HarmonyOS 二维码生成的demo

// 导入码图生成需要的图片模块、错误码模块 
import { scanCore, generateBarcode } from '@kit.ScanKit'; 
import { BusinessError } from '@kit.BasicServicesKit'; 
import { image } from '@kit.ImageKit'; 
import { hilog } from '@kit.PerformanceAnalysisKit'; 
 
@Entry 
@Component 
struct Fourth { 
  @State pixelMap: image.PixelMap | undefined = undefined 
  build() { 
    Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) { 
      Button('generateBarcode Callback').onClick(() => { 
        // 以QR码为例，码图生成参数 
        let content = 'huawei'; 
        let options: generateBarcode.CreateOptions = { 
          scanType: scanCore.ScanType.QR_CODE, 
          height: 400, 
          width: 400 
        } 
        // 码图生成接口，成功返回PixelMap格式图片 
        generateBarcode.createBarcode(content, options, (error: BusinessError, pixelMap: image.PixelMap) => { 
          if (error) { 
            hilog.error(0x0001, '[generateBarcode]', 'Callback error: %{public}s', JSON.stringify(error)); 
            return; 
          } 
          this.pixelMap = pixelMap; 
        }) 
      }) 
      // 获取生成码后显示 
      if (this.pixelMap) { 
        Image(this.pixelMap).width(300).height(300).objectFit(ImageFit.Contain) 
      } 
    } 
    .width('100%') 
    .height('100%') 
  } 
}