protected WndProcMessage GetReceivedMessage(ref Message m)
{
WndProcMessage rec = new WndProcMessage();
rec.pdulength = Marshal.ReadInt32(m.LParam, 0);
rec.pdu = new byte[rec.pdulength];
byte[] buffer = new byte[rec.pdulength + 4];
Marshal.Copy(m.LParam, buffer, 0, buffer.Length);
Buffer.BlockCopy(buffer, 4, rec.pdu, 0, rec.pdulength);
return(rec);
}
protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
case WM_M_CONNECTPLCSIM:
ConnectPlcsimStatemachine();
break;
case WM_M_SENDDATA:
if (m.LParam != IntPtr.Zero)
{
if (m_PlcsimConnectionState == PlcsimConnectionState.Connected)
{
WndProcMessage msg = GetReceivedMessage(ref m);
SendDataToPlcsim(msg);
}
}
break;
case WM_M_EXIT:
if (m_PlcsimConnectionState == PlcsimConnectionState.Connected)
{
m_PlcsimConnectionState = PlcsimConnectionState.DisconnectState1;
DisconnectPlcsimStatemachine();
}
break;
case WM_SINEC:
switch (m_PlcsimConnectionState)
{
case PlcsimConnectionState.NotConnected:
case PlcsimConnectionState.ConnectState1:
case PlcsimConnectionState.ConnectState2:
case PlcsimConnectionState.ConnectState3:
ConnectPlcsimStatemachine();
break;
case PlcsimConnectionState.Connected:
ReceiveFromPlcsimAndSendBack();
break;
}
break;
default:
base.WndProc(ref m);
break;
}
}
private static long WndProcDetour(IntPtr hWnd, uint msg, ulong wParam, long lParam)
{
// Ignore things not targeting the current window handle
if (hWnd == WndProcHandler.hWnd)
{
var resp = WndProcMessage?.Invoke((WindowsMessage)msg, wParam, lParam);
// Item1 is a bool, where true == capture event. If false, we're falling through default handling.
if (resp.HasValue && resp.Value.Item1)
{
return(resp.Value.Item2);
}
}
return(NativeMethods.CallWindowProc(oldWndProcPtr, hWnd, msg, wParam, lParam));
}
private void SendDataToPlcsim(WndProcMessage msg)
{
if (++m_user >= 32000)
{
m_user = 1;
}
S7OexchangeBlock snd = GetNewS7OexchangeBlock(user: m_user, rb_type: 2, subsystem: 0x40, opcode: 6, response: 0xff);
snd.offset_1 = 80;
snd.application_block_opcode = m_application_block_opcode;
snd.application_block_subsystem = m_application_block_subsystem;
snd.fill_length_1 = (ushort)msg.pdu.Length;
snd.seg_length_1 = (ushort)msg.pdu.Length;
snd.user_data_1 = new byte[SIZE_OF_USER_DATA_1];
Array.Copy(msg.pdu, snd.user_data_1, msg.pdu.Length);
SendS7OExchangeBlockToPlcsim(snd);
}
