无法从字符串中删除`Null Characters` [英] Cannot remove `Null Characters` from a string

问题描述

我问过类似的问题几个月前。感谢 Rob Kennedy 我可以将我的整个文字载入 Richedit 但我无法删除 Null chars 。我可以加载我的文本，因为我使用 Stream 。

I asked a similar question couple months ago. Thanks to Rob Kennedy I could load my whole text into a Richedit BUT I couldn't remove Null chars. I could load my text because I used Stream.

现在在此代码中：

var
  strm : TMemorystream;
  str  : UTF8string;
  ss   : TStringstream;

begin
  strm := tmemorystream.Create;

  try
    strm.LoadFromFile('C:\Text.txt');
    setstring(str,PAnsichar(strm.Memory),strm.Size);
    str := StringReplace(str, #0, '', [rfReplaceAll]);  //This line doesn't work at all
    ss  := tstringstream.Create(str);
    Richedit1.Lines.LoadFromStream(ss);
  finally
    strm.Free;
    ss.Free;
  end;
end;

我将 TMemorystream 转换为 string 使用 StringReplace（）删除 Null Chars TStringstream 加载 Richedit.lines.LoadFromStream 。

I converted TMemorystream to string to remove Null Chars with StringReplace() and then converted it again to TStringstream to load it with Richedit.lines.LoadFromStream.

但我的问题是，我不能删除空字符使用 StringReplace（）。我可以替换其他字符，但不能替换＃0 。

But my problem is that I can't remove Null Character using StringReplace(). I can replace other characters but not #0.

c $ c> TMemorystream 并将其加载到 Richedit 中？怎么样？如果不可能或非常复杂，当我将文本转换为 string ？时，如何删除它们？

Is there any way to remove null charcters directly in TMemorystream and load it into a Richedit? How? If it's not possible or it's very complex, how can I remove them when I convert my text to string?

感谢。

推荐答案

据我所见，所有搜索/替换实用程序， PChar，其中'＃0'是终止字符。因此，它们不会超过第一个Null之前的字符串部分。你可能需要设计自己的机制。只是一个快速示例：

As far as I can see, all searching/replacing utilities, at one time or other, cast the input to a PChar, which '#0' is the termination character. Hence they never go past the string part that's before the first Null. You may need to devise your own mechanism. Just a quick example:

var
  i: Integer;
begin
  Assert(str <> '');
  i := 1;
  while i <= Length(str) do
    if str[i] = #0 then
      Delete(str, i, 1)
    else
      Inc(i);

在流中替换将类似地包括测试每个字符，然后在移动之前相应地调整流决定删除一个。

Replacing in the stream would similarly involve testing each character and then adjusting the stream accordingly before moving on after you decide to delete one.

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