QSaveFile Class Reference

\inmodule QtCore More...

#include <qsavefile.h>

Inheritance diagram for QSaveFile:

Collaboration diagram for QSaveFile:

Public Member Functions
	QSaveFile (const QString &name)
	Constructs a new file object to represent the file with the given name.
	QSaveFile (QObject *parent=nullptr)
	Constructs a new file object with the given parent.
	QSaveFile (const QString &name, QObject *parent)
	Constructs a new file object with the given parent to represent the file with the specified name.
	~QSaveFile ()
	Destroys the file object, discarding the saved contents unless commit() was called.
QString	fileName () const override
	Returns the name set by setFileName() or to the QSaveFile constructor.
void	setFileName (const QString &name)
	Sets the name of the file.
bool	open (OpenMode flags) override
	Opens the file using OpenMode mode, returning true if successful; otherwise false.
bool	commit ()
	Commits the changes to disk, if all previous writes were successful.
void	cancelWriting ()
	Cancels writing the new file.
void	setDirectWriteFallback (bool enabled)
	Allows writing over the existing file if necessary.
bool	directWriteFallback () const
	Returns true if the fallback solution for saving files in read-only directories is enabled.
Public Member Functions inherited from QFileDevice
	~QFileDevice ()
	Destroys the file device, closing it if necessary.
FileError	error () const
	Returns the file error status.
void	unsetError ()
	Sets the file's error to QFileDevice::NoError.
void	close () override
	Calls QFileDevice::flush() and closes the file.
bool	isSequential () const override
	Returns true if the file can only be manipulated sequentially; otherwise returns false.
int	handle () const
	Returns the file handle of the file.
virtual QString	fileName () const
	Returns the name of the file.
qint64	pos () const override
	\reimp
bool	seek (qint64 offset) override
	For random-access devices, this function sets the current position to pos, returning true on success, or false if an error occurred.
bool	atEnd () const override
	Returns true if the end of the file has been reached; otherwise returns false.
bool	flush ()
	Flushes any buffered data to the file.
qint64	size () const override
	Returns the size of the file.
virtual bool	resize (qint64 sz)
	Sets the file size (in bytes) sz.
virtual Permissions	permissions () const
	Returns the complete OR-ed together combination of QFile::Permission for the file.
virtual bool	setPermissions (Permissions permissionSpec)
	Sets the permissions for the file to the permissions specified.
uchar *	map (qint64 offset, qint64 size, MemoryMapFlags flags=NoOptions)
	Maps size bytes of the file into memory starting at offset.
bool	unmap (uchar *address)
	Unmaps the memory address.
QDateTime	fileTime (QFileDevice::FileTime time) const
bool	setFileTime (const QDateTime &newDate, QFileDevice::FileTime fileTime)
Public Member Functions inherited from QIODevice
	QIODevice ()
	Constructs a QIODevice object.
	QIODevice (QObject *parent)
	Constructs a QIODevice object with the given parent.
virtual	~QIODevice ()
	The destructor is virtual, and QIODevice is an abstract base class.
QIODeviceBase::OpenMode	openMode () const
	Returns the mode in which the device has been opened; i.e.
void	setTextModeEnabled (bool enabled)
	If enabled is true, this function sets the \l Text flag on the device; otherwise the \l Text flag is removed.
bool	isTextModeEnabled () const
	Returns true if the \l Text flag is enabled; otherwise returns false.
bool	isOpen () const
	Returns true if the device is open; otherwise returns false.
bool	isReadable () const
	Returns true if data can be read from the device; otherwise returns false.
bool	isWritable () const
	Returns true if data can be written to the device; otherwise returns false.
virtual bool	isSequential () const
	Returns true if this device is sequential; otherwise returns false.
int	readChannelCount () const
int	writeChannelCount () const
int	currentReadChannel () const
void	setCurrentReadChannel (int channel)
int	currentWriteChannel () const
void	setCurrentWriteChannel (int channel)
virtual bool	open (QIODeviceBase::OpenMode mode)
	Opens the device and sets its OpenMode to mode.
virtual void	close ()
	First emits aboutToClose(), then closes the device and sets its OpenMode to NotOpen.
virtual qint64	pos () const
	For random-access devices, this function returns the position that data is written to or read from.
virtual qint64	size () const
	For open random-access devices, this function returns the size of the device.
virtual bool	seek (qint64 pos)
	For random-access devices, this function sets the current position to pos, returning true on success, or false if an error occurred.
virtual bool	atEnd () const
	Returns true if the current read and write position is at the end of the device (i.e.
virtual bool	reset ()
	Seeks to the start of input for random-access devices.
virtual qint64	bytesAvailable () const
	Returns the number of bytes that are available for reading.
virtual qint64	bytesToWrite () const
	For buffered devices, this function returns the number of bytes waiting to be written.
qint64	read (char *data, qint64 maxlen)
	Reads at most maxSize bytes from the device into data, and returns the number of bytes read.
QByteArray	read (qint64 maxlen)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Reads at most maxSize bytes from the device, and returns the data read as a QByteArray.
