Handling a Bar Code control by programming

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Bar Code control

Handling a Bar Code control by programming

Overview

Displaying a bar code in a Bar Code control

Retrieving the value of the bar code displayed in the Bar Code control

Properties specific to the Bar Code controls

See also

The Bar Code control

Handling a Bar Code control by programming

Overview

WINDEV, WEBDEV and WINDEV Mobile allow you to handle a Bar Code control by programming. To do so, use the variable of the Bar Code control in the code.

The variable of the Bar Code control corresponds to the name of the Bar Code control. This variable is a text variable.

Versions 17 and later

The Bar Code control can now be handled by programming in the Linux sites and applications.

New in version 17

The Bar Code control can now be handled by programming in the Linux sites and applications.

Versions 18 and later

This type of control is now available in the WINDEV applications in Linux.

New in version 18

This type of control is now available in the WINDEV applications in Linux.

Versions 20 and later

This type of control is now available in Windows Store apps mode.

New in version 20

This type of control is now available in Windows Store apps mode.

Versions 21 and later

This type of control is now available for the windows and reports found in the applications in Universal Windows 10 App mode.

New in version 21

This type of control is now available for the windows and reports found in the applications in Universal Windows 10 App mode.

Displaying a bar code in a Bar Code control

To display a bar code in a Bar Code control, a simple assignment is sufficient.

Some examples:

direct assignment:

BCOD_BarCodeControl = "123456789"
assignment by variable:

BCOD_BarCodeControl = Products.BarCode

Versions 16 and later
Case of QR Code bar codes:
To display a QR Code bar code in a Bar Code control, you have the ability to use a BarCodes variable.

New in version 16
Case of QR Code bar codes:
To display a QR Code bar code in a Bar Code control, you have the ability to use a BarCodes variable.

Case of QR Code bar codes:
To display a QR Code bar code in a Bar Code control, you have the ability to use a BarCodes variable.
Remark: In a window or in a page, if the control is associated with an item found in a data file, the entered value is automatically retrieved by using ScreenToFile or PageToFile. See Linking a Bar Code control to an item for more details.

Retrieving in a Bar Code control the value read by a specific device

You have the ability to read the bar codes and to display the corresponding value on the screen. To read a bar code:

Connect a specific device to the serial port of your computer.

Read the value of the bar code via the functions for managing the serial ports:


Versions 09 and later sOpen New in version 09 sOpen sOpen	Opens and initializes: a serial port. a parallel port. an infrared port.
Versions 09 and later sRead New in version 09 sRead sRead	Reads a character string in the entry buffer of the specified serial port.

Initialize the value of the bar code read in a Bar Code control corresponding to the type of the bar code read.

Example used to read a bar code with a specific device connected to the serial port COM1:

// Declare the variables
// Define the number of characters that must be read
NbCharToRead is int = 13
// Number of pending bytes in the buffer
NbPendingBytes is int
BufferPrn is string // Content of the buffer
SerialPort is int = 1 // Serial port COM1

// Open and initialize the serial port COM1
IF sOpen(SerialPort, 5000, 5000) THEN
// Read the bar code
// Retrieve the number of pending bytes
NbPendingBytes = sInEntryQueue(SerialPort)
// Retrieve the value of the bar code only
// if at least 13 characters have been read
IF NbPendingBytes >= NbCharToRead THEN
BufferPrn = sRead(SerialPort, NbPendingBytes)
// Retrieve the first 13 characters read
BufferPrn = Left(BufferPrn, 13)
// Display the value of bar code in the
// "EDT_BarCode" edit control
EDT_BarCode = BufferPrn
END
END

Retrieving the value of the bar code displayed in the Bar Code control

To retrieve the value of the bar code displayed in a Bar Code control:

perform a simple assignment.
For example:

BarCodeValue = BCOD_BarCodeControl
retrieve part of the value.
For example:

BeginningBarCode = Left(BCOD_BarCodeControl, 3)
use ..Value.

Remark: If the control is associated with a file item, the value typed is automatically retrieved by using ScreenToFile. See Linking a Bar Code control to an item for more details.

Properties specific to the Bar Code controls

The following properties are used to manage a Bar Code control by programming.


HorizontalAlignment	Allows you to find out and modify the horizontal alignment of a Bar Code control.
VerticalAlignment	Allows you to find out and modify the vertical alignment of a Bar Code control.
DndTarget	Allows you to find out and modify the behavior of the target control during Drag and Drop.
DndSource	Allows you to find out and modify the behavior of the source control during Drag and Drop.

To find out the entire list of WLanguage properties that can be used with a Bar Code control, see Properties associated with a Bar Code control.