CODEWITHSUNDEEP
delphiini
ikathegreat
ikathegreat

Reputation: 2331

Incrementing an INI file's section number

I have an INI file that stores some integers for settings. The section names are stored like this:

[ColorScheme_2]
name=Dark Purple Gradient
BackgroundColor=224
BackgroundBottom=2
BackgroundTop=25
...

[ColorScheme_3]
name=Retro
BackgroundColor=5
BackgroundBottom=21
BackgroundTop=8
...

I need to figure out a way to create new sections, that increment the color scheme number +1 from the highest section number. I have a comboBox that lists out the current colorscheme names, so when a user saves to the INI file, the existing scheme is just overwritten. How can I check the ComboBox text to see if it is an existing section and if not, create a new one with an incremented name? (i.e. from the example code above, ColorScheme_2 and ColorScheme_3 already exist, so the next section to create would be ColorScheme_4).

Upvotes: 2

Views: 3198

Answers (2)

Remy Lebeau
Remy Lebeau

Reputation: 597205

How can I check the ComboBox text to see if it is an existing section and if not, create a new one with an incremented name?

Like this:

const
  cPrefix = 'ColorScheme_';
var
  Ini: TIniFile;
  Sections: TStringList;
  SectionName: String;
  I, Number, MaxNumber: Integer;
begin
  Ini := TIniFile.Create('myfile.ini')
  try
    SectionName := ComboBox1.Text;
    Sections := TStringList.Create;
    try
      Ini.ReadSections(Sections);
      Sections.CaseSensitive := False;
      if Sections.IndexOf(SectionName) = -1 then
      begin
        MaxNumber := 0;
        for I := 0 to Sections.Count-1 do
        begin
          if StartsText(cPrefix, Sections[I]) then
          begin
            if TryStrToInt(Copy(Sections[I], Length(cPrefix)+1, MaxInt), Number) then
            begin
              if Number > MaxNumber then
                MaxNumber := Number;
            end;
          end;
        end;
        SectionName := Format('%s%d', [cPrefix, MaxNumber+1]);
      end;
    finally
      Sections.Free;
    end;
    // use SectionName as needed...
  finally
    Ini.Free;
  end;
end;

Upvotes: 4

TLama
TLama

Reputation: 76713

You can read all sections by using ReadSections method, then iterate returned string list and parse each item in it to store the highest found index value:

uses
  IniFiles;

function GetMaxSectionIndex(const AFileName: string): Integer;
var
  S: string;
  I: Integer;
  Index: Integer;
  IniFile: TIniFile;
  Sections: TStringList;
const
  ColorScheme = 'ColorScheme_';
begin
  Result := 0;
  IniFile := TIniFile.Create(AFileName);
  try
    Sections := TStringList.Create;
    try
      IniFile.ReadSections(Sections);
      for I := 0 to Sections.Count - 1 do
      begin
        S := Sections[I];
        if Pos(ColorScheme, S) = 1 then
        begin
          Delete(S, 1, Length(ColorScheme));
          if TryStrToInt(S, Index) then
            if Index > Result then
              Result := Index;
        end;
      end;
    finally
      Sections.Free;
    end;
  finally
    IniFile.Free;
  end;
end;

And the usage:

procedure TForm1.Button1Click(Sender: TObject);
begin
  ShowMessage(IntToStr(GetMaxSectionIndex('d:\Config.ini')));
end;

Upvotes: 8

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