如何解决WEBHID API:条码扫描器未触发 Inputreport
我几乎在使用 Nintendo Switch Joy-Con 控制器演示,我对其进行了一些修改以使其与我的条形码扫描仪配合使用。它只是不起作用,如果它起作用,它会在 100 次站点刷新中起作用。
console.log = text => {
log.textContent += `${text}\r\n`;
};
let device;
if (!("hid" in navigator)) {
console.log("WebHID is not available yet.");
}
navigator.hid.getDevices().then(devices => {
if (devices.length == 0) {
console.log(`No HID devices selected. Press the "request device" button.`);
return;
}
device = devices[0];
console.log(`User prevIoUsly selected "${device.productName}" HID device.`);
console.log(`Now press "open device" button to receive input reports.`);
});
requestDeviceButton.onclick = async event => {
document.body.style.display = "none";
try {
const filters = [
{
vendorId: "8792",productId: "9032"
}
];
[device] = await navigator.hid.requestDevice({ filters });
if (!device) return;
console.log(`User selected "${device.productName}" HID device.`);
console.log(`Now press "open device" button to receive input reports.`);
} finally {
document.body.style.display = "";
}
};
openButton.onclick = async event => {
if (!device) return;
await device.open();
console.log(`Waiting for user to press button...`);
device.addEventListener("inputreport",event => {
const { data,device,reportId } = event;
if (device.productId != "9032") return;
const value = data.getUint8(0);
if (value == 0) return;
console.log(`Data: ${value}.`);
});
};
openButton.onclick 事件每次我用条码扫描器扫描时都会触发。因此,每次我扫描某些内容时,它都会尝试再次执行 device.open() 。并且 inputreport 事件根本不会触发。
有谁知道这是什么原因造成的?
解决方法
嘿,我切换到 WEBUSB api 并在使用 zadig 为条码扫描仪重新安装 winusb 驱动程序后让它工作。
这是我使用 rn 的代码。如果有人感兴趣。按下按钮即可启动 RFID 功能。
const RFID = async () => {
try {
const filters = [{
vendorId: 0x1A86
}];
const device = await navigator.usb.requestDevice({ filters })
const configuration_number = 1 // device.configuration.configurationValue
const interface_number = 0 // device.configuration.interfaces[1].interfaceNumber
const interface_class = 255 // device.configuration.interfaces[1].alternates[0].interfaceClass
console.log(device);
console.log(`configuration number : ${configuration_number}`);
console.log(`interface number : ${interface_number} `);
console.log(`interface class : ${interface_class} `);
await device.open();
await device.selectConfiguration(configuration_number);
await device.claimInterface(interface_number);
await device.controlTransferOut({
requestType: 'class',recipient: 'interface',request: 0x22,value: 0x10,index: interface_number
});
const read = async (device) => {
const result = await device.transferIn(2,64);
const decoder = new TextDecoder();
const message = decoder.decode(result.data);
return message
}
var m
do {
m = await read(device)
setQR(oldArr => [...oldArr,m])
console.log(m)
} while (m.charCodeAt(0) !== 13)
} catch (error) {
console.log(error);
}}
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