MFC如何实现对话框编辑控件上拖拽文件？

// CDragEdit.h

#pragma once

class CDragEdit : public CEdit
{
 DECLARE_DYNAMIC(CDragEdit)

public:
 CDragEdit();
 virtual ~CDragEdit();

protected:
 DECLARE_MESSAGE_MAP()
public:
 afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
 afx_msg void OnDropFiles(HDROP hDropInfo);
};

//CDragEdit.cpp

int CDragEdit::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
 if (CEdit::OnCreate(lpCreateStruct) == -1)
 return -1;

 // TODO: 在此添加您专用的创建代码
 DragAcceptFiles(TRUE);

 return 0;
}


void CDragEdit::OnDropFiles(HDROP hDropInfo)
{
 UINT count;
 TCHAR filePath[MAX_PATH] = { 0 };
 count = DragQueryFile(hDropInfo, -1, NULL, 0);
 if (1 == count)
 {
 DragQueryFile(hDropInfo, 0, filePath, sizeof(filePath));
 this->SetWindowTextW(filePath);
 UpdateData(FALSE);
 DragFinish(hDropInfo); //拖放成功后，释放内存
 }
 else 
 {
 CString szFilePath;
 for (UINT i = 0; i < count; i++)
 {
 int pahtLen = DragQueryFile(hDropInfo, i, filePath, sizeof(filePath));
 szFilePath = szFilePath + filePath + _T("\r\n");
 }
 this->SetWindowTextW(szFilePath);
 UpdateData(FALSE);
 DragFinish(hDropInfo);
 }

//MFCDlg.h

#program once
#include "CDragEdit.h"

class CMFDlg : public CDialogEx
{
……………………
public:
 CDragEdit m_DragEdit;
}