Internet Explorer 编程简述（九）在自己的浏览器中嵌入Google工具条

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class CIESimulator : public IInputObjectSite
{
private:
  IWebBrowser2 *m_pwb; //保存`WebBrowser Control`的接口指针
public:
  CIESimulator(void){};
  ~CIESimulator(void){};

  void SetIWebBrowser2(IWebBrowser2* pwb);

  //IUnknown methods
  STDMETHODIMP QueryInterface(REFIID, void **);

  STDMETHODIMP_(ULONG) AddRef(void);

  STDMETHODIMP_(ULONG) Release(void);

  //IInputObjectSite specific methods
  STDMETHOD(OnFocusChangeIS)(THIS_ IUnknown* punkObj, BOOL fSetFocus);
};

//IUnknown methods
STDMETHODIMP CIESimulator::QueryInterface( REFIID riid, void **ppv )
{
  if ( riid == IID_IInputObjectSite ) //这个接口需要自己处理
  {
    *ppv = static_cast<IInputObjectSite*>(this);
  }
  else if ( m_pwb ) //其它的交给`WebBrowser Control`去处理
  {
    m_pwb->QueryInterface( riid, ppv );
  }
  return S_OK;
}

//IInputObjectSite specific methods
STDMETHODIMP CIESimulator::OnFocusChangeIS(IUnknown* punkObj, BOOL fSetFocus)
{
  return S_OK; //此处我们简单地返回
}

void CIESimulator::SetIWebBrowser2(IWebBrowser2* pwb)
{
  m_pwb = pwb;
}

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enum eBANDTYPE
{
  btVertical = 0,
  btHorizontal = 1
};

enum eBANDSTATE
{
  bsUnInitialized = -1,
  bsVisible = 0,
  bsInVisible = 1,
  bsUnLoaded = 2
};

typedef struct tagIEBANDINFO
{
  char szCLSID[39];
  char szName[MAX_PATH];
  IUnknown *puk;
  HWND hBand;
  UINT uMinHeight;
  UINT uBandID;
  eBANDTYPE eBandType;
  eBANDSTATE eBandState;
} IEBANDINFO, *LPIEBANDINFO;

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void CIEBandPlugInManager::GetAllBandCLSID(void)
{
  LPIEBANDINFO pIEBandInfo;
  pIEBandInfo = new IEBANDINFO();

  strcpy( pIEBandInfo->szCLSID, "{2318C2B1-4965-11d4-9B18-009027A5CD4F}/0"); //Google Toolbar的CLSID

  strcpy( pIEBandInfo->szName, GetDisplayName(pIEBandInfo->szCLSID) );

  pIEBandInfo->uMinHeight = 22;
  pIEBandInfo->uBandID = m_BandCtrlID++;
  pIEBandInfo->eBandType = btHorizontal;
  pIEBandInfo->eBandState = bsUnInitialized;
  m_oaBand.Add( (CObject*)pIEBandInfo );//m_oaBand是一个CObArray
}

//根据CLSID从注册表获取Band的名称
CString CIEBandPlugInManager::GetDisplayName(CString strCLSID)
{
  TCHAR sz[MAX_PATH];
  HKEY hKey;
  DWORD dwSize;

  strCLSID = "CLSID//" + strCLSID;

  if(RegOpenKey(HKEY_CLASSES_ROOT, strCLSID, &hKey) != ERROR_SUCCESS)
  {
    return _T("");
  }

  RegQueryValueEx(hKey, NULL, NULL, NULL, (LPBYTE)sz, &dwSize);

  RegCloseKey(hKey);

  return sz;
}

//通过Band的CLSID激活Band
bool CIEBandPlugInManager::ActivateBand( CString strCLSID )
{

  LPIEBANDINFO pIEBandInfo = GetBandInfo( strCLSID ); //从m_oaBand中找到符合条件的Band的信息
  if ( !pIEBandInfo )
  {
    return false;
  }

  WCHAR wsz[MAX_PATH];
  ::MultiByteToWideChar(CP_ACP, 0, strCLSID, -1, wsz, MAX_PATH);

  CLSID clsid;
  HRESULT hr2 = CLSIDFromString( wsz, &clsid);

  if ( hr2 != NOERROR )
    return false;

  HRESULT hr = ::CoCreateInstance(clsid, NULL, LSCTX_INPROC_SERVER, IID_IUnknown, (void**)&pIEBandInfo->puk); //创建Band对象的实例

  IUnknown* puk = pIEBandInfo->puk;
  if (FAILED(hr))
    return false;

  DoQueryBandInfo( pIEBandInfo ); //查询Band对象实例的信息

  switch( pIEBandInfo->eBandType )
  {
  case btVertical:
    break;
  //我们不处理Vertical的面板
  case btHorizontal:
  {
    g_pMainFrame->m_wndReBar.AddBar2( pIEBandInfo->hBand, pIEBandInfo->uBandID, pIEBandInfo->uMinHeight, 0, 0); //将Band嵌入主窗口的ReBar中

    REBARBANDINFO rbbi;
    rbbi.cbSize = sizeof(rbbi);
    rbbi.fMask = RBBIM_CHILDSIZE | RBBIM_IDEALSIZE | RBBIM_SIZE;
    rbbi.cxMinChild = 0;
    rbbi.cyMinChild = pIEBandInfo->uMinHeight;
    rbbi.cx = rbbi.cxIdeal = 250;
    UINT nCount = g_pMainFrame->m_wndReBar.GetReBarCtrl().GetBandCount();
    g_pMainFrame->m_wndReBar.GetReBarCtrl().SetBandInfo(nCount-1, &rbbi);
    break;
  }
  default:
    break;
  }

  pIEBandInfo->eBandState = bsVisible;
  return true;
}

//查询Band对象实例的信息
void CIEBandPlugInManager::DoQueryBandInfo(LPIEBANDINFO pIEBandInfo)
{
  IObjectWithSite *pOWS;

  //查询IObjectWithSite接口
  HRESULT hr = pIEBandInfo->puk->QueryInterface(IID_IObjectWithSite, (void**)&pOWS);
  if (SUCCEEDED(hr))
  { //设置Site
    pOWS->SetSite( (IUnknown *)&m_IESimulator ); //m_IESimulator是CIESimulator的一个实例对象，对Band对象而言，它就像IE
  }

  IDeskBand *pdb;
  hr = pIEBandInfo->puk->QueryInterface(IID_IDeskBand, (void**)&pdb);
  if (SUCCEEDED(hr))
  { //查询得到Band对象窗口的句柄，稍候通过该句柄将Band对象的窗口嵌入我们指定的窗口
    pdb->GetWindow(&pIEBandInfo->hBand);
  }

  ShowBand(pIEBandInfo, TRUE);//显示Band
}

bool CIEBandPlugInManager::ShowBand(LPIEBANDINFO pIEBandInfo, bool bShow)
{
  IDockingWindow *pdw;

  HRESULT hr = pIEBandInfo->puk->QueryInterface(IID_IDockingWindow, (void**)&pdw);
  if (SUCCEEDED(hr))
  {
    pdw->ShowDW(bShow);
  }
  else
  {
    return false;
  }

  return true;
}