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Docs for FFUploadedFile

As a supported return type of Custom Actions, docs for Docs for FFUploadedFile needed. Here is a start by ChatGPT:

FlutterFlow FFUploadedFile Documentation

Overview

FFUploadedFile is a custom object in FlutterFlow that represents a file that has been uploaded to a backend server or cloud storage. It typically contains properties like the file name, URL, and any other metadata associated with the file.

When to Use

Use FFUploadedFile when you want to upload files from your FlutterFlow app and keep track of their metadata, such as when users upload profile pictures, documents, or other media.

Properties

An FFUploadedFile typically includes the following properties:

  • name: The name of the file.

  • bytes: The binary data of the file, represented as Uint8List.

  • uploadUrl: The URL where the file is stored on the backend or cloud storage.

Example

Let's say you want to allow users to upload a profile picture and store it in your backend.

Step 1: Define FFUploadedFile

First, you need a way to define FFUploadedFile. You can create a Dart file named uploaded_file.dart with the following content:

import 'dart:typed_data';

class FFUploadedFile {
  String name;
  Uint8List bytes;
  String? uploadUrl; // This will be filled in after the file is uploaded.

  FFUploadedFile({
    required this.name,
    required this.bytes,
    this.uploadUrl,
  });
}

Step 2: Pick a File

Next, you need to let the user pick a file from their device:

import 'package:file_picker/file_picker.dart';

Future<FFUploadedFile?> pickProfilePicture() async {
  final result = await FilePicker.platform.pickFiles(type: FileType.image);
  if (result != null && result.files.single.bytes != null) {
    return FFUploadedFile(
      name: result.files.single.name,
      bytes: result.files.single.bytes!,
    );
  } else {
    // User canceled the picker or picked file was invalid.
    return null;
  }
}

Step 3: Upload the File

After picking the file, you'll upload it to your backend or storage service:

Future<String?> uploadFile(FFUploadedFile file) async {
  // Your file upload logic here
  // This should return the URL of the uploaded file.
  // For demonstration, we'll pretend to return a URL.
  return 'https://example.com/uploads/${file.name}';
}

Step 4: Usage

Finally, you can use these functions in your FlutterFlow app to pick and upload a file:

Future<void> uploadProfilePicture() async {
  final file = await pickProfilePicture();
  if (file != null) {
    final uploadUrl = await uploadFile(file);
    if (uploadUrl != null) {
      // Update the user's profile with the new picture URL.
      setState(() {
        file.uploadUrl = uploadUrl;
        // Save the file URL to the user's profile in your database.
      });
    }
  }
}

Notes

  • Ensure you handle permissions for file access, especially for Android API level 29+ due to scoped storage enforcement.

  • You may need to handle exceptions and errors for file picking and uploading, which aren't covered in this basic example.

Working with Local Files on the Device

In some scenarios, you might want to work with local files on the user's device, such as audio recordings or downloaded files. To handle these files and convert them into a format that can be used within FlutterFlow, you can use FFUploadedFile.

Here is how you can convert local file data to FFUploadedFile:

Step 1: Create a Function to Read File Bytes

First, you need a function that reads the bytes from a local file and returns them as Uint8List. This is useful for getting the binary data of the file:

import 'dart:io';
import 'dart:typed_data';

Future<Uint8List> fileToBytes(String filePath) async {
  File file = File(filePath);
  return await file.readAsBytes();
}

Step 2: Convert Local File to FFUploadedFile

Once you have the binary data, you can convert it to FFUploadedFile which can be uploaded to your backend or used in FlutterFlow as needed:

import 'package:your_project_path/flutter_flow/uploaded_file.dart';

Future<FFUploadedFile?> localFileToFFUploadedFile(String filePath) async {
  Uint8List fileBytes = await fileToBytes(filePath);
  // You would typically upload the file here and get an URL.
  // For the purpose of this example, let's assume that the upload function returns a URL.
  String uploadUrl = await uploadFile(fileBytes);
  return FFUploadedFile(
    name: filePath.split('/').last,
    bytes: fileBytes,
    uploadUrl: uploadUrl,
  );
}

Future<String> uploadFile(Uint8List fileBytes) async {
  // Your file upload logic here
  // This should return the URL of the uploaded file.
  // For demonstration, let's pretend this function uploads the file and returns a URL.
  return 'https://example.com/uploads/${DateTime.now().millisecondsSinceEpoch}';
}

Step 3: Use the FFUploadedFile

Now you can use the FFUploadedFile in your FlutterFlow app:

Future<void> uploadUserAudio() async {
  String localFilePath = '/path/to/audio.mp3';
  FFUploadedFile? uploadedFile = await localFileToFFUploadedFile(localFilePath);
  if (uploadedFile != null) {
    // Use the uploaded file as needed in your FlutterFlow app
    // For example, save the upload URL to the user's profile
  }
}

Notes

  • Ensure that you have the necessary permissions to read files from the user's device storage.

  • The actual implementation of file uploading depends on your backend or cloud storage solution.

  • Handle exceptions and errors that may occur during file reading and uploading.

This documentation assumes that you have a function named uploadFile that takes the binary data of a file (Uint8List) and uploads it to your backend or storage, returning a URL to the uploaded file. You'll need to implement this function according to your project's requirements.

Please replace 'package:your_project_path/flutter_flow/uploaded_file.dart' with the actual path to your FFUploadedFile definition. The example uses placeholders and simplifications for demonstration purposes; in a real app, you would have more complex logic to handle file uploads and error handling.

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