QByteArray	readAll ()
	Reads all remaining data from the device, and returns it as a byte array.
qint64	readLine (char *data, qint64 maxlen)
	This function reads a line of ASCII characters from the device, up to a maximum of maxSize - 1 bytes, stores the characters in data, and returns the number of bytes read.
QByteArray	readLine (qint64 maxlen=0)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Reads a line from the device, but no more than maxSize characters, and returns the result as a byte array.
virtual bool	canReadLine () const
	Returns true if a complete line of data can be read from the device; otherwise returns false.
void	startTransaction ()
void	commitTransaction ()
void	rollbackTransaction ()
bool	isTransactionStarted () const
qint64	write (const char *data, qint64 len)
	Writes at most maxSize bytes of data from data to the device.
qint64	write (const char *data)
qint64	write (const QByteArray &data)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Writes the content of data to the device.
qint64	peek (char *data, qint64 maxlen)
QByteArray	peek (qint64 maxlen)
qint64	skip (qint64 maxSize)
virtual bool	waitForReadyRead (int msecs)
	Blocks until new data is available for reading and the readyRead() signal has been emitted, or until msecs milliseconds have passed.
virtual bool	waitForBytesWritten (int msecs)
	For buffered devices, this function waits until a payload of buffered written data has been written to the device and the bytesWritten() signal has been emitted, or until msecs milliseconds have passed.
void	ungetChar (char c)
	Puts the character c back into the device, and decrements the current position unless the position is 0.
bool	putChar (char c)
	Writes the character c to the device.
bool	getChar (char *c)
	Reads one character from the device and stores it in c.
QString	errorString () const
	Returns a human-readable description of the last device error that occurred.
Public Member Functions inherited from QObject
Q_INVOKABLE	QObject (QObject *parent=nullptr)
	Constructs an object with parent object parent.
virtual	~QObject ()
	Destroys the object, deleting all its child objects.
virtual bool	event (QEvent *event)
	This virtual function receives events to an object and should return true if the event e was recognized and processed.
virtual bool	eventFilter (QObject *watched, QEvent *event)
	Filters events if this object has been installed as an event filter for the watched object.
QString	objectName () const
Q_WEAK_OVERLOAD void	setObjectName (const QString &name)
	Sets the object's name to name.
void	setObjectName (QAnyStringView name)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
QBindable< QString >	bindableObjectName ()
bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false.
bool	isWindowType () const
	Returns true if the object is a window; otherwise returns false.
bool	isQuickItemType () const
	Returns true if the object is a QQuickItem; otherwise returns false.
bool	signalsBlocked () const noexcept
	Returns true if signals are blocked; otherwise returns false.
bool	blockSignals (bool b) noexcept
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it).
QThread *	thread () const
	Returns the thread in which the object lives.
void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children.
int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)
	This is an overloaded function that will start a timer of type timerType and a timeout of interval milliseconds.
int	startTimer (std::chrono::milliseconds time, Qt::TimerType timerType=Qt::CoarseTimer)
void	killTimer (int id)
	Kills the timer with timer identifier, id.
template<typename T >
T	findChild (const QString &aName=QString(), Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns the child of this object that can be cast into type T and that is called name, or \nullptr if there is no such object.
template<typename T >
QList< T >	findChildren (const QString &aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects.
template<typename T >
QList< T >	findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
const QObjectList &	children () const
	Returns a list of child objects.
void	setParent (QObject *parent)
	Makes the object a child of parent.
void	installEventFilter (QObject *filterObj)
	Installs an event filter filterObj on this object.
void	removeEventFilter (QObject *obj)
	Removes an event filter object obj from this object.
QMetaObject::Connection	connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const
bool	disconnect (const char *signal=nullptr, const QObject *receiver=nullptr, const char *member=nullptr) const
bool	disconnect (const QObject *receiver, const char *member=nullptr) const
void	dumpObjectTree () const
	Dumps a tree of children to the debug output.
void	dumpObjectInfo () const
	Dumps information about signal connections, etc.
bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value.
bool	setProperty (const char *name, QVariant &&value)
QVariant	property (const char *name) const
	Returns the value of the object's name property.
QList< QByteArray >	dynamicPropertyNames () const
QBindingStorage *	bindingStorage ()
const QBindingStorage *	bindingStorage () const
QObject *	parent () const
	Returns a pointer to the parent object.
bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false.

