Code 39 FAQ in VB.NET Barcode Generator SDK

Code 39 Barcode Generator Control DLL for VB.NET is a professional and easy-to-use .NET component software for creating Code 39 and other linear & 2D/Matrix barcode images in Visual Basic.NET projects with the providing of sample source code and detail manual tutorial. The barcodes embedded in VB.NET programs are displayed as Gif, Tiff, Bmp, Png or Jpeg formats or saved as Byte Stream, Bitmap or Graphic objects.

This article has detail information of Code 39 property settings in VB.NET projects using Visual Basic.NET source class method including the following aspects:

Code 39 VB.NET Sample Code:
Code39.Symbol = Terrek.Barcode.BarcodeSymbol.Code39
Code39.BarcodeData = "TRCODE39"

Extended Code 39 VB.NET Sample Code:
Code39.Symbol = Terrek.Barcode.BarcodeSymbol.Code39_Extendsion
Code39.BarcodeData = "Terrek-Code 39"

VB.NET Barcode control library is able to enable or disable barcode data in Code 39 symbol. Developers may change this option via DisplayData. Type is bool.The default is true.

The text font of Code 39 is changeable. The font used to display text in barcode image. Type is TextStyle, default is New Font("Arial", 9.0F, FontStyle.Regular). The color & space of text font are adjustable.

Code 39 VB.NET Sample Code:
Code39.DisplayData = True
Code39.TextStyle = New Font("Arial", 9.0F, FontStyle.Regular)
Code39.TextColor = Color.Black
Code39.TextSpace = 6

Code 39 is a kind of self-checking barcode symbology, check digit is optional. Set the AutoCheckSum to true, the Code 39 check digit will be calculated and appended on the symbol with Module 43; set the ShowCheckSum to true, the Code 39 checksum will be showed in human-readable text. Type is bool. Default is false.

Code 39 VB.NET Sample Code:
Code39.AutoCheckSum = True
Code39.ShowCheckSum = True

Originally, Code 39 barcode is appended by the start and stop character “*”, but with barcode generator component for VB.NET, the asterisk may be removed by setting DisplayAsterisk to false. Defalut is false.

Code 39 VB.NET Sample Code:
Code39.DisplayAsterisk = False

As the name specified, it means the ratio between wide bar and narrow bar, the value ranges from 2.0f to 3.0f. The default is 2.0f, developers may change the value through WideVSNarrow property.

Code 39 VB.NET Sample Code:
Code39.WideVSNarrow = 2.0f

Code 39 Interspace gap means the ratio between the two neighbor characters; it is the multiple of X. Default is 1.0f.

Code 39 VB.NET Sample Code:
Code39.WideVSNarrow = 2.0f

Set property MeasuringUnit for properties BarWidth, BarHeight, MarginL and MarginT. Valid values are PIXEL, CM and INCH. Default is PIXEL. With this UOM setting, users can control the whole barcode size to a unique type.

Code 39 VB.NET Sample Code:
Code39.MeasuringUnit = Terrek.Barcode.MeasuringUnit.PIXEL

The X and Y dimension size for Code 39. In barcode generator & control library, they are BarWidth and BarHeight. The whole barcode image is changed according to the adjustment of bar width and bar height. The type is float.

Code 39 VB.NET Sample Code:
Code39.BarWidth = 2
Code39.BarHeight = 80

Code 39 image size refers to the whole barcode image size including image width and image height. If the module size is unknown, you can set the ImageHeight and ImageWidth directly with the applying of ImageResize to true. The generated Code 39 is 100% compatible with ISO / IEC 16388 (2nd edition 2007-05-15).

Code 39 VB.NET Sample Code:
Code39.ImageWidth = 100
Code39.ImageHeight = 100

Increasing the width of margins around the symbol is one way to enhance the readability of the Code 39 barcode image. The barcode control library SDK set the left, right, top, and bottom margins separately with float values. The default value is 0.

Code 39 VB.NET Sample Code:
Code39.MarginL = 4
Code39.MarginR = 4
Code39.MarginT = 4
Code39.MarginB = 4

Code 39 generated in Visual Basic.NET programs with barcode control software can be displayed as Gif, Tiff, Bmp, Png, Jpeg and other image formats. Programmers may change the format using BarcodeFormat property.

Code 39 VB.NET Sample Code:
Code39.BarcodeFormat = System.Drawing.Imaging.ImageFormat.Png
Code39.SaveAsImage("D:\code39.png")

DPI (Dots per inch) is used commonly as the measure of printing resolution. The resolution of image generated by Code 39 generator SDK could be managed with DPI. Type is int. Default is 96 dpi. Set with DotsPerInch property.

Code 39 VB.NET Sample Code:
Code39.DotsPerInch = 96

The created Code 39 is flexible to change the placement in VB.NET projects with source. By customizing the BarAlign properly, the image is presented left, right or center in documents or projects. By changing Rotation property, the image can be rotated to 90, 180, and 270 degrees. The default is 0 degree.

Code 39 VB.NET Sample Code:
Code39.Rotation = Terrek.Barcode.Rotation.Degree0
Code39.BarAlign = Terrek.Barcode.BarAlign.Center

It is able to change barcode colors with barcode library software DLL using VB.NET class. Both background color and foreground color are easy to be changed by manipulating ImageColor and BarColor respectively.

Code 39 VB.NET Sample Code:
Code39.ImageColor = Color.White
Code39.BarColor = Color.Black

Any development environment that compatible with VB.NET programming is able to use this barcode control library SDK to create & print Code 39 images. And the following projects can be adopted to fulfill your barcoding in VB.NET applications. Tutorial to create & print barcode images using VB.NET.