TStringList 常用操作

//TStringList 常用方法与属性:
var
  List: TStringList;
  i: Integer;
begin
  List := TStringList.Create;
  List.Add('Strings1');           {添加}
  List.Add('Strings2');
  List.Exchange(0,1);             {置换}
  List.Insert(0,'Strings3');      {插入}
  i := List.IndexOf('Strings1');  {第一次出现的位置}
  List.Sort;                      {排序}
  List.Sorted := True;		  {指定排序}
  List.Count;                     {总数}
  List.Text;                      {文本集合}
  List.Delete(0);                 {删除, 0是第一个数据}
  List.LoadFromFile('c:\tmp.txt');{打开}
  List.SaveToFile('c:\tmp.txt');  {保存}
  List.Clear;                     {清空}
  List.Free;                      {释放}
end;

 
//读入字符串 var List: TStringList; begin List := TStringList.Create; List.CommaText := 'aaa,bbb,ccc,ddd'; //相当于: List.Text := 'aaa' + #13#10 + 'bbb' + #13#10' + 'ccc' + '#13#10' + 'ddd'; ShowMessage(IntToStr(List.Count)); //4 ShowMessage(List[0]); //aaa List.Free; end;
//置换分隔符 var List: TStringList; begin List := TStringList.Create; List.Delimiter := '|'; List.DelimitedText := 'aaa|bbb|ccc|ddd'; ShowMessage(IntToStr(List.Count)); //4 ShowMessage(List[0]); //aaa List.Free; end;
//类似的哈希表操作法 var List: TStringList; begin List := TStringList.Create; List.Add('aaa=111'); List.Add('bbb=222'); List.Add('ccc=333'); List.Add('ddd=444'); ShowMessage(List.Names[1]); //bbb ShowMessage(List.ValueFromIndex[1]); //222 ShowMessage(List.Values['bbb']); //222 //ValueFromIndex 可以赋值: List.ValueFromIndex[1] := '2'; ShowMessage(List[1]); //bbb=2 //可以通过 Values 赋值: List.Values['bbb'] := '22'; ShowMessage(List[1]); //bbb=22 List.Free; end;
//避免重复值 var List: TStringList; begin List := TStringList.Create; List.Add('aaa'); List.Sorted := True; //需要先指定排序 List.Duplicates := dupIgnore; //如有重复值则放弃 List.Add('aaa'); ShowMessage(List.Text); //aaa //Duplicates 有3个可选值: //dupIgnore: 放弃; //dupAccept: 结束; //dupError: 提示错误. List.Free; end;
//排序与倒排序 {排序函数} function DescCompareStrings(List: TStringList; Index1, Index2: Integer): Integer; begin Result := -AnsiCompareText(List[Index1], List[Index2]); end; procedure TForm1.Button1Click(Sender: TObject); var List: TStringList; begin List := TStringList.Create; List.Add('bbb'); List.Add('ccc'); List.Add('aaa'); //未排序 ShowMessage(List.Text); //bbb ccc aaa //排序 List.Sort; ShowMessage(List.Text); //aaa bbb ccc //倒排序 List.CustomSort(DescCompareStrings); //调用排序函数 ShowMessage(List.Text); //ccc bbb aaa //假如: List.Sorted := True; List.Add('999'); List.Add('000'); List.Add('zzz'); ShowMessage(List.Text); //000 999 aaa bbb ccc zzz end;
//待续...

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