User-230561051 posted
Hi.
i have a Siemens TC35i Wireless Terminal. I have build a .net 2.0 application to send and recieve sms from. at first i had a connect / disconnect button and a send button + a textbox for writing commands in. this all worked fine, now i have to
do this automatically, eventually from a service, so i cant have any buttons for anything, the application have to know when to connect / disconnect. and here in lies my problem.
I use the Serialport class for communicating with my modem, and to my belief (correct me if im wrong) the process of writing commands to it is asyncron, this results in that i dont know when to disconnect. i tried to just write the code like this:
Connect("COM1")
'connect function
'Set Text mode
serialPort.WriteLine("AT+CMGF=1" & vbCrLf)
'Read Message
serialPort.WriteLine("AT+CMGR=" & strMessageNr & vbCrLf)
Disconnect() 'disconnect function
'then i have a datarecieve function
Private Sub DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles serialPort.DataReceived
Retval += serialPort.ReadExisting
End Sub
retval is a property i then use to fetch the data.
problem is, when i run Disconnect() the process terminates (as is should)
but the write process (wich is asyncron) is not done, so it terminates before i get any data.
i have not been able to find any "im done writing now" function or return value from the write process
if i had i could always do a pause loop, and ask if its finished.
can anyone help me get out of the dark on this one, because i obviously dont know enough about these things.
thanks alot,
Anders Bohlin.
