HiChecker is provided for you to check issues that may be easily ignored during development of OpenHarmony applications (including system-built and third-party applications). Such issues include calling of time-consuming functions by key application threads, event distribution and execution timeout in application processes, and ability resource leakage in application processes. The issues are recorded in logs or lead to process crashes explicitly so that you can find and rectify them.
> **NOTE**<br>
> The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
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```
## Constants
## Constant
Provides the constants of all rule types.
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| RULE\_CAUTION\_PRINT\_LOG | BigInt | Alarm rule, which is programmed to print a log when an alarm is generated. |
| RULE\_CAUTION\_TRIGGER\_CRASH | BigInt | Alarm rule, which is programmed to force the application to exit when an alarm is generated. |
| RULE\_THREAD\_CHECK\_SLOW\_PROCESS | BigInt | Caution rule, which is programmed to detect whether any time-consuming function is invoked. |
| RULE\_CHECK\_SLOW\_EVENT | BigInt | Caution rule, which is programmed to detect whether the event distribution or processing time has exceeded the specified time threshold. |
| RULE\_CHECK\_ABILITY\_CONNECTION\_LEAK| BigInt | Caution rule, which is programmed to detect whether ability leakage has occurred. |
| RULE_CAUTION_PRINT_LOG | bigint | Alarm rule, which is programmed to print a log when an alarm is generated. |
| RULE_CAUTION_TRIGGER_CRASH | bigint | Alarm rule, which is programmed to force the application to exit when an alarm is generated. |
| RULE_THREAD_CHECK_SLOW_PROCESS | bigint | Caution rule, which is programmed to detect whether any time-consuming function is invoked. |
| RULE_CHECK_ABILITY_CONNECTION_LEAK | bigint | Caution rule, which is programmed to detect whether ability leakage has occurred. |
## hichecker.addRule
addRule(rule: BigInt): void
addRule(rule: bigint): void
Adds one or more rules. HiChecker detects unexpected operations or gives feedback based on the added rules.
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**Parameters**
| Name | Type | Mandatory | Description |
| Name| Type | Mandatory| Description |
| ------ | ------ | ---- | ---------------- |
| rule | BigInt | Yes | Rule to be added. |
| rule | bigint | Yes | Rule to be added.|
**Example**
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## hichecker.removeRule
removeRule(rule: BigInt): void
removeRule(rule: bigint): void
Removes one or more rules. The removed rules will become ineffective.
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**Parameters**
| Name | Type | Mandatory | Description |
| Name| Type | Mandatory| Description |
| ------ | ------ | ---- | ---------------- |
| rule | BigInt | Yes | Rule to be removed. |
| rule | bigint | Yes | Rule to be removed.|
**Example**
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## hichecker.getRule
getRule(): BigInt
getRule(): bigint
Obtains a collection of thread, process, and alarm rules that have been added.
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| Type | Description |
| ------ | ---------------------- |
| BigInt | Collection of added rules. |
| bigint | Collection of added rules.|
**Example**
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Checks whether the specified rule exists in the collection of added rules. If the rule is of the thread level, this operation is performed only on the current thread.
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Creates an SMS message instance based on the protocol data unit (PDU) and the specified SMS protocol. This API uses an asynchronous callback to return the result.
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**Example**
```js
```
const specification = '3gpp';
// Display PDUs using numbers in an array, for example, [0x08, 0x91, ...].
| hasReplyPath | boolean | Whether the received SMS contains **TP-Reply-Path**. The default value is **false**.<br>**TP-Reply-Path**: the path in which the mobile phone can reply to the SMS message through the originating SMSC.|
| hasReplyPath | boolean | Whether the received SMS contains **TP-Reply-Path**. The default value is **false**.<br>**TP-Reply-Path**: the path in which the device can reply to the SMS message through the originating SMSC.|
| isReplaceMessage | boolean | Whether the received SMS message is a **replace short message**. The default value is **false**.<br>For details, see section 9.2.3.9 in **3GPP TS 23.040**.|
| isSmsStatusReportMessage | boolean | Whether the received SMS message is an SMS delivery status report. The default value is **false**.<br>**SMS-Status-Report**: a message sent from the SMSC to the mobile station to show the SMS message delivery status.|
You can use this service for your application to redirect users to the dial screen and display the dialed number. When the **makeCall** API is called, the phone or tablet will automatically display the dial screen. On this screen, the user can choose to make an audio or video call and specify the SIM card.
You can use this service for your application to redirect users to the dial screen and display the dialed number. When the **makeCall** API is called, the device will automatically display the dial screen. On this screen, the user can choose to make an audio or video call and specify the SIM card.
