HarmonyOS 相机预览尺寸设置

1、可通过此接口设置分辨率

let previewProfilesObj: camera.Profile = previewProfiles[0];
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2、获取预览数据可通过

receiver.on('imageArrival', () => {
  console.error("imageArrival callback");
  receiver.readNextImage((err, nextImage: image.Image) => {
    let a = nextImage.format
    nextImage.getComponent(image.ComponentType.JPEG, async (err, imgComponent: image.Component) => {
      if (err || imgComponent === undefined) {
        return;
      }
      this.saveImageToFile(imgComponent.byteBuffer);
      if (imgComponent.byteBuffer as ArrayBuffer) {
        let sourceOptions: image.SourceOptions = {
          sourceDensity: 120,
          sourcePixelFormat: 8, // NV21
          sourceSize: {
            height: this.previewProfilesObj2!.size.height,
            width: this.previewProfilesObj2!.size.width
          },
        }
        let imageResource = image.createImageSource(imgComponent.byteBuffer, sourceOptions);
        let imagePackerApi = image.createImagePacker();
        let packOpts: image.PackingOption = { format: "image/jpeg", quality: 98 };
        const filePath: string = getContext().cacheDir + "/image.jpg";
        let file = fs.openSync(filePath, fs.OpenMode.CREATE | fs.OpenMode.READ_WRITE);
        imagePackerApi.packToFile(imageResource, file.fd, packOpts).then(() => {
          console.error('pack success: ' + filePath);
        }).catch((error: BusinessError) => {
          console.error('Failed to pack the image. And the error is: ' + error);
        })
        imageResource.createPixelMap({editable:true,desiredPixelFormat:image.PixelMapFormat.NV21}).then((res)=>{
          this.imgUrl = res;
        });
      } else {
        return;
      }
      nextImage.release();
    })
  })
})
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