Reading bar codes

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Overview
Reading a bar code in a WINDEV application
Reading a bar code in a WEBDEV website
Reading a bar code in an Android application
Direct bar code reading with an Android application
Reading a bar code in an iPhone/iPad application
Direct reading of QR Code bar codes (BCCapture function)
Direct bar code reading (Camera control)
Reading a bar code in an image

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Reading bar codes

Overview

WINDEV, WEBDEV and WINDEV Mobile allow you to create applications for reading bar codes.

In the Android applications, the bar code is read via the camera of the device.
For more details, see Reading a bar code in an Android application.
In iPhone/iPad applications, it is possible to read a wide variety of bar codes. You can:
- read the bar code via the device camera.
- read a bar code found in an image.
For more details, see Reading a bar code in an iOS application.

Reading a bar code in a WINDEV application

Reading a bar code in a WEBDEV website

Reading a bar code in an Android application

Direct bar code reading with an Android application

Two modes are available for reading bar codes:

Reading bar codes with BCCapture. This function decodes the information stored in a bar code by using the camera of the device.
Remarks:
- This function opens a new window that displays the preview from the device camera. Then, you must:
  - center the bar code to decode in the relevant area.
  - tap to read the bar code.
- In Android, the Zxing library is used for decoding bar codes (http://code.google.com/p/zxing). If this library is not on the device, it will be automatically available for download.
Reading bar codes via the Camera control.
Simply enable bar code reading in the Camera control. A specific process is run whenever the bar code is read. This process is used to get the characteristics of the bar code read in a variable of type BarCode. For more details, see Decoding bar codes using a Camera control.

Reading a bar code in an iPhone/iPad application

Direct reading of QR Code bar codes (BCCapture function)

Bar codes are read directly by BCCapture. This function decodes the information stored in a bar code by using the camera of the device.

Note: This function opens a new window that displays the camera preview stream. Then, you must:

center the bar code to decode in the relevant area.
tap to read the bar code.

The characteristics of the bar code are then stored in a variable of type BarCode. The value of the bar code is returned by the RawValue property and can be displayed in a Bar Code control.

For example:

// Capture the bar code
MyBC is BarCode
MyBC = BCCapture()

// Retrieve the content of the bar code and display it
sResult is string = MyBC.RawValue
BAC_MyBarCodeControl = sResult

Direct bar code reading (Camera control)

Bar codes are read directly using the Camera control in decoding mode.

Note: The user sets the bar code frame position. A specific process is run whenever the bar code is read. This process is used to get the characteristics of the bar code read in a variable of type BarCode. The value of the bar code is returned by the RawValue property and can be displayed in a Bar Code control.

For example:

// Decoding a Bar Code process
PROCEDURE DecodeBarCode(bc is BarCode)
// Retrieve the content of the bar code and display it
sResult is string = bc.RawValue
BAC_MyBarCodeControl = sResult

For more details, see Decoding bar codes using a Camera control.

Reading a bar code in an image

In iPhone/iPad applications, it is also possible to read the characteristics of a bar code in an image.

To read a bar code found in an image:

Select the image that contains the bar code to decode. This image can be:
- an image in an Image control.
- an image file.
- an image in memory.
Declare a BarCode variable if necessary. The characteristics of the bar code will be saved in this variable.
Use BCDecode to decode the bar code.

Example of a barcode read by a Web Camera and stored in memory:

// Decode a QR Code found in an Image control
bc is BarCode
bc = BCDecode(IMG_BarCode)
IF ErrorOccurred = False _AND_ bc.TypeBarCode = BC_QRCODE ...
		_AND_ bc.ContentType =  bcTypeEmail THEN
	Info("Email address: " + bc.Content)
END

Related Examples:

Unit examples (WINDEV): The Bar Code control

[ + ] Using a Bar Code control