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Saving ListView Items to String (and Restoring ListView Items from String) ????

Posted on 2008-10-25
8
626 Views
Last Modified: 2011-10-19
I allow my users to build a filter string, from a form. They seelct combobox items and enter values in edit boxes, and click the add button to add the filter criteria to a ListView control (3 columns).

Field, Operator, Value

Example:  Year = 2008

The problem is, that the third colum could have values which include a space in the string

example:  Finish = Antique Silver

When there is a space, things get truncated and i loose half of the string

see code snipplets
function ListViewToFilter(LV: TListView): String;

var

  Items: TStringList;

  I: Integer;

  Part1, Part2, Part3: String;

begin

  Items := TStringList.Create;

  for I := 0 to LV.Items.Count - 1 do

  begin

   Part1:= LV.Items[I].Caption;

   Part2:= LV.Items[I].SubItems[0];

   Part3:= LV.Items[I].SubItems[1];

   if Part3 = '' then Part3:= QuotedStr(Part3);

   Items.Add(Part1 +',' + Part2 + ',' + Part3);

  end;

  result:= Items.Text;

end;
 

procedure FilterToListView(FStr: String; LV: TListView);

var

 SL, RL: TStringList;

 LI: TListItem;

 I: Integer;

begin

 SL:= TStringList.Create;

 SL.Text:= Copy(FStr, 2, pos(']', FStr)-2);

 LV.Items.Clear;

 for I:= 0 to SL.Count-1 do

 begin

  LI:= LV.Items.Add;

  RL:= TSTringList.Create;

  RL.CommaText:= SL[I];

  LI.Caption:= RL[0];

  LI.SubItems.Add(RL[1]);

  LI.SubItems.Add(RL[2]);

  RL.Free;

 end;

 SL.Free;

end;

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Question by:geocoins-software
  • 6
8 Comments
 
LVL 15

Expert Comment

by:mikelittlewood
ID: 22805672
That is because you set the value sl.text, it sees the space as a new word and adds a second entry for it.
0
 

Author Comment

by:geocoins-software
ID: 22805688
yes, i figured it was that - and i tried CommaText, but it doesn't work either.

Do you have a fix?
0
 
LVL 37

Accepted Solution

by:
Geert Gruwez earned 500 total points
ID: 22806130
use Delimited Text and AnsiDequotedStr
and use 2 StringLists to inflate or deflate
function ListViewToFilter(LV: TListView): String;

var

  Filter: Items: TStringList;

  I: Integer;

begin

  Filter := TStringList.Create;

  try

    Items := TStringList.Create;

    try

      Items.Delimiter := ';';

      for I := 0 to LV.Items.Count - 1 do

      begin

        Items.Clear;

        Items.Add(QuotedStr(LV.Items[I].Caption)));

        Items.Add(QuotedStr(LV.Items[I].SubItems[0]));

        Items.Add(QuotedStr(LV.Items[I].SubItems[1]));

        Filter.Add(Items.DelimitedText);

      end;

    finally

      FreeAndNil(Items);

    end;

    result:= Filter.Text;

  finally

    FreeAndNil(Filter);

  end;

end;

 

procedure FilterToListView(FStr: String; LV: TListView);

var

 SL, RL: TStringList;

 LI: TListItem;

 I: Integer;

begin

  LV.Items.Clear; 

  SL:= TStringList.Create;

  try

    SL.Text := FStr; 

    RL:= TSTringList.Create;

    try

      RL.Delimiter := ';';

      for I:= 0 to SL.Count-1 do

      begin

        RL.DelimitedText := SL[I];

        LI:= LV.Items.Add;

        LI.Caption:= AnsiDequotedStr(RL[0]);

        LI.SubItems.Add(AnsiDequotedStr(RL[1]));

        LI.SubItems.Add(AnsiDequotedStr(RL[2]));

      end;

    finally

      FreeAndNil(RL);

    end;

  finally

    FreeAndNil(SL);

  end; 

end;

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0
 

Author Comment

by:geocoins-software
ID: 22807366
Geert_Gruwez:

I have posted screenshots of your code in action

Screenshot 1 is what the filter string would look like stored in the registry after using the

ListViewToFilter

Screenshot2 is what the ListView would look like after using the

FilterToListView

thanks



screenshot1.jpg
screenshot2.jpg
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Author Comment

by:geocoins-software
ID: 22807426
Should look like this
screenshot3.jpg
0
 

Author Comment

by:geocoins-software
ID: 22807464
Geert_Gruwez:

Disregard my last two comments. I found a bug on my side....i will get back to you

0
 

Author Closing Comment

by:geocoins-software
ID: 31510028
GREAT!  Thanks.
0
 

Author Comment

by:geocoins-software
ID: 22807539
I am creating another question related
0

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