Refer to the sample code below, which stores the first three frames of data.
let size: image.Size = {
width: 640,
height: 480
}
let receiver: image.ImageReceiver = image.createImageReceiver(size, image.ImageFormat.JPEG, 8);
receiver.on('imageArrival', () => {
console.info("imageArrival callback");
receiver.readNextImage((err: BusinessError, nextImage: image.Image) => {
if (err || nextImage === undefined) {
console.error("receiveImage -error:" + err + " nextImage:" + nextImage);
return;
}
nextImage.getComponent(image.ComponentType.JPEG, (err: BusinessError, imgComponent: image.Component) => {
if (err || imgComponent === undefined) {
console.error("receiveImage--getComponent -error:" + err + " imgComponent:" + imgComponent);
return;
}
if (imgComponent.byteBuffer as ArrayBuffer) {
let sourceOptions: image.SourceOptions = {
sourceDensity: 120,
sourcePixelFormat: 8,
sourceSize: {
height: 1080,
width: 1920
},
}
let imageResource = image.createImageSource(imgComponent.byteBuffer, sourceOptions);
let imagePackerApi = image.createImagePacker();
let packOpts: image.PackingOption = { format: "image/jpeg", quality: 90 };
const filePath: string = context.getHostContext()!.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({}).then((res) => {
this.imgUrl = res;
});
} else {
return;
}
nextImage.release();
});
});
});