问如何在google drive文件夹中获取图像的urls？

EN

function getParentFolder() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var SSID=ss.getId();

  var fileInDrive = DriveApp.getFolderById(SSID);
  var folderinDrive = fileInDrive.getParents().next().getName();

  return folderinDrive;
}

function listFilesInFolder() {
  var parentFolder = getParentFolder();
  Logger.log("Parent: " + parentFolder);
  var folder = DocsList.getFolder(parentFolder);
  var parentFiles = folder.getFiles();
  var folders = folder.getFolders();

  var file;
  var allFolders;
  var subFileList;
  var data;

  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getActiveSheet;
  sheet.clear();

  sheet.appendRow(["Name", "Date Created", "URL", "Type", "Last Updated", "Parent Folder"]);

  // Every file in the folder containing this file.
  for (var i = 0; i < parentFiles.length; i++) {
    file = parentFiles[i];

    var parentName = "";
    try {
      var parentName = file.getParents()[0].getName();
    } catch(err) {}   

    data = [ 
      file.getName(),
      file.getDateCreated(),
      file.getUrl(),
      file.getFileType(),
      file.getLastUpdated(),
      parentFolder
    ];

    sheet.appendRow(data);
  } 
  // Every subfolder in the folder containing this file.
  for (var i = 0; i < folders.length; i++) {
    allFolders = folders[i];
    var parentName = "";
    try {
      var parentName = allFolders.getParents()[0].getName();
    } catch(err) {}    
    data = [ 
      allFolders.getName(),
      allFolders.getDateCreated(),
      allFolders.getUrl(),
      "folder",
      allFolders.getLastUpdated(),
      parentName
    ];

    sheet.appendRow(data);
  }


  for (var i = 0; i < folders.length; i++) {
    allFolders = folders[i];
    var subFiles = allFolders.getFiles();

    for (var j = 0; j < 100; j++) {
      subFileList = subFiles[j];
      try {
        data = [ 
          subFileList.getName(),
          subFileList.getDateCreated(),
          subFileList.getUrl(),
          subFileList.getFileType(),
          subFileList.getLastUpdated(),
          subFileList.getParents()[0].getName()
        ];

        sheet.appendRow(data);
      } catch(err) {

      }
    }
  }
};