school-peisong/components/print/index.js

	import PrinterJobs from '@/components/print/printerjobs.js'
	import printerUtil from '@/components/print/printerutil.js'
	import util from '@/components/print/util.js'
	import drawQrcode from '@/components/print/weapp.qrcode.esm.js'
	import Bluetooth from '@/components/print/bluetooth.js'
	let bluetooth = new Bluetooth();
	let isPrint= false
	export default {
			getData() {
				var that = this;
				if(uni.getStorageSync('bluetoothDeviceId')){
					let id = uni.getStorageSync('bluetoothDeviceId')
					this.bindViewTap(id,false)
				}else{
					uni.showModal({
						title: '提示',
						content: '您还没有连接打印机，将无法为您打印小票！'
					});
				}
			},
			async bindViewTap(deviceId, state) {
				var _this = this;
				console.log(deviceId)
				try {
					//1.链接设备
					await bluetooth.createBLEConnection(deviceId).then((res) => {
						bluetooth.deviceId = deviceId;
					}).catch((e) => {
						throw e;
					});

					let server = [];
					//2.寻找服务
					await bluetooth.getBLEDeviceServices().then((res) => {
						console.log(res)
						bluetooth.notifyId = '';
						bluetooth.writeId = '';
						bluetooth.num = 0;
						bluetooth.serviceList = res
					}).catch((e) => {
						throw e;
					});

					//3.获取蓝牙设备所有服务
					let result3 = await bluetooth.getBLEDeviceCharacteristics().then(res => {
						uni.setStorageSync('bluetoothDeviceId', deviceId);
						this.pickUpOnce()
					}).catch((e) => {
						throw e;
					});
				} catch (e) {
					//TODO handle the exception
					console.log("e: " + JSON.stringify(e));
				}
			},
			//打印一次
			pickUpOnce() {
				isPrint = true;
				bluetooth.notifyBLECharacteristicValue();
				let self = this;
				setTimeout(() => {
					self.writeBLECharacteristicValue();
				}, 500);
			},
			//写入控制命令
			async writeBLECharacteristicValue() {
				let data = {
					"settled_name": "#0112配送",
					"detail": {
						"total_amount": "137.00",
						"other_amount": "0.00",
						"discount_amount": "0.00",
						"actual_amount": "137.00",
						"order_sn": "20220512165337",
						"goods_count": 3,
						"order_time": "2022-05-12 16:53:00",
						"supplier_id": 1
					},
					"code": "https://www.oulaisong.com/purchase?id=8",
					"list": [{
						"id": 8,
						"goods_name": "红烧带鱼",
						"article_number": "1",
						'sum_price':'16.00'
					}, {
						"id": 9,
						"goods_name": "女童外套",
						"article_number": "2",
						
						"sum_price": "34.00"
					}, {
						"id": 10,
						"goods_name": "25",
						"article_number": "3",
						"sum_price": "3.00"
					}]
				}
				let printerJobs = new PrinterJobs();
				printerJobs.setAlign('ct').setSize(2, 2).setLineSpacing(80).print('#0112配送')
					.setAlign('lt').setSize(1, 1).setLineSpacing(40).print('预计时间:2026-02-01 13:41:00')
					.setAlign('lt').setSize(1, 1).setLineSpacing(40).print('七里香快餐明珠店')
					.print(printerUtil.fillLine('-', 1, 50))
					.setAlign('lt').setSize(2, 2).setLineSpacing(80).print('王先生')
					.setAlign('lt').setSize(1, 1).setLineSpacing(40).print('联系电话: *******0775')
					.setAlign('lt').setSize(2, 2).setLineSpacing(80).print('地址:黑背生东川建设集团有限公司黑恶生运河区****')
					.setAlign('lt').setSize(1, 1).setLineSpacing(40).print('为保护隐私，顾客电话及地址已被隐藏，您可登录商家端或骑手端查看')
					.print(printerUtil.fillLine('-', 1, 50));
				
				
				for (var i = 0; i < data.list.length; i++) {
					printerJobs.setAlign('lt').setSize(1, 1).setLineSpacing(40).print(data.list[i].goods_name)
					
						
						let setLineSpacing = 40
						
						printerJobs.setLineSpacing(setLineSpacing).print(printerUtil.inlineArr([{
							'text': 'X' + data.list[i].article_number,
							'width': 20,
						}, {
							'text': data.list[i].sum_price,
							'width': 10,
						}], 1, 50));
				}
				printerJobs.print(printerUtil.fillLine('-', 1, 50))
					.setAlign('lt').setSize(1, 1).setLineSpacing(40).print('配送费：1圆')
					.setAlign('lt').setSize(1, 1).setLineSpacing(40).print('合计金额：17圆')
					.print(printerUtil.fillLine('-', 1, 50))
					.setAlign('lt').setSize(1, 1).setLineSpacing(40).print('商品取到后，如有任何商品问题，请及时联系商家和平台，客服将为您服务，客服电话15533910775，谢谢您的惠顾')
					.println();
				let buffer = printerJobs.buffer();
				this.sendPrint(buffer);
			},
			sendPrint(buffer) {
				// 1.并行调用多次会存在写失败的可能性
				// 2.建议每次写入不超过20字节
				// 分包处理，延时调用
				let that = this
				const maxChunk = 20;
				const delay = 20;
				isPrint = true;
				for (let i = 0, j = 0, length = buffer.byteLength; i < length; i += maxChunk, j++) {
					let subPackage = buffer.slice(i, i + maxChunk <= length ? (i + maxChunk) : length);
					setTimeout(this.sendPrintData, j * delay, subPackage);
				}
				isPrint = false;
			},
			sendPrintData(buffer) {
				bluetooth.writeBLECharacteristicValue(buffer).then(res => {});
			},
			startSearch(state) {
				let that = this
				bluetooth.openBluetoothAdapter().then(e => {
					
					uni.startBluetoothDevicesDiscovery({
						success: res => {
							uni.onBluetoothDeviceFound(result => {
								let arr = that.list;
								let devices = [];
								let list = result.devices;
								for (let i = 0; i < list.length; ++i) {
									console.log(list[i])
									if (list[i].name && list[i].name != "未知设备") {
										let arrNew = arr.filter((item) => {
											return item.deviceId == list[i].deviceId;
										});
										if (arrNew.length == 0) {
											devices.push(list[i]);
										}
										if (uni.getStorageSync('bluetoothDeviceId') == list[i]
											.deviceId) {
											// that.bindViewTap(list[i].deviceId, state)
										}
									}
								}
								that.list = arr.concat(devices);
							});
						},
						fail: res => { 
							uni.hideLoading();
							uni.showToast({
								title: `搜索设备失败` + JSON.stringify(err)
							})
						}
					})
				}).catch(e => {
					console.log(e)
				});
			},
			// 停止搜索
			stopSearch() {
				
				uni.hideLoading();
				bluetooth.stopBluetoothDevicesDiscovery();
			}
	}