如何读取系统剪切板里的字符串数据？

import { pasteboard } from '@kit.BasicServicesKit';

async getDataStr(): Promise<string> {
  // 获取系统剪贴板对象
  let systemPasteboard: pasteboard.SystemPasteboard = pasteboard.getSystemPasteboard();
  let text = '';
  //判断系统剪贴板中是否有内容。
  if (systemPasteboard.hasDataSync()) {
    let data = await systemPasteboard.getData()
    text = data.getPrimaryText();
    if (this.isEmpty(text)) {
      text = data.getPrimaryHtml();
    }
    if (this.isEmpty(text)) {
      text = data.getPrimaryUri();
    }
    if (this.isEmpty(text)) {
      text = '';
    }
  }
  return text
}
isEmpty(str: string | undefined | null): boolean {
  return str == undefined || str == null || str.length == 0;
}