old problem, revisited

hi everyone. i thought i fixed this problem but it keeps coming back. i have a usb modem connected to my computer (which can send and recieve sms's). my program's main thread is used to read/send sms's and store them in a db. a secondary thread polls the modem looking for new text messages (about once every 3 seconds). after running about an hour (sometimes sooner) the program gets disconnected from the commport (it use to crash the program but ive seemed to fix that) and wont reconnect. heres the relevant code:

Main Form:

Code:

---

.....
Delegate Sub TaskDelegate()
........
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        Try
            If IsConnected = False Then
                Me.Label12.Text = "Not Connected"
            Else
                Me.Label12.Text = "Connected"
            End If

            If NewMsg = True Then
                Me.Label10.Text = (CInt(Me.Label10.Text) + 1).ToString
                NewMsg = False
            Else

            End If


            Dim someClass As New Class2
            Dim td As New TaskDelegate(AddressOf someClass.FindMyPort)
            td.BeginInvoke(Nothing, Nothing)

        Catch ex As Exception
            MsgBox("An error has occured.  Please make sure the programs database is closed.")
        End Try
    End Sub

---

Class2 thread:

Code:

---


Public Class Class2
Delegate Sub TaskDelegate()

Public sub ShowMessage (ByRef MsgPDU As SmsDeliverPdu)
'not important because this is not called if no sms comes in, which they
'dont when i test it
end sub

    Public Sub FindMyPort()
        Dim storage = PhoneStorageType.Sim
        Dim MsgLocation As Integer
        Dim counter As Integer = 0
        Dim GetManu As String = ""

        Debug.Print("Start Class findmyport")
        Debug.Print(MyPortNumber)


        comm = New GsmCommMain(MyPortNumber, 9600)
        Dim nullCheck = IsDBNull(comm)
        If nullCheck = True Then
            Debug.Print("port is null")
        Else
            If comm.IsOpen = True Then
                comm.Close()
                Thread.CurrentThread.Abort()
                Exit Sub
            Else
                Try

                    comm.Open()
                    counter = 0
                    Try
                        IsConnected = True
                        Dim messages As DecodedShortMessage() = comm.ReadMessages(PhoneMessageStatus.ReceivedUnread, PhoneStorageType.Sim)
                        For Each DecodedShortMessage In messages
                            MsgLocation = DecodedShortMessage.Index
                            counter = counter + 1
                            Try
                                comm.DeleteMessage(MsgLocation, PhoneStorageType.Sim)
                            Catch ex As Exception
                                Debug.Print("error deleting from inbox")
                                Exit Sub
                            Finally
                                messages = Nothing
                            End Try
                            ShowMessage(DecodedShortMessage.Data)
                        Next
                    Catch ex As Exception
                        Debug.Print("error gettting inbox")
                        Exit Sub
                    End Try

                    If counter > 0 Then
                        NewMsg = True
                    End If

                Catch ex As GsmComm.GsmCommunication.CommException
                    IsConnected = False
                    Debug.Print("error:" & ex.InnerException.Message)

                    If comm.IsOpen = True Then
                        comm.Close()
                    End If
                  Finally
                    If comm.IsOpen = True Then
                        comm.Close()
                    End If
                End Try
            End If
        End If

        storage = Nothing
        GetManu = Nothing
        MsgLocation = Nothing
        counter = Nothing
        GC.Collect()
        Debug.Print("exiting sub")
    End Sub

end class

---

and here is the error i get after it runs for an hour or so:

A first chance exception of type 'GsmComm.GsmCommunication.CommException' occurred in GSMCommunication.dll
error:The process cannot access the port 'COM6' because it is being used by another process.

what could be using the port? i have no other application running that would use it. is it something to do with the thread? do i need to destroy the thread after its run? if so, how?
thanks
jason

Have you tried using netstat to determine what process is using that port?

Does the modem have some sort of a service running on the PC that could be using that port?

There's PortReporter to, which can help you determine this.

http://www.microsoft.com/downloads/d...displaylang=en

i'll give it a try. i dont think its the program on the modem as i have disabled it.

you know of anything that will work on vista?

nevermind i found something

Do share what you found. Did it solve your problem or point you in the right way?

i used ok,portmon.exe i found just on google. this is what i got. its alot of info. if it looks crappy let me know and i can email it in an excel file. the problems seems to be in the end. around the second or third to last line is where the program crashes. after the program closes it pops out the last two lines:

