HarmonyOS http如何读取rawfile中的证书问题

网络没有直接的接口获取证书，获取rawfile资源目录下证书都是用的resourceManager能力获取

createFile(filePath : string , buffer : ArrayBuffer | string){
  getContext(this).area = 0
  let context: Context = getContext(this);
  const keyPemConent = context.resourceManager.getRawFileContentSync('zx.cer')
  let filesDir: string = context.filesDir
  filePath = filesDir + "/testCer.pem";
  let file = fs.openSync(filePath, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
  fs.writeSync(file.fd, keyPemConent.buffer);
  fs.fsyncSync(file.fd);
  fs.closeSync(file);
}