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鸿蒙原生应用/元服务开发-Stage模型能力接口（九）下_messagesequence.writestringarray()

作者：2023面试高手 | 2024-03-27 08:14:32

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messagesequence.writestringarray()

@ohos.app.ability.UIAbility (UIAbility)
Caller
通用组件Caller通信客户端调用接口, 用来向通用组件服务端发送约定数据。

Caller.call
call(method: string, data: rpc.Parcelable): Promise<void>;

向通用组件服务端发送约定序列化数据。

系统能力：SystemCapability.Ability.AbilityRuntime.AbilityCore
 

鸿蒙原生应用/元服务开发-Stage模型能力接口（九）下-鸿蒙开发者社区


 

鸿蒙原生应用/元服务开发-Stage模型能力接口（九）下-鸿蒙开发者社区


示例：

  1. class MyMessageAble{ // 自定义的Parcelable数据结构
  2.   name:''
  3.   str:''
  4.   num: 1
  5.   constructor(name, str) {
  6.     this.name = name;
  7.     this.str = str;
  8.   }
  9.   marshalling(messageSequence) {
  10.     messageSequence.writeInt(this.num);
  11.     messageSequence.writeString(this.str);
  12.     console.log('MyMessageAble marshalling num[' + this.num + '] str[' + this.str + ']');
  13.     return true;
  14.   }
  15.   unmarshalling(messageSequence) {
  16.     this.num = messageSequence.readInt();
  17.     this.str = messageSequence.readString();
  18.     console.log('MyMessageAble unmarshalling num[' + this.num + '] str[' + this.str + ']');
  19.     return true;
  20.   }
  21. };
  22. let method = 'call_Function'; // 约定的通知消息字符串
  23. let caller;
  24. export default class MainAbility extends Ability {
  25.   onWindowStageCreate(windowStage) {
  26.     this.context.startAbilityByCall({
  27.       bundleName: 'com.example.myservice',
  28.       abilityName: 'MainAbility',
  29.       deviceId: ''
  30.     }).then((obj) => {
  31.       caller = obj;
  32.       let msg = new MyMessageAble('msg', 'world'); // 参考Parcelable数据定义
  33.       caller.call(method, msg)
  34.         .then(() => {
  35.           console.log('Caller call() called');
  36.         })
  37.         .catch((callErr) => {
  38.           console.log('Caller.call catch error, error.code: ' + JSON.stringify(callErr.code) +
  39.             ' error.message: ' + JSON.stringify(callErr.message));
  40.         });
  41.     }).catch((err) => {
  42.       console.log('Caller GetCaller error, error.code: ' + JSON.stringify(err.code) +
  43.         ' error.message: ' + JSON.stringify(err.message));
  44.     });
  45.   }
  46. }
  47.

Caller.callWithResult
callWithResult(method: string, data: rpc.Parcelable): Promise<rpc.MessageSequence>;
向通用组件服务端发送约定序列化数据, 并将服务端返回的约定序列化数据带回。
系统能力：SystemCapability.Ability.AbilityRuntime.AbilityCore
 

鸿蒙原生应用/元服务开发-Stage模型能力接口（九）下-鸿蒙开发者社区


 

鸿蒙原生应用/元服务开发-Stage模型能力接口（九）下-鸿蒙开发者社区


示例：

  1. class MyMessageAble{
  2.   name:''
  3.   str:''
  4.   num: 1
  5.   constructor(name, str) {
  6.     this.name = name;
  7.     this.str = str;
  8.   }
  9.   marshalling(messageSequence) {
  10.     messageSequence.writeInt(this.num);
  11.     messageSequence.writeString(this.str);
  12.     console.log('MyMessageAble marshalling num[' + this.num + '] str[' + this.str + ']');
  13.     return true;
  14.   }
  15.   unmarshalling(messageSequence) {
  16.     this.num = messageSequence.readInt();
  17.     this.str = messageSequence.readString();
  18.     console.log('MyMessageAble unmarshalling num[' + this.num + '] str[' + this.str + ']');
  19.     return true;
  20.   }
  21. };
  22. let method = 'call_Function';
  23. let caller;
  24. export default class MainAbility extends Ability {
  25.   onWindowStageCreate(windowStage) {
  26.     this.context.startAbilityByCall({
  27.       bundleName: 'com.example.myservice',
  28.       abilityName: 'MainAbility',
  29.       deviceId: ''
  30.     }).then((obj) => {
  31.       caller = obj;
  32.       let msg = new MyMessageAble(1, 'world');
  33.       caller.callWithResult(method, msg)
  34.         .then((data) => {
  35.           console.log('Caller callWithResult() called');
  36.           let retmsg = new MyMessageAble(0, '');
  37.           data.readParcelable(retmsg);
  38.         })
  39.         .catch((callErr) => {
  40.           console.log('Caller.callWithResult catch error, error.code: ' + JSON.stringify(callErr.code) +
  41.             ' error.message: ' + JSON.stringify(callErr.message));
  42.         });
  43.     }).catch((err) => {
  44.       console.log('Caller GetCaller error, error.code: ' + JSON.stringify(err.code) +
  45.         ' error.message: ' + JSON.stringify(err.message));
  46.     });
  47.   }
  48. }
  49.

