# Interface (CameraOutput)

> phone 12+ | 2in1 13+ | tablet 12+ | tv 19+ | wearable 23+

会话中[Session](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/arkts-apis-camera-session)使用的输出信息，output的基类。
> 说明
>
> 本模块首批接口从API version 10开始支持。后续版本的新增接口，采用上角标单独标记接口的起始版本。

## 导入模块

```ts
import { camera } from '@kit.CameraKit';
```

## release

release(callback: AsyncCallback<void>): void

释放输出资源，通过注册回调函数获取结果。使用callback异步回调。

**元服务API：** 从API version 19开始，该接口支持在元服务中使用。

**系统能力：** SystemCapability.Multimedia.Camera.Core

**参数：**

|参数名|类型|必填|说明|
|:-------|:------------------|:-|:------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|callback|AsyncCallback<void>|是|回调函数。当释放输出资源成功，err为undefined，否则为错误对象。错误码类型[CameraErrorCode](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/arkts-apis-camera-e#cameraerrorcode)。|

**错误码：**

以下错误码的详细介绍请参见[Camera错误码](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/errorcode-camera)。

|错误码ID|错误信息|
|:------|:--------------------------|
|7400201|Camera service fatal error.|

**示例：**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

function releasePreviewOutput(previewOutput: camera.PreviewOutput): void {
  previewOutput.release((err: BusinessError) => {
    if (err) {
      console.error(`Failed to release the Preview output instance ${err.code}`);
      return;
    }
    console.info('Callback invoked to indicate that the preview output instance is released successfully.');
  });
}

function releaseVideoOutput(videoOutput: camera.VideoOutput): void {
  videoOutput.release((err: BusinessError) => {
    if (err) {
      console.error(`Failed to release the video output instance ${err.code}`);
      return;
    }
    console.info('Callback invoked to indicate that the video output instance is released successfully.');
  });
}
```

## release

release(): Promise<void>

释放输出资源。使用Promise异步回调。

**元服务API：** 从API version 19开始，该接口支持在元服务中使用。

**系统能力：** SystemCapability.Multimedia.Camera.Core

**返回值：**

|类型|说明|
|:------------|:---------------|
|Promise<void>|Promise对象，无返回结果。|

**错误码：**

以下错误码的详细介绍请参见[Camera错误码](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/errorcode-camera)。

|错误码ID|错误信息|
|:------|:--------------------------|
|7400201|Camera service fatal error.|

**示例：**

```ts
import { BusinessError } from '@kit.BasicServicesKit';

function releasePreviewOutput(previewOutput: camera.PreviewOutput): void {
  previewOutput.release().then(() => {
    console.info('Promise returned to indicate that the preview output instance is released successfully.');
  }).catch((error: BusinessError) => {
    console.error(`Failed to preview output release, error code: ${error.code}`);
  });
}

function releaseVideoOutput(videoOutput: camera.VideoOutput): void {
  videoOutput.release().then(() => {
    console.info('Promise returned to indicate that the video output instance is released successfully.');
  }).catch((error: BusinessError) => {
    console.error(`Failed to video output release, error code: ${error.code}`);
  });
}
```