---
title: structureOutputMaximumSize
framework: driverkit
role: symbol
role_heading: Instance Property
path: driverkit/iouserclientmethodarguments/structureoutputmaximumsize
---

# structureOutputMaximumSize

The maximum size of the output structure that you specified.

## Declaration

```occ
uint64_t structureOutputMaximumSize;
```

## Discussion

Discussion Specify kIOUserClientVariableStructureSize to allow for output data that is variable in size.

## See Also

### Getting the Method Arguments

- [version](driverkit/iouserclientmethodarguments/version.md)
- [selector](driverkit/iouserclientmethodarguments/selector.md)
- [completion](driverkit/iouserclientmethodarguments/completion.md)
- [scalarInput](driverkit/iouserclientmethodarguments/scalarinput.md)
- [scalarInputCount](driverkit/iouserclientmethodarguments/scalarinputcount.md)
- [structureInput](driverkit/iouserclientmethodarguments/structureinput.md)
- [structureInputDescriptor](driverkit/iouserclientmethodarguments/structureinputdescriptor.md)
- [scalarOutput](driverkit/iouserclientmethodarguments/scalaroutput.md)
- [scalarOutputCount](driverkit/iouserclientmethodarguments/scalaroutputcount.md)
- [structureOutput](driverkit/iouserclientmethodarguments/structureoutput.md)
- [structureOutputDescriptor](driverkit/iouserclientmethodarguments/structureoutputdescriptor.md)