About ITextHost::TxNoTify can't receive the message EN_CHANGE? how can i know the change of content?

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C++

hi, hello everyone.

i try to use windowlessRichedit,i have a problem.
i find that,the function ITextHost::TxNoTify can't receive EN_CHANGE.here, i can receive,EN_UPDATE,EN_SETFOCUS,EN_KILLFOCUS and so on,but without EN_CHANGE.

so i don't know the change of the richedit.

can you help me?

the key code:

HRESULT CTxtWinHost::TxNotify(DWORD iNotify, void *pv)
{
	if( iNotify == EN_REQUESTRESIZE )
	{
		RECT rc;
		REQRESIZE *preqsz = (REQRESIZE *)pv;
		
		GetControlRect(&rc);
		rc.bottom = rc.top + preqsz->rc.bottom + HOST_BORDER;
		rc.right  = rc.left + preqsz->rc.right + HOST_BORDER;
		rc.top -= HOST_BORDER;
		rc.left -= HOST_BORDER;
		
		SetClientRect(&rc, TRUE);
		
		return S_OK;
	} 
	if(iNotify==EN_CHANGE)
	{
                // it shall run here but it don't
		int a=0 ;
		sleep(1000);
	}

	// Forward this to the container
	if (pnc)
	{
		(*pnc)(iNotify);
	}

	if(!cfCallBackFun.isEmpty())
		cfCallBackFun(iNotify);

	if (iNotify==EN_OLEOPFAILED)
	{
		return S_FALSE;
	}

	return S_OK;
}

3Q
dawei.lin 2012-11-05