I need to use iso-8859 type in flutter but the method iconv not supported, is there any other method ?
I'd convert it to a string and then convert the string to the ISO-8859-X code page that you want, which in this case is probably ISO-8859-6 Latin/Arabic.
The convert package (now) supports all the ISO-8859 code pages.
import "dart:convert" show utf8;
import "package:convert" show latinArabic;
...
var utf8Bytes = ...;
var string = utf8.decode(utf8Bytes);
var latinArabicBytes = latinArabic.encode(string);
You can create helper converter for that as:
final utf8ToLatinArabicConverter = utf8.decoder.fuse(latinArabic.encoder);
final utf8ToLatinARabic = utf8ToLatinArabicConverter.convert;
....
var latinArabicBytes = utf8ToLatinArabic(utf8Bytes);
Related
I'm a beginner in dart.
void main() {
var abf = '+37.4054-122.0999/';
var abf2;
abf2 = abf.replaceAll("+"," ");
var abf1 = abf2.split(RegExp('(?=[+-])'));
print (abf1[0]);
print (abf1[1]);
}
The above code splits abf into two values for me
I want to remove the ending '/'. I tried many split methods using other variables but it's not removing the '/' even though its removing the '+'.
It's not really clear what you're trying to do with the split.
But if you're looking the remove the / this should work:
String number = '+37.4054-122.0999/';
number = number.replaceAll("/"," ");
You can create substring from this while you like to remove last element.
String abf = '+37.4054-122.0999/';
final result = abf.substring(0, abf.length - 1);
print(result);
Dart's List class has a built-in removeLast method. Maybe you can try to split the string and then removing the last element:
String str = "str";
String newStr = str.split(''). removeLast().join('');
I need to get the name of an image path, which is a String. How could i say programmatically in dart "when you find the first / from the right hand side split it, then give it to me"?
the string which i need to split is:
'/data/data/com.example.trail/cache/IMG_1645484057312.png'
You can use split like the #scott-deagan answer for it. But if you intend to support cross-platform path manipulation, you need to use path package.
Example:
import 'package:path/path.dart' as p;
void main() {
var filepath = '/data/data/com.example.trail/cache/IMG_1645484057312.png';
print(p.basename(filepath));
print(p.basenameWithoutExtension(filepath));
}
result:
IMG_1645484057312.png
IMG_1645484057312
void main() {
var someFile = '/data/data/com.example.trail/cache/IMG_1645484057312.png';
var fname = someFile.split('/').last;
var path = someFile.replaceAll("/$fname", '');
print(fname);
print(path);
}
Here is the way I recommend you to test
First, do the split on the original string by "/" splitter, then extract the last member of the list created by the splitter to get the name of the png file.
Second, for extracting the remaining string (i.e. the file path), use the substring method of the class string. just by subtracting the original string length from the last_member length in the previous portion, you are able to get the file path string.
Hope to be useful
Bests
void main() {
String a = '/data/data/com.example.trail/cache/IMG_1645484057312.png';
var splited_a = a.split('/');
var last_image_index = splited_a.last;
String remaining_string = a.substring(0, a.length - last_image_index.length);
print(remaining_string);
print(last_image_index);
}
result:
the result of path and file extraction from a string in dart
I download an XML file in my flutter app and convert it into Dart Objects that I later want to serialize with JSON. Since JSON does not accept any invisible carriage return characters, I am looking for a way to substitute those with \n.
From your question why don't you use dart String replaceAll method.
With a simple regExp you could replace all the return carriages.
You can pass a String to the jsonEncode() function from the dart:convert library, and it will automatically replace newlines with a \, n sequence (and will quote the string).
You can pass string to json by using jsonEncode() or jsonDecode(), and you might declare variable with var
import 'dart:convert';
void main() {
var string = {
'a': 'Indication\n',
'b': 'Indication\t',
'c': 1
};
var enCode = json.encode(string);
print(enCode); // {"a":Indication\n,"b":Indication\t,"c":1}
print(jsonDecode(enCode)); // {"a":Indication
// ,"b":Indication ,"c":3}
}
I am trying to read the value from an XML element but I always get "Sequence contains to elements" error.
I already done my research but nothing works for my problem.
I want to read the Ack and Timestamp element values in this XML
<DoDirectPaymentResponse xmlns="urn:ebay:api:PayPalAPI">
<Timestamp xmlns="urn:ebay:apis:eBLBaseComponents">2014-09-16T04:41:56Z</Timestamp>
<Ack xmlns="urn:ebay:apis:eBLBaseComponents">Success</Ack>
</DoDirectPaymentResponse>
Here's my code for reading the Ack and Timestamp values
String xmlString = #xml;
using (XmlReader reader = XmlReader.Create(new StringReader(xmlString)))
{
XDocument xdoc = XDocument.Load(reader);
var timestamp = xdoc.Descendants("Timestamp").Single();
receipt.Timestamp = timestamp.Value;
var response = xdoc.Descendants("Ack").Single();
receipt.Response = response.Value;
}
Please help me with this. Thanks a lot.
You need to use proper XNamespace to access elements in the namespace :
XDocument xdoc = XDocument.Parse(xmlString);
XNamespace ns = "urn:ebay:apis:eBLBaseComponents";
var timestamp = xdoc.Descendants(ns+"Timestamp").Single();
receipt.Timestamp = timestamp.Value;
var response = xdoc.Descendants(ns+"Ack").Single();
receipt.Response = response.Value;
Side note: you can use XDocument.Parse() to load XML from XML string content.
I am extracting metadata of a song using following code ,And how I can convert the byte array (buf) to string? Please help me,Thanks in advance.
String mint = httpConnection.getHeaderField("icy-metaint");
int b = 0;
int count =0;
while(count++ < length){
b = inputStream.read();
}
int metalength = ((int)b)*16;
if(metalength <= 0)
return;
byte buf[] = new byte[metalength];
inputStream.read(buf,0,buf.length);
1). Read bytes from the stream:
// use net.rim.device.api.io.IOUtilities
byte[] data = IOUtilities.streamToBytes(inputStream);
2). Create a String from the bytes:
String s = new String(data, "UTF-8");
This implies you know the encoding the text data was encoded with before sending from the server. In the example right above the encoding is UTF-8. BlackBerry supports the following character encodings:
* "ISO-8859-1"
* "UTF-8"
* "UTF-16BE"
* "US-ASCII"
The default encoding is "ISO-8859-1". So when you use String(byte[] data) constructor it is the same as String(byte[] data, "ISO-8859-1").
If you don't know what encoding the server uses then I'd recommend to try UTF-8 first, because by now it has almost become a default one for servers. Also note the server may send the encoding via an http header, so you can extract it from the response. However I saw a lot of servers which put "UTF-8" into the header while actually use ISO-8859-1 or even ASCII for the data encoding.
String has a constructor that accepts a byte array that you can use for this.
See e.g. http://java.sun.com/javame/reference/apis/jsr139/java/lang/String.html
As #Heiko mentioned you can create string directly using the constructor. This applies to blackberry java too:
byte[] array = {1,2,3,4,5};
String str = new String(array);