Qiodevice
The PySide. QIODevice provides both a common implementation and an abstract qiodevice for devices that support reading and writing of blocks of data, such as PySide. QFilePySide. QBuffer and PySide, qiodevice.
QtCreator KDevelop Solarized. 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. The current position in the file is available by calling pos. QFile and QBuffer are examples of random-access devices. The data must be read in one pass.
Qiodevice
Note: All functions in this class are reentrant. 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. You can use isSequential to determine the type of device. QIODevice emits readyRead when new data is available for reading; for example, if new data has arrived on the network or if additional data is appended to a file that you are reading from. You can call bytesAvailable to determine the number of bytes that are currently available for reading. It's common to use bytesAvailable together with the readyRead signal when programming with asynchronous devices such as QTcpSocket , where fragments of data can arrive at arbitrary points in time. QIODevice emits the bytesWritten signal every time a payload of data has been written to the device. Use bytesToWrite to determine the current amount of data waiting to be written. QIODevice provides functions that allow you to force these operations to be performed immediately, while blocking the calling thread and without entering the event loop. This allows QIODevice subclasses to be used without an event loop, or in a separate thread:. Calling these functions from the main, GUI thread, may cause your user interface to freeze. QIODevice uses these functions to implement all its convenience functions, such as getChar , readLine and write.
For random-access devices, this function sets the current position to posreturning true on success, or false if an error occurred. For unbuffered devices, qiodevice returns immediately, 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.
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.
Qiodevice
Note: All functions in this class are reentrant. 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. You can use isSequential to determine the type of device.
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For example, QProcess has a function called waitForStarted which suspends operation in the calling thread until the process has started. QFile from supporting Unbuffered on Windows. This signal is emitted when the device is about to close. Text When reading, the end-of-line terminators are translated to ' '. Connect this signal if you have operations that need to be performed before the device closes e. Reads a line from the device, but no more than maxSize characters, and returns the result as a QByteArray. See also readData , readLine , and write. QDataStream assumes all the requested information was read and therefore does not retry reading if there was a problem. Returns the thread in which the object lives. This function also has no way of indicating that more data may have been available and couldn't be read. See also bytesAvailable , read , and isSequential. Note that using this flag with ReadOnly alone. See also bytesAvailable , bytesWritten , and isSequential.
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For random-access devices, this function sets the current position to pos , returning true on success, or false if an error occurred. Returns true if the Text flag is enabled; otherwise returns false. Returns true if the current read and write position is at the end of the device i. See also isSequential and seek. Returns a list of child objects. Subclasses of PySide. Call close when you are done with the device. Sets the OpenMode of the device to openMode. Writes the content of byteArray to the device. This function is often called in conjunction with the readyRead signal. QIODevice also handles access control for you, so you can safely assume that the device is opened in write mode if writeData is called. This function should be called from any reimplementations of open or other functions that open the device.
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