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rawcane's questions

Martin Hope
rawcane
Asked: 2024-12-20 02:53:05 +0800 CST
  • 5

如果我有这样的脚本

import 'package:path/path.dart' as p;
import 'dart:io';
import 'dart:async';

void main() async {
  final inDir = p.join(Directory.current.path, 'tmp', 'in'); // should we rename this
  var dir = Directory(inDir);
  final List<FileSystemEntity> fileList = await dir.list().toList();
  for (var file in fileList.where((entity) => entity is File) ) {
    print ("Processing ${(file as File).toString()}");
    final contents = (file as File).readAsStringSync();
    print (contents);
  }
}

它工作正常。

Processing File: 'C:\FlutterProjects\project\tmp\a.txt'
some text

但是如果我想获取文件路径以字符串形式传递给另一个函数

import 'package:path/path.dart' as p;
import 'dart:io';
import 'dart:async';

void main() async {
  final inDir = p.join(Directory.current.path, 'tmp'); // should we rename this
  var dir = Directory(inDir);
  final List<FileSystemEntity> fileList = await dir.list().toList();
  for (var file in fileList.where((entity) => entity is File) ) {
    print ("Processing ${(file as File).toString()}");
    readFile ((file as File).toString());
  }
}

void readFile (String filePath) {

    final file = File(filePath); 
    final contents = file.readAsStringSync();
    print (contents);

}

...那么它就不起作用了...

Processing File: 'C:\FlutterProjects\project\tmp\a.txt'
Unhandled exception:
FileSystemException: Cannot open file, path = 'File: 'C:\FlutterProjects\project\tmp\a.txt'' (OS Error: The filename, directory name, or volume label syntax is incorrect.
, errno = 123)
#0      _File.throwIfError (dart:io/file_impl.dart:675:7)
#1      _File.openSync (dart:io/file_impl.dart:490:5)
#2      _File.readAsBytesSync (dart:io/file_impl.dart:574:18)
#3      _File.readAsStringSync (dart:io/file_impl.dart:624:18)
#4      readFile (file:///C:/FlutterProjects/project/bin/parse-files.dart:18:27)
#5      main (file:///C:/FlutterProjects/project/bin/parse-files.dart:11:5)
<asynchronous suspension>

我猜是因为它仍然以 File: 开头。所以我可以将其视为函数本身中的一个实体，或者我将字符串转换为不以 File: 开头，但我不明白为什么它不将文件的字符串作为文件发送（这正是我想要做的，以使函数更具可重用性）。

((file as File).toString());TL;DR当文件是 FileEntity 时为什么不按我期望的方式执行。

dart