Protected Member Functions
qint64	writeData (const char *data, qint64 len) override
	\reimp
Protected Member Functions inherited from QFileDevice
	QFileDevice ()
	QFileDevice (QObject *parent)
	QFileDevice (QFileDevicePrivate &dd, QObject *parent=nullptr)
qint64	readData (char *data, qint64 maxlen) override
	\reimp
qint64	writeData (const char *data, qint64 len) override
	\reimp
qint64	readLineData (char *data, qint64 maxlen) override
	\reimp
Protected Member Functions inherited from QIODevice
	QIODevice (QIODevicePrivate &dd, QObject *parent=nullptr)
virtual qint64	readData (char *data, qint64 maxlen)=0
	Reads up to maxSize bytes from the device into data, and returns the number of bytes read or -1 if an error occurred.
virtual qint64	readLineData (char *data, qint64 maxlen)
	Reads up to maxSize characters into data and returns the number of characters read.
virtual qint64	skipData (qint64 maxSize)
virtual qint64	writeData (const char *data, qint64 len)=0
	Writes up to maxSize bytes from data to the device.
void	setOpenMode (QIODeviceBase::OpenMode openMode)
	Sets the OpenMode of the device to openMode.
void	setErrorString (const QString &errorString)
	Sets the human readable description of the last device error that occurred to str.
Protected Member Functions inherited from QObject
QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns \nullptr.
int	senderSignalIndex () const
int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal.
bool	isSignalConnected (const QMetaMethod &signal) const
virtual void	timerEvent (QTimerEvent *event)
	This event handler can be reimplemented in a subclass to receive timer events for the object.
virtual void	childEvent (QChildEvent *event)
	This event handler can be reimplemented in a subclass to receive child events.
virtual void	customEvent (QEvent *event)
	This event handler can be reimplemented in a subclass to receive custom events.
virtual void	connectNotify (const QMetaMethod &signal)
virtual void	disconnectNotify (const QMetaMethod &signal)
	QObject (QObjectPrivate &dd, QObject *parent=nullptr)
Protected Member Functions inherited from QIODeviceBase
	~QIODeviceBase ()=default

Private Member Functions
void	close () override
	\reimp This method has been made private so that it cannot be called, in order to prevent mistakes.

