HarmonyOS 如何通过文件描述符fd获取路径

可以通过fs.dup接口将文件描述符转化为File，然后通过file.path获取路径。

参考代码如下：

import fs from '@ohos.file.fs';
import { common } from '@kit.AbilityKit';
import { BusinessError } from '@kit.BasicServicesKit';

@Entry
@Component
struct FdTest {
  build() {
    Column(){
      Text('FdTest')
        .onClick(() =>{
          let context: common.Context = getContext(this)
          let pathDir = context.filesDir;
          let filePath = pathDir + "/test.txt";
          let file1 = fs.openSync(filePath, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
          try {
            let res = fs.accessSync(filePath);
            if (res) {
              console.info("file exists");
            } else {
              console.info("file not exists");
            }
          } catch(error) {
            let err: BusinessError = error as BusinessError;
            console.error("accessSync failed with error message: " + err.message + ", error code: " + err.code);
          }
          let fd: number = file1.fd;
          let file2 = fs.dup(fd);
          console.info("The name of the file2 is " + file2.name);
          console.info("The Path of the file2 is " + file2.path)
          fs.closeSync(file1);
          fs.closeSync(file2);
        })
    }
    .width('100%')
    .height('100%')
    .justifyContent(FlexAlign.Center)
  }
}

参考文档：fs.dup