---
title: bLength
framework: kernel
role: symbol
role_heading: Instance Property
path: kernel/iousbinterfacedescriptor/1546453-blength
---

# bLength

The size of the descriptor.

## Declaration

```occ
uint8_t bLength;
```

## See Also

### Getting the Properties

- [bDescriptorType](kernel/iousbinterfacedescriptor/1546203-bdescriptortype.md)
- [bInterfaceNumber](kernel/iousbinterfacedescriptor/1545982-binterfacenumber.md)
- [bAlternateSetting](kernel/iousbinterfacedescriptor/1546130-balternatesetting.md)
- [bNumEndpoints](kernel/iousbinterfacedescriptor/1546478-bnumendpoints.md)
- [bInterfaceClass](kernel/iousbinterfacedescriptor/1546292-binterfaceclass.md)
- [bInterfaceSubClass](kernel/iousbinterfacedescriptor/1546353-binterfacesubclass.md)
- [bInterfaceProtocol](kernel/iousbinterfacedescriptor/1545890-binterfaceprotocol.md)
- [iInterface](kernel/iousbinterfacedescriptor/1545956-iinterface.md)