Additional Inherited Members
Public Types inherited from QFileDevice
enum	FileError {   NoError = 0 , ReadError = 1 , WriteError = 2 , FatalError = 3 ,   ResourceError = 4 , OpenError = 5 , AbortError = 6 , TimeOutError = 7 ,   UnspecifiedError = 8 , RemoveError = 9 , RenameError = 10 , PositionError = 11 ,   ResizeError = 12 , PermissionsError = 13 , CopyError = 14 }
	This enum describes the errors that may be returned by the error() function. More...
enum	FileTime { FileAccessTime , FileBirthTime , FileMetadataChangeTime , FileModificationTime }
enum	Permission {   ReadOwner = 0x4000 , WriteOwner = 0x2000 , ExeOwner = 0x1000 , ReadUser = 0x0400 ,   WriteUser = 0x0200 , ExeUser = 0x0100 , ReadGroup = 0x0040 , WriteGroup = 0x0020 ,   ExeGroup = 0x0010 , ReadOther = 0x0004 , WriteOther = 0x0002 , ExeOther = 0x0001 }
	This enum is used by the permission() function to report the permissions and ownership of a file. More...
enum	FileHandleFlag { AutoCloseHandle = 0x0001 , DontCloseHandle = 0 }
	This enum is used when opening a file to specify additional options which only apply to files and not to a generic QIODevice. More...
enum	MemoryMapFlag { NoOptions = 0 , MapPrivateOption = 0x0001 }
Public Types inherited from QIODeviceBase
enum	OpenModeFlag {   NotOpen = 0x0000 , ReadOnly = 0x0001 , WriteOnly = 0x0002 , ReadWrite = ReadOnly | WriteOnly ,   Append = 0x0004 , Truncate = 0x0008 , Text = 0x0010 , Unbuffered = 0x0020 ,   NewOnly = 0x0040 , ExistingOnly = 0x0080 }
	This enum is used with QIODevice::open() to describe the mode in which a device is opened. More...
Public Slots inherited from QObject
void	deleteLater ()
	\threadsafe
Signals inherited from QIODevice
void	readyRead ()
	This signal is emitted once every time new data is available for reading from the device's current read channel.
void	channelReadyRead (int channel)
void	bytesWritten (qint64 bytes)
	This signal is emitted every time a payload of data has been written to the device's current write channel.
void	channelBytesWritten (int channel, qint64 bytes)
void	aboutToClose ()
	This signal is emitted when the device is about to close.
void	readChannelFinished ()
Signals inherited from QObject
void	destroyed (QObject *=nullptr)
	This signal is emitted immediately before the object obj is destroyed, after any instances of QPointer have been notified, and cannot be blocked.
void	objectNameChanged (const QString &objectName, QPrivateSignal)
	This signal is emitted after the object's name has been changed.
Static Public Member Functions inherited from QObject
static QMetaObject::Connection	connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection)
	\threadsafe
static QMetaObject::Connection	connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)
template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const typename QtPrivate::ContextTypeForFunctor< Func2 >::ContextType *context, Func2 &&slot, Qt::ConnectionType type=Qt::AutoConnection)
template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 &&slot)
static bool	disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member)
	\threadsafe
static bool	disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member)
static bool	disconnect (const QMetaObject::Connection &)
	Disconnect a connection.
template<typename Func1 , typename Func2 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object *receiver, Func2 slot)
template<typename Func1 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const QObject *receiver, void **zero)
Protected Attributes inherited from QObject
QScopedPointer< QObjectData >	d_ptr
Properties inherited from QObject
QString	objectName
	the name of this object
Related Symbols inherited from QObject
template< class T > T	qobject_cast (const QObject *object)
	Returns the given object cast to type T if the object is of type T (or of a subclass); otherwise returns \nullptr.
template< typename T > T	qFindChildqFindChildren (const QObject *obj, const QString &name)()
template< typename T > QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()
	QObjectList
	\macro Q_CLASSINFO(Name, Value)

Detailed Description

\inmodule QtCore

The QSaveFile class provides an interface for safely writing to files.

