如何在字符串中存储和加载键值对列表？

Question

I have a list of strings and the values they are to be replaced with. I'm trying to combine them in a list like 'O'='0',' .'='.', ... so it's easy for me to edit it and add more pairs of replacements to make.

Right now the best way I could think of it is:

var
  ListaLimpeza : TStringList;
begin
  ListaLimpeza := TStringList.Create;

  ListaLimpeza.Delimiter := '|';
  ListaLimpeza.QuoteChar := '"';
  ListaLimpeza.DelimitedText := 'O=0 | " .=."';

  ShowMessage('1o Valor = '+ListaLimpeza.Names[1]+' e 2o Valor = '+ListaLimpeza.ValueFromIndex[1]);

This works, but it's not good for visuals, since I can't code the before string (for ex ' .' ) like that (which is very visual for the SPACE character), only like ( " . ) so that the = works to assign a name and value in the TStringList.

Answer 1

The Names and Values by default have to be separated by = , in the style of Windows INI files. There's no way AFAICT to change that separator. As @SirRufo indicates in the comment (and which I had never noticed), you can change that using the TStringList.NameValueSeparator property.

This will give you an idea of what Delphi thinks is in your TStringList , which is not what you think it is:

procedure TForm1.FormCreate(Sender: TObject);
var
  SL: TStringList;
  Temp: string;
  i: Integer;
begin
  SL := TStringList.Create;
  SL.Delimiter := '|';
  SL.QuoteChar := '"';
  SL.StrictDelimiter := True;
  SL.DelimitedText := 'O=0 | ! .!=!.!';
  Temp := 'Count: ' + IntToStr(SL.Count) + #13;
  for i := 0 to SL.Count - 1 do
    Temp := Temp + Format('Name: %s Value: %s'#13, 
              [SL.Names[i], SL.ValueFromIndex[i]]);
  ShowMessage(Temp);
end;

This produces this output:

TStringList Names/Values probably isn't going to do what you need. It's not clear what your actual goal is, but it appears that a simple text file with a simple list of text|replacement and plain parsing of that file would work, and you can easily use TStringList to read/write from that file, but I don't see any way to do the parsing easily except to do it yourself. You could use an array to store the pairs when you parse them:

type
  TReplacePair = record
    TextValue: string;
    ReplaceValue: string;
  end;

  TReplacePairs = array of TReplacePair;

function GetReplacementPairs: TReplacePairs;
var
  ConfigInfo: TStringList;
  i, Split: Integer;
begin
  ConfigInfo := TStringList.Create;
  try
    ConfigInfo.LoadFromFile('ReplacementPairs.txt');
    SetLength(Result, ConfigInfo.Count);
    for i := 0 to ConfigInfo.Count - 1 do
    begin
      Split := Pos('|`, ConfigInfo[i];
      Result[i].TextValue := Copy(ConfigInfo[i], 1, Split - 1);
      Result[i].ReplaceValue := Copy(ConfigInfo[i], Split + 1, MaxInt);
    end;
  finally
    ConfigInfo.Free;
  end;
end;

You can then populate whatever controls you need to edit/add/delete the replacement pairs, and just reverse the read operation to write them back out to save.