![]() With the GS1-128 Barcode Generator, you can quickly and easily create GS1-128 barcodes with a variety of options, including barcode size, encoding, and error correction. GS1-128 is a global standard for encoding product information and is used by many industries such as retail, logistics, and healthcare. $label->write1DBarcode($codeString, 'C128', $x, $y, $w, $h) Īs far as the human-readable text beneath the barcode is concerned, if this doesn't display correctly for properly encoded data then you may need to raise a bug report or feature request against TCPDF.The GS1-128 Barcode Generator is an easy-to-use software solution designed to generate GS1-128 compliant barcodes for a variety of applications. I also notice that you pass C128A to the type parameter of write1DBarcode which limits the symbol to mode A (numbers, uppercase letters and control characters.) This would be terribly inefficient and is likely to result in a symbol that is too wide (or too dense when rescaled) to scan with most standard equipment used for logistics applications.Ĭode 128 supports a mode C that provides double-density compression of digits so you should use this, probably by passing type=C128C or type=C128 (auto) assuming that TCPDF's auto-encoding is any good and future symbols that you will create may need to contain letters. See here for details about encoding non-data characters such as FNC1. ( There is some doubt whether this is the case.) If it works then this is a library-specific choice and you shouldn't read much into the fact that they have chosen value 241. This assumes that the linked to answer on the support forum is correct in stating that TCPDF uses ASCII ordinal 241 to indicate an FNC1 character. How does this knowledge translate into code for TCPDF? I've never used it sorry, but this might be helpful: Note that the list of AIs provided in the GS1 General Specifications §3.2 "GS1 Application Identifiers in Numerical Order" indicates whether they require termination by an FNC1 character when followed by additional data. Since your data consists of only fixed-length AIs there are no instances where we have to terminate a variable-length field with an FNC1 separator character.The parentheses around the AIs have been omitted.The data begins with an FNC1 flag character (indicating the presence of GS1-formatted data). ![]() The "extraction" part of this answer provides background on how GS1 data is encoding within a Code 128 barcode to produce a valid GS1-128 symbol. That's a lot of items – more than eight digits worth in fact so the reader may indicate a fault! Therefore a decoder would continue to read the remaining data until the end of the code into AI (30) since there is no subsequent field terminator character (FNC1). There is no AI (3013) and unfortunately this would prefix match with the legitimate AI (30) representing an item count which is a variable-length field. You have written a code containing (3013)2675 which is invalid. There are a number of problems here that I'll work through.įirstly, you have misread the text of the original barcode which contains the fixed-length Application Identifier (AI) field (3103)2775 representing net weight.
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