I want use cricheditctrl and clistbox to customization my cricheditctrlex control.

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MFC

Hi,
I want use CRichEditCtrl and CListBox to customization my CRichEditCtrlEx control. This CRichEditCtrlEx control just like IntelliSense of VS IDE.
Now, I has some problems that when key down Return button the CListBox could not auto fill compeleted.
Can you give me some advices or sample code?

Thanks very mush!

What I have tried:

void CRichEditCtrlEx::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
	// TODO: Add your message handler code here and/or call default
	if ((nChar == 13))
	{
		// Check the SHIFT key is down or not?
		if (0 == (GetKeyState(VK_SHIFT) & 0x8000))
		{
			if (m_bIsAssistCreated)
			{
				const string buffer(1024, '\0');
				const int index = m_pAssistBox->GetCurSel();
				m_pAssistBox->GetText(index, const_cast<lptstr>(buffer.c_str()));

				m_pAssistBox->DestroyWindow();
				delete m_pAssistBox;
				m_pAssistBox = nullptr;
				m_bIsAssistCreated = false;

				const long nTotalLength = this->GetTextLength();
				const int nCurLine = LineFromChar(-1);
				const int nLength = LineLength(nCurLine);
				
				this->SetSel(nTotalLength - nLength, nTotalLength);
				this->ReplaceSel(buffer.c_str(), TRUE);
				this->Invalidate();
				return;
			}
		}
	}
	else
	{
		const int nCurLine = LineFromChar(-1);
		const int nLength = LineLength(nCurLine);
		string buffer(nLength + 2, '\0');
		this->GetLine(nCurLine, const_cast<lptstr>(buffer.c_str()), static_cast<int>(buffer.capacity()));
		buffer.erase(std::find_if(buffer.begin(), buffer.end(), [](const TCHAR ch) { return ch == '\r'; }), buffer.end());

		if (!m_bIsAssistCreated && !buffer.empty())
		{
			for (const auto item : m_vecSourceData)
			{
				if (string::npos != string(item).find(buffer))
				{
					m_pAssistBox = new CAssistBox();
					m_pAssistBox->SetSource(m_vecSourceData);
					const CSize size = GetStringSize(buffer.c_str());
					CPoint pt = GetCaretPos();
					pt.Offset(-size.cx + 2, 20);
					m_pAssistBox->Create(this, pt);
					m_pAssistBox->AutoSelect(buffer.c_str());
					m_bIsAssistCreated = true;
					break;
				}
			}
		}
		else
		{
			if (m_bIsAssistCreated)
			{
				if (!m_pAssistBox->AutoSelect(buffer.c_str()))
				{
					m_pAssistBox->DestroyWindow();
					delete m_pAssistBox;
					m_pAssistBox = nullptr;
					m_bIsAssistCreated = false;
					Invalidate();
				}
			}
		}
	}

	CRichEditCtrl::OnKeyDown(nChar, nRepCnt, nFlags);
}