🚀 go-pugleaf

"Jeff" <Jeff@nospam.com> wrote in message
news:44902db2@newsgroups.borland.com...

> The problem we're having is that we can't test the buffer for
> data without pulling the data out of the buffer.

Yes, you can.  Look at SetCommMask() and WaitCommEvent() so your reading can
be driven off of COM port events.  When data is available, you will get
EV_RXCHAR events.  Microsoft has a very detailed article on MSDN about how
to properly read from a COM port using COM event masks and error handling.

> Is there a way to test for data in the buffer without pulling it out?

Not specifically, no.

> Err_Ret_Code = (ReadFile(TShComm, InBuff, 10, &dwBytesRead, NULL));
> if (InBuff[0] == '\0') //If no data is returned then return -1

That is not the correct way to know if data ws put into a buffer.  You
should be checking the dwBytesRead value instead:

    if( ReadFile(TShComm, InBuff, 10, &dwBytesRead, NULL) )
    {
        if( dwBytesRead )
            // there is data in the buffer
        else
            // there is no data in the buffer
    }
    else
        // error in reading


Gambit