C++，请问一下，这个类的作用是什么，那些代码是自动生成的

class ie_browser_dlg :
 public CAxDialogImpl<ie_browser_dlg>,
 public IDispEventImpl<IDC_EXPLORER,ie_browser_dlg>
{
 typedef IDispEventImpl<IDC_EXPLORER,ie_browser_dlg> WebBrowser;

public:
 ie_browser_dlg();
 ~ie_browser_dlg(void);

 enum { IDD = IDD_DLG_BROWSER };

 BEGIN_MSG_MAP(ie_browser_dlg)
  MESSAGE_HANDLER(WM_INITDIALOG, OnInitDialog)
  MESSAGE_HANDLER(WM_SIZE, OnSize)
  MESSAGE_HANDLER(WM_DESTROY, OnDestroy)
  MESSAGE_HANDLER(WM_COMMAND, OnCommand)
  MESSAGE_HANDLER(WM_CTLCOLORDLG, OnCtlColor)
  CHAIN_MSG_MAP(CAxDialogImpl<ie_browser_dlg>)
 END_MSG_MAP()

 BEGIN_SINK_MAP(ie_browser_dlg)
  SINK_ENTRY(IDC_EXPLORER, DISPID_DOCUMENTCOMPLETE, DocumentCompleteExplorer)
 END_SINK_MAP()

 LRESULT OnInitDialog(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
 LRESULT OnSize(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
 LRESULT OnDestroy(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
 LRESULT OnCommand(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
 LRESULT OnCtlColor(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);

 void __stdcall DocumentCompleteExplorer(LPDISPATCH pDisp, VARIANT* URL);

 // 用于管理回调的一些函数
 ATL::CString GetHisMsgContent(LONG callbackId);
 void PutHisMsgContent(const ATL::CString & content, int type);
 LONG GetNextCallbackId();
 int  GetCallbackIdType(LONG callbackId);
 virtual BOOL PreTranslateMessage(MSG* pMsg);
private:
 LONG m_plugincookie;
 std::map<LONG, std::pair<ATL::CString , int> > m_hisSysMsg;
 LONG m_pluginmsgid;
 HACCEL m_hAccel;
 // 工作台窗口是否打开标记, 插件应该根据工作台打开来显示不同的界面操作
 // 屏蔽掉工作台关闭后无效的操作按钮, 比如插入聊天记录到输入框这些操作.
 // 每次工作台打开, 再动态显示这些操作按钮.
 bool   m_eservice_maindlg_exist;
 IWebBrowser2 *m_spWebBrowser;

public:
 HRESULT QueryHost(REFIID iid, void** ppUnk);
 
 inline HWND get_ax_wnd() {
  return m_hAxWnd;
 }

private:
 void ReadUrlFromInitFile();
 
private:
 void InitHostObj();
 HRESULT CreateSimpleBrowser();

private:
 TCHAR m_tszUrl[MAX_PATH + 1];
 CComPtr<IWebBrowser2> m_pWeb2;
 ATL::CString m_strDir;
 CComObject<CSimpleHost> *m_pHost;
 STR_VECT m_url_vect;
 STRING m_strModulePath;
 HWND m_hAxWnd;
 CComPtr<Icpp_call_js_obj> m_spCallCppExternal;
};