harmony 鸿蒙@ohos.net.mdns (MDNS管理)

  • 2023-06-24
  • 浏览 (737)

@ohos.net.mdns (MDNS管理)

MDNS即多播DNS（Multicast DNS），提供局域网内的本地服务添加、移除、发现、解析等能力。

说明： 本模块首批接口从API version 10开始支持。后续版本的新增接口，采用上角标单独标记接口的起始版本。

导入模块

import mdns from '@ohos.net.mdns'

mdns.addLocalService10+

addLocalService(context: Context, serviceInfo: LocalServiceInfo, callback: AsyncCallback<LocalServiceInfo>): void

添加一个mDNS服务，使用callback方式作为异步方法。

系统能力：SystemCapability.Communication.NetManager.MDNS

参数：

参数名 类型 必填 说明
context Context 是 应用的上下文。
FA模型的应用Context定义见Context。
Stage模型的应用Context定义见Context。
serviceInfo LocalServiceInfo 是 mDNS服务的信息。
callback AsyncCallback<LocalServiceInfo> 是 回调函数。成功添加error为undefined，data为添加到本地的mdns服务信息。

错误码：

错误码ID 错误信息
401 Parameter error.
2100002 Operation failed. Cannot connect to service.
2100003 System internal error.
2204003 Callback duplicated.
2204008 Service instance duplicated.
2204010 Send packet failed.

错误码说明： 以上错误码的详细介绍参见MDNS错误码。

示例：

Stage模型示例：

// 获取context
import mdns from '@ohos.net.mdns'
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}
let context = GlobalContext.getContext().getObject("value");

let localServiceInfo: mdns.LocalServiceInfo = {
  serviceType: "_print._tcp",
  serviceName: "servicename",
  port: 5555,
  host: {
  address: "10.14.**.***",
  },
  serviceAttribute: [{key: "111", value: [1]}]
}

mdns.addLocalService(context as Context, localServiceInfo, (error:BusinessError, data:mdns.LocalServiceInfo) =>  {
  console.log(JSON.stringify(error));
  console.log(JSON.stringify(data));
});

mdns.addLocalService10+

addLocalService(context: Context, serviceInfo: LocalServiceInfo): Promise<LocalServiceInfo>

添加一个mDNS服务，使用Promise方式作为异步方法。

系统能力：SystemCapability.Communication.NetManager.MDNS

参数：

参数名 类型 必填 说明
context Context 是 应用的上下文。
FA模型的应用Context定义见Context。
Stage模型的应用Context定义见Context。
serviceInfo LocalServiceInfo 是 mDNS服务的信息。

返回值：

类型 说明
Promise<LocalServiceInfo> 以Promise形式返回添加的mdns服务信息。

错误码：

错误码ID 错误信息
401 Parameter error.
2100002 Operation failed. Cannot connect to service.
2100003 System internal error.
2204003 Callback duplicated.
2204008 Service instance duplicated.
2204010 Send packet failed.

错误码说明： 以上错误码的详细介绍参见MDNS错误码。

示例：

Stage模型示例：

// 获取context
import mdns from '@ohos.net.mdns'
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}
let context = GlobalContext.getContext().getObject("value");

let localServiceInfo: mdns.LocalServiceInfo = {
  serviceType: "_print._tcp",
  serviceName: "servicename",
  port: 5555,
  host: {
    address: "10.14.**.***",
  },
  serviceAttribute: [{key: "111", value: [1]}]
}

mdns.addLocalService(context as Context, localServiceInfo).then((data: mdns.LocalServiceInfo) => {
  console.log(JSON.stringify(data));
});

mdns.removeLocalService10+

removeLocalService(context: Context, serviceInfo: LocalServiceInfo, callback: AsyncCallback<LocalServiceInfo>): void

移除一个mDNS服务，使用callback方式作为异步方法。

系统能力: SystemCapability.Communication.NetManager.MDNS

参数

参数名 类型 必填 说明
context Context 是 应用的上下文。
FA模型的应用Context定义见Context。
Stage模型的应用Context定义见Context。
serviceInfo LocalServiceInfo 是 mDNS服务的信息。
callback AsyncCallback<LocalServiceInfo> 是 回调函数。成功移除error为undefined，data为移除本地的mdns服务信息。

错误码：

错误码ID 错误信息
401 Parameter error.
2100002 Operation failed. Cannot connect to service.
2100003 System internal error.
2204002 Callback not found.
2204008 Service instance not found.
2204010 Send packet failed.

