我通过这种方式从用户设备上传文件:
void uploadImage() async {
html.InputElement uploadInput = html.FileUploadInputElement();
uploadInput.click();
uploadInput.onChange.listen(
(changeEvent) {
final file = uploadInput.files.first;
final reader = html.FileReader();
reader.readAsDataUrl(file);
reader.onLoadEnd.listen(
(loadEndEvent) async {
setState(() {
image = file; //image is a dart:html File object, it's a field of my statefulwidget
});
},
);
},
);
}
}
我想显示这张图片。我尝试使用Image.file:
Container(
width: 100,
height: 100,
child: Image.file(
image,
fit: BoxFit.contain,
),
),
但是这给了我这个错误:
无法将参数类型“文件”(其中文件在C:\ Users \ Asus \ Documents \ flutter \ bin \ cache \ pkg \ sky_engine \ lib \ html \ html_dart2js.dart中定义)分配给参数类型“ File” (其中File在C:\ Users \ Asus \ Documents \ flutter \ bin \ cache \ pkg \ sky_engine \ lib \ io \ file.dart中定义)'。dartargument_type_not_assignable html_dart2js.dart(15975,7):文件在C:\ Users \ Asus \ Documents \ flutter \ bin \ cache \ pkg \ sky_engine \ lib \ html \ html_dart2js.dart中定义 file.dart(241,16):文件在C:\ Users \ Asus \ Documents \ flutter \ bin \ cache \ pkg \ sky_engine \ lib \ io \ file.dart中定义 偷看问题(Alt + F8) 没有可用的快速修复
有没有办法将dart:html文件转换为dart:io文件?还是我应该尝试另一种显示图像的方式?在这种情况下,如何显示dart:html文件?谢谢您的帮助!
答案 0 :(得分:1)
一种解决方案是使用image_whisperer软件包。
让我们说您的html.File
是变量myfile
,以下对我有用:
import 'package:flutter/painting.dart'; // NetworkImage
import 'package:image_whisperer/image_whisperer.dart'; // BlobImage
...
BlobImage blobImage = new BlobImage(myfile, name: myfile.name);
final image = NetworkImage(blobImage.url);
// Use image here
...