barcode-reader-javascript-samples/foundational-api-samples/others/debug/public/index.html at 826defc3c19995638249348dcd164b24db89db4d · Dynamsoft/barcode-reader-javascript-samples · GitHub

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<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8" />
  <meta name="description" content="Read barcodes from camera with Dynamsoft Barcode Reader. Save the processed frames for debugging." />
  <meta name="keywords" content="read barcode from camera, debug" />
  <meta name="viewport" content="width=device-width,initial-scale=1.0" />
  <title>Dynamsoft Barcode Reader Sample - Debug</title>
</head>

<body>
  <h1 style="font-size: 1.5em">Read Barcodes from Camera - Debug</h1>
  <button id="btn-start-capturing">start capturing</button>
  <button id="btn-stop-capturing">stop capturing</button>
  <br /><br />
  <label><input type="radio" name="video-settings" checked value="default" />default</label>
  <label><input type="radio" name="video-settings" value="back-camera" />back camera</label>
  <label><input type="radio" name="video-settings" value="only-video" />only video</label>
  <br /><br />
  <label><input id="cb-send-img" type="checkbox" />send image to</label><input id="ipt-server-url" placeholder="server url, default ./collect" />
  <br />
  <div id="div-ui-container" style="width: 100%; height: calc(100vh - 150px)"></div>
  <script src="https://cdn.jsdelivr.net/npm/eruda"></script>
  <script src="https://cdn.jsdelivr.net/npm/dynamsoft-barcode-reader-bundle@10.5.3000/dist/dbr.bundle.min.js"></script>
  <!-- If the network is unstable or you prefer to self-host the SDK, uncomment the line below to load it locally -->
  <!-- <script src="../../../distributables/dbr.bundle.js"></script> -->
  <script>
    eruda.init();

    Dynamsoft.Core.CoreModule.enableLogging();
    Dynamsoft.CVR.CaptureVisionRouter._onLog = console.log;
    Dynamsoft.DCE.CameraEnhancer._onLog = console.log;

    /** LICENSE ALERT - README
     * To use the library, you need to first specify a license key using the API "initLicense()" as shown below.
     */

    Dynamsoft.License.LicenseManager.initLicense("DLS2eyJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSJ9");

    /**
     * You can visit https://www.dynamsoft.com/customer/license/trialLicense?utm_source=samples&product=dbr&package=js to get your own trial license good for 30 days.
     * Note that if you downloaded this sample from Dynamsoft while logged in, the above license key may already be your own 30-day trial license.
     * For more information, see https://www.dynamsoft.com/barcode-reader/docs/web/programming/javascript/user-guide/index.html?ver=10.5.3000&cVer=true#specify-the-license&utm_source=samples or contact support@dynamsoft.com.
     * LICENSE ALERT - THE END
     */

    // Preload "BarcodeReader" module for reading barcodes. It will save time on the initial decoding by skipping the module loading.
    Dynamsoft.Core.CoreModule.loadWasm(["DBR"]);
    // // If the network is unstable or you prefer to self-host the SDK, uncomment the line below to define the root path of the engine files
    // Dynamsoft.Core.CoreModule.engineResourcePaths.rootDirectory = "../../../distributables/";
    const init = async () => {
      try {
        // Create a `CameraEnhancer` instance for camera control and a `CameraView` instance for UI control.
        const cameraView = await Dynamsoft.DCE.CameraView.createInstance();
        const cameraEnhancer = await Dynamsoft.DCE.CameraEnhancer.createInstance(cameraView);
        // Get default UI and append it to DOM.
        document.querySelector("#div-ui-container").append(cameraView.getUIElement());

        // Create a `CaptureVisionRouter` instance and set `CameraEnhancer` instance as its image source.
        const cvRouter = await Dynamsoft.CVR.CaptureVisionRouter.createInstance();
        cvRouter.setInput(cameraEnhancer);

