Qiodevice

Note: All functions in this class are reentrant. You can then write qiodevice the device with write or putCharand read by calling either readqiodevice, readLineor readAll. Call close when you are done with the device.

You can then write to the device with write or putChar , and read by calling either read , readLine , or readAll. Call close when you are done with the device. QIODevice distinguishes between two types of devices: random-access devices and sequential devices. Random-access devices support seeking to arbitrary positions using seek. The current position in the file is available by calling pos. QFile and QBuffer are examples of random-access devices. You can use isSequential to determine the type of device.

Qiodevice

Base class for QIODevice that provides flags describing the mode in which a device is opened. This enum is used with QIODevice::open to describe the mode in which a device is opened. Certain flags, such as Unbuffered and Truncate , are meaningless when used with some subclasses. Some of these restrictions are implied by the type of device that is represented by a subclass. In other cases, the restriction may be due to the implementation, or may be imposed by the underlying platform; for example, QTcpSocket does not support Unbuffered mode, and limitations in the native API prevent QFile from supporting Unbuffered on Windows. Documentation contributions included herein are the copyrights of their respective owners. Qt and respective logos are trademarks of The Qt Company Ltd. All other trademarks are property of their respective owners. Detailed Description. Note that, for file-system subclasses e. All earlier contents of the device are lost.

For devices with no buffer, this function returns 0.

The PySide. QIODevice provides both a common implementation and an abstract interface for devices that support reading and writing of blocks of data, such as PySide. QFile , PySide. QBuffer and PySide. QIODevice pointer, allowing them to be used with various devices such as files and buffers. Before accessing the device, PySide.

More …. You can then write to the device with write or putChar , and read by calling either read , readLine , or readAll. Call close when you are done with the device. QIODevice distinguishes between two types of devices: random-access devices and sequential devices. Random-access devices support seeking to arbitrary positions using seek. The current position in the file is available by calling pos.

Qiodevice

Base class for QIODevice that provides flags describing the mode in which a device is opened. This enum is used with QIODevice::open to describe the mode in which a device is opened. Certain flags, such as Unbuffered and Truncate , are meaningless when used with some subclasses. Some of these restrictions are implied by the type of device that is represented by a subclass. In other cases, the restriction may be due to the implementation, or may be imposed by the underlying platform; for example, QTcpSocket does not support Unbuffered mode, and limitations in the native API prevent QFile from supporting Unbuffered on Windows.

Spo0pykitten

Returns the number of bytes that are available for reading. Reads at most maxSize bytes from the device into data , without side effects i. See also startTransaction and rollbackTransaction. See also open , setOpenMode Definition at line of file qiodevice. They have both a size and a current position, and they also support seeking backwards and forwards in the data stream. Random-access devices support seeking to arbitrary positions using seek. Returns true if data can be read from the device; otherwise returns false. Sets the OpenMode of the device to openMode. See also waitForBytesWritten. Truncate If possible, the device is truncated before it is opened. Returns the mode in which the device has been opened; i. The error string is also reset. QFile , this mode implies Truncate unless. See also setErrorString.

More …. We always welcome contributions to the snippet translation.

Filters events if this object has been installed as an event filter for the watched object. Note that when using a PySide. Note that unbuffered devices, which have no way of determining what can be read, always return false. Opens the device and sets its OpenMode to mode. Reads at most maxSize bytes from the device, and returns the data read as a QByteArray. The base implementation always returns true. Buffering makes functions like PySide. This function can operate without an event loop. This flag currently only affects QFile. Sets the OpenMode of the device to openMode. Use the QTextStream::seek function instead. We can optimize this, if we. QIODevice also handles access control for you, so you can safely assume that the device is opened in write mode if writeData is called. Removes an event filter object obj from this object. Subclasses can reimplement this function to improve on that.