zbar::QZBar Class Reference

barcode reader Qt4 widget. More...

List of all members.

Public Slots
void	setVideoDevice (const QString &videoDevice)
	open a new video device.
void	setVideoEnabled (bool videoEnabled=true)
	enable/disable video scanning.
void	scanImage (const QImage &image)
	scan for barcodes in a QImage.
Signals
void	videoOpened (bool videoOpened)
	emitted when when a video device is opened or closed.
void	decoded (int type, const QString &data)
	emitted when a barcode is decoded from an image.
void	decodedText (const QString &text)
	emitted when a barcode is decoded from an image.
Public Member Functions
	QZBar (QWidget *parent=NULL)
	constructs a barcode reader widget with the given parent
QString	videoDevice () const
	retrieve the currently opened video device.
bool	isVideoEnabled () const
	retrieve the current video enabled state.
bool	isVideoOpened () const
	retrieve the current video opened state.
Properties
QString	videoDevice
	the currently opened video device.
bool	videoEnabled
	video device streaming state.
bool	videoOpened
	video device opened state.
QSize	sizeHint () const
int	heightForWidth (int) const
QPaintEngine *	paintEngine () const
void	attach ()
void	showEvent (QShowEvent *)
void	paintEvent (QPaintEvent *)
void	resizeEvent (QResizeEvent *)
void	changeEvent (QEvent *)
void	dragEnterEvent (QDragEnterEvent *)
void	dropEvent (QDropEvent *)
void	sizeChange ()

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Detailed Description

barcode reader Qt4 widget.

embeds a barcode reader directly into a Qt4 based GUI. the widget can process barcodes from a video source (using the QZBar::videoDevice and QZBar::videoEnabled properties) or from individual QImages supplied to the QZBar::scanImage() slot

Since:

1.5

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Member Function Documentation

QString zbar::QZBar::videoDevice

(

)

const

retrieve the currently opened video device.

Returns:

the current video device or the empty string if no device is opened

bool zbar::QZBar::isVideoEnabled

(

)

const

retrieve the current video enabled state.

Returns:

true if video scanning is currently enabled, false otherwise

bool zbar::QZBar::isVideoOpened

(

)

const

retrieve the current video opened state.

Returns:

true if video device is currently opened, false otherwise

void zbar::QZBar::setVideoDevice

(

const QString &

videoDevice

)

[slot]

open a new video device.

use an empty string to close a currently opened device.

Note:

since opening a device may take some time, this call will return immediately and the device will be opened asynchronously

void zbar::QZBar::setVideoEnabled

(

bool

videoEnabled = true

)

[slot]

enable/disable video scanning.

has no effect unless a video device is opened

void zbar::QZBar::videoOpened

(

bool

videoOpened

)

[signal]

emitted when when a video device is opened or closed.

(re)setting QZBar::videoDevice should eventually cause it to be opened or closed. any errors while streaming/scanning will also cause the device to be closed

void zbar::QZBar::decoded	(	int	type,
		const QString &	data
	)			[signal]

emitted when a barcode is decoded from an image.

the symbol type and contained data are provided as separate parameters.

void zbar::QZBar::decodedText

(

const QString &

text

)

[signal]

emitted when a barcode is decoded from an image.

the symbol type name is prefixed to the data, separated by a colon

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Property Documentation

QString zbar::QZBar::videoDevice [read, write]

the currently opened video device.

setting a new device opens it and automatically sets QZBar::videoEnabled

See also:

videoDevice(), setVideoDevice()

bool zbar::QZBar::videoEnabled [read, write]

video device streaming state.

use to pause/resume video scanning.

See also:

isVideoEnabled(), setVideoEnabled()

bool zbar::QZBar::videoOpened [read]

video device opened state.

(re)setting QZBar::videoDevice should eventually cause it to be opened or closed. any errors while streaming/scanning will also cause the device to be closed

See also:

isVideoOpened()

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

• include/zbar/QZBar.h