错误码说明： 以上错误码的详细介绍参见MDNS错误码。

示例：

Stage模型示例：

// 获取context
import mdns from '@ohos.net.mdns'
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}
let context = GlobalContext.getContext().getObject("value");

let localServiceInfo: mdns.LocalServiceInfo = {
  serviceType: "_print._tcp",
  serviceName: "servicename",
  port: 5555,
  host: {
  address: "10.14.**.***",
  },
  serviceAttribute: [{key: "111", value: [1]}]
}

mdns.removeLocalService(context as Context, localServiceInfo, (error: BusinessError, data: mdns.LocalServiceInfo) =>  {
  console.log(JSON.stringify(error));
  console.log(JSON.stringify(data));
});

mdns.removeLocalService10+

removeLocalService(context: Context, serviceInfo: LocalServiceInfo): Promise<LocalServiceInfo>

移除一个mDNS服务. 使用Promise方式作为异步方法。

系统能力: SystemCapability.Communication.NetManager.MDNS

参数

参数名 类型 必填 说明
context Context 是 应用的上下文。
FA模型的应用Context定义见Context。
Stage模型的应用Context定义见Context。
serviceInfo LocalServiceInfo 是 mDNS服务的信息。

返回值：

类型 说明
Promise<LocalServiceInfo> 以Promise形式返回移除的mdns服务信息。

错误码：

错误码ID 错误信息
401 Parameter error.
2100002 Operation failed. Cannot connect to service.
2100003 System internal error.
2204002 Callback not found.
2204008 Service instance not found.
2204010 Send packet failed.

错误码说明： 以上错误码的详细介绍参见MDNS错误码。

示例：

Stage模型示例：

import mdns from '@ohos.net.mdns'
// 获取context
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}
let context = GlobalContext.getContext().getObject("value");

let localServiceInfo: mdns.LocalServiceInfo = {
  serviceType: "_print._tcp",
  serviceName: "servicename",
  port: 5555,
  host: {
  address: "10.14.**.***",
  },
  serviceAttribute: [{key: "111", value: [1]}]
}

mdns.removeLocalService(context as Context, localServiceInfo).then((data: mdns.LocalServiceInfo) => {
  console.log(JSON.stringify(data));
});

mdns.createDiscoveryService10+

createDiscoveryService(context: Context, serviceType: string): DiscoveryService

返回一个DiscoveryService对象，该对象用于发现指定服务类型的mDNS服务。

系统能力：SystemCapability.Communication.NetManager.MDNS

参数：

参数名 类型 必填 说明
context Context 是 应用的上下文。
FA模型的应用Context定义见Context。
Stage模型的应用Context定义见Context。
serviceType string 是 需要发现的mDNS服务类型。

返回值：

Type Description
DiscoveryService 基于指定serviceType和Context的发现服务对象。

错误码：

错误码ID 错误信息
401 Parameter error.

示例

Stage模型示例：

// 获取context
import mdns from '@ohos.net.mdns'
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}
let context = GlobalContext.getContext().getObject("value");

let serviceType = "_print._tcp";
let discoveryService : Object = mdns.createDiscoveryService(context as Context, serviceType);

mdns.resolveLocalService10+

resolveLocalService(context: Context, serviceInfo: LocalServiceInfo, callback: AsyncCallback<LocalServiceInfo>): void

解析一个mDNS服务，使用callback方式作为异步方法。

系统能力: SystemCapability.Communication.NetManager.MDNS

参数：

参数名 类型 必填 说明
context Context 是 应用的上下文。
FA模型的应用Context定义见Context。
Stage模型的应用Context定义见Context。
serviceInfo LocalServiceInfo 是 mDNS服务的信息。
callback AsyncCallback<LocalServiceInfo> 是 回调函数。成功移除error为undefined，data为解析的mdns服务信息。

错误码：

错误码ID 错误信息
401 Parameter error.
2100002 Operation failed. Cannot connect to service.
2100003 System internal error.
2204003 Callback duplicated.
2204006 Request timeout.
2204010 Send packet failed.

