自定义界面扫码如何增加重试机制

问题现象

调用customScan.init成功后，调用customScan.start启动相机流时抛出1000500001内部错误。

解决措施

可以尝试增加扫码相机流重试机制。

先暂停并释放相机流（customScan.stop、customScan.release），再重启相机流（customScan.init、customScan.start）。

示例代码（仅供参考）：

import { customScan, scanBarcode, scanCore } from '@kit.ScanKit';
import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
import { hilog } from '@kit.PerformanceAnalysisKit';

@Entry
@Component
struct Index {
  @State viewControl: customScan.ViewControl = {
    width: 1080,
    height: 1080,
    surfaceId: ''
  };
  private retryScanTimes = 0;
  private options: scanBarcode.ScanOptions = {
    scanTypes: [scanCore.ScanType.ALL],
    enableMultiMode: true,
    enableAlbum: true
  };
  private customScanCallbackScan: AsyncCallback<scanBarcode.ScanResult[]> =
    (err: BusinessError, data: scanBarcode.ScanResult[]) => {
      if (err && err.code !== 0) {
        hilog.error(0x0001, '[Scan Sample]',
          `An error is returned by customScan.start->CallbackScan. Code: ${err.code}`);
        // start回调，出现1000500001内部错误时触发重启相机流
        if (err.code === scanCore.ScanErrorCode.INTERNAL_ERROR) {
          this.retryCamera(err);
        }
      } else {
        hilog.info(0x0001, '[Scan Sample]', `customScan start callbackScan result size: ${data.length}`)
      }
      // 识码处理逻辑
      // ...
    }

  // 重启相机流
  retryCamera(err: BusinessError) {
    if (this.retryScanTimes < 3 && err.code === scanCore.ScanErrorCode.INTERNAL_ERROR) {
      this.retryScanTimes++;
      let timeId = setTimeout(async () => {
        hilog.info(0x0001, '[Scan Sample]',
          `Retry camera start. Times: ${this.retryScanTimes}.`);
        // 先暂停并释放相机流
        await this.releaseCamera();
        // 重启相机流
        this.startCamera();
        hilog.info(0x0001, '[Scan Sample]', 'Retry camera end.');
        clearTimeout(timeId);
      }, 100)
    }
  }

  // 启动相机流
  startCamera() {
    try {
      customScan.init(this.options);
      hilog.info(0x0001, '[Scan Sample]', 'customScan->init end');
      try {
        customScan.start(this.viewControl, this.customScanCallbackScan);
        hilog.info(0x0001, '[Scan Sample]', 'customScan->start end');
      } catch (err) {
        hilog.error(0x0001, '[Scan Sample]',
          `Failed to customScan->start. Code: ${err.code}, message: ${err.message}`);
      }
    } catch (error) {
      hilog.error(0x0001, '[Scan Sample]',
        `Failed to customScan->init. Code: ${err.code}, message: ${err.message}`);
    }
  }

  // 暂停并释放相机流
  async releaseCamera() {
    try {
      await customScan.stop();
      hilog.info(0x0001, '[Scan Sample]', 'customScan->stop end');
      try {
        await customScan.release();
        hilog.info(0x0001, '[Scan Sample]', 'customScan->release end');
      } catch (err) {
        hilog.error(0x0001, '[Scan Sample]',
          `Failed to customScan->release. Code: ${err.code}, message: ${err.message}`);
      }
    } catch (err) {
      hilog.error(0x0001, '[Scan Sample]',
        `Failed to customScan->stop. Code: ${err.code}, message: ${err.message}`);
    }
  }

  build() {
  }
}