One-dimensional (1D) barcodes are made up of lines and spaces of various widths that create specific patterns.
The following table describes the specific characteristics of the barcodes per type.
One-dimensional Barcodes support the
ShowText common setting. When
ShowText is set to
true, the Barcode shows the text together with the bars.
When the text is displayed, you can also align it horizontally by using the
TextAlign property of the
You can also use the
VerticalAlign property of the
Style object to align the Barcode vertically.
The one-dimensional Code128 barcode is subject to the following specifics:
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 may switch between these subsets in the middle of a barcode to produce a shorter generated sequence.
For example, if you have the input string
ABCD part of the string will be encoded by 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. To disable this behavior, explicitly specify a subset (Code128A, Code128B, or Code128C) to the
Symbology property of the Barcode report item.
Code128 can represent both ASCII characters and non-ASCII control characters. Normally, the Barcode report item automatically inserts the appropriate control characters to conform to the Code128 specification.
However, certain applications may require you to manually insert certain control characters, such as the FNC1-FNC4 functional characters. 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:
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"
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 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 have to insert it manually.
this.barcode1.Value = "1234" + "\u00F7" + "5678";
me.barcode1.Value = "1234" & ChrW(&HF7) & "5678"