Tutorial: Create Your First Project

This step-by-step tutorial will guide you to build a complete application that analyzes a Code 39 barcode from an image and output the value, type, location and confidence to the terminal.

Prerequisites:

Before running this tutorial, a license for Barcode Xpress for Node.js should already be installed.
- If you have run the setup script in the install folder, then you should already have an evaluation license. If not, see Registering Evaluation Licenses to install a license.

For this tutorial, you can use any text editor (vim, gedit, emacs, etc.).

Steps:

Create a new file titled BXDemo.js

Import the Barcode module:

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var bx = require('barcode-js');

Add some code to display a message that the sample is starting:

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console.log('\n...... Begin tutorial .........\n');

Create the parameters to use for recognition - namely, the input image and the language to recognize:

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var params = { input: 'filePath/fileName.bmp', type: 'code39' };

Modify the "input" image path to an image on your local system.
- Simply replace the text "/path/to/image/file.bmp" with an image on your local system.

Perform analyze on your barcode image:

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bx.analyze(params, function (err, results) { if (err) { console.error("There was an error processing this image", err); return; } results.forEach(function(result) { console.log ('Result type ' + result.type); console.log ('\t' + 'value ' + result.value); }); });

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bx.analyze(params, function (err, results) {
    if (err) {
        console.error("There was an error processing this image", err);
        return;
    }
    results.forEach(function(result) {
        console.log ('Result type ' + result.type);
        console.log ('\t' + 'value ' + result.value);
    });   
});

That’s it! Now go to the console and run your application to see the result output data:

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$ node BXDemo