---
title: readStructure
framework: kernel
role: pseudoSymbol
path: kernel/iobdmedia/1811722-readstructure
---

# readStructure

## Declaration

```occ
virtual IOReturn readStructure(
 IOMemoryDescriptor *buffer, 
 UInt8format, 
 UInt32address, 
 UInt8layer, 
 UInt8grantID ); 
```

## Parameters

- `buffer`: Buffer for the data transfer. The size of the buffer implies the size of the data transfer.
- `format`: As documented by MMC.
- `address`: As documented by MMC.
- `layer`: As documented by MMC.
- `grantID`: As documented by MMC.

## Return Value

Return Value Returns the status of the data transfer.

## Overview

Overview Issue an MMC READ DISC STRUCTURE command.

## See Also

### Miscellaneous

- [getSpeed](kernel/iobdmedia/1811688-getspeed.md)
- [readDiscInfo](kernel/iobdmedia/1811707-readdiscinfo.md)
- [readTrackInfo](kernel/iobdmedia/1811739-readtrackinfo.md)
- [reportKey](kernel/iobdmedia/1811756-reportkey.md)
- [sendKey](kernel/iobdmedia/1811776-sendkey.md)
- [setSpeed](kernel/iobdmedia/1811802-setspeed.md)
- [splitTrack](kernel/iobdmedia/1811824-splittrack.md)