Reading bar codes

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Overview
Reading a bar code in a WINDEV application
Reading bar codes with a WINDEV application and using a specialized device
Reading a QR Code bar code found in an image (physical image or memory image)
Reading a bar code in a WEBDEV website
Reading a bar code in an Android application
Reading a bar code in an iPhone/iPad application

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Reading bar codes

Overview

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

In WINDEV, bar codes are read via a specific device plugged into the serial port of the computer.
For the QR Code bar codes, you also have the ability to read a bar code found in an image.
For more details, see Reading a bar code in a WINDEV application.

Reading a bar code in a WINDEV application

Reading bar codes with a WINDEV application and using a specialized device

To read a bar code via a specialized device:

Connect a specific device to the serial port of your computer (depending on the device used, check whether the keyboard is not set to uppercase characters and/or whether the device is configured for an english keyboard).
Read the value of the bar code with the following functions for managing serial ports:
- sOpen, which opens and initializes the specified serial port (or parallel port).
- sRead, which reads a string in the input buffer of the specified serial port.

The value of the bar code can be displayed in an edit control.

Note: You can also use a Bar Code control in the window editor.

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

// Declare the variables 
// Define the number of characters that must be read
nNbCharToRead is int = 13 
// Number of pending bytes in the buffer 
nNbPendingByte is int 
sBuffer is string       // Content of the buffer 
nSerialPort is int = 1 // COM1 serial port 

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

Reading a QR Code bar code found in an image (physical image or memory image)

To read a QR Code 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 QR Code bar code will be saved in this variable.
Use BCDecode to decode the QR Code.

Example to read a bar code stored in memory using a Web Camera:

// Decode a QR Code from a Camera control
s is Buffer
s = dSaveImageBMP(CAM_MyCamera, inMemory)
bc is BarCode
bc = BCDecode(s)
IF ErrorOccurred = False _AND_ bc.TypeBarCode = BC_QRCODE ...
		_AND_ bc.ContentType =  bcTypeEmail THEN
	Info("Email address: " + bc.Content)
END

Reading a bar code in a WEBDEV website

Reading a bar code in an Android application

Reading a bar code in an iPhone/iPad application

Related Examples:

Unit examples (WINDEV): The Bar Code control

[ + ] Using a Bar Code control