是否有Dart等于C ++的“ \ n”?
在以下示例中:
for(int j=0;j<readLines.length;j++)
{
outputFile.writeAsStringSync(readLines[j], mode: FileMode.APPEND);
}
我希望将“ readLines [j]”中的文本放在单独的行中。如何做到这一点?
例如:
readLines是一个字符串列表,它包含:“嘿,我叫Cheshie”,和“谢谢大家的帮助”。
在上面的代码中,我试图使用“ outputFile”将列表的内容写入文件,并且我希望将其编写如下:
嘿,我叫Cheshie
感谢大家的帮助
即,每个readLines [j]应该写在单独的行中。
谢谢。
代码:
import 'dart:io';
void func (String foldername)
{
Directory thisFolder = new Directory (foldername);
List<File> files = thisFolder.listSync(recursive:false);
int number=1;
String oldContent='';
String newContent='';
String concatenate='';
String name='';
int nameStart;
int nameLength;
for (int i=0; i<files.length; i++)
{
if (files[i].name.endsWith('.in'))
{
oldContent=files[i].readAsStringSync(Encoding.UTF_8);
newContent=number.toString();
var Strings=[newContent, oldContent];
concatenate=Strings.join();
files[i].writeAsStringSync(concatenate);
number++;
}
// ==================== << [这里开始相关部分 ============ ======
nameLength=files[i].name.length;
nameStart=files[i].name.lastIndexOf('\\', nameLength);
name=files[i].name.slice(nameStart+1, nameLength);
if (name.compareTo('hello.in')==0)
{
File outputFile=new File('hello.out');
if (outputFile.existsSync())
{
outputFile.deleteSync();
}
outputFile.createSync();
List<String> readLines=files[i].readAsLinesSync(Encoding.UTF_8);
for(int j=0;j<readLines.length;j++)
{
outputFile.writeAsStringSync('$readLines[j]\n', mode: FileMode.APPEND);
//outputFile.writeAsStringSync('\n', mode: FileMode.APPEND);
// TODO: figure out how to get to the next line.
if (readLines[j].contains('you'))
print(readLines[j]);
}
}
}
}
void main ()
{
func('In files');
print('the end!');
}
\n
不是C ++特有的,您可以将其添加到字符串的末尾,然后再将其写入文件。因此,请使用类似的内容outputFile.writeAsStringSync('${readLines[j]}\n', mode: FileMode.APPEND);
readLines[j]
的内容是什么?一堆词?假设类似这样:
var readLines = [
'Dart is fun',
'It is easy to learn'
];
并且假设您要输出以下内容:
Dart is fun It is easy to learn
尝试一下:
for (String line in readLines) { String split = line.replaceAll(new RegExp(r'\s+'), '\n'); outputFile.writeAsStringSync(split, mode: FileMode.APPEND); }
void main() {
print('word\nsecondword');
}
控制台:
word secondword