0.00064212 SMSer.exe IRP_MJ_WRITE QCUSB_COM6_3 SUCCESS Length 3: AT.
0.00002158 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00003080 SMSer.exe IOCTL_SERIAL_WAIT_ON_MASK QCUSB_COM6_3 SUCCESS
0.30577881 SMSer.exe IOCTL_SERIAL_WAIT_ON_MASK QCUSB_COM6_3 SUCCESS
0.00001306 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00001285 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00000684 SMSer.exe IRP_MJ_READ QCUSB_COM6_3 SUCCESS Length 6: ..OK..
0.00002696 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00002368 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00002710 SMSer.exe IOCTL_SERIAL_PURGE QCUSB_COM6_3 SUCCESS Purge: TXABORT TXCLEAR
0.00001886 SMSer.exe IOCTL_SERIAL_PURGE QCUSB_COM6_3 SUCCESS Purge: RXABORT RXCLEAR
0.00098078 SMSer.exe IRP_MJ_WRITE QCUSB_COM6_3 SUCCESS Length 13: AT+CPMS="SM".
0.00002731 SMSer.exe IOCTL_SERIAL_WAIT_ON_MASK QCUSB_COM6_3 SUCCESS
0.00002046 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00523453 SMSer.exe IOCTL_SERIAL_WAIT_ON_MASK QCUSB_COM6_3 SUCCESS
0.00002256 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00001187 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00000908 SMSer.exe IRP_MJ_READ QCUSB_COM6_3 SUCCESS Length 31: ..+CPMS: 2,40,2,40,2,40....OK..
0.00001578 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00001076 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00002535 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00002570 SMSer.exe IOCTL_SERIAL_PURGE QCUSB_COM6_3 SUCCESS Purge: TXABORT TXCLEAR
0.00001585 SMSer.exe IOCTL_SERIAL_PURGE QCUSB_COM6_3 SUCCESS Purge: RXABORT RXCLEAR
0.00120162 SMSer.exe IRP_MJ_WRITE QCUSB_COM6_3 SUCCESS Length 10: AT+CMGF=0.
0.00002389 SMSer.exe IOCTL_SERIAL_WAIT_ON_MASK QCUSB_COM6_3 SUCCESS
0.00001725 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00001208 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00001802 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00521624 SMSer.exe IOCTL_SERIAL_WAIT_ON_MASK QCUSB_COM6_3 SUCCESS
0.00000733 SMSer.exe IRP_MJ_READ QCUSB_COM6_3 SUCCESS Length 6: ..OK..
0.00001453 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00001055 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00002375 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00002018 SMSer.exe IOCTL_SERIAL_PURGE QCUSB_COM6_3 SUCCESS Purge: TXABORT TXCLEAR
0.00001390 SMSer.exe IOCTL_SERIAL_PURGE QCUSB_COM6_3 SUCCESS Purge: RXABORT RXCLEAR
0.00109309 SMSer.exe IRP_MJ_WRITE QCUSB_COM6_3 SUCCESS Length 10: AT+CMGL=0.
0.00002403 SMSer.exe IOCTL_SERIAL_WAIT_ON_MASK QCUSB_COM6_3 SUCCESS
0.00001746 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
22.78018631 SMSer.exe IOCTL_SERIAL_WAIT_ON_MASK QCUSB_COM6_3 CANCELLED
0.00001830 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00001124 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.00000754 SMSer.exe IRP_MJ_READ QCUSB_COM6_3 SUCCESS Length 6: ..OK..
0.00001481 SMSer.exe IOCTL_SERIAL_GET_COMMSTATUS QCUSB_COM6_3 SUCCESS
0.29966392 SMSer.exe IRP_MJ_READ QCUSB_COM6_3 TIMEOUT Length 0:
0.00000852 SMSer.exe IRP_MJ_CREATE QCUSB_COM6_3 SHARING VIOLATION Options: Open
0.00000747 SMSer.exe IRP_MJ_CREATE QCUSB_COM6_3 SHARING VIOLATION Options: Open
0.00000691 SMSer.exe IRP_MJ_CREATE QCUSB_COM6_3 SHARING VIOLATION Options: Open
0.00000796 SMSer.exe IRP_MJ_CREATE QCUSB_COM6_3 SHARING VIOLATION Options: Open
0.00000838 SMSer.exe IRP_MJ_CREATE QCUSB_COM6_3 SHARING VIOLATION Options: Open
0.00000719 SMSer.exe IRP_MJ_CREATE QCUSB_COM6_3 SHARING VIOLATION Options: Open
0.00000789 SMSer.exe IRP_MJ_CREATE QCUSB_COM6_3 SHARING VIOLATION Options: Open
0.01747094 SMSer.exe IRP_MJ_CLEANUP QCUSB_COM6_3 SUCCESS
0.00687979 SMSer.exe IRP_MJ_CLOSE QCUSB_COM6_3 SUCCESS

what could be causing the sharing violation? if im reading this right, no other app is trying to use it