CListCtrl에서 Drag & Drop 구현

.h
CImageList* m_pImgListDrag;

.cpp
void CDragDemoDlg::OnLvnBegindragListLeft(NMHDR *pNMHDR, LRESULT *pResult)
{
  LPNMLISTVIEW pNMLV = reinterpret_cast(pNMHDR);

  // ptDrag : 드래그하는 항목의 ListCtrl 기준 좌표
  CPoint ptDrag, ptAction;
  m_nIndexLeftSel = pNMLV->iItem;
  m_pImgListDrag = m_List_Left.CreateDragImage(pNMLV->iItem, &ptDrag);
  m_pImgListDrag->SetBkColor(RGB(0, 0, 0));
  ptAction = pNMLV->ptAction;

  SetCapture();
  m_pImgListDrag->BeginDrag(0, ptAction - ptDrag);
  m_List_Left.ClientToScreen(&ptAction);
  m_pImgListDrag->DragEnter(NULL, ptAction);//드래그 상태

  *pResult = 0;
}

void CDragDemoDlg::OnMouseMove(UINT nFlags, CPoint point)
{
  if(m_pImgListDrag != NULL)
  {
    ClientToScreen(&point);

    CWnd* pWnd = CWnd::WindowFromPoint(point);
    if(pWnd != NULL)
    {
      if(this == pWnd || IsChild(pWnd))
      {
        m_pImgListDrag->DragEnter(NULL, point);//지워진 드래그 이미지를 화면에 다시 나오게 함
        m_pImgListDrag->DragMove(point);//드래그 이미지 출력
      }
      else
      {
        m_pImgListDrag->DragLeave(NULL);//드래그 이미지를 화면에서 지운다.
      }
    }
  }

  CDialog::OnMouseMove(nFlags, point);
}

void CDragDemoDlg::OnLButtonUp(UINT nFlags, CPoint point)
{
  CString strTmp = _T("");
  if(m_pImgListDrag != NULL)
  {
    ClientToScreen(&point);

    m_pImgListDrag->DragLeave(NULL);
    m_pImgListDrag->EndDrag();
    ReleaseCapture();

    //오른쪽 리스트에 아이템 추가.
    CWnd* pWnd = CWnd::WindowFromPoint(point);
    if(pWnd == &m_List_Right && m_nIndexLeftSel >= 0)
    {
      LVITEM lvItem;
      TCHAR szBuffer[256];
      ::ZeroMemory(&lvItem, sizeof(lvItem));
      ::ZeroMemory(szBuffer, sizeof(256));

      lvItem.mask = LVIF_TEXT | LVIF_IMAGE;
      lvItem.iItem = m_nIndexLeftSel;
      lvItem.pszText = szBuffer;
      lvItem.cchTextMax = 256;
      m_List_Left.GetItem(&lvItem);

      m_List_Right.InsertItem(0, lvItem.pszText, lvItem.iImage);
    }

    //왼쪽 리스트이면 구체적인 아이템 인덱스 출력.
    else
    {
      m_List_Left.ScreenToClient(&point);
      int nIndex = m_List_Left.HitTest(point);
      if(nIndex >= 0)
      {
        strTmp.Format(_T("Drop on %dth item"), nIndex);
        AfxMessageBox(strTmp);
      }
    }

    delete m_pImgListDrag;
    m_pImgListDrag = NULL;
    m_nIndexLeftSel = -1;
  }

  CDialog::OnLButtonUp(nFlags, point);
}