错误码说明： 以上错误码的详细介绍参见MDNS错误码。

示例：

Stage模型示例：

// 获取context
import mdns from '@ohos.net.mdns'
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}
let context = GlobalContext.getContext().getObject("value");

let localServiceInfo: mdns.LocalServiceInfo = {
  serviceType: "_print._tcp",
  serviceName: "servicename",
  port: 5555,
  host: {
  address: "10.14.**.***",
  },
  serviceAttribute: [{key: "111", value: [1]}]
}

mdns.resolveLocalService(context as Context, localServiceInfo, (error: BusinessError, data: mdns.LocalServiceInfo) =>  {
  console.log(JSON.stringify(error));
  console.log(JSON.stringify(data));
});

mdns.resolveLocalService10+

resolveLocalService(context: Context, serviceInfo: LocalServiceInfo): Promise<LocalServiceInfo>

解析一个mDNS服务，使用Promise方式作为异步方法。

系统能力: SystemCapability.Communication.NetManager.MDNS

参数：

参数名 类型 必填 说明
context Context 是 应用的上下文。
FA模型的应用Context定义见Context。
Stage模型的应用Context定义见Context。
serviceInfo LocalServiceInfo 是 mDNS服务的信息。

返回值：

类型 说明
Promise<LocalServiceInfo> 以Promise形式返回解析的mDNS服务信息。

错误码：

错误码ID 错误信息
401 Parameter error.
2100002 Operation failed. Cannot connect to service.
2100003 System internal error.
2204003 Callback duplicated.
2204006 Request timeout.
2204010 Send packet failed.

错误码说明： 以上错误码的详细介绍参见MDNS错误码。

示例：

Stage模型示例：

// 获取context
import mdns from '@ohos.net.mdns'
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}
let context = GlobalContext.getContext().getObject("value");

let localServiceInfo: mdns.LocalServiceInfo = {
  serviceType: "_print._tcp",
  serviceName: "servicename",
  port: 5555,
  host: {
  address: "10.14.**.***",
  },
  serviceAttribute: [{key: "111", value: [1]}]
}

mdns.resolveLocalService(context as Context, localServiceInfo).then((data: mdns.LocalServiceInfo) => {
  console.log(JSON.stringify(data));
});

DiscoveryService10+

指定服务类型的发现服务对象。

startSearchingMDNS10+

startSearchingMDNS(): void

开始搜索局域网内的mDNS服务。

系统能力：SystemCapability.Communication.NetManager.MDNS

示例：

Stage模型示例：

// 获取context
import mdns from '@ohos.net.mdns'
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}
let context = GlobalContext.getContext().getObject("value");
let serviceType = "_print._tcp";
let discoveryService = mdns.createDiscoveryService(context as Context, serviceType);
discoveryService.startSearchingMDNS();

stopSearchingMDNS10+

stopSearchingMDNS(): void

停止搜索局域网内的mDNS服务。

系统能力：SystemCapability.Communication.NetManager.MDNS

示例：

Stage模型示例：

// 获取context
import mdns from '@ohos.net.mdns'
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}
let context = GlobalContext.getContext().getObject("value");
let serviceType = "_print._tcp";
let discoveryService = mdns.createDiscoveryService(context as Context, serviceType);
discoveryService.stopSearchingMDNS();

on(‘discoveryStart’)10+

on(type: ‘discoveryStart’, callback: Callback<{serviceInfo: LocalServiceInfo, errorCode?: MdnsError}>): void

订阅开启监听mDNS服务的通知。

系统能力：SystemCapability.Communication.NetManager.MDNS

参数：

参数名 类型 必填 说明
type string 是 订阅事件，固定为’discoveryStart’。
discoveryStart：开始搜索局域网内的mDNS服务事件。
callback Callback<{serviceInfo: LocalServiceInfo, errorCode?: MdnsError}> 是 mDNS服务的信息和事件错误信息。

示例：

import mdns from '@ohos.net.mdns'
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}

// 参考mdns.createDiscoveryService
class DataServiceInfo{
  serviceInfo: mdns.LocalServiceInfo|null = null
  errorCode?: mdns.MdnsError = 0
}
let context = GlobalContext.getContext().getObject("value");
let serviceType = "_print._tcp";
let discoveryService = mdns.createDiscoveryService(context as Context, serviceType);
discoveryService.startSearchingMDNS();

discoveryService.on('discoveryStart', (data: DataServiceInfo) => {
  console.log(JSON.stringify(data));
});

discoveryService.stopSearchingMDNS();

off(‘discoveryStart’)10+

off(type: ‘discoveryStart’, callback?: Callback<{ serviceInfo: LocalServiceInfo, errorCode?: MdnsError }>): void

取消开启监听mDNS服务的通知。

系统能力：SystemCapability.Communication.NetManager.MDNS

参数：

参数名 类型 必填 说明
type string 是 取消订阅的事件，固定为’discoveryStart’。
discoveryStart：开始搜索局域网内的mDNS服务事件。
callback Callback<{serviceInfo: LocalServiceInfo, errorCode?: MdnsError}> 否 mDNS服务的信息和事件错误信息。

