/// <summary>
/// Constructor for a DCB, using the DCB provided by another object.
/// </summary>
/// <param name="handle">Valid handle to a serial port object.</param>
/// <param name="state">A CommState object for which the DCB settings should be
/// taken. Note, the handle managed by the state object is ignored. If this
/// parameter is null, then a default DCB is created.</param>
internal CommState(SafeFileHandle handle, CommState state)
{
m_ComPortHandle = handle;
if (state == null) {
m_Dcb.DCBLength = Marshal.SizeOf(m_Dcb);
GetCommState();
} else {
m_Dcb = state.m_Dcb;
}
}
public static extern bool GetCommState(SafeFileHandle hFile, ref NativeMethods.DCB lpDCB);