File

Description

The File object is an IoDevice object allowing to read,:ref:write <method_IoDevice_write> and remove files. In general a file is always stored on a certain storage which also predefines the absolute path to the file. A relative path (i.e. subdirectories) may be included in the file name.

› Inherits:IoDevice

Overview

Properties

error errorString fileName storage IoDevice.append IoDevice.atEnd IoDevice.autoOpen

IoDevice.bytesAvailable IoDevice.canReadLine IoDevice.deviceErrorString IoDevice.isOpen IoDevice.isWritable IoDevice.nameArgument IoDevice.pos

IoDevice.readOnly IoDevice.size IoDevice.truncate IoDevice.unbuffered Object.objectId Object.parent

Methods

remove() sync() IoDevice.close() IoDevice.flush() IoDevice.open()

IoDevice.peekAll() IoDevice.read() IoDevice.readAll() IoDevice.readLine() IoDevice.sync()

IoDevice.write() Object.deserializeProperties() Object.fromJson() Object.serializeProperties() Object.toJson()

Signals

errorOccurred() IoDevice.lineAvailableForRead() IoDevice.readyRead() Object.completed()

Enumerations

Error

Properties

error

This property holds the most recently occurred error or File.NoError if no error occurred. If the same error occurs multiple times this property does not change. Use the errorOccurred() signal to detect multiple occurrences of the same error.

› Type:Error › Signal:errorChanged() › Attributes:Readonly

errorString

This property holds the current human readable error string corresponding to the current value in the error property. It may include additional information such as failure reasons or locations.

› Type:String › Signal:errorStringChanged() › Attributes:Readonly

fileName

This property holds the name of the file. It is always relative to the storage which this file is stored on. The file name has to be set before the file is opened.

› Type:String › Signal:fileNameChanged() › Attributes:Writable

storage

This property holds a reference to the storage which the file is stored on. It has to be set before the file is opened.

› Type:Storage › Signal:storageChanged() › Attributes:Writable

Methods

remove()

This method removes the file specified by fileName and stored on storage.

› Returns:Boolean

sync()

This method calls IoDevice.flush() and tells the operating system to write all pending data to its storages. Calling this method might block the program execution for a while depending on the amount of data to be written.

Signals

errorOccurred()

This signal is emitted whenever an error has occurred, regardless of whether the error property has changed or not. In contrast to the change notification signal of the error property this signal is also emitted several times if a certain error occurs several times in succession.

Enumerations

Error

This enumeration describes all errors which can occur in File objects. The most recently occurred error is stored in the error property.

Name	Value	Description
File.NoError	0	No error occurred or was detected.
File.InvalidStorageError	1	None or invalid storage set.
File.StoragePathError	2	Error while creating directories on storage.
File.OpenError	3	Error while opening file likely due to permission problem.