MFC对话框响应拖文件WM_DROPFILES

首先初始化启用DragAcceptFiles

    DragAcceptFiles(TRUE);

然后在添加类向导中增加消息：WM_DROPFILES

void CVCMAppDlg::OnDropFiles(HDROP hDropInfo)
{
    CDialogEx::OnDropFiles(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);
  }
    DragFinish(hDropInfo);
}