//全局初始化方法，在UIAbility的onCreate方法中初始化 AppUtil.init()  onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {    AppUtil.init(this.context);  }

ScanUtil.startScanForResult().then((scanResult) => {  let scanStr1 = JSON.stringify(scanResult, null, 2);});

let txtStr = "harmony-utils 一款高效的OpenHarmony/HarmonyOS工具包，封装了常用工具类，提供一系列简单易用的方法";let pixelMap = await ScanUtil.generateBarcode(txtStr);ImageUtil.savePixelMap(pixelMap, FileUtil.getFilesDirPath(""), "qr_code.png");

let filePath = FileUtil.getFilesDirPath("","qr_code.png");if (FileUtil.accessSync(this.filePath)) {  ScanUtil.decode(this.filePath).then((scanResult) => {    let scanStr3 = JSON.stringify(scanResult, null, 2);  })} else {  ToastUtil.showToast("请先点击generateBarcode生成二维码图片");}

//优先获取图像的YuvByteBuffer, YuvHeight, YuvWidth数据，比如获取宽高是1920*1080时let byteImg: detectBarcode.ByteImage = {  byteBuffer: YuvByteBuffer,  width: 1920,  height: 1080,  format: detectBarcode.ImageFormat.NV21};ScanUtil.decodeImage(byteImg).then((scanResult) => {  let scanStr3 = JSON.stringify(scanResult, null, 2);});

ScanUtil.onPickerScanForResult().then((scanResult) => {  let scanStr2 = JSON.stringify(scanResult, null, 2);  Utils.showSheetText(scanStr2);}).catch((err: BusinessError) => {  ToastUtil.showToast("扫码异常！");});

let canIUseScan = ScanUtil.canIUseScan();ToastUtil.showToast(`当前设备是否支持码能力：${canIUseScan}`);