class CMainFrameWnd : public CWindowWnd, public INotifyUI, public IMessageFilterUI
{
public:
    CMainFrameWnd() { m_fixed = FALSE; m_errorcode = 0;};
    LPCTSTR GetWindowClassName() const { return _T("UIMainFrame"); };
    UINT GetClassStyle() const { return UI_CLASSSTYLE_DIALOG; };
    void OnFinalMessage(HWND /*hWnd*/)
    {
        m_pm.RemovePreMessageFilter(this);
        delete this;
    }

void Init()
    {
        CContainerUI* pAccountCombo;
        pAccountCombo = static_cast<CContainerUI*>(m_pm.FindControl(_T("ContainerUIStep2")));
        pAccountCombo->SetVisible(FALSE);
        pAccountCombo = static_cast<CContainerUI*>(m_pm.FindControl(_T("ContainerUIStep1")));
        pAccountCombo->SetVisible(TRUE);
        pAccountCombo = static_cast<CContainerUI*>(m_pm.FindControl(_T("ContainerUIStep3")));
        pAccountCombo->SetVisible(FALSE);

}

void BtnClose_Click()
     {
          PostQuitMessage(0);
     }

void BtnWin7_Click()
     {
          m_bOsType = WIN_WIN7;
          CLabelUI* pAccountEdit = static_cast<CLabelUI*>(m_pm.FindControl(_T("LabelUIDescription")));
          pAccountEdit->SetText(_T("正在下载 Win7 系统到您的计算机..."));

CContainerUI* pAccountCombo = static_cast<CContainerUI*>(m_pm.FindControl(_T("ContainerUIStep2")));
          pAccountCombo->SetVisible(TRUE);
          pAccountCombo = static_cast<CContainerUI*>(m_pm.FindControl(_T("ContainerUIStep1")));
          pAccountCombo->SetVisible(FALSE);

CProgressUI* pProcess = static_cast<CProgressUI*>(m_pm.FindControl(_T("ProgressDownload")));
          pProcess->SetValue(0);
          CLabelUI* pWaitLabel = static_cast<CLabelUI*>(m_pm.FindControl(_T("LabelWaiting")));
          pWaitLabel->SetText(_T("开始下载, 请耐心等待..."));

g_status = TO_GET_CONFIG; // start
          ::SetTimer(m_hWnd, TIMER_ID_CHECKDOWNLOADWND, 1000, NULL);
     }

void Notify(TNotifyUI& msg)
    {
        if( msg.sType == _T("click") )
          {
               // 关闭按钮
            if( msg.pSender->GetName() == _T("BtnClose") )
            {
                BtnClose_Click();
                return;
            }
            else if ( msg.pSender->GetName() == _T("BtnXP"))
               {
                    BtnXP_Click();
                return;
               }
               else if (msg.pSender->GetName() == _T("BtnWin7") )
               {
                    BtnWin7_Click();
                return;
               }
               // 重启动完成安装
               else if (msg.pSender->GetName() == _T("ButtonUIReboot"))
               {
                    ButtonUIReboot_Click();
                return;
               }
               
        }
        else if( msg.sType == _T("itemselect") )
        {
            if( msg.pSender->GetName() == _T("accountcombo") )
            {
                CEditUI* pAccountEdit = static_cast<CEditUI*>(m_pm.FindControl(_T("accountedit")));
                if( pAccountEdit )
                    pAccountEdit->SetText(msg.pSender->GetText());
            }
        }
    }

LRESULT OnCreate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
    {
          SetIcon(IDI_ICON_WINGIRL);      // 加上以后运行的时候有图标

LONG styleValue = ::GetWindowLong(*this, GWL_STYLE);
        styleValue &= ~WS_CAPTION;
        ::SetWindowLong(*this, GWL_STYLE, styleValue | WS_CLIPSIBLINGS | WS_CLIPCHILDREN);

m_pm.Init(m_hWnd);
        m_pm.AddPreMessageFilter(this);
        CDialogBuilder builder;
        CControlUI* pRoot;
          if (IsWindowsVistaUp())
               pRoot = builder.Create(_T("UIMainWin7.xml"), (UINT)0, NULL, &m_pm);
          else
               pRoot = builder.Create(_T("UIMainXP.xml"), (UINT)0, NULL, &m_pm);
        ASSERT(pRoot && "Failed to parse XML");
        m_pm.AttachDialog(pRoot);
        m_pm.AddNotifier(this);

Init();
        return 0;
    }

LRESULT OnNcActivate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
    {
        if( ::IsIconic(*this) ) bHandled = FALSE;
        return (wParam == 0) ? TRUE : FALSE;
    }

LRESULT OnNcCalcSize(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
    {
        return 0;
    }

LRESULT OnNcPaint(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
    {
        return 0;
    }

LRESULT OnNcHitTest(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
    {
        POINT pt;
        pt.x = GET_X_LPARAM(lParam);
        pt.y = GET_Y_LPARAM(lParam);
        ::ScreenToClient(*this, &pt);

RECT rcClient;
        ::GetClientRect(*this, &rcClient);

RECT rcCaption = m_pm.GetCaptionRect();
        if( pt.x >= rcClient.left + rcCaption.left
            && pt.x < rcClient.right - rcCaption.right
            && pt.y >= rcCaption.top
            && pt.y < rcCaption.bottom )
        {
            CControlUI* pControl = static_cast<CControlUI*>(m_pm.FindControl(pt));
               if (!m_fixed)
                    if( pControl && _tcscmp(pControl->GetClass(), _T("ButtonUI")) != 0 )
                         return HTCAPTION;
        }

return HTCLIENT;
    }

void ShowMessage(CString msg)
     {
          CLabelUI* pAccountEdit = static_cast<CLabelUI*>(m_pm.FindControl(_T("LabelWaiting")));
          pAccountEdit->SetText(msg);
     }

LRESULT OnSize(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
    {
        SIZE szRoundCorner = m_pm.GetRoundCorner();
        if( !::IsIconic(*this) && (szRoundCorner.cx != 0 || szRoundCorner.cy != 0) )
        {
            CRect rcWnd;
            ::GetWindowRect(*this, &rcWnd);
            rcWnd.Offset(-rcWnd.left, -rcWnd.top);
            rcWnd.right++;
            rcWnd.bottom++;
            HRGN hRgn = ::CreateRoundRectRgn(rcWnd.left, rcWnd.top, rcWnd.right, rcWnd.bottom, szRoundCorner.cx, szRoundCorner.cy);
            ::SetWindowRgn(*this, hRgn, TRUE);
            ::DeleteObject(hRgn);
        }

bHandled = FALSE;
        return 0;
    }
    //

// ...

//

}

问题来了，程序编译出来后，没有图标，而且运行时在任务栏也没有图标。然后看了所有的duilib例子，都是这样。于是研究了一下，在资源文件中加入图标，并在oncreate中调用SetIcon(IDI_ICON_XXX)，问题就解决了。

之前看到同事做的工具，觉得duilib功能还差很多，比如不支持动画，界面设计工具功能简单。但是现在用duilib开发了这个软件后，发现duilib实际上挺好用的。虽然duilib的界面设计工具不怎么好用，但是直接写xml界面也简单。而且可以先用设计工具设计局部，然后把代码拷贝到界面xml文件中。我在设计界面的过程中就常用这个小技巧。