FileOpen，FileRead，FileWrite [英] FileOpen, FileRead, FileWrite

问题描述

如何正确使用FileRead，FileWrite，缓冲区（或使用TFileStream）。

How to properly work with FileRead, FileWrite, buffers (or with TFileStream).

我需要读取一个整个文本文件到一个String，然后写回一个字符串到这个文件（用一个新的字符串替换）。

I need to read a whole text file to a String, then to write back a String to this file (replace it with a new string).

推荐答案

TStringList 如果您需要按照每行处理该文件，您需要什么。

TStringList is what you want if you need to deal with the file on a per-line basis.

如果您只想将其视为单个字符串blob，有 TStringStream 。

If you just want to treat it as a single string blob then there is TStringStream.

Stream := TStringStream.Create('', TEncoding.UTF8);
Try
  Stream.LoadFromFile('c:\desktop\in.txt');
  ShowMessage(Stream.DataString);

  Stream.Clear;
  Stream.WriteString('Greetings earthlings!');
  Stream.SaveToFile('c:\desktop\out.txt');
Finally
  Stream.Free;
End;

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