int CSerial::ReadData(void *buffer, int limit)
{

	if (!m_bOpened || m_hIDComDev == NULL) return(0);

	BOOL bReadStatus;
	DWORD dwBytesRead, dwErrorFlags;
	COMSTAT ComStat;

	ClearCommError(m_hIDComDev, &dwErrorFlags, &ComStat);
	if (!ComStat.cbInQue) return(0);

	dwBytesRead = (DWORD)ComStat.cbInQue;
	if (limit < (int)dwBytesRead) dwBytesRead = (DWORD)limit;

	bReadStatus = ReadFile(m_hIDComDev, buffer, dwBytesRead, &dwBytesRead, &m_OverlappedRead);
	if (!bReadStatus){
		if (GetLastError() == ERROR_IO_PENDING){
			WaitForSingleObject(m_OverlappedRead.hEvent, 2000);
			return((int)dwBytesRead);
		}
		return(0);
	}

	return((int)dwBytesRead);

}