Decode FNC Symbols

The GS1 association uses FNC symbols to manage decoding for Code 128 and other barcode types. There are four types of FNC symbols (FNC1-4), with FNC1 being the most common, used for GS1 Application Identifier (AI) marking. When the library detects a barcode that does not match any GS1 type (e.g., Code 128 or GS1 Code 128), the decoder outputs FNC symbols as “”. These messages can be removed from the recognition results by setting the StripFNC property to false.

The following code snippet demonstrates how to handle FNC symbols when reading a Code 128 barcode as shown below.

How to get BarCodeInstance

// Create barcode
var gen = new BarCodeInstance.BarcodeGenerator("Code128", "Aspose<FNC1><FNC2><FNC3>");
gen.Parameters.Barcode.XDimension = "2px";
document.getElementById("img").src = gen.GenerateBarCodeImage(); // Display the barcode image

// Read barcode image with StripFNC set to false
console.log("ReadWithStripFNC:");
console.log("StripFNC: false");
var read = new BarCodeInstance.BarCodeReader(gen.GenerateBarCodeImage(), "Code128");
read.BarcodeSettings.StripFNC = false;
read.ReadBarCodes();
for (var i = 0; i < reader.FoundCount; i++) {
    var result = reader.FoundBarCodes(i);
    console.log(`CodeType: ${result.CodeType}`);
    console.log(`CodeText: ${result.CodeText}`);
}
read.delete();

// Read barcode image with StripFNC set to true
console.log("StripFNC: true");
var read = new BarCodeInstance.BarCodeReader(gen.GenerateBarCodeImage(), "Code128");
read.BarcodeSettings.StripFNC = true;
read.ReadBarCodes();
for (var i = 0; i < reader.FoundCount; i++) {
    var result = reader.FoundBarCodes(i);
    console.log(`CodeType: ${result.CodeType}`);
    console.log(`CodeText: ${result.CodeText}`);
}

gen.delete();
read.delete();