---
name: "qiodevicesource"
section: "3qt"
platform: "linux"
package: "qt-doc"
version: "3:2.3.1-22"
release: "Debian 3.0 (Woody)"
platforms: ["linux"]
url: "https://new.carta.tech/qiodevicesource"
---

# qiodevicesource(3qt)

\#include \<qasyncio.h\> Inherits QDataSource.

## NAME

QIODeviceSource - \

`#include <qasyncio.h>`

Inherits QDataSource.

### Public Members

**QIODeviceSource ( QIODevice \*, int** *bufsize***=4096 )** \
 **~QIODeviceSource ()** \
 **virtual int readyToSend ()** \
 **virtual void sendTo ( QDataSink \*** *sink***, int n )** \
 **virtual bool rewindable () const**\
 **virtual void enableRewind ( bool on )** \
 **virtual void rewind ()** \

## DESCRIPTION

The QIODeviceSource class is a QDataSource that draws data from a QIODevice

This class encapsulates retrieving data from a QIODevice (such as a QFile).

## MEMBER FUNCTION DOCUMENTATION

## QIODeviceSource::QIODeviceSource ( QIODevice \* device, int buffer\_size=4096 )

Constructs a QIODeviceSource from a pointer to an QIODevice. The QIODevice *must* be dynamically allocated, becomes owned by the QIODeviceSource, and will be deleted when the QIODeviceSource destructs. *buffer\_size* determines the size of buffering to use between asynchronous operations. The higher *buffer\_size,* the more efficient but the less interleaved the operation will be with other processing.

## QIODeviceSource::~QIODeviceSource ()

Destructs the QIODeviceSource, deleting the QIODevice from which it was constructed.

## void QIODeviceSource::enableRewind ( bool on ) `[virtual]`

Enables rewinding. No special action is taken.

Reimplemented from QDataSource.

## int QIODeviceSource::readyToSend () `[virtual]`

Ready until end-of-file.

Reimplemented from QDataSource.

## void QIODeviceSource::rewind () `[virtual]`

Calls reset() on the QIODevice.

Reimplemented from QDataSource.

## bool QIODeviceSource::rewindable () const `[virtual]`

All QIODeviceSource's are rewindable.

Reimplemented from QDataSource.

## void QIODeviceSource::sendTo ( QDataSink \* sink, int n ) `[virtual]`

Reads and sends a block of data.

Reimplemented from QDataSource.

## SEE ALSO

**http://doc.trolltech.com/qiodevicesource.html** **http://www.trolltech.com/faq/tech.html**

## COPYRIGHT

Copyright 1992-2001 Trolltech AS, http://www.trolltech.com.  See the license file included in the distribution for a complete license statement.

## AUTHOR

Generated automatically from the source code.

## BUGS

If you find a bug in Qt, please report it as described in **http://doc.trolltech.com/bughowto.html**. Good bug reports make our job much simpler. Thank you.

In case of content or formattting problems with this manual page, please report them to **qt-bugs@trolltech.com**. Please include the name of the manual page (qiodevicesource.3qt) and the Qt version (2.3.1).