Question

我创建了一个ATL窗口较少的控件，类定义是这样的：

    class ATL_NO_VTABLE CRSPClient :
    public IObjectSafetyImpl<CRSPClient, INTERFACESAFE_FOR_UNTRUSTED_CALLER|INTERFACESAFE_FOR_UNTRUSTED_DATA>,
    public CComObjectRootEx<CComSingleThreadModel>,
    public IDispatchImpl<IRSPClient, &IID_IRSPClient, &LIBID_axBanckleRSPClientLib, /*wMajor =*/ 1, /*wMinor =*/ 0>,
    public IPersistStreamInitImpl<CRSPClient>,
    public IOleControlImpl<CRSPClient>,
    public IOleObjectImpl<CRSPClient>,
    public IOleInPlaceActiveObjectImpl<CRSPClient>,
    public IQuickActivateImpl<CRSPClient>,
    public IViewObjectExImpl<CRSPClient>,
    public IOleInPlaceObjectWindowlessImpl<CRSPClient>,
#ifdef _WIN32_WCE // IObjectSafety is required on Windows CE for the control to be loaded correctly
    public IObjectSafetyImpl<CRSPClient, INTERFACESAFE_FOR_UNTRUSTED_CALLER>,
#endif
    public CComCoClass<CRSPClient, &CLSID_RSPClient>,
    public CComControl<CRSPClient>

然后出于某种目的，我需要将消息发布到窗口。我试图以很多方式获取窗口的句柄，但所有这些都失败了：

    HWND CRSPClient::GetHwnd()
{
    HWND hwndRet = NULL;
    // hwndRet = m_hWnd;
    //IOleInPlaceActiveObjectImpl<CRSPClient>::GetWindow(&hwndRet);
    //IOleWindow<CRSPClient>::GetWindow(&hwndRet);
    //this->m_spInPlaceSite->GetWindow(&hwndRet);
    //CComQIPtr<IOleInPlaceSite> spSite = this->m_spClientSite;
    //spSite->GetWindow(&hwndRet);
    //hwndRet = ::WindowFromDC(GetDC());
    return hwndRet;
}

有人知道有没有办法获得HWND？

OMG我对微软强大的ATL框架感到非常沮丧！

Answer 1

以下是一些代码来自Microsoft的Direct3D ATL示例。我还没有测试过它。

// Get the window we need to use. This will either be the window that has already
// been created if we are window. If we are windowless the HWND of the client
// will be retrieved from the HDC.
void GetOurWindow()
{
    // If we're windowless we still need an HWND for Direct3d
    if (m_bWndLess)
    {
        HDC hDC;

        // Get the HDC from the client
        m_spInPlaceSite->GetDC(NULL, OLEDC_NODRAW, &hDC);
        m_hOurWnd = WindowFromDC(hDC);
    #if 1
        // Code to make VB5 paint properly now it has clipped it's own hDC
        RECT rect;
        ::GetClientRect(m_hOurWnd,&rect);
        HRGN hRegion = CreateRectRgn(rect.left,rect.top,rect.right,rect.bottom);
        SelectClipRgn(hDC,hRegion);
    #endif
        m_spInPlaceSite->ReleaseDC(hDC);
    }
    else
        m_hOurWnd = m_hWnd;
}

Answer 2

无窗口控制的重点在于它没有窗口句柄。如果你想使用窗口句柄，万一它存在并且控件重新进入窗口模式，那么很容易：m_hWndCD。

如果不是你必须有一个窗口，那么你有m_bWindowOnly在构造函数中标记并表明你需要一个HWND：

表示控件的标志应该加窗，即使容器支持无窗口控件。

如果您仍然希望它无窗口并且有时需要一个窗口，在运行时出现的某些条件下，您始终可以选择创建私有message only window并通过它发送消息。

如何获得无窗口ATL控件的HWND？

2 个答案: