Portability	no
Stability	no
Maintainer	claude@mathr.co.uk
Safe Haskell	None

Graphics.V4L2.Device

Description

Synopsis

Documentation

data Device Source

Device handle.

Instances

Bounded Device
Enum Device
Eq Device
Integral Device
Num Device
Ord Device
Read Device
Real Device
Show Device
Typeable Device
Storable Device
Bits Device

openDevice Source

Arguments

:: FilePath	device name
-> IO Device

Open a device. Fails with invalid argument when the device is not a V4L2 device.

closeDevice Source

Arguments

:: Device	device handle
-> IO ()

Close a device.

withDevice Source

Arguments

:: FilePath	device name
-> (Device -> IO a)	action
-> IO a

Perform an action with a device. The device will be close on exit from withDevice, whether by normal termination or by raising an exception. If closing the device raises an exception, then this exception will be raised by withDevice rather than any exception raised by the action.