Caller.release
release(): void;
主动释放通用组件服务端的通信接口。
系统能力：SystemCapability.UIAbility.UIAbilityRuntime.UIAbilityCore
错误码：
 

鸿蒙原生应用/元服务开发-Stage模型能力接口（九）下-鸿蒙开发者社区


示例

  1. let caller;
  2. export default class MainAbility extends Ability {
  3.   onWindowStageCreate(windowStage) {
  4.     this.context.startAbilityByCall({
  5.       bundleName: 'com.example.myservice',
  6.       abilityName: 'MainAbility',
  7.       deviceId: ''
  8.     }).then((obj) => {
  9.       caller = obj;
  10.       try {
  11.         caller.release();
  12.       } catch (releaseErr) {
  13.         console.log('Caller.release catch error, error.code: ' + JSON.stringify(releaseErr.code) +
  14.           ' error.message: ' + JSON.stringify(releaseErr.message));
  15.       }
  16.     }).catch((err) => {
  17.       console.log('Caller GetCaller error, error.code: ' + JSON.stringify(err.code) +
  18.         ' error.message: ' + JSON.stringify(err.message));
  19.     });
  20.   }
  21. }
  22.

Caller.onRelease
onRelease(callback: OnReleaseCallback): void;
注册通用组件服务端Stub（桩）断开监听通知。
系统能力：SystemCapability.Ability.AbilityRuntime.AbilityCore

鸿蒙原生应用/元服务开发-Stage模型能力接口（九）下-鸿蒙开发者社区


示例；

  1. let caller;
  2. export default class MainAbility extends Ability {
  3.   onWindowStageCreate(windowStage) {
  4.     this.context.startAbilityByCall({
  5.       bundleName: 'com.example.myservice',
  6.       abilityName: 'MainAbility',
  7.       deviceId: ''
  8.     }).then((obj) => {
  9.         caller = obj;
  10.         try {
  11.           caller.onRelease((str) => {
  12.               console.log(' Caller OnRelease CallBack is called ' + str);
  13.           });
  14.         } catch (error) {
  15.           console.log('Caller.onRelease catch error, error.code: ' + JSON.stringify(error.code) +
  16.             ' error.message: ' + JSON.stringify(error.message));
  17.         }
  18.     }).catch((err) => {
  19.       console.log('Caller GetCaller error, error.code: ' + JSON.stringify(err.code) +
  20.         ' error.message: ' + JSON.stringify(err.message));
  21.     });
  22.   }
  23. }

Caller.on
on(type: ‘release’, callback: OnReleaseCallback): void;
注册通用组件服务端Stub（桩）断开监听通知。
系统能力：SystemCapability.Ability.AbilityRuntime.AbilityCore
 

鸿蒙原生应用/元服务开发-Stage模型能力接口（九）下-鸿蒙开发者社区


示例：

  1. let caller;
  2. export default class MainAbility extends Ability {
  3.   onWindowStageCreate(windowStage) {
  4.     this.context.startAbilityByCall({
  5.       bundleName: 'com.example.myservice',
  6.       abilityName: 'MainAbility',
  7.       deviceId: ''
  8.     }).then((obj) => {
  9.         caller = obj;
  10.         try {
  11.           caller.on('release', (str) => {
  12.               console.log(' Caller OnRelease CallBack is called ' + str);
  13.           });
  14.         } catch (error) {
  15.           console.log('Caller.on catch error, error.code: ' + JSON.stringify(error.code) +
  16.             ' error.message: ' + JSON.stringify(error.message));
  17.         }
  18.     }).catch((err) => {
  19.       console.log('Caller GetCaller error, error.code: ' + JSON.stringify(err.code) +
  20.         ' error.message: ' + JSON.stringify(err.message));
  21.     });
  22.   }
  23. }
  24.

Caller.off
off(type: ‘release’, callback: OnReleaseCallback): void;
取消注册通用组件服务端Stub（桩）断开监听通知。预留能力，当前暂未支持。
系统能力：SystemCapability.Ability.AbilityRuntime.AbilityCore
 

鸿蒙原生应用/元服务开发-Stage模型能力接口（九）下-鸿蒙开发者社区


示例：

  1. let caller;
  2. export default class MainUIAbility extends Ability {
  3.   onWindowStageCreate(windowStage) {
  4.     this.context.startAbilityByCall({
  5.       bundleName: 'com.example.myservice',
  6.       abilityName: 'MainUIAbility',
  7.       deviceId: ''
  8.     }).then((obj) => {
  9.         caller = obj;
  10.         try {
  11.           let onReleaseCallBack = (str) => {
  12.               console.log(' Caller OnRelease CallBack is called ' + str);
  13.           };
  14.           caller.on('release', onReleaseCallBack);
  15.           caller.off('release', onReleaseCallBack);
  16.         } catch (error) {
  17.           console.log('Caller.on or Caller.off catch error, error.code: ' + JSON.stringify(error.code) +
  18.             ' error.message: ' + JSON.stringify(error.message));
  19.         }
  20.     }).catch((err) => {
  21.       console.log('Caller GetCaller error, error.code: ' + JSON.stringify(err.code) +
  22.         ' error.message: ' + JSON.stringify(err.message));
  23.     });
  24.   }
  25. }
  26.

