Serial buffer flushing

I am reciving data (16 bytes) from system serially every 20ms and I want to receive the recent data every 20ms which am not able to do. So I thought of flushing the serial buffer to receive the recent data. Can anybody tell me how to flush the serial buffer. Its urgent plz.

Thanks,
Guddappa T H

Serial Communications have been discussed several times in this forum. Use the Search option to search for related articles.

Well, why don't you show us the code you have, and let us try to figure what is the problem with it? It's hard to do that from the info you provided.

Hai,
This is a program for serial data reception. Can you tell me how this code is working. It is programmed to receive 18 bytes (a configured data packet of 18 bytes) of data.......

Code is:


CTimerDlg::OnOnComm()
{
if(m_comm.GetCommevent() == 2) // m_comm is serial member variable
{
UCHAR *parray; // local array
COleVariant var;

var = m_comm.GetInput();
long comL;
HRESULT hr = SafeAraayGetUBound(var.parray , 1 , &comL);

if(hr == S_OK)
{

hr = SafeArrayAccessData(var.parray , (void**)&parray);
if(hr == S_OK)
{
for(int i=0;i<18;i++)
Rxdata[RxBuffcount++]=parray[i]; //local array
}

SafeArrayUnaccessData(var.parray);

if(RxBuffcount == 18) // if 18 bytes received proceed
{

Processdata(); // data processing
RxBuffcount = 0;
}
}

}
}



This is the code and all the time am getting the same data even if am transmitting different data.

My questions are:
1. How is this code working.
2. Is this code receiving data bytewise or not .


Plz help me.

Regards,
Guddappa T H