harmony 鸿蒙@ohos.base (Public Callback Information)
@ohos.base (Public Callback Information)
The Base module defines the public callback types of ArkTS APIs, including the common and error callbacks.
NOTE
The initial APIs of this module are supported since API version 6. Newly added APIs will be marked with a superscript to indicate their earliest API version.
Modules to Import
import base from '@ohos.base';
Callback
Callback<T> {
(data: T): void;
}
Defines a common callback.
You can set data to customize the data type of the information returned by the callback.
System capability: SystemCapability.Base
Name | Type | Mandatory | Description |
---|---|---|---|
data | T | Yes | Common callback information. |
ErrorCallback
ErrorCallback<T extends Error = BusinessError> {
(err: T): void;
}
Defines a common callback that carries an error parameter.
The information returned by the callback is of the BusinessError type.
System capability: SystemCapability.Base
Parameters
Name | Type | Mandatory | Description |
---|---|---|---|
err | T | Yes | Common error information about the API invoking failure. |
AsyncCallback
AsyncCallback<T, E = void> {
(err: BusinessError, data: T): void;
}
Defines a common callback that carries an error parameter and asynchronous return value.
The error parameter is of the BusinessError type.
The type of the asynchronous return value is defined by the developer.
System capability: SystemCapability.Base
Name | Type | Mandatory | Description |
---|---|---|---|
err | BusinessError | Yes | Common error information about the API invoking failure. |
data | T | Yes | Common callback information. |
BusinessError
BusinessError<T = void> extends Error {
code: number;
data?: T; }
Defines the error parameter.
System capability: SystemCapability.Base
Name | Type | Mandatory | Description |
---|---|---|---|
code | number | Yes | Common error information about the API invoking failure. |
data | T | No | Common callback information. If this parameter is left empty, no related information is returned. |
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