Caller.off
off(type: ‘release’): void;
取消注册通用组件服务端Stub（桩）断开监听通知。预留能力，当前暂未支持。
系统能力：SystemCapability.Ability.AbilityRuntime.AbilityCore
 

鸿蒙原生应用/元服务开发-Stage模型能力接口（九）下-鸿蒙开发者社区


示例：

  1. let caller;
  2. export default class MainUIAbility extends Ability {
  3.   onWindowStageCreate(windowStage) {
  4.     this.context.startAbilityByCall({
  5.       bundleName: 'com.example.myservice',
  6.       abilityName: 'MainUIAbility',
  7.       deviceId: ''
  8.     }).then((obj) => {
  9.         caller = obj;
  10.         try {
  11.           let onReleaseCallBack = (str) => {
  12.               console.log(' Caller OnRelease CallBack is called ' + str);
  13.           };
  14.           caller.on('release', onReleaseCallBack);
  15.           caller.off('release');
  16.         } catch (error) {  
  17.           console.error('Caller.on or Caller.off catch error, error.code: ' + JSON.stringify(error.code) +
  18.             ' error.message: ' + JSON.stringify(error.message));
  19.         }
  20.     }).catch((err) => {
  21.       console.error('Caller GetCaller error, error.code: ' + JSON.stringify(err.code) +
  22.         ' error.message: ' + JSON.stringify(err.message));
  23.     });
  24.   }
  25. }
  26.

Callee
通用组件服务端注册和解除客户端caller通知送信的callback接口。
Callee.on
on(method: string, callback: CalleeCallback): void;
通用组件服务端注册消息通知callback。
系统能力：SystemCapability.Ability.AbilityRuntime.AbilityCore
 

鸿蒙原生应用/元服务开发-Stage模型能力接口（九）下-鸿蒙开发者社区


示例：

  1. class MyMessageAble{
  2.     name:''
  3.     str:''
  4.     num: 1
  5.     constructor(name, str) {
  6.       this.name = name;
  7.       this.str = str;
  8.     }
  9.     marshalling(messageSequence) {
  10.         messageSequence.writeInt(this.num);
  11.         messageSequence.writeString(this.str);
  12.         console.log('MyMessageAble marshalling num[' + this.num + '] str[' + this.str + ']');
  13.         return true;
  14.     }
  15.     unmarshalling(messageSequence) {
  16.         this.num = messageSequence.readInt();
  17.         this.str = messageSequence.readString();
  18.         console.log('MyMessageAble unmarshalling num[' + this.num + '] str[' + this.str + ']');
  19.         return true;
  20.     }
  21. };
  22. let method = 'call_Function';
  23. function funcCallBack(pdata) {
  24.     console.log('Callee funcCallBack is called ' + pdata);
  25.     let msg = new MyMessageAble('test', '');
  26.     pdata.readParcelable(msg);
  27.     return new MyMessageAble('test1', 'Callee test');
  28. }
  29. export default class MainAbility extends Ability {
  30.   onCreate(want, launchParam) {
  31.     console.log('Callee onCreate is called');
  32.     try {
  33.       this.callee.on(method, funcCallBack);
  34.     } catch (error) {
  35.       console.log('Callee.on catch error, error.code: ' + JSON.stringify(error.code) +
  36.         ' error.message: ' + JSON.stringify(error.message));
  37.     }
  38.   }
  39. }
  40.

Callee.off
off(method: string): void;
解除通用组件服务端注册消息通知callback。
系统能力：SystemCapability.UIAbility.UIAbilityRuntime.UIAbilityCore
 

鸿蒙原生应用/元服务开发-Stage模型能力接口（九）下-鸿蒙开发者社区


示例：

  1. let method = 'call_Function';
  2. export default class MainAbility extends Ability {
  3.   onCreate(want, launchParam) {
  4.     console.log('Callee onCreate is called');
  5.     try {
  6.       this.callee.off(method);
  7.     } catch (error) {
  8.       console.log('Callee.off catch error, error.code: ' + JSON.stringify(error.code) +
  9.         ' error.message: ' + JSON.stringify(error.message));
  10.     }
  11.   }
  12. }
  13.

OnReleaseCallback
(msg: string): void;

鸿蒙原生应用/元服务开发-Stage模型能力接口（九）下-鸿蒙开发者社区

本文根据HarmonyOS官方开发文档整理

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