示例：

import mdns from '@ohos.net.mdns'
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}
// 参考mdns.createDiscoveryService
let context = GlobalContext.getContext().getObject("value");
let serviceType = "_print._tcp";
let discoveryService = mdns.createDiscoveryService(context as Context, serviceType);
discoveryService.startSearchingMDNS();

interface Data {
  serviceInfo: mdns.LocalServiceInfo,
  errorCode?: mdns.MdnsError
}
discoveryService.on('discoveryStart', (data: Data) => {
  console.log(JSON.stringify(data));
});

discoveryService.stopSearchingMDNS();

discoveryService.off('discoveryStart', (data: Data) => {
  console.log(JSON.stringify(data));
});

on(‘discoveryStop’)10+

on(type: ‘discoveryStop’, callback: Callback<{serviceInfo: LocalServiceInfo, errorCode?: MdnsError}>): void

订阅停止监听mDNS服务的通知。

系统能力：SystemCapability.Communication.NetManager.MDNS

参数：

参数名 类型 必填 说明
type string 是 订阅事件，固定为’discoveryStop’。
discoveryStop：停止搜索局域网内的mDNS服务事件。
callback Callback<{serviceInfo: LocalServiceInfo, errorCode?: MdnsError}> 是 mDNS服务的信息和事件错误信息。

示例：

import mdns from '@ohos.net.mdns'
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}
// 参考mdns.createDiscoveryService
let context = GlobalContext.getContext().getObject("value");
let serviceType = "_print._tcp";
let discoveryService = mdns.createDiscoveryService(context as Context, serviceType);
discoveryService.startSearchingMDNS();

interface Data {
  serviceInfo: mdns.LocalServiceInfo,
  errorCode?: mdns.MdnsError
}
discoveryService.on('discoveryStop', (data: Data) => {
  console.log(JSON.stringify(data));
});

discoveryService.stopSearchingMDNS();

off(‘discoveryStop’)10+

off(type: ‘discoveryStop’, callback?: Callback<{ serviceInfo: LocalServiceInfo, errorCode?: MdnsError }>): void

取消订阅停止监听mDNS服务的通知。

系统能力：SystemCapability.Communication.NetManager.MDNS

参数：

参数名 类型 必填 说明
type string 是 取消订阅的事件’discoveryStop’。
discoveryStop：停止搜索局域网内的mDNS服务事件。
callback Callback<{serviceInfo: LocalServiceInfo, errorCode?: MdnsError}> 否 mDNS服务的信息和事件错误信息。

示例：

import mdns from '@ohos.net.mdns'
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}
// 参考mdns.createDiscoveryService
let context = GlobalContext.getContext().getObject("value");
let serviceType = "_print._tcp";
let discoveryService = mdns.createDiscoveryService(context as Context, serviceType);
discoveryService.startSearchingMDNS();

interface Data {
  serviceInfo: mdns.LocalServiceInfo,
  errorCode?: mdns.MdnsError
}
discoveryService.on('discoveryStop', (data: Data) => {
  console.log(JSON.stringify(data));
});

discoveryService.stopSearchingMDNS();

discoveryService.off('discoveryStop', (data: Data) => {
  console.log(JSON.stringify(data));
});

on(‘serviceFound’)10+

on(type: ‘serviceFound’, callback: Callback<LocalServiceInfo>): void

订阅发现mDNS服务的通知。

系统能力：SystemCapability.Communication.NetManager.MDNS

参数：

参数名 类型 必填 说明
type string 是 订阅事件，固定为’serviceFound’。
serviceFound：发现mDNS服务事件。
callback Callback<LocalServiceInfo> 是 mDNS服务的信息。

示例：

import mdns from '@ohos.net.mdns'
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}
// 参考mdns.createDiscoveryService
let context = GlobalContext.getContext().getObject("value");
let serviceType = "_print._tcp";
let discoveryService = mdns.createDiscoveryService(context as Context, serviceType);
discoveryService.startSearchingMDNS();

discoveryService.on('serviceFound', (data: mdns.LocalServiceInfo) => {
  console.log(JSON.stringify(data));
});

discoveryService.stopSearchingMDNS();

off(‘serviceFound’)10+

off(type: ‘serviceFound’, callback?: Callback<LocalServiceInfo>): void

取消订阅发现mDNS服务的通知。

系统能力：SystemCapability.Communication.NetManager.MDNS

参数：

参数名 类型 必填 说明
type string 是 取消订阅的事件，固定为’serviceFound’。
serviceFound：发现mDNS服务事件。
callback Callback<LocalServiceInfo> 否 mDNS服务的信息。

