When a user needs to download a file from the network to a local directory or save a user file into another directory, use **FilePicker** to save the file.
When a user needs to download a file from the network to a local directory or save a user file into another directory, use **FilePicker** to save the file.
The operations for saving images, audio or video clips, and documents are similar. Call **save()** of the corresponding picker instance and pass in **saveOptions**.
The operations for saving images, audio or video clips, and documents are similar. Call **save()** of the corresponding picker instance and pass in **saveOptions**. No permission is required if **FilePicker** is used to access files.
The **save()**interface saves the file in the file manager, not in the Gallery.
The **save()**method saves the file in the file manager, not in the Gallery.
## Saving Images or Video Files
## Saving Images or Video Files
1. Import the **picker** module and **fs** module.
For example, select an image from **Gallery** and save it to the file manager.
1. Import the [picker](../reference/apis/js-apis-file-picker.md), [fs](../reference/apis/js-apis-file-fs.md), [photoAccessHelper](../reference/apis/js-apis-photoAccessHelper.md), and [dataSharePredicates](../reference/apis/js-apis-data-dataSharePredicates.md) modules.
3. Create a **photoViewPicker** instance and call [save()](../reference/apis/js-apis-file-picker.md#save) to open the **FilePicker** page to save the files. After the user selects the target folder, the file saving operation is complete. After the files are saved successfully, the URIs of the files saved are returned.
3. Create a **photoViewPicker** instance and call [save()](../reference/apis/js-apis-file-picker.md#save) to open the **FilePicker** page to save the image. After the user selects the target folder, the file saving operation is complete. After the image is saved successfully, the URI of the saved image is returned.
The permission on the URIs returned by **save()** is read/write. Further file operations can be performed based on the URIs in the result set. Note that the URI cannot be directly used in the **picker** callback to open a file. You need to define a global variable to save the URI and use a button to trigger file opening.
The permission on the URI returned by **save()** is read/write. Further operations can be performed based on the URI in the result set. Note that the URI cannot be directly used in the **picker** callback to open a file. You need to define a global variable to save the URI and use a button to trigger file opening.
constphotoSaveOptions=newpicker.PhotoSaveOptions();// Create a photoSaveOptions instance.
console.info('photoViewPicker.save to file succeed and uri is:'+uri);
photoSaveOptions.newFileNames=["PhotoViewPicker01.png"];// (Optional) Name of the file to be saved. The file name in the square brackets can be customized and must be unique. If the file name already exists on the device, change the file name. Otherwise, an error will be returned.
}).catch((err)=>{
console.error(`Invoke photoViewPicker.save failed, code is ${err.code}, message is ${err.message}`);
4. Use a button to trigger invocation of other functions. Use [fs.openSync()](../reference/apis/js-apis-file-fs.md#fsopensync) to open the file based on the URI and obtain the FD. Note that the **mode** parameter of **fs.openSync()** must be **fs.OpenMode.READ_WRITE**.
4. Use a button to trigger invocation of other functions. Use [fs.openSync()](../reference/apis/js-apis-file-fs.md#fsopensync) to open the file based on the URI and obtain the FD. Note that the **mode** parameter of **fs.openSync()** must be **fs.OpenMode.READ_WRITE**.
```ts
Use [fs.write](../reference/apis/js-apis-file-fs.md#fswrite) to edit and modify the file based on the FD. After the modification is complete, close the FD.
letfile=fs.openSync(uri,fs.OpenMode.READ_WRITE);
console.info('file fd: '+file.fd);
```
5. Use [fs.writeSync()](../reference/apis/js-apis-file-fs.md#writesync) to edit the file based on the FD, and then close the FD.
```ts
```ts
letwriteLen=fs.writeSync(file.fd,'hello, world');
asyncwriteOnly(uri){
console.info('write data to file succeed and size is:'+writeLen);
**Picker** encapsulates the system applications such as **PhotoViewPicker**, **DocumentViewPicker** and **AudioViewPicker** to provide capabilities of selecting and saving files of different types. The application can select the picker as required.
> **NOTE**
> **NOTE**
>
>
> 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.
> 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.
**Picker** encapsulates the system applications such as **PhotoViewPicker**, **DocumentViewPicker** and **AudioViewPicker** to provide capabilities of selecting and saving files of different types. The application can select the picker as required.
Saves one or more images or videos in a **photoPicker** page. This API uses a promise to return the result. You can pass in **PhotoSaveOptions** to specify the file names of the images or videos to save.
Saves one or more images or videos in a **photoPicker** page. This API uses a promise to return the result. You can pass in **PhotoSaveOptions** to specify the file names of the images or videos to save. The **save()** API saves the file in the file manager, not in the Gallery.
Saves one or more images or videos in a **photoPicker** page. This API uses an asynchronous callback to return the result. You can pass in **PhotoSaveOptions** to specify the file names of the images or videos to save.
Saves one or more images or videos in a **photoPicker** page. This API uses an asynchronous callback to return the result. You can pass in **PhotoSaveOptions** to specify the file names of the images or videos to save. The **save()** API saves the file in the file manager, not in the Gallery.
Saves one or more images or videos in a **photoPicker** page. This API uses an asynchronous callback to return the result.
Saves one or more images or videos in a **photoPicker** page. This API uses an asynchronous callback to return the result. The **save()** API saves the file in the file manager, not in the Gallery.
