@@ -32,14 +32,8 @@ Location awareness helps determine where a mobile device locates. The system ide
Location awareness is offered by the system as a basic service for applications. Depending on the service scenario, an application needs to initiate a location request to the system and stop the location request when the service scenario ends. In this process, the system reports the location information to the application on a real-time basis.
## Limitations and Constraints
## Constraints
Your application can use the location function only after the user has granted the permission and turned on the function. If the location function is off, the system will not provide the location service for any application.
Since the location information is considered sensitive, your application still needs to obtain the location access permission from the user even if the user has turned on the location function. The system will provide the location service for your application only after it has been granted the permission to access the device location information.
## Samples
The following sample is provided to help you better understand how to develop location services:
Since the location information is considered sensitive, your application still needs to obtain the location access permission from the user even if the user has turned on the location function. The system will provide the location service for your application only after it has been granted the permission to access the device location information.
Provides system event logging APIs for system HAP applications.
This module provides system event logging APIs for system HAP applications.
> **NOTE**<br>
> - The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.
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@@ -87,9 +87,9 @@ Writes event information to the event file. This API uses a promise to return th
| Promise<boolean> | Returns **true** if the temporary device access permissions are granted; returns **false** otherwise.|
| Type| Description|
| -------- | -------- |
| Promise<boolean> | Promise used to return the result. The value **true** indicates that the temporary device access permissions are granted; and the value **false** indicates the opposite.|
**Example**
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@@ -174,16 +180,18 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes| Device pipe, which is used to determine the bus number and device address.|
| iface | [USBInterface](#usbinterface) | Yes| USB interface, which is used to determine the index of the interface to claim.|
| force | boolean | No| Whether to forcibly claim the USB interface. The default value is **false**, indicating not to forcibly claim the USB interface.|
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes| Device pipe, which is used to determine the bus number and device address.|
| iface | [USBInterface](#usbinterface) | Yes| USB interface, which is used to determine the index of the interface to claim.|
| force | boolean | No| Whether to forcibly claim the USB interface. The default value is **false**, indicating not to forcibly claim the USB interface.|
**Return value**
| Type| Description|
| -------- | -------- |
| number | Returns **0** if the USB interface is successfully claimed; returns an error code otherwise.|
| Type| Description|
| -------- | -------- |
| number | Returns **0** if the USB interface is successfully claimed; returns an error code otherwise.|
**Example**
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@@ -203,15 +211,17 @@ Before you do this, ensure that you have claimed the interface by calling [usb.c
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes| USB device pipe, which is used to determine the USB device.|
| contrlparam | [USBControlParams](#usbcontrolparams) | Yes| Control transfer parameters.|
| timeout | number | No| Timeout duration. The default value is **0**, indicating no timeout.|
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes| USB device pipe, which is used to determine the USB device.|
| contrlparam | [USBControlParams](#usbcontrolparams) | Yes| Control transfer parameters.|
| timeout | number | No| Timeout duration in ms. This parameter is optional. The default value is **0**, indicating no timeout.|
**Return value**
| Type| Description|
| -------- | -------- |
| Promise<number> | Returns the size of the transmitted or received data block if the control transfer is successful; returns **-1** if an exception occurs.|
| Type| Description|
| -------- | -------- |
| Promise<number> | Promise used to return the result, which is the size of the transmitted or received data block if the transfer is successful, or **-1** if an exception has occurred.|
**Example**
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@@ -372,17 +389,19 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes| USB device pipe, which is used to determine the USB device.|
| endpoint | [USBEndpoint](#usbendpoint) | Yes| USB endpoint, which is used to determine the USB port for data transfer.|
| buffer | Uint8Array | Yes| Buffer for writing or reading data.|
| timeout | number | No| Timeout duration. The default value is **0**, indicating no timeout.|
| Name| Type| Mandatory| Description|
| -------- | -------- | -------- | -------- |
| pipe | [USBDevicePipe](#usbdevicepipe) | Yes| USB device pipe, which is used to determine the USB device.|
| endpoint | [USBEndpoint](#usbendpoint) | Yes| USB endpoint, which is used to determine the USB port for data transfer.|
| buffer | Uint8Array | Yes| Buffer for writing or reading data.|
| timeout | number | No| Timeout duration in ms. This parameter is optional. The default value is **0**, indicating no timeout.|
**Return value**
| Type| Description|
| -------- | -------- |
| Promise<number> | Returns the size of the transmitted or received data block if the control transfer is successful; returns **-1** if an exception occurs.|
| Type| Description|
| -------- | -------- |
| Promise<number> | Promise used to return the result, which is the size of the transmitted or received data block if the transfer is successful, or **-1** if an exception has occurred.|
**Example**
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@@ -406,14 +425,16 @@ Before you do this, call [usb.getDevices](#usbgetdevices) to obtain the USB devi
| Promise\<boolean\> | Promise used to return the result. The value **true** indicates that the operation is successful, and the value **false** indicates the opposite.|
**Example**
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@@ -601,8 +622,8 @@ Sets the role types supported by a specified port, which can be **powerRole** (f
| Promise\<boolean\> | Promise used to return the result. The value **true** indicates that the operation is successful, and the value **false** indicates the opposite.|
