I'm unable to decode the utc8 characters from string.
Below line getting from API
replace the cable if a fault is found â for example
actual string
replace the cable if a fault is found - for example
Can any one help me how to fix this ?
Thanks!!!
You can use the Charset Detector Flutter Charset Detector Package to convert it to the correct encoding.
I already used it, and it works perfectly. You just have to convert the body of the response to the desired encoding.
You pass the bodyBytes field to the package autoDecode method.
Uint8List bodyBytes = response.bodyBytes;
DecodingResult decoded = (await CharsetDetector.autoDecode(bodyBytes));
String charset = decoded.charset;
String bodyInRightEncodage = decoded.string;
The response field is a http response object.
Below line is working fine
jsonDecode(utf8.decode(response.bodyBytes, allowMalformed: true));
Related
Basically I'm trying to convert a base64 jpeg image to normal image in flutter using
Image.memory(base64Decode(stringBase64))
the image initially used to be jp/2 format which isn't supported by flutter so i converted the jp/2 base64 string to bitmap in java and then to base64 string jpeg to be able to decode it in flutter using this code :
public static String encodeToBase64(Bitmap image)
{
Bitmap immagex=image;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
immagex.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] b = baos.toByteArray();
String imageEncoded = Base64.encodeToString(b, Base64.DEFAULT);
return imageEncoded;
}
how ever when i try to decode this base64 string in flutter i'm getting this error
Invalid character (at character 77)
/9j/4AAQSkZJRgABAQAAAQABAAD/4gIoSUNDX1BST0ZJTEUAAQEAAAIYAAAAAAIQAABtbnRyUkdC
which is pointing to the last C in the given line.
i don't seem understand where does the issue come from since i can convert my base64 string to image online but in flutter it throws that exception every time
thank you very much #Jamesdlin for the solution that was given in the comments
The issue was due to whitespace in the base64 string , solved by using
base64.decode(photoBase64.replaceAll(RegExp(r'\s'), '')),
If your URI contains data after the comma as it is defined by RFC-2397. Dart's Uri class is based on RFC-3986, so you can't use it.
Split the string by a comma and take the last part of it:
String uri = 'data:image/gif;base64,...';
Uint8List _bytes = base64.decode(uri.split(',').last);
REFERENCE: https://stackoverflow.com/a/59015116/12382178
I got this base64Result from canvas.toDataURL() but I having difficulties parsing in Dart to 'UintList'
import 'dart:convert';
final String base64Result = result.toString();
print("$logTrace calling web function done ${base64Result.length}");
final bytes = base64Url.decode(base64Result);
character (at character 5)
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAARwAAAIrCAYAAAA9YyZoAAAgAElEQ...
^
'data:image/png;base64,' is part of the data URL, not part of a base-64 string. You need to extract the base-64 data from the URL first.
Luckily, the UriData class can do this all for you:
final bytes = UriData.parse(base64Result).contentAsBytes();
Now I am using this code to load a base64 image stream in flutter:
var foregroundImage;
if(counter.value.iconData != null && counter.value.iconData != "") {
Uint8List base64Decode(String source) => base64.decode(source);
Uint8List uint8list = base64Decode(counter.value.iconData);
foregroundImage = Image.memory(uint8list);
}else{
foregroundImage = defaultImage;
}
when the stream like this:
data:image/png;base64,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
show error formatexception: invalid character:
when I am parse the stream in web, it could parse successfully. why would this happen? what should I do to fix it?
The problem is that the actual base64 encoded image is after the "base64," word.
Since base64 can not contain comma symbol - you can just split the string by it and take the last part:
counter.value.iconData.split(',').last
base64Decode decodes pure base64, remove data:image/png;base64, and give rest to base64Decode function
I get the next String from my api
"à é à ó ú ü ñ \uD83D\uDE00\uD83D\uDE03\uD83D\uDE04\uD83D\uDE01\uD83D\uDE06\uD83D\uDE05"
from a response in a json format
{
'apiText': "à é à ó ú ü ñ \uD83D\uDE00\uD83D\uDE03\uD83D\uDE04\uD83D\uDE01\uD83D\uDE06\uD83D\uDE05",
'otherInfo': 'etc.',
.
.
.
}
it contains accents à é à ó ú ü ñ that are not correctly encoded and it contains emojis \uD83D\uDE00\uD83D\uDE03\uD83D\uDE04\uD83D\uDE01\uD83D\uDE06\uD83D\uDE05
so far i have tried
var json = jsonDecode(response.body)
String apiText = json['apiText'];
List<int> bytes = apiText.codeUnits;
comentario = utf8.decode(bytes);
but produces a
[ERROR:flutter/lib/ui/ui_dart_state.cc(166)] Unhandled Exception: FormatException: Invalid UTF-8 byte (at offset 21)
how can i get the correct text with accents and emoji?
Based on the fact you called response.body I assumes you are using the http package which does have the body property on Response objects.
You should note the following detail in the documentation:
This is converted from bodyBytes using the charset parameter of the Content-Type header field, if available. If it's unavailable or if the encoding name is unknown, latin1 is used by default, as per RFC 2616.
Well, it seems rather likely that it cannot figure out the charset and therefore defaults to latin1 which explains how your response got messed up.
A solution for this is to use the resonse.bodyBytes instead which contains the raw bytes from the response. You can then manually parse this with e.g. utf8.decode(resonse.bodyBytes) if you are sure the response should be parsed as UTF-8.
rewrite your function as
String utf8convert(String text) {
var bytes = text.codeUnits;
String decodedCode = utf8.decode(bytes, allowMalformed: true);
if (decodedCode.contains("�")) {
return text;
}
return decodedCode;
}
I have many strings where the accents are converted wrongfully. I take those Strings from an API, so I cannot get them in other encoding formats. As an example, the string é returns as é from the API. Is there any way I can convert these strings to show the accents correctly?
Well, you can try something like this:
import 'dart:convert';
void main() {
const input = 'é';
final output = utf8.decode(latin1.encode(input), allowMalformed: true);
print(output); // é
}
Alternative you can get the response from your web call as bytes by using bodyBytes on the response object:
https://pub.dev/documentation/http/latest/http/Response/bodyBytes.html
And parse it with: latin1.decode or whatever charset the server are sending the the data as.