如何将映像转换为base64并将base64转换为image？我的方法行不通
问题描述：
这是示例代码。
var image = await ImagePicker.pickImage(source: ImageSource.camera);
var stringBytes = base64.encode(image.readAsBytesSync());
var bytes = base64.decode(stringBytes);
var newImage = new File.fromRawPath(bytes);
I/flutter (14608): The following FileSystemException was thrown resolving an image codec:
I/flutter (14608): Cannot open file, path = '����*�Exif
I/flutter (14608):
I/flutter (14608):
I/flutter (14608): Business
I/flutter (14608): 11:42:34
I/flutter (14608): �
I/flutter (14608):
I/flutter (14608): ��
I/flutter (14608): ��
I/flutter (14608): %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz���������������������������������������������������������������������������
I/flutter (14608): ��
I/flutter (14608): $4�%�&'()*56789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz��������������������������������������������������������������������������
I/flutter (14608): ��ت���U-%�����^
I/flutter (14608): }�m���
I/flutter (14608): u���V�N6R���
I/flutter (14608): j_8}W,1�ڹ�?ܻw^��� ��6��ꗚm���E[ϓ�������>���X�W��y������=�[!��2!ډ�'8�Mk^ܾ��eS�
和lis未知字符的数量还在继续。
and the list of unknown characters continues.
我在做什么错了？
我想在base64中进行转换，因为我将其添加到数据库中。
I want to convert it in base64 because I am going to add it in a database.
答
不，不，您正在传递图像的内容以创建一个新的图像。
Nah, you're passing the content of the image to create a new file with the content as raw path, this cannot work.
new File.fromRawPath 可以做到，根据文档：
从原始路径创建File对象，即，以操作系统表示的
字节序列。
Creates a File object from a raw path, that is, a sequence of bytes as represented by the OS.
您要做的是创建一个文件并将内容存储到该文件中，可以这样做（来源）：
What you want to do is to create a file and store the content to that file, this can be done like that (Source):
var imageFile = File('myimage.jpg');
var sink = imageFile.openWrite();
sink.write(bytes);
await sink.flush();
await sink.close();