在1中试试:
m_abData.cbSize = sizeof(m_abData);
m_abData.hWnd = m_hWnd;
m_abData.uCallbackMessage = WM_MYAPPBAR;    //WM_MYAPPBAR=WM_USER+100    m_abData.lParam=true;
m_abData.uEdge = ABE_LEFT;
//加上:
m_abData.rc.left = 0;
m_abData.rc.right= 50;
m_abData.rc.top = 0;
m_abData.rc.bottom = 600;
SHAppBarMessage(ABM_NEW, &m_abData);
SHAppBarMessage(ABM_SETPOS, &m_abData);
//////////////////////////////////////    if(!SHAppBarMessage(ABM_SETAUTOHIDEBAR,&m_abData))
                {
        MessageBox("Can not create App bar");
        PostQuitMessage(WM_QUIT);
                }