rs232, ComRdByte (COM_PORT);

[qing22]

I am trying to write a program read byte by byte until return <0, then quit the while loop.  Somehow the program kept on show non-fatal errors telling me the the return -99, which made my program not usable.

Can anyone tell me what should I do.

I tried to reply on event,  eventMask = LWRS_RXFLAG | LWRS_BREAK ,  and use the following code, but the programm lost many messages. Unless it is a single line of message that is received.

/* read until time out or line feed or carriage */
rtn = ComRdTerm (COM_PORT, readBuf, 512, terminationByte);
while ( rtn > 0 )
{
 SetCtrlVal (panelHandle, PANEL_TEXTBOX_Output, readBuf);
 rtn = ComRdTerm (COM_PORT, readBuf, 512, terminationByte);
}

[RobertoBozzolo · Accepted solution]

Error -99 is simply the timeout error: it is possible that you are reading more characters that those effectively on the queue. Anyway, to avoid having interrupted you could remove the checkmark to Run >> Break on >> Library Errors menu option.

[qing22]

Thank you ... removed the checkmark to Run >> Break on >> Library Errors menu option, the annoying break is gone.