Hi, I want to be able to initiate a suspend, and also set the time for wake-up, from software under windows XP (preferably using C). Can anyone point me in the right direction?? Thanks, Will

Problem solved - I had declared the callback functions to return bool (as 'required' by some other hardware drivers) - changing the return type to LRESULT fixed the problem. I wonder why this compiled ok (I just checked it, it does) before I added the second inheritance?? Thanks for your help. Will

As far as I can tell, yes I do have to derive from D360::CController - it is doing something I don't understand with ATL to interface with the hardware. The only example code the company sent me used multiple inheritance. Is this a general problem with ON_MESSAGE and multiple inheritance, or just a strange quirk of the classes I am trying to inherit from? Will

Hi, I have a class

class CTestDlg : public CDialog , public D360::CController
{

which I want to respond to messages like

BEGIN_MESSAGE_MAP(CTestDlg, CDialog)
//{{AFX_MSG_MAP(CTestDlg)
ON_MESSAGE(OLDA_WM_BUFFER_DONE, OnBufferDone)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

This worked when the CTestDlg class only inherited from CDialog, but now I get the following compilation error

error C2440: 'type cast' : cannot convert from 'int (__thiscall CTestDlg::*)(unsigned int,long)' to 'long (__thiscall CWnd::*)(unsigned int,long)'
Pointers to members have different representations; cannot cast between them

I don't know much about the D360::CController class, it was supplied with some hardware. Any suggestions would be appreciated. Will