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+# 设备管理changeLog
+
+## cl.device_manager.1 API错误信息返回方式变更
+
+设备管理接口使用业务逻辑返回值表示错误信息，不符合OpenHarmony接口错误码规范。从API9开始作以下变更：
+
+异步接口：通过AsyncCallback或Promise的error对象返回错误信息。
+
+同步接口：通过抛出异常的方式返回错误信息。
+
+**变更影响**
+
+基于此前版本开发的应用，需适配接口的错误信息返回方式，否则会影响原有业务逻辑。
+
+**关键接口/组件变更**
+
+在以下接口增加错误码处理：
+  - createDeviceManager(bundleName: string, callback: AsyncCallback<DeviceManager>): void;
+  - release(): void;
+  - getTrustedDeviceListSync(): Array<DeviceInfo>
+  - getTrustedDeviceList(callback:AsyncCallback<Array<DeviceInfo>>): void;
+  - getTrustedDeviceList(): Promise<Array<DeviceInfo>>
+  - getLocalDeviceInfoSync(): DeviceInfo;
+  - getLocalDeviceInfo(callback:AsyncCallback<DeviceInfo>): void;
+  - getLocalDeviceInfo(): Promise<DeviceInfo>
+  - startDeviceDiscovery(subscribeInfo: SubscribeInfo): void;
+  - startDeviceDiscovery(subscribeInfo: SubscribeInfo, filterOptions?: string): void;
+  - stopDeviceDiscovery(subscribeId: number): void;
+  - publishDeviceDiscovery(publishInfo: PublishInfo): void;
+  - unPublishDeviceDiscovery(publishId: number): void;
+  - authenticateDevice(deviceInfo: DeviceInfo, authParam: AuthParam, callback: AsyncCallback<{deviceId: string, pinToken ?: number}>): void;
+  - unAuthenticateDevice(deviceInfo: DeviceInfo): void;
+  - verifyAuthInfo(authInfo: AuthInfo, callback: AsyncCallback<{deviceId: string, level: number}>): void;
+  - setUserOperation(operateAction: number, params: string): void;
+  - on(type: 'uiStateChange', callback: Callback<{ param: string}>): void;
+  - off(type: 'uiStateChange', callback?: Callback<{ param: string}>): void;
+  - on(type: 'deviceStateChange',  callback: Callback<{ action: DeviceStateChangeAction, device: DeviceInfo }>): void;
+  - off(type: 'deviceStateChange', callback?: Callback<{ action: DeviceStateChangeAction, device: DeviceInfo }>): void;
+  - on(type: 'deviceFound', callback: Callback<{ subscribeId: number, device: DeviceInfo }>): void;
+  - off(type: 'deviceFound', callback?: Callback<{ subscribeId: number, device: DeviceInfo }>): void;
+  - on(type: 'discoverFail', callback: Callback<{ subscribeId: number, reason: number }>): void;
+  - off(type: 'discoverFail', callback?: Callback<{ subscribeId: number, reason: number }>): void;
+  - on(type: 'publishSuccess', callback: Callback<{ publishId: number }>): void;
+  - off(type: 'publishSuccess', callback?: Callback<{ publishId: number }>): void;
+  - on(type: 'publishFail', callback: Callback<{ publishId: number, reason: number }>): void;
+  - off(type: 'publishFail', callback?: Callback<{ publishId: number, reason: number }>): void;
+  - on(type: 'serviceDie', callback: () => void): void;
+  - off(type: 'serviceDie', callback?: () => void): void;
+
+**适配指导**
+
+异步接口以getTrustedDeviceList为例，示例代码如下：
+
+```ts
+import account_osAccount from "@ohos.distributedHardware.deviceManager"
+dmInstance.getTrustedDeviceList((err, data) => {
+    console.log("getTrustedDeviceList err: " + JSON.stringify(err));
+    console.log('get trusted device info: ' + JSON.stringify(data));
+});
+
+try {
+  dmInstance.getTrustedDeviceList((err, data) => {
+    if (err) {
+      console.error("getTrustedDeviceList errCode:" + err.code + ",errMessage:" + err.message);
+      return;
+    }
+    console.log('get trusted device info: ' + JSON.stringify(data));
+  });
+} catch (err) {
+  console.error("getTrustedDeviceList errCode:" + err.code + ",errMessage:" + err.message);
+}
+```
+
+同步接口以startDeviceDiscovery为例，示例代码如下：
+
+```ts
+// 生成发现标识，随机数确保每次调用发现接口的标识不一致
+var subscribeId = Math.floor(Math.random() * 10000 + 1000);
+var subscribeInfo = {
+    "subscribeId": subscribeId,
+    "mode": 0xAA, // 主动模式
+    "medium": 0,  // 自动发现类型，同时支持多种发现类型
+    "freq": 2,    // 高频率
+    "isSameAccount": false,
+    "isWakeRemote": false,
+    "capability": 1
+};
+dmInstance.startDeviceDiscovery(subscribeInfo); // 当有设备发现时，通过deviceFound回调通知给应用程序
+
+// 生成发现标识，随机数确保每次调用发现接口的标识不一致
+var subscribeId = Math.floor(Math.random() * 10000 + 1000);
+var subscribeInfo = {
+    "subscribeId": subscribeId,
+    "mode": 0xAA, // 主动模式
+    "medium": 0,  // 自动发现类型，同时支持多种发现类型
+    "freq": 2,    // 高频率
+    "isSameAccount": false,
+    "isWakeRemote": false,
+    "capability": 1
+};
+try {
+  dmInstance.startDeviceDiscovery(subscribeInfo); // 当有设备发现时，通过deviceFound回调通知给应用程序
+} catch (err) {
+  console.error("startDeviceDiscovery errCode:" + err.code + ",errMessage:" + err.message);
+}
+```