js-apis-screenshot.md

# Screenshot

>  **NOTE**<br/>
> The initial APIs of this module are supported since API version 7. Newly added APIs will be marked with a superscript to indicate their earliest API version.

## Modules to Import

```js
import screenshot from '@ohos.screenshot';
```

## ScreenshotOptions

Describes screenshot options.

**System capability**: SystemCapability.WindowManager.WindowManager.Core


| Name    | Type         | Mandatory| Description                                                        |
| ---------- | ------------- | ---- | ------------------------------------------------------------ |
| screenRect | [Rect](#rect) | No  | Region of the screen to capture. If this parameter is null, the full screen will be captured.|
| imageSize  | [Size](#size) | No  | Size of the screen region to capture. If this parameter is null, the full screen will be captured.|
| rotation   | number        | No  | Rotation angle of the screenshot. Currently, the value can be **0** only. The default value is **0**.|


## Rect

Describes the region of the screen to capture.

**System capability**: SystemCapability.WindowManager.WindowManager.Core

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| left   | number | Yes  | Left boundary of the screen region to capture.|
| top    | number | Yes  | Top boundary of the screen region to capture.|
| width  | number | Yes  | Width of the screen region to capture.|
| height | number | Yes  | Height of the screen region to capture.|


## Size

Describes the size of the screen region to capture.

**System capability**: SystemCapability.WindowManager.WindowManager.Core

| Name| Type  | Mandatory| Description                                                        |
| ------ | ------ | ---- | ------------------------------------------------------------ |
| width  | number | Yes  | Width of the screen region to capture.|
| height | number | Yes  | Height of the screen region to capture.|

## screenshot.save

save(options?: ScreenshotOptions, callback: AsyncCallback&lt;image.PixelMap&gt;): void

Takes a screenshot and saves it as a **PixelMap** object. This method uses a callback to return the result.

**System capability**: SystemCapability.WindowManager.WindowManager.Core

**Required permissions**: ohos.permission.CAPTURE_SCREEN

**Parameters**

  | Name  | Type                                   | Mandatory| Description                                                        |
  | -------- | --------------------------------------- | ---- | ------------------------------------------------------------ |
  | options  | [ScreenshotOptions](#screenshotoptions) | No  | Screenshot options, which consist of **screenRect**, **imageSize**, and **rotation**. You need to set these parameters.|
  | callback | AsyncCallback&lt;image.PixelMap&gt;     | Yes  | Callback used to return a **PixelMap** object.                                  |

**Example**

  ```js
  var ScreenshotOptions = {
  	"screenRect": {
  		"left": 200,
  		"top": 100,
  		"width": 200,
  		"height": 200},
  	"imageSize": {
  		"width": 300,
  		"height": 300},
  	"rotation": 0
  };
  screenshot.save(ScreenshotOptions, (err, data) => {
  	if (err) {
  		console.error('Failed to save the screenshot. Error: ' + JSON.stringify(err));
  		return;
  	}
  	console.info('Screenshot saved. Data: ' + JSON.stringify(data));
  });
  ```

## screenshot.save

save(options?: ScreenshotOptions): Promise&lt;image.PixelMap&gt;

Takes a screenshot and saves it as a **PixelMap** object. This method uses a promise to return the result.

**System capability**: SystemCapability.WindowManager.WindowManager.Core

**Required permissions**: ohos.permission.CAPTURE_SCREEN

**Parameters**

| Name | Type                                   | Mandatory| Description                                                        |
| ------- | --------------------------------------- | ---- | ------------------------------------------------------------ |
| options | [ScreenshotOptions](#screenshotoptions) | No  | Screenshot options, which consist of **screenRect**, **imageSize**, and **rotation**. You need to set these parameters.|

**Return value**

  | Type                         | Description                                           |
  | ----------------------------- | ----------------------------------------------- |
  | Promise&lt;image.PixelMap&gt; | Promise used to return an **image.PixelMap** object.|

**Example**

  ```js
  var ScreenshotOptions = {
  	"screenRect": {
  		"left": 200,
  		"top": 100,
  		"width": 200,
  		"height": 200},
  	"imageSize": {
  		"width": 300,
  		"height": 300},
  	"rotation": 0
  };
  let promise = screenshot.save(ScreenshotOptions);
  promise.then(() => {
      console.log('screenshot save success');
  }).catch((err) => {
      console.log('screenshot save fail: ' + JSON.stringify(err));
  });
  ```