How to read bytes of a local image file in Dart/Flutter?

Question

I would like to use a placeholder image file that I\'ve added to my code as \"assets/placeholder.png\", but I\'m getting a File not found error. This is how I\

Answer 1

In dart Uint8List is equal to byte[].

1. Create one function and pass file path, It will return Bytes.

   Future _readFileByte(String filePath) async {
       Uri myUri = Uri.parse(filePath);
       File audioFile = new File.fromUri(myUri);
       Uint8List bytes;
       await audioFile.readAsBytes().then((value) {
       bytes = Uint8List.fromList(value); 
       print('reading of bytes is completed');
     }).catchError((onError) {
         print('Exception Error while reading audio from path:' +
         onError.toString());
     });
     return bytes;
   }
   

2. Now call the function in to get bytes of file.

   try{
     Uint8List audioByte;
     String myPath= 'MyPath/abc.png';
     _readFileByte(myPath).then((bytesData) {
       audioByte = bytesData;
     //do your task here 
     });
   } catch (e) {
      // if path invalid or not able to read
     print(e);
   }
   

3. If you want base64String then use below code:

   String audioString = base64.encode(audioByte);

for base64 import 'dart:convert';

I hope it will help!