示例：

import mdns from '@ohos.net.mdns'
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}
// 参考mdns.createDiscoveryService
let context = GlobalContext.getContext().getObject("value");
let serviceType = "_print._tcp";
let discoveryService = mdns.createDiscoveryService(context as Context, serviceType);
discoveryService.startSearchingMDNS();

discoveryService.on('serviceFound', (data: mdns.LocalServiceInfo) => {
  console.log(JSON.stringify(data));
});

discoveryService.stopSearchingMDNS();

discoveryService.off('serviceFound', (data: mdns.LocalServiceInfo) => {
  console.log(JSON.stringify(data));
});

on(‘serviceLost’)10+

on(type: ‘serviceLost’, callback: Callback<LocalServiceInfo>): void

订阅移除mDNS服务的通知。

系统能力：SystemCapability.Communication.NetManager.MDNS

参数：

参数名 类型 必填 说明
type string 是 订阅事件，固定为’serviceLost’。
serviceLost：移除mDNS服务事件。
callback Callback<LocalServiceInfo> 是 mDNS服务的信息。

示例：

import mdns from '@ohos.net.mdns'
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}
// 参考mdns.createDiscoveryService
let context = GlobalContext.getContext().getObject("value");
let serviceType = "_print._tcp";
let discoveryService = mdns.createDiscoveryService(context as Context, serviceType);
discoveryService.startSearchingMDNS();

discoveryService.on('serviceLost', (data: mdns.LocalServiceInfo) => {
  console.log(JSON.stringify(data));
});

discoveryService.stopSearchingMDNS();

off(‘serviceLost’)10+

off(type: ‘serviceLost’, callback?: Callback<LocalServiceInfo>): void

取消订阅移除mDNS服务的通知。

系统能力：SystemCapability.Communication.NetManager.MDNS

参数：

参数名 类型 必填 说明
type string 是 取消订阅的事件，固定为’serviceLost’。
serviceLost：移除mDNS服务事件。
callback Callback<LocalServiceInfo> 否 mDNS服务的信息。

示例：

import mdns from '@ohos.net.mdns'
import UIAbility from '@ohos.app.ability.UIAbility';
import { BusinessError } from '@ohos.base';
import window from '@ohos.window';

export class GlobalContext {
  private constructor() {}
  private static instance: GlobalContext;
  private _objects = new Map<string, Object>();

  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }

  getObject(value: string): Object|undefined {
    return this._objects.get(value);
  }

  setObject(key: string, objectClass: Object): void {
    this._objects.set(key, objectClass);
  }
}

class EntryAbility extends UIAbility {
  value:number = 0;
  onWindowStageCreate(windowStage:window.WindowStage): void{
    GlobalContext.getContext().setObject("value", this.value);
  }
}
// 参考mdns.createDiscoveryService
let context = GlobalContext.getContext().getObject("value");
let serviceType = "_print._tcp";
let discoveryService = mdns.createDiscoveryService(context as Context, serviceType);
discoveryService.startSearchingMDNS();

discoveryService.on('serviceLost', (data: mdns.LocalServiceInfo) => {
  console.log(JSON.stringify(data));
});

discoveryService.stopSearchingMDNS();

discoveryService.off('serviceLost', (data: mdns.LocalServiceInfo) => {
  console.log(JSON.stringify(data));
});

LocalServiceInfo10+

mDNS服务信息

系统能力：SystemCapability.Communication.NetManager.MDNS

名称 类型 必填 说明
serviceType string 是 mDNS服务的类型。格式_<name>.<_tcp/_udp>，name长度小于63字符并且不能包含字符’.‘。
serviceName string 是 mDNS服务的名字。
port number 否 mDNS服务的端口号。
host NetAddress 否 mDNS服务设备的IP地址。采用设备的IP，添加服务和移除服务时候不生效。
serviceAttribute serviceAttribute<ServiceAttribute> 否 mDNS服务属性信息。

ServiceAttribute10+

mDNS服务属性信息

系统能力：SystemCapability.Communication.NetManager.MDNS

名称 类型 必填 说明
key string 是 mDNS服务属性键值，键值长度应该小于9个字符。
value Array<number> 是 mDNS服务属性值。

MdnsError

mDNS错误信息。

系统能力：SystemCapability.Communication.NetManager.MDNS

名称 值 说明
INTERNAL_ERROR 0 内部错误导致操作失败。（暂不支持）
ALREADY_ACTIVE 1 服务已经存在导致操作失败。（暂不支持）
MAX_LIMIT 2 请求超过最大限制导致操作失败。（暂不支持）

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