创建方法返回NULL

问题描述

大家好，

我正在研究由控制器类和DialogBox类组成的ATL ActiveX组件.我正在尝试在控制器中创建对话框，但是它不起作用.我将把代码中有趣的部分放在这里.

CAxTestControl类:

Hi All,

I''m working on an ATL ActiveX component which is composed by a controller class and a DialogBox class. I''m trying to create the dialogbox in the controller but it doesn''t work. I''ll put here the interesting parts of the code.

CAxTestControl class:

class ATL_NO_VTABLE CAxTestControl :
	public CComObjectRootEx<CComSingleThreadModel>,
	public CStockPropImpl<CAxTestControl, IAxTestControl>,
	public IPersistStreamInitImpl<CAxTestControl>,
	public IOleControlImpl<CAxTestControl>,
	public IOleObjectImpl<CAxTestControl>,
	public IOleInPlaceActiveObjectImpl<CAxTestControl>,
	public IViewObjectExImpl<CAxTestControl>,
	public IOleInPlaceObjectWindowlessImpl<CAxTestControl>,
	public ISupportErrorInfo,
	public IConnectionPointContainerImpl<CAxTestControl>,
	public CProxy_IAxTestControlEvents<CAxTestControl>,
	public IPersistStorageImpl<CAxTestControl>,
	public ISpecifyPropertyPagesImpl<CAxTestControl>,

	public IProvideClassInfo2Impl<&CLSID_AxTestControl, &__uuidof(_IAxTestControlEvents), &LIBID_axtestLib>,
	public IPropertyNotifySinkCP<CAxTestControl>,
	public CComCoClass<CAxTestControl, &CLSID_AxTestControl>,
	public CComControl<CAxTestControl>,
{
public:

	CCAxTestDialog *m_dlg;
	CAxTestControl():
	m_CommandLineType(koax::koAxCommandLineTypeString)
	{
		m_bWindowOnly = TRUE;


	}

        BEGIN_MSG_MAP(CAxTestControl)
		MESSAGE_HANDLER(WM_CREATE, OnCreate)
		CHAIN_MSG_MAP(CComControl<CAxTestControl>)
		DEFAULT_REFLECTION_HANDLER()
	END_MSG_MAP()

        LRESULT CAxTestControl::OnCreate(UINT /*uMsg*/, WPARAM        /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
       {
	//HRSRC hDlg = AtlFindResource(hInstance, lpTemplateName, (StringType)RT_DIALOG);
	//HRSRC   hRes  = FindResource( AfxGetResourceHandle(), MAKEINTRESOURCE(IDD_CAXTEXTDIALOG), RT_DIALOG);
	m_dlg = new CCAxTestDialog(this);
	HWND hwnd = m_dlg->Create(*this);//returns NULL
	m_dlg->ShowWindow(SW_SHOWNORMAL);
	return 0;
}

有人可以帮忙吗?

Can anyone help? What could be the problem?

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