FoxBarcodeQR

FoxBarcodeQR is a application free software and offers a barcode tool for the Visual FoxPro Community. This is a supplement ofFoxBarcode class only for QR Code barcodes.

FoxBarcodeQR use the free library BarCodeLibrary.DLL of Dario Alvarez Aranda (Mexico)

This class is an alternative solution for all developers who requested QR Code support untilFoxBarcode natively support the QR Code with gpImage2 class.

Download the latest release of FoxBarcodeQR - v.1.00 - Release 2013.02.16

Project Manager: VFPEncoding (*)

(*) VFPEncoding are  Guillermo Carrero (RIP) (Barcelona, Spain) andLuis Maria Guayan (Tucuman, Argentina)

Features

The library generates QR Codes BarCodeLibrary.DLL functionals, but you can only set the type and size of the generated image. No settings supports for error correction level.

The external library

The library BarCodeLibrary.DLL, only three functions to declare:

•  LibraryVersion: Only returns a string with the version of the library.
•  SetConfiguration: A method to set the size and type of image file to generate.
•  GenerateFile: This method is responsible for generating the image of the QR Code barcode.

Methods

FoxBarcodeQR encapsulates BarCodeLibrary.dll library functions into a single method calledQRBarcodeImage(), which receives the following parameters:

•  tcText: Text to encode
•  tcFile: Name the image file to generate. If none is specified, it generates a random file name in the Windows temporary files folder.
•  tnSize: The size of the generated image. Receives an integer between 2 and 12
  • 2 = 66 x 66 (in pixels)
  • 3 = 99 x 99
  • 4 = 132 x 132
  • 5 = 165 x 165
  • 6 = 198 x 198
  • 7 = 231 x 231
  • 8 = 264 x 264
  • 9 = 297 x 297
  • 10 = 330 x 330
  • 11 = 363 x 363
  • 12 = 396 x 396
•  tnType: The type of the generated image file. Receives an integer between 0 and 2.
  • 0 = BMP
  • 1 = JPG
  • 2 = GIP

And returns the file path of the bar code image generated.

Examples

The following example creates a image of a QR Code barcode from a size 6 (198 x 198 pixels) and PNG type.

SET PROCEDURE TO LOCFILE("FoxBarcodeQR.prg") ADDITIVE

*--- Create FoxBarcodeQR object and QR Code barcode image<
LOCAL loFbc, lcQRImage
loFbc = CREATEOBJECT("FoxBarcodeQR")
lcQRImage = loFbc.QRBarcodeImage("http://vfpx.codeplex.com/wikipage?title=FoxBarcode",,6,2)

To include a barcode on a report, you must insert an Image object and set the property with a call ControlSource QRBarcodeImage() method and is recommended to set "contents Scale, Retain shape" if the image size differs from the frame.

Important: Before you run the report and create the object FoxBarcode, you must declare the variable asPRIVATE so that it has scope in the report, as follows:

*--- Create FoxBarcodeQR private object
PRIVATE poFbc
m.poFbc = CREATEOBJECT("FoxBarcodeQR")
...REPORT FORM FoxBarcodeQR PREVIEW

Distribution

The only files needed to be distributed to FoxBarcodeQR function properly are:

• FoxBarcodeQR.prg
• BarCodeLibrary.dll

Notes on the distribution and installation of BarCodeLibrary.dll file:

File BarCodeLibrary.dll not register. It must be in the same folder as the application or in the Windows System folder.

BarCodeLibrary.dll was tested and runs on Windows XP, 7 and 8 (32 and 64 bits)

Acknowledgements

To my friend Guillermo from heaven illuminated me with this supplement to our classFoxBarcode.