// 精臣打印机原生插件。插件由 DCloud 账号绑定，账号未购买/未打入基座时不能抛错，
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// 否则页面一加载就白屏，所以这里做容错加载，缺失时打印功能给出提示而不是崩溃。
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let jcapi = null;
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let pluginMissing = false;
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try {
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jcapi = uni.requireNativePlugin("JCSDK-JCApiModule");
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if (!jcapi) {
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pluginMissing = true;
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}
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} catch (e) {
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pluginMissing = true;
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}
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const PLUGIN_MISSING_MSG = "未检测到精臣打印插件，请确认打包时已购买并勾选该原生插件";
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function requirePlugin() {
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if (pluginMissing || !jcapi) {
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uni.showToast({ title: PLUGIN_MISSING_MSG, icon: "none", duration: 3000 });
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return null;
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}
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return jcapi;
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}
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let state = {
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connectedDevice: null,
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connectionStatus: "disconnected", // disconnected | connecting | connected
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listeners: [],
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};
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/** 通知所有订阅页面 */
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function notify() {
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state.listeners.forEach(fn => fn({
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connectedDevice: state.connectedDevice,
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connectionStatus: state.connectionStatus,
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}));
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}
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/** 页面订阅蓝牙状态 */
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function onChange(fn) {
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state.listeners.push(fn);
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fn({
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connectedDevice: state.connectedDevice,
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connectionStatus: state.connectionStatus,
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});
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}
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/** 初始化（全局只需一次） */
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function init() {
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const api = requirePlugin();
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if (!api) return;
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api.initSDK();
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const saved = uni.getStorageSync("bluetoothConnection");
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if (saved) {
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state.connectedDevice = saved;
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state.connectionStatus = "connected";
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}
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// 断开监听
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api.didReadPrintErrorInfo((r) => {
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if (r.code === 23) {
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state.connectedDevice = null;
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state.connectionStatus = "disconnected";
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uni.removeStorageSync("bluetoothConnection");
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notify();
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}
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});
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}
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/** 搜索设备 */
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function searchDevices() {
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return new Promise((resolve, reject) => {
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const api = requirePlugin();
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if (!api) {
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return reject(new Error(PLUGIN_MISSING_MSG));
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}
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uni.openBluetoothAdapter({
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success() {
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api.getBluetoothDevices(list => {
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resolve(list || []);
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});
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},
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fail: reject
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});
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});
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}
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/** 连接设备 */
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function connect(device) {
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return new Promise((resolve, reject) => {
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const api = requirePlugin();
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if (!api) {
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return reject(new Error(PLUGIN_MISSING_MSG));
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}
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state.connectionStatus = "connecting";
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notify();
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api.openPrinterByDevice({
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address: device.address,
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name: device.name,
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deviceType: 0,
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}, (r) => {
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if (r.code === 0) {
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state.connectedDevice = device;
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state.connectionStatus = "connected";
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uni.setStorageSync("bluetoothConnection", device);
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notify();
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resolve(device);
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} else {
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state.connectionStatus = "disconnected";
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notify();
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reject(r);
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}
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});
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});
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}
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function isConnected() {
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return state.connectionStatus === "connected";
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}
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function getCurrentDevice() {
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return state.connectedDevice;
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}
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export default {
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init,
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onChange,
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searchDevices,
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connect,
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isConnected,
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getCurrentDevice,
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};
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