\reentrant

Since

5.1

QSaveFile is an I/O device for writing text and binary files, without losing existing data if the writing operation fails.

While writing, the contents will be written to a temporary file, and if no error happened, commit() will move it to the final file. This ensures that no data at the final file is lost in case an error happens while writing, and no partially-written file is ever present at the final location. Always use QSaveFile when saving entire documents to disk.

QSaveFile automatically detects errors while writing, such as the full partition situation, where write() cannot write all the bytes. It will remember that an error happened, and will discard the temporary file in commit().

Much like with QFile, the file is opened with open(). Data is usually read and written using QDataStream or QTextStream, but you can also call the QIODevice-inherited functions read(), readLine(), readAll(), write().

Unlike QFile, calling close() is not allowed. commit() replaces it. If commit() was not called and the QSaveFile instance is destroyed, the temporary file is discarded.

To abort saving due to an application error, call cancelWriting(), so that even a call to commit() later on will not save.

See also

QTextStream, QDataStream, QFileInfo, QDir, QFile, QTemporaryFile

Definition at line 23 of file qsavefile.h.

Constructor & Destructor Documentation

QSaveFile() [1/3]

QSaveFile::QSaveFile ( const QString &  name )

explicit

Constructs a new file object to represent the file with the given name.

Definition at line 84 of file qsavefile.cpp.

References d.

QSaveFile() [2/3]

QSaveFile::QSaveFile ( QObject *  parent = nullptr )

explicit

Constructs a new file object with the given parent.

Definition at line 94 of file qsavefile.cpp.

QSaveFile() [3/3]

QSaveFile::QSaveFile ( const QString &  name, QObject *  parent  )

explicit

Constructs a new file object with the given parent to represent the file with the specified name.

Definition at line 102 of file qsavefile.cpp.

References d.

~QSaveFile()

QSaveFile::~QSaveFile

(

)

Destroys the file object, discarding the saved contents unless commit() was called.

Definition at line 113 of file qsavefile.cpp.

References QFileDevice::close(), and d.

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Member Function Documentation

cancelWriting()

void QSaveFile::cancelWriting

(

)

Cancels writing the new file.

If the application changes its mind while saving, it can call cancelWriting(), which sets an error code so that commit() will discard the temporary file.

Alternatively, it can simply make sure not to call commit().

Further write operations are possible after calling this method, but none of it will have any effect, the written file will be discarded.

This method has no effect when direct write fallback is used. This is the case when saving over an existing file in a readonly directory: no temporary file can be created, so the existing file is overwritten no matter what, and cancelWriting() cannot do anything about that, the contents of the existing file will be lost.

See also

commit()

Definition at line 342 of file qsavefile.cpp.

References d, QIODevice::isOpen(), and QFileDevice::WriteError.

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close()

void QSaveFile::close ( )

overrideprivatevirtual

\reimp This method has been made private so that it cannot be called, in order to prevent mistakes.

In order to finish writing the file, call commit(). If instead you want to abort writing, call cancelWriting().

Reimplemented from QFileDevice.

Definition at line 272 of file qsavefile.cpp.

References qFatal.

commit()

bool QSaveFile::commit

(

)

Commits the changes to disk, if all previous writes were successful.

It is mandatory to call this at the end of the saving operation, otherwise the file will be discarded.

If an error happened during writing, deletes the temporary file and returns false. Otherwise, renames it to the final fileName and returns true on success. Finally, closes the device.

See also

cancelWriting()

Definition at line 289 of file qsavefile.cpp.

References QFileDevice::close(), d, fileName(), QIODevice::isOpen(), QFileDevice::NoError, Q_ASSERT, qUtf16Printable, and qWarning.

Referenced by QNetworkDiskCachePrivate::storeItem(), and QV4::CompiledData::SaveableUnitPointer::writeDataToFile().

