QIODeviceBase Class

The QIODeviceBase class provides the open mode flags shared by I/O devices. More…

Header	`#include <QIODeviceBase>`
CMake	`target_link_libraries(app PRIVATE Nt::Core)`
Module	Nt Core C++ Classes
Inherited by	QIODevice

List of all members, including inherited members

Public Types

enum	OpenModeFlag
typedef	OpenMode

Detailed Description

QIODeviceBase is the base class of QIODevice. It holds the OpenModeFlag enum and the OpenMode flags type, so that they can be named through any device class, for example as QFile::ReadOnly.

See also QIODevice.

Differences from Qt

QIODeviceBase has no other members.

Member Type Documentation

typedef QIODeviceBase::OpenMode

The OpenMode type is a typedef for QFlags<OpenModeFlag>. It stores an OR combination of OpenModeFlag values.

enum QIODeviceBase::OpenModeFlag

Describes how a device is opened. The OpenMode type is a typedef for QFlags<OpenModeFlag>.

Constant	Description
`QIODeviceBase::NotOpen`	The device is not open.
`QIODeviceBase::ReadOnly`	The device is open for reading.
`QIODeviceBase::WriteOnly`	The device is open for writing. Note that this mode implies `Truncate` for files unless `Append` or `ReadOnly` is also given.
`QIODeviceBase::ReadWrite`	The device is open for reading and writing.
`QIODeviceBase::Append`	The device is opened in append mode, so that all data is written to the end of the file. Implies `WriteOnly` for files.
`QIODeviceBase::Truncate`	If possible, the device is truncated before it is opened. All earlier contents are lost. Implies `WriteOnly` for files.
`QIODeviceBase::Text`	Marks the device as a text device. QFile does not translate line endings.
`QIODeviceBase::Unbuffered`	Accepted for compatibility; devices in Nt do not change their behavior.
`QIODeviceBase::NewOnly`	Fail if the file to be opened already exists. Create and open the file only if it does not exist.
`QIODeviceBase::ExistingOnly`	Fail if the file to be opened does not exist.