Flutter Base64编码字符串不完整

Question

我正在尝试将图像字节转换为base64编码的字符串，此操作是成功的，但是当我打印出编码的字符串时，我得到了ff：

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

编码字符串应该比上面的字符更多。现在，当我尝试通过将data:image/jpeg;base64附加到编码字符串的开头来查看此内容时，不会显示任何内容。

是颤动切割控制台中的字符串或什么，如果是，那么我如何获得完整的编码字符串。

Answer 1

如果您尝试将其发送到后端，则应将其转换为字节。这将为您提供您正在寻找的长字符串;）

var params = {
      "image_file": base64Encode(_selectedImage.readAsBytesSync()),
    };

Answer 2

How to native convert string -> base64 and base64 -> string展示了如何base64编码

Dart还在Uri类上提供构造函数以获取数据URL

• https://api.dartlang.org/stable/2.1.0/dart-core/Uri/Uri.dataFromBytes.html
• https://api.dartlang.org/stable/2.1.0/dart-core/Uri/Uri.dataFromString.html

前者为您执行base64编码，后者使用已编码的字符串。