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directWriteFallback()

bool QSaveFile::directWriteFallback

(

)

const

Returns true if the fallback solution for saving files in read-only directories is enabled.

See also

setDirectWriteFallback()

Definition at line 403 of file qsavefile.cpp.

References d.

fileName()

QString QSaveFile::fileName ( ) const

overridevirtual

Returns the name set by setFileName() or to the QSaveFile constructor.

See also

setFileName()

Reimplemented from QFileDevice.

Definition at line 129 of file qsavefile.cpp.

Referenced by commit(), and open().

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open()

bool QSaveFile::open ( OpenMode  mode )

override

Opens the file using OpenMode mode, returning true if successful; otherwise false.

Important: the mode must include QIODevice::WriteOnly. It may also have additional flags, such as QIODevice::Text and QIODevice::Unbuffered.

QIODevice::ReadWrite, QIODevice::Append, QIODevice::NewOnly and QIODevice::ExistingOnly are not supported at the moment.

See also

QIODevice::OpenMode, setFileName()

Definition at line 157 of file qsavefile.cpp.

References QIODeviceBase::Append, QString::arg(), arg, QAbstractFileEngine::create(), d, QIODeviceBase::ExistingOnly, QFileInfo::exists(), fileName(), QFileInfo::filePath(), initialize(), QFileInfo::isDir(), QIODevice::isOpen(), QFileInfo::isSymLink(), QFileInfo::isWritable(), QIODeviceBase::NewOnly, QFileDevice::NoError, QIODevice::open(), QFileDevice::OpenError, QFileInfo::permissions(), qUtf16Printable, qWarning, QIODeviceBase::ReadOnly, QFileInfo::setFile(), QFileDevice::setPermissions(), QFileInfo::symLinkTarget(), QDir::toNativeSeparators(), QIODeviceBase::Unbuffered, QFileDevice::unsetError(), QFileDevice::UnspecifiedError, QTemporaryFileEngine::Win32NonShared, QFileDevice::WriteError, and QIODeviceBase::WriteOnly.

Referenced by QNetworkDiskCachePrivate::storeItem(), and QV4::CompiledData::SaveableUnitPointer::writeDataToFile().

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setDirectWriteFallback()

void QSaveFile::setDirectWriteFallback

(

bool

enabled

)

Allows writing over the existing file if necessary.

QSaveFile creates a temporary file in the same directory as the final file and atomically renames it. However this is not possible if the directory permissions do not allow creating new files. In order to preserve atomicity guarantees, open() fails when it cannot create the temporary file.

In order to allow users to edit files with write permissions in a directory with restricted permissions, call setDirectWriteFallback() with enabled set to true, and the following calls to open() will fallback to opening the existing file directly and writing into it, without the use of a temporary file. This does not have atomicity guarantees, i.e. an application crash or for instance a power failure could lead to a partially-written file on disk. It also means cancelWriting() has no effect, in such a case.

Typically, to save documents edited by the user, call setDirectWriteFallback(true), and to save application internal files (configuration files, data files, ...), keep the default setting which ensures atomicity.

See also

directWriteFallback()

Definition at line 391 of file qsavefile.cpp.

References d, and enabled.

setFileName()

void QSaveFile::setFileName

(

const QString &

name

)

Sets the name of the file.

The name can have no path, a relative path, or an absolute path.

See also

QFile::setFileName(), fileName()

Definition at line 140 of file qsavefile.cpp.

writeData()

qint64 QSaveFile::writeData ( const char *  data, qint64  len  )

overrideprotectedvirtual

\reimp

Reimplemented from QFileDevice.

Definition at line 354 of file qsavefile.cpp.

References d, QFileDevice::NoError, ret, and QFileDevice::writeData().

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---

The documentation for this class was generated from the following files:

• qtbase/src/corelib/io/qsavefile.h
• qtbase/src/corelib/io/qsavefile.cpp