---
title: Output Maximum Size
framework: driverkit
role: collectionGroup
role_heading: API Collection
path: driverkit/3325606-output_maximum_size
---

# Output Maximum Size

Constant to denote a variable length structure argument to IOUserClient.

## Topics

### Getting the Maximum Size

- [kIOUserClientVariableStructureSize](driverkit/kiouserclientvariablestructuresize.md)

## See Also

### Getting Type Information

- [IOUserClientScalarArray](driverkit/iouserclientscalararray.md)
- [Scalar Array Sizes](driverkit/3325605-scalar_array_sizes.md)
- [Version Information](driverkit/3325604-version_information.md)