DART somo la 23: Jinsi ya kusoma mafaili kwa kutumia Dart

Kabla ya kuendelea na somo, kwanza tengeneza faili kwa kutumia note pad, hilo faili liite dart.txt zingatia wakati wa ku save chaguwa seve as type, weka all files kisha ndipo utaweka hilo jina dart.txt kisha hilo faili liweke kwenye folder lenye project yako ya Dart.

Hilo faili ndio tunakwenda kulifanyia kazi katika somo hili. Tutakwenda kujifunza kupata taarifa za faili, kulisoma na kuandika data. Pia tutakwend akujifunz akutengeneza faili lingine.

Ndani ya hilo faili lako weka maneneo haya 

Karib bongoclass

Haya ni mafunzo ya dart programming

Jinsi ya kusoma faili:

Sasa ili tuweze kusoma faililetu tutatumia method hii readAsSteingSync() ila kabla ya hapo tutatakiwa kutengeneza file object kwa kutumia function File() ndani yake tutaweka jina la faili. Pia kama faili lipo kwenye directory ama folda lingine utaweka link yake hapo ndani ya hiyo function. Jambo la kuzingatia zaidi ni ku import io library.

Mfano

import 'dart:io';

void main() {

 // tengeneza file object

 File file = File('dart.txt');

 // soma file

 String contents = file.readAsStringSync();

 // print file

 print(contents);

}

Pia unaweza kusoma faili kw akutumia split()

import 'dart:io';

void main() {

 // open file

 File file = File('dart.txt');

 // read file

 String contents = file.readAsStringSync();

 // split file using new line

 List<String> lines = contents.split(' ');

 // print file

 print('---------------------');

 for (var line in lines) {

   print(line);

 }

}

Angal...