接口名	描述
decode(inputImage: InputImage, options?: scanBarcode.ScanOptions): Promise<Array<scanBarcode.ScanResult>>	启动图片识码，通过InputImage传入图片信息，通过ScanOptions进行识码参数设置（options为可选参数），使用Promise异步回调返回识码结果。
decode(inputImage: InputImage, options: scanBarcode.ScanOptions, callback: AsyncCallback<Array<scanBarcode.ScanResult>>): void	启动图片识码，通过InputImage传入图片信息，通过ScanOptions进行识码参数设置，使用Callback异步回调返回识码结果。
decode(inputImage: InputImage, callback: AsyncCallback<Array<scanBarcode.ScanResult>>): void	启动图片识码，通过InputImage传入图片信息，使用Callback异步回调返回识码结果。

开发步骤

图片识码接口支持识别图库中的条形码，二维码以及MULTIFUNCTIONAL CODE，并返回图片中码类型，码值、码位置（码图最小外接矩形左上角和右下角的坐标）等信息。

为了方便开发者接入，我们提供了详细的样例工程供参考，推荐参考示例工程接入。

以下示例为调用图片识码的decode接口获取码图信息。

导入图片识码接口和相关接口模块，该接口提供了图片识码参数和方法，导入方法如下。

// 导入图片识码需要的日志和PhotoViewPicker模块
import { scanCore, scanBarcode, detectBarcode } from '@kit.ScanKit';
import { photoAccessHelper } from '@kit.MediaLibraryKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
import { BusinessError } from '@kit.BasicServicesKit';

调用decode接口解析码图。

通过Promise回调函数得到扫码结果，InputImage对象中uri参数推荐通过PhotoViewPicker方式获取。

@Entry
@Component
struct DetectPage {
  build() {
    Column() {
      Button('Promise with options')
        .backgroundColor($r('sys.color.ohos_id_color_button_normal'))
        .fontColor($r('sys.color.ohos_id_color_text_primary_activated'))
        .align(Alignment.Center)
        .type(ButtonType.Capsule)
        .width('90%')
        .margin({ bottom: 12 })
        .onClick(() => {
          // 定义识码参数options
          const options: scanBarcode.ScanOptions = {
            scanTypes: [scanCore.ScanType.ALL],
            enableMultiMode: true
          };
          // 通过PhotoViewPicker拉起图库并选择图片
          const photoOption = new photoAccessHelper.PhotoSelectOptions();
          photoOption.MIMEType = photoAccessHelper.PhotoViewMIMETypes.IMAGE_TYPE;
          photoOption.maxSelectNumber = 1;
          const photoPicker = new photoAccessHelper.PhotoViewPicker();
          photoPicker.select(photoOption).then((data) => {
            if (!data.photoUris || data.photoUris.length === 0) {
              hilog.error(0x0001, '[Scan Sample]', 'Failed to get photoUris');
              return;
            }
            // 定义识码参数inputImage，其中uri为PhotoViewPicker选择的图片路径
            const inputImage: detectBarcode.InputImage = { uri: data.photoUris[0] };
            try {
              // 调用图片识码接口
              detectBarcode.decode(inputImage, options).then((data: Array<scanBarcode.ScanResult>) => {
                hilog.info(0x0001, '[Scan Sample]',
                  `Succeeded in getting ScanResult by promise with options, result length: ${data.length}`);
              }).catch((err: BusinessError) => {
                hilog.error(0x0001, '[Scan Sample]',
                  `Failed to get ScanResult by promise with options. Code: ${err.code}, message: ${err.message}`);
              });
            } catch (err) {
              hilog.error(0x0001, '[Scan Sample]',
                `Failed to detectBarcode. Code: ${err.code}, message: ${err.message}`);
            }
          }).catch((err: BusinessError) => {
            hilog.error(0x0001, '[Scan Sample]',
              `Failed to select a photo. Code: ${err.code}, message: ${err.message}`);
          });
        })
    }
    .width('100%')
    .height('100%')
    .alignItems(HorizontalAlign.Center)
    .justifyContent(FlexAlign.Center)
  }
}

通过Callback回调函数得到扫码结果，InputImage对象中uri参数推荐通过PhotoViewPicker方式获取。

@Entry
@Component
struct DetectPage {
  build() {
    Column() {
      Button('Callback with options')
        .backgroundColor($r('sys.color.ohos_id_color_button_normal'))
        .fontColor($r('sys.color.ohos_id_color_text_primary_activated'))
        .align(Alignment.Center)
        .type(ButtonType.Capsule)
        .width('90%')
        .margin({ bottom: 12 })
        .onClick(() => {
          // 定义识码参数options
          const options: scanBarcode.ScanOptions = {
            scanTypes: [scanCore.ScanType.ALL],
            enableMultiMode: true,
            enableAlbum: true
          };
          // 通过PhotoViewPicker拉起图库并选择图片
          const photoOption = new photoAccessHelper.PhotoSelectOptions();
          photoOption.MIMEType = photoAccessHelper.PhotoViewMIMETypes.IMAGE_TYPE;
          photoOption.maxSelectNumber = 1;
          const photoPicker = new photoAccessHelper.PhotoViewPicker();
          photoPicker.select(photoOption).then((data) => {
            if (!data.photoUris || data.photoUris.length === 0) {
              hilog.error(0x0001, '[Scan Sample]', 'Failed to get photoUris');
              return;
            }
            // 定义识码参数inputImage，其中uri为PhotoViewPicker选择的图片路径
            const inputImage: detectBarcode.InputImage = { uri: data.photoUris[0] };
            try {
              // 调用图片识码接口
              detectBarcode.decode(inputImage, options,
                (err: BusinessError, data: Array<scanBarcode.ScanResult>) => {
                  if (err && err.code) {
                    hilog.error(0x0001, '[Scan Sample]',
                      `Failed to get ScanResult by callback with options. Code: ${err.code}, message: ${err.message}`);
                    return;
                  }
                  hilog.info(0x0001, '[Scan Sample]',
                    `Succeeded in getting ScanResult by callback with options, result length: ${data.length}`);
                });
            } catch (err) {
              hilog.error(0x0001, '[Scan Sample]',
                `Failed to detectBarcode. Code: ${err.code}, message: ${err.message}`);
            }
          }).catch((err: BusinessError) => {
            hilog.error(0x0001, '[Scan Sample]',
              `Failed to select a photo. Code: ${err.code}, message: ${err.message}`);
          });
        })
    }
    .width('100%')
    .height('100%')
    .alignItems(HorizontalAlign.Center)
    .justifyContent(FlexAlign.Center)
  }
}

模拟器开发

支持模拟器开发，模拟器使用指导请参见使用模拟器运行应用。

目录

识别本地图片

场景介绍

业务流程

接口说明

开发步骤

模拟器开发