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Store View Properties with Paradox Table

Posted on 1998-07-02
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Last Modified: 2010-04-04
With Database Desktop that comes with Delphi, you can store view properties in a file *.tv, how do I make my program perform the same task?
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Question by:koger
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ZifNab earned 300 total points
ID: 1357023
You've to store the properties of your dbgrids to the registry or an ini-file, or any other file... You can do it by yourself, making a procedure to read and write the properties, but I think there already exist such enhanced dbgrids. So I advice you, before you begin to write it on your own, check at DSP, torry, delphi deli, DEX or any other web page for an example component. Otherwise, this isn't a bad idea to make.
ZiF.
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LVL 8

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by:ZifNab
ID: 1357024
Hi koger,

here is an example from UDDF :

Is their a way to save the column order of a grid after the user
reorders the columns via drag n drop.
I resolved this problem time ago for my one application. Following code is adapted for you, not tested, but I think it works fine. It create, save and load configuration's file for order AND SIZE too of fields. I'm at your disposal for further into something.


--------------------------------------------------------------------------------

procedure TMainForm.NewIni(const NomeIni: string);
var F: System.Text;
    i: Byte;
begin
  System.Assign(F, NomeIni);
  System.ReWrite(F);
  System.WriteLn(F, '[Campi_Ordine]');
  for i:=1 to Table1.FieldCount do
    System.WriteLn(F, 'Campo',i,'=',Table1.Fields[i-1].FieldName);
  System.WriteLn(F, '');
  System.WriteLn(F, '[Campi_Size]');
  for i:=1 to Table1.FieldCount do
    System.WriteLn(F, 'Campo',i,'=',Table1.Fields[i-1].DisplayWidth);
  System.Close(F);
end;

procedure TMainForm.SaveIni(const FN: String);
var Ini: TIniFile;
    i: Integer;
begin
  NewIni(FN);
  Ini := TIniFile.Create(FN);
  with Ini do
  begin
    for i:=1 to Table1.FieldCount do
    begin
      S:= Table1.Fields[i-1].FieldName;
      WriteString('Campi_Ordine', 'Campo'+IntToStr(i),
        Table1.Fields[i-1].FieldName);
      WriteInteger('Campi_Size', 'Campo'+IntToStr(i),
        Table1.Fields[i-1].DisplayWidth);
    end;
  end;
  Ini.Free;
end;

procedure TMainForm.LoadIni(const FN: String);
var Ini: TIniFile;
    i: Integer;
    j: Longint;
    S: String;

    function MyReadInteger(const Section, Ident: string): Longint;
    begin
      result := Ini.ReadInteger(Section, Ident, -1);
      if result=-1 then
        raise Exception.Create('Errore nel file di configurazione.');
    end;

    function MyReadString(const Section, Ident: string): String;
    begin
      result := Ini.ReadString(Section, Ident, '');
      if result='' then
        raise Exception.Create('Errore nel file di configurazione.');
    end;

begin
  Ini := TIniFile.Create(FN);
  try
    with Ini do
    begin
      for i:=1 to Table1.FieldCount do
      begin
        S:= MyReadString('Campi_Ordine', 'Campo'+IntToStr(i));
        j:= MyReadInteger('Campi_Size', 'Campo'+IntToStr(i));
        Table1.FieldByName(S).Index := i-1;
        Table1.FieldByName(S).DisplayWidth := j;
      end;
    end;
  finally
    Ini.Free;
  end;
end;

Zif.
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