如何使用 cordova-plugin-ble-central API Scan( ) 从 ionic 1 到 ionic 3

Question

我想将项目从 ionic1 迁移到 ionic3，但是 cordova-plugin-ble-central 有一些问题

ionic1

function quickScan( ) {
      var q = $ble.scan([], 3);
          q.then(function() {
        /* Done scanning */
        if (!sys.fsm.is("LISTING")) {
            setNumScans(0);
            return;
         }

        if (sys.numScans > 0)
        setNumScans(sys.numScans - 1);

        if (sys.numScans > 0) {
        quickScan();
        } else {
        if (sys.fsm.is("LISTING")) {
        sys.fsm.abort();
        sys.listOkCb(null);
        }
         }
    }, function(err) {
        /* Scanning Error */
        sys.fsm.abort();
        sys.listErrCb(err);
         }, function(dev) {
        /* New device found */
        addAndReportDevice(dev);
         });
    }

ionic3

       quickScan( ) {
       let q = this.Ble.scan([], 3)
        q.toPromise().then(function() {
        /* Done scanning */
        if (!this.fsm.is("LISTING")) {
        this.setNumScans(0);
          return;
     }
        if (this.numScans > 0)
        this.setNumScans(this.numScans - 1);

        if (this.numScans > 0) {
        this.quickScan();
     }else {
        console.log("BLE done scanning");
        if (this.fsm.is("LISTING")) {
        this.fsm.abort();
        this.listOkCb(null);
     }
      }
      },function(err) {
        /* Scanning Error */
        this.fsm.abort();
        this.listErrCb(err);
        /* New device found */
        this.addAndReportDevice(this.dev);
       });
     }

错误message:TypeError：无法读取属性未定义的“扫描”。

我不确定 Scan() 的用法是否已更改。

请告诉我如何解决。

Answer 1

我假设您正在使用 native BLE plugin for ionic 3。这是一个如何使用它的简单示例：

1) 在您的 app.module

中导入 BLE 模块

import { BLE } from '@ionic-native/ble';

@NgModule({
    declarations: [AppComponent],
    providers: [
        BLE
    ]
}

2) 在你的页面组件中注入 BLE 模块

constructor( private ble: BLE ) { ... }

3) 像这样扫描附近的 BLE 设备：


const bleServices = ["service-uuid-you-want-to-scan-for"];

this.ble.startScan(bleServices).subscribe(
    device => { console.log('Discovered device:', JSON.stringify(device)); },
    error  => { console.log('Scan error:', error); }
);

之后您可以使用设备 ID 连接到您的设备 this.ble.connect(device.id)

如何使用 cordova-plugin-ble-central API Scan( ) 从 ionic 1 到 ionic 3

How to use cordova-plugin-ble-central's API Scan( ) from ionic1 to ionic3

cordova

ionic-framework

ionic3