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1D Barcodes

1D Barcodes

One-dimensional (1D) barcodes consists of lines and spaces of various widths that create specific patterns.


This section describes the common settings for one-dimensional barcodes.

  • ShowText - when true shows the text together with the bars. When the text is shown it can also be aligned horizontally by using the TextAlign property of the Style object and/or vertically through the VerticalAlign property of the Style object.



Additional information on Code128

  1. Code128A, Code128B and Code128C represent the A, B and C subsets of the Code128 symbology. Code128 uses an intelligent algorithm that picks automatically the appropriate subset according to the input value, and might switch between these subsets in the middle of a barcode in order to produce a shorter generated sequence. For example, if you have the input string “ABCD1234”, the “ABCD” part of the string will be encoded using the A subset, while the “1234” part will be encoded with the C subset, because Code128C uses a double-density code for numerical values, thus producing a shorter barcode as a result. If you want to disable this behavior you can specify explicitly one of the subsets: Code128A, Code128B or Code128C to the Symbology property of the barcode report item.

  2. Code128 can represent both ASCII characters and non-ASCII control characters. Normally the barcode report item inserts automatically the appropriate control characters in order to conform to the Code128 specification. However certain applications might require manual insertion of certain control characters, such as the functional characters: FNC1-FNC4. For this purpose the barcode report item assigns special Unicode values to these control characters outside the normal 0-127 ASCII code range. The following table lists all Code128 control characters and their corresponding Unicode values:

Code 128 Control Characters

Control Character Hexadecimal Decimal
Code A F4 244
Code B F5 245
Code C F6 246
FNC1 F7 247
FNC2 F8 248
FNC3 F9 249
FNC4 FA 250
Shift FB 251
Start A FC 252
Start B FD 253
Start C FE 254
Stop FF 255

For example, the following code inserts the FNC4 control character in the middle of a barcode:

this.barcode1.Value = "ABCD" + "\u00FA" + "1234";
me.barcode1.Value = "ABCD" & ChrW(&HFA) & "1234"

Additional information on GS1-128

GS1-128 is a special case of Code128. The only difference between GS1-128 and Code 128 is that GS1-128 inserts the FNC1 control character at the beginning of the barcode in order to conform to the GS1-128 specification. If you have a multi-part GS1-128 barcode which requires the FNC1 control character as a delimiter between the different parts, you should insert it manually:

this.barcode1.Value = "1234" + "\u00F7" + "5678";
me.barcode1.Value = "1234" & ChrW(&HF7) & "5678"

See Also

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