a problemm of using modeless dialog

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all i want to do is to click a menu item, then create a modeless dialog.
i built a new class called CParamDisplay,in the ListTestView.h,i added

#include "ParamDisplay.h"
...
CParamDisplay*	m_pParamdisplay;

and then i added the code in ParamDisplay.h

void CListTestView::OnParamDisplay() 
{
	// TODO: Add your command handler code here
        m_pParamdisplay = new CParamDisplay;

	if (m_pParamdisplay == NULL)
	{
		m_pParamdisplay = new CParamDisplay;
		m_pParamdisplay->Create(ID_PARAM_DISPLAY,this);
	}

	m_pParamdisplay->ShowWindow(SW_SHOW);
}

i ran it,then error;
debug, stopped at:

BOOL CWnd::ShowWindow(int nCmdShow)
{
	ASSERT(::IsWindow(m_hWnd));
...
}

so what's the probelm?

Posted 15-Jan-10 20:48pm

CHYGO

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Graham Breach · Answer 1 · 2010-01-15T21:34:00

If the statement

m_pParamdisplay = new CParamDisplay;

succeedes, you do NOT call Create (while you must call it).

I'd suggest something more like:

void CListTestView::OnParamDisplay() 
{
        m_pParamdisplay = new CParamDisplay;
        if(m_pParamdisplay == NULL)
        {
                // warning message?
                AfxMessageBox("Something went wrong", MB_OK|MB_ICONEXCLAMATION);
        }
        else
        {
                m_pParamdisplay->Create(ID_PARAM_DISPLAY,this);
                m_pParamdisplay->ShowWindow(SW_SHOW);
        }
}

BTW: Even with these modifications the code works only if OnParamDisplay is called just once.