🚀 go-pugleaf

Try this:

set timeouts to 15,20,50,15,20

DWORD SendData(HANDLE Comm,void* Data,DWORD Size,DWORD Timeout)
{  
  DWORD BytesWritten=0;
  OVERLAPPED op;
  memset(&op,0,sizeof(op));
  op.hEvent=CreateEvent(NULL,TRUE,FALSE,NULL);
  WriteFile(Comm,Data,Size,&BytesWritten,&op);
  if (Timeout && WaitForSingleObject(op.hEvent,Timeout)==WAIT_OBJECT_0)
     GetOverlappedResult(Comm,&op,&BytesWritten,TRUE);
  CloseHandle(op.hEvent);
  return BytesWritten;
}

if this function returns less bytes send than you want then clear out buffer
  PurgeComm(ModemFile, PURGE_TXABORT | PURGE_TXCLEAR);
and continue with sending data

Sachy

DONG wrote in message 
>In my modem communication software, I use the async. I/O mode for data
>transmission. I defines an Overlap event and then pass it to the writefile
>call.
>
>Before each WriteFile call, I wait for the Overlap event turning to
>singaled state.
>
>But several minutes after the start of transmission, I found that the
>transmission is interrupted and the overlap event remains always
>non-signaled. So I try to restart the transmission with the following
>instructions:
>
>   ClearCommError(ModemFile, &dwError,&dwStatus);
>   PurgeComm(ModemFile, PURGE_TXABORT | PURGE_TXCLEAR);
>   SetEvent(TxOverlap.hEvent);
>
>The modem transmission remains suspended. I have tried to add
>SetCommBreak(.) and ClearCommBreak(). No effect.
>
>Can anyone tell me what it is wrong and how to re-activate the modem
>transmission in such case?
>
>Thanks in advance.
>
>
>Lixin DONG