---
title: IOUSBDevRequestDesc
framework: Kernel
role: symbol
role_heading: Structure
platforms: [macOS 10.8+]
path: kernel/iousbdevrequestdesc
---

# IOUSBDevRequestDesc

## Declaration

```occ
typedef struct IOUSBDevRequestDesc {
    ...
} IOUSBDevRequestDesc;
```

## Overview

Parameter block for control requests, using a memory descriptor for the data to be transferred. Only available in the kernel.

## Topics

### Instance Properties

- [bRequest](iousbdevrequestdesc/1546108-brequest.md)
- [bmRequestType](iousbdevrequestdesc/1545895-bmrequesttype.md)
- [pData](iousbdevrequestdesc/1546016-pdata.md)
- [wIndex](iousbdevrequestdesc/1546062-windex.md)
- [wLenDone](iousbdevrequestdesc/1546205-wlendone.md)
- [wLength](iousbdevrequestdesc/1545931-wlength.md)
- [wValue](iousbdevrequestdesc/1546381-wvalue.md)