*.h
afx_msg LRESULT (WPARAM wParam, LPARAM lParam);

*.cpp
LRESULT Cmfc01aDlg::OnMyMessage(WPARAM wParam, LPARAM lParam)
{
    ::AfxMessageBox(_T("自定义的消息"));
    return 0;
}

BEGIN_MESSAGE_MAP(Cmfc01aDlg, CDialog)
    ON_MESSAGE(WM_MYMESSAGE,OnMyMessage) 
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

#define WM_DEMO_LOG_CLEAR		(WM_USER + 1)	//清空日志输出
#define WM_DEMO_ADD_DEVICE		(WM_USER + 2)	//添加设备
#define WM_DEMO_DEL_DEVICE		(WM_USER + 3)	//删除设备

BEGIN_MESSAGE_MAP(CZLNetSDKDemoDlg, CDialogEx)
...
ON_COMMAND_RANGE(WM_DEMO_LOG_CLEAR, WM_DEMO_DEL_DEVICE, &DemoDlg::OnTreeMessage)
...
END_MESSAGE_MAP()

void CZLNetSDKDemoDlg::OnTreeMessage(UINT nID)
{
	//设备树右键菜单消息处理
	switch (nID)
	{
	case WM_DEMO_LOG_CLEAR:
        break;
    case WM_DEMO_ADD_DEVICE:
        break;
    case WM_DEMO_DEL_DEVICE:
        break;
    }
}