the focus away from cmdOnce to prevent the focus from
                //  switching to the next control in the tab order on disabling the button.
               
                fraSendAndReceive.Focus();
                cmdOnce.Enabled = false;
               
                ReadAndWriteToDevice();                 
            }
            catch ( Exception ex )
            {
                DisplayException( this.Name, ex );
                throw ;
            }
        }       
The exception details are as follows:

System.ObjectDisposedException was unhandled
  Message=Safe handle has been closed
  Source=mscorlib
  ObjectName=""
  StackTrace:
       at System.StubHelpers.StubHelpers.SafeHandleC2NHelper(Object pThis, IntPtr pCleanupWorkList)
       at GenericHid.Hid.HidD_GetInputReport(SafeFileHandle HidDeviceObject, Byte[] lpReportBuffer, Int32 ReportBufferLength)
       at GenericHid.Hid.GetInputReportViaControlTransfer(SafeFileHandle hidHandle, Byte[]& inputReportBuffer) in C:\Users\Mike\Documents\Visual Studio 2010\Projects\generic_hid_cs\Hid.cs:line 308
       at GenericHid.FrmMain.ExchangeInputAndOutputReports() in C:\Users\Mike\Documents\Visual Studio 2010\Projects\generic_hid_cs\FrmMain.cs:line 1390
       at GenericHid.FrmMain.ReadAndWriteToDevice() in C:\Users\Mike\Documents\Visual Studio 2010\Projects\generic_hid_cs\FrmMain.cs:line 1730
       at GenericHid.FrmMain.cmdOnce_Click(Object eventSender, EventArgs eventArgs) in C:\Users\Mike\Documents\Visual Studio 2010\Projects\generic_hid_cs\FrmMain.cs:line 1037
       at System.Windows.Forms.Control.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ButtonBase.WndProc(Message& m)
       at System.Windows.Forms.Button.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at GenericHid.FrmMain.Main() in C:\Users\Mike\Documents\Visual Studio 2010\Projects\generic_hid_cs\FrmMain.cs:line 1942
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException:

I'm sure it is due to my client not responding properly, but for robustness I would like to fix this. Any ideas?

Thx,
MikeH

[Jan Axelson]

I don't know the answer but a web search on the error message turns up some discussions that might be helpful.

For example

http://stackoverflow.com/questions/290583/what-is-causing-objectdisposedexception-from-serialport-while-debugging-net-win

Jan