HarmonyOS 鸿蒙Next二维码识别

CameraService.ets中修改

1、新增两个属性

export default class CameraService {
  xxxxx
  xxxxx
  //添加属性
  private isRun: boolean = true
  private timeId: number = 0

2、替换initPreviewFrame方法

private async initPreviewFrame() {
  let mReceiver = image.createImageReceiver(
    this.previewProfile.size.width,
    this.previewProfile.size.height,
    2000,
    8
  );
  let mSurfaceId = await mReceiver.getReceivingSurfaceId();
  this.cameraOutput = this.cameraManager.createPreviewOutput(this.previewProfile, mSurfaceId);
  this.captureSession.addOutput(this.cameraOutput);
  mReceiver.on('imageArrival', async () => {
    let imageData = await mReceiver.readNextImage();
    let imageComponent = await imageData.getComponent(4);
    let imageBuffer = imageComponent.byteBuffer;
    this.cameraLifecycleProxy.onCaptureSuccess(this.curMode, imageBuffer);
    // todo hj decode
    // let result = await this.decode(imageData, imageComponent)
    //添加
    if (this.isRun) {
      this.isRun = false
      let result = await this.decode(imageData, imageComponent)
      console.log("decodeText==" + result)
    }
    // console.log("decodeText==" + result)
    await imageData.release();
  })
}

3、修改decode方法

async decode(imageData: image.Image, imageComponent: image.Component): Promise<String | undefined> {
  try {
    let width = imageData.size.width;
    let height = imageData.size.height;
    //添加
    const int32Array = new Uint8ClampedArray(imageComponent.byteBuffer)
    // let task: taskpool.Task = new taskpool.Task(func, int32Array, width, height)
    // let luminanceSource1 = await taskpool.execute(task) as RGBLuminanceSource
    // Logger.error(this.tag,"Task.luminanceSource1==="+luminanceSource1)
    const luminanceSource = new RGBLuminanceSource(int32Array, width, height)
    // const binaryBitmap = new BinaryBitmap(new HybridBinarizer(luminanceSource))
    //添加
    const binaryBitmap = new BinaryBitmap(new HybridBinarizer(luminanceSource))
    const reader = new MultiFormatReader()
    const hints: Map<DecodeHintType, Array<BarcodeFormat>> = new Map();
    hints.set(DecodeHintType.POSSIBLE_FORMATS, [BarcodeFormat.CODABAR, BarcodeFormat.QR_CODE]);
    reader.setHints(hints);
    let result = reader.decode(binaryBitmap);
    let text = result.getText();
    //添加
    this.isRun = true
    return text
  } catch (e) {
    this.timeId = setTimeout(() => {
      this.isRun = true
    }, 100)
    console.log("decodeText.e==" + e)
  }
}