I'm using qz-tray's excellent system to read USB scale data in Angular 7.
I have a read every second or so that gathers about 8 bytes which has
weight and scale status:
setInterval(this.readAgain, 1000); // called in ngOnInit()
And here's the class member:
readAgain(){
const getScaleData = async () => {
let deviceInfo = {"vendorId" : usb.vendor, "productId" :
usb.product, "usagePage" : "0x008d", "responseSize" : 10};
const scale_data = await qz.hid.readData(deviceInfo);
console.log("scale data =" + scale_data);
return scale_data;
}
getScaleData().then(result => {
console.log("result = " + result)
console.log(InterpretScaleData1(result));
})
}
My question has to do with the function InterpretScaleData. I've found for
this function to work I need to declare it *outside* my component class.
If I place this function as part of the class and try to reference it
(either as this.IntepretScaleData() or InterpretScaleData()) I get runtime
error saying that the function is not defined.
I'm confused by this behavior. Can anyone share some light as to why this
is so?
TIA
Harry
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