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September 18, 2020 06:17
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| <apex:page > | |
| <html> | |
| <head> | |
| <script src="https://cdn.jsdelivr.net/npm/dynamsoft-javascript-barcode@7.6.0/dist/dbr.js" data-productKeys="LICENSE-KEY"></script> | |
| </head> | |
| <body> | |
| <h1>Dynamsoft JavaScript Barcode SDK</h1> | |
| <p></p> | |
| <div id="performance"></div> | |
| <input type="file" id="barcode-file" onchange="loadfile()" accept=".jpg,.jpeg,.png,.bmp" /> | |
| <div> | |
| <img id='image' /> | |
| </div> | |
| <script> | |
| var performanceReport = document.getElementById('performance'); | |
| var barcodereader; | |
| (async () => { | |
| barcodereader = await Dynamsoft.BarcodeReader.createInstance(); | |
| await barcodereader.updateRuntimeSettings('balance'); | |
| let settings = await barcodereader.getRuntimeSettings(); | |
| // settings.deblurLevel = 0; | |
| settings.expectedBarcodesCount = 20 | |
| // settings.timeout = 500 | |
| barcodereader.updateRuntimeSettings(settings); | |
| })(); | |
| var ratio = 0.6; | |
| function loadfile() { | |
| let name = document.getElementById('barcode-file'); | |
| var img = document.getElementById('image'); | |
| var reader = new FileReader(); | |
| reader.onload = function (evt) { | |
| img.onload = function () { | |
| console.log(img.width, img.height); | |
| // load image to canvas | |
| var canvas = document.createElement('canvas'); | |
| if (img.width > 1000 || img.height > 1000) { | |
| canvas.width = img.width * ratio; | |
| canvas.height = img.height * ratio; | |
| } | |
| else { | |
| canvas.width = img.width; | |
| canvas.height = img.height; | |
| } | |
| var context = canvas.getContext('2d'); | |
| context.drawImage(img, 0, 0, img.width, img.height, 0, 0, canvas.width, canvas.height); | |
| var buffer = context.getImageData(0, 0, canvas.width, canvas.height).data; | |
| let decoding_start = Date.now(); | |
| barcodereader | |
| .decodeBuffer( | |
| buffer, | |
| canvas.width, | |
| canvas.height, | |
| canvas.width * 4, | |
| Dynamsoft.EnumImagePixelFormat.IPF_ARGB_8888 | |
| ) | |
| .then((results) => { | |
| let decoding_end = Date.now(); | |
| performanceReport.innerHTML = "File name: " + name.files[0].name + ", time cost: " + (decoding_end - decoding_start) + " ms <br>"; | |
| console.log("File name: " + name.files[0].name + ", time cost: " + (decoding_end - decoding_start) + " ms"); | |
| let txts = []; | |
| try { | |
| let localization; | |
| for (var i = 0; i < results.length; ++i) { | |
| performanceReport.innerHTML += "Result: " + results[i].BarcodeText + " <br>" | |
| txts.push(results[i].BarcodeText); | |
| } | |
| let out = txts.join(', '); | |
| if (txts.length > 0) { | |
| console.log(out); | |
| } | |
| else { | |
| performanceReport.innerHTML += 'No barcode found' | |
| console.log('No barcode found'); | |
| } | |
| } catch (e) { | |
| } | |
| }); | |
| }; | |
| img.src = evt.target.result; | |
| }; | |
| reader.readAsDataURL(name.files[0]); | |
| }; | |
| </script> | |
| </body> | |
| </html> | |
| </apex:page> |
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