        // Filter out unchecked and duplicate results.
        const filter = new Dynamsoft.Utility.MultiFrameResultCrossFilter();
        filter.enableResultCrossVerification("barcode", true); // Filter out unchecked barcodes.
        // Filter out duplicate barcodes within 3 seconds.
        filter.enableResultDeduplication("barcode", true);
        filter.setDuplicateForgetTime("barcode", 3000);
        await cvRouter.addResultFilter(filter);

        let ss = await cvRouter.getSimplifiedSettings("ReadBarcodes_SpeedFirst");
        ss.timeout = 100000;
        ss.minImageCaptureInterval = 100;
        ss.capturedResultItemTypes |= Dynamsoft.Core.EnumCapturedResultItemType.CRIT_ORIGINAL_IMAGE;
        await cvRouter.updateSettings("ReadBarcodes_SpeedFirst", ss);

        // Define a callback for results.
        const resultReceiver = new Dynamsoft.CVR.CapturedResultReceiver();
        let processingCount = 0;
        resultReceiver.onCapturedResultReceived = async (result) => {
          const resultItems = result.items;
          if (!resultItems.length) return;

          if (resultItems.some((item) => item.type === "barcode")) {
            Dynamsoft.DCE.Feedback.beep();
          }

          let bSendImg = !!document.getElementById("cb-send-img").checked;
          /**
           * The barcode reading speed is very fast, we must limit
           * the number of uploaded frames (4), so that it is feasible.
           */
          if (bSendImg && processingCount < 4) {
            ++processingCount;
            try {
              /**
               * The 'cvs' is the one the sdk worked on,
               * we can collect it for futher testing and debugging.
               */
              let cvs;
              for (let item of resultItems) {
                if (item.type !== Dynamsoft.Core.EnumCapturedResultItemType.CRIT_ORIGINAL_IMAGE) continue;
                const imageData = item.imageData;
                console.log(item);
                cvs = imageData.toCanvas();
              }

              let fd = new FormData();
              if (cvs != null) {
                let blob = cvs.convertToBlob
                  ? await cvs.convertToBlob()
                  : await new Promise((resolve) => {
                    cvs.toBlob((blob) => resolve(blob));
                  });
                fd.append("img", blob);
                await fetch(document.getElementById("ipt-server-url").value || "collect", {
                  method: "POST",
                  body: fd,
                });
              }
            } catch (ex) {
              console.error(ex);
            }
            --processingCount;
          }
        };
        cvRouter.addResultReceiver(resultReceiver);

        return {
          cameraView,
          cameraEnhancer,
          cvRouter,
        };
      } catch (ex) {
        let errMsg = ex.message || ex;
        console.error(errMsg);
        alert(errMsg);
      }
    };
    let pInit = init();

    document.getElementById("btn-start-capturing").addEventListener("click", async () => {
      const { cameraEnhancer, cvRouter, cameraView } = await pInit;

      // Open camera and start scanning barcode.
      await cameraEnhancer.open();
      cameraView.setScanLaserVisible(true);
      await cvRouter.startCapturing("ReadBarcodes_SpeedFirst");
    });

    document.getElementById("btn-stop-capturing").addEventListener("click", async () => {
      const { cameraEnhancer, cvRouter, cameraView } = await pInit;

      cvRouter.stopCapturing();
      cameraEnhancer.close();
      cameraView.setScanLaserVisible(false);
    });

    let switchVideoSettings = async () => {
      const { cameraEnhancer } = await pInit;

      switch (document.querySelector('input[name="video-settings"]:checked').value) {
        case "back-camera":
          await cameraEnhancer.updateVideoSettings({
            video: {
              facingMode: "environment",
            },
          });
          break;
        case "only-video":
          await cameraEnhancer.updateVideoSettings({
            video: true,
          });
          break;
        default:
          await cameraEnhancer.updateVideoSettings({
            video: {
              width: {
                ideal: 1280,
              },
              height: {
                ideal: 720,
              },
              facingMode: {
                ideal: "environment",
              },
            },
          });
      }
    };
    for (let ipt of document.querySelectorAll('input[name="video-settings"]')) {
      ipt.addEventListener("change", switchVideoSettings);
    }
  </script>
</body>

</html>