f9/sdk/dart/package-fuchsia_vfs_vfs/PseudoFile/PseudoFile.readOnlyStr.md

# PseudoFile.readOnlyStr constructor




    *[<Null safety>](https://dart.dev/null-safety)*



PseudoFile.readOnlyStr([ReadFnStr](../../package-fuchsia_vfs_vfs/ReadFnStr.md) fn)


<p>See <code>#readOnly()</code>.  Wraps the callback, allowing it to return a String instead of a Uint8List,
but otherwise behaves identical to <code>#readOnly()</code>.</p>



## Implementation

```dart
PseudoFile.readOnlyStr(ReadFnStr fn)
    : _capacity = 0,
      assert(fn != null) {
  _readFn = _getReadFn(fn);
}
```