CListCtrl에 파일 drag and drop

//  파일탐색기에서 드래그앤드롭한 파일의 이름을 구해서 리스트컨트롤에 추가

////////////////////////////////////////////
// FileDropListCtrl.h

#pragma once

#include <afxole.h>

////////////////////////////////////////////
// CFileDropTarget

class CFileDropTarget : public COleDropTarget
{
public:
    CFileDropTarget(CWnd* pWnd){m_pParent = pWnd;}
    ~CFileDropTarget(){}

private:
    CWnd* m_pParent;

private:
    BOOL        OnDrop(CWnd* pWnd, COleDataObject* pDataObject, DROPEFFECT dropEffect, CPoint point);
    DROPEFFECT  OnDragEnter(CWnd* pWnd, COleDataObject* pDataObject, DWORD dwKeyState, CPoint point);
    void        OnDragLeave(CWnd* pWnd);
    DROPEFFECT  OnDragOver(CWnd* pWnd, COleDataObject* pDataObject, DWORD dwKeyState, CPoint point);
    DROPEFFECT  OnDragScroll(CWnd* pWnd, DWORD dwKeyState, CPoint point);

public:
    void SetParent(CWnd* pWnd) { m_pParent = pWnd;}
    BOOL FileNamesToList( HDROP hDrop, CPoint point );
};

////////////////////////////////////////////
// CFileDropListCtrl

class CFileDropListCtrl : public CListCtrl
{
    DECLARE_DYNAMIC(CFileDropListCtrl)

public:
    CFileDropListCtrl();
    virtual ~CFileDropListCtrl();

protected:
    DECLARE_MESSAGE_MAP()

    afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);

private:
    CFileDropTarget m_dropTarget;

public:
    void FileDropRegister();

};




///////////////////////////////////////////////////
// FileDropListCtrl.cpp
//

#include "stdafx.h"
#include "FileDropListCtrl.h"

////////////////////////////////////////////////////
// CFileDropTarget


DROPEFFECT CFileDropTarget::OnDragScroll(CWnd* /*pWnd*/, DWORD /*dwKeyState*/, CPoint /*point*/)
{
   // return DROPEFFECT_SCROLL | DROPEFFECT_COPY | DROPEFFECT_LINK;
       return DROPEFFECT_SCROLL | DROPEFFECT_COPY;
}

DROPEFFECT CFileDropTarget::OnDragEnter(CWnd* /*pWnd*/, COleDataObject* /*pDataObject*/,
                                      DWORD /*dwKeyState*/, CPoint /*point*/)
{
    return DROPEFFECT_COPY;
}

void CFileDropTarget::OnDragLeave(CWnd* /*pWnd*/)
{
}

DROPEFFECT CFileDropTarget::OnDragOver(CWnd* /*pWnd*/, COleDataObject* /*pDataObject*/,
                                     DWORD /*dwKeyState*/, CPoint /*point*/)
{
    return DROPEFFECT_COPY;
}

BOOL CFileDropTarget::OnDrop(CWnd* /*pWnd*/, COleDataObject* pDataObject,
                           DROPEFFECT /*dropEffect*/, CPoint point)
{
    try
    {
        if( pDataObject->IsDataAvailable( CF_HDROP ) )
        {
            STGMEDIUM StgMed;
            FORMATETC fmte = {CF_HDROP, (DVTARGETDEVICE FAR *)NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
            if( pDataObject->GetData( CF_HDROP, &StgMed, &fmte ) )
            {
                if(! FileNamesToList( (HDROP)StgMed.hGlobal, point ) )
                {
                    return FALSE;
                } // if(! FileNamesToList( (HDROP)StgMed.hGlobal, point ) )

                if (StgMed.pUnkForRelease)
                {
                    StgMed.pUnkForRelease->Release();
                }
                else   
                {
                    ::GlobalFree(StgMed.hGlobal);
                } // if (StgMed.pUnkForRelease)...else
                return TRUE;
            } // if( pDataObject->GetData( CF_HDROP, &StgMed, &fmte ) )
        } // if( pDataObject->IsDataAvailable( CF_HDROP ) )
    } // try
    catch(...)
    {
        return FALSE;
    }
    return TRUE;
}


BOOL CFileDropTarget::FileNamesToList( HDROP hDrop, CPoint point )
{
    UINT cFiles = ::DragQueryFile(hDrop, (UINT)-1, NULL, 0);              
  
    if(cFiles <= 0)
    {
        return FALSE;
    }

    TCHAR szFile[MAX_PATH];
  
    for( UINT count = 0; count < cFiles; count++ )
    {
        ::DragQueryFile(hDrop, count, szFile, sizeof(szFile));

        if( (m_pParent != NULL ) && ( ::IsWindow( m_pParent->GetSafeHwnd() ) != FALSE))
        {
            CListCtrl * pListCtrl = dynamic_cast<CListCtrl*>(m_pParent);
            if( pListCtrl != NULL )
            {
                UINT uFlags;
                int nItem = pListCtrl->HitTest(point, &uFlags);              

                CString strItem;
                strItem.Format(_T("file=%s, nItem=%d, flag=0x%04x"),szFile, nItem, uFlags );
                pListCtrl->InsertItem(0, strItem);
            } //  if( pListCtrl != NULL )
        } // if( (m_pParent != NULL ) && ( ::IsWindow( m_pParent->GetSafeHwnd() ) != FALSE))

    } // for( UINT count = 0; count < cFiles; count++ )

    return TRUE;
}




////////////////////////////////////////////////////
// CFileDropListCtrl

IMPLEMENT_DYNAMIC(CFileDropListCtrl, CListCtrl)

CFileDropListCtrl::CFileDropListCtrl() : m_dropTarget(this)
{
}

CFileDropListCtrl::~CFileDropListCtrl()
{
}


BEGIN_MESSAGE_MAP(CFileDropListCtrl, CListCtrl)
    ON_WM_CREATE()  
END_MESSAGE_MAP()



// CFileDropListCtrl 메시지 처리기입니다.

int CFileDropListCtrl::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    if (CListCtrl::OnCreate(lpCreateStruct) == -1)
        return -1;

    // TODO:  여기에 특수화된 작성 코드를 추가합니다.
    FileDropRegister();

    return 0;
}

void CFileDropListCtrl::FileDropRegister()
{
    DragAcceptFiles();
    m_dropTarget.Register(this); 
}