MS VB "Doevents" method equivalent in C to access serial port

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In MS VB 6.0, I can able to wait until the specified condition met. How can I do the same thing in C.

Public Sub Wait_For_Response()
    Dim Start

   Start = Timer
   
   Do While Timer < Start + 8
      DoEvents
   
      If OK Then
        Exit Sub
      End If
      If Error Then
        Exit Sub
      End If
   Loop
End Sub


Private Sub HandleComEvent(CEvent)
    Select case CEvent
        case "OK"    
               OK = true
        case "Error"
               Error = true
    End Select     
End Sub

OK = false
Error = false

While not Ok or Error
  DoEvents()
  WaitForResponse()
wend

If OK Then
'Statements
End if

If Error Then
'Statements
End if

Above code works fine. Can anyone help me to achieve the same thing C.

1. Open Serial Port in asynchronous mode;
2. WritePort;
3. Wait until OK or Error received
4. if (OK){
//statements
}
5. Read only if Data arrives in Port using "WaitComEvent";

I have used Sleep() function. But not works.

[edit]Code block added, "Ignore HTML..." option deselected - OriginalGriff[/edit]

Posted 29-Jan-11 3:48am

pmk_1969

Updated 29-Jan-11 3:59am

OriginalGriff

v2

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Espen Harlinn · Answer 1 · 2011-01-29T04:08:00

This should help I/O Completion Ports[^]

Do something like this:
Open the serial port with CreateFile() and remember to pass the FILE_FLAG_OVERLAPPED value in the dwFlagsAndAttributes parameter.

You can modify the serial port state as using GetCommState() and SetCommState().

GetCommTimeouts() and SetCommTimeouts() allows you to modify timeouts.

At this point you can use the handle with an IO completion port like a file or socket handle.

Attach the handle to a completion port using CreateIoCompletionPort(), initiate I/O operations with ReadFile() or WriteFile() using an OVERLAPPED structure, dequeue completed, failed or canceled operations from the completion port using GetQueuedCompletionStatus().

Regards
Espen Harlinn

CPallini · Answer 2 · 2011-01-29T04:24:00

Solution 2

You should use threads for the serial communication. See , for instance: "Serial Communications in Win32"[^].
:)

Posted 29-Jan-11 4:24am

CPallini

v2

Comments

Sergey Alexandrovich Kryukov 30-Jan-11 1:02am

Good reference - my 5.
--SA

Espen Harlinn 30-Jan-11 4:20am

5+ it's a better solution, but requires a better understanding of the windows api

Sergey Alexandrovich Kryukov 30-Jan-11 14:08pm

...which make double benefits I should admit.
--SA

Espen Harlinn 30-Jan-11 14:16pm

Sure, when you know how then it's often easier to implement this kind of stuff using a multithreaded design ...