MFC implementation dialog to edit control drag and drop files

This article example for you to share MFC implementation dialog box edit control drag and drop file specific code, for your reference, specific content is as follows

steps

1. Overload the CEdit class
2. Add edit box control

First, override the CEdit class, define a derived CDragEdit class, and override its WM_CREATE method to add DragAcceptFile(TRUE). Methods.

// 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);
};

Then, use the class wizard to add the corresponding function of WM_DROPFILE message to the CDragEdit class.

//CDragEdit.cpp

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

 // TODO:  Add your own creation code here 
 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); // After successful drag and drop, free memory 
 }
 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;
}

Finally, set the textbox control property [Accept Files] and the value [multiline] to True.