Solved

How to load and save listview content

Posted on 2010-09-13
6
440 Views
Last Modified: 2012-06-27
Hi,

I am using a working code to load and save the content of a listview.
Until Espasquier came with a more sufisticated code. That I want to
use but can read!

Can someone please help me to adjust the code of Espasquier
with the settings I use in my code:

procedure TMainForm.FormCreate(Sender: TObject);
begin
  if FileExists('Data1\Glucose.sav') then LoadListViewToFile(lstvGlucose, 'Data1\Glucose.sav');
  if FileExists('Data1\Bolus.sav') then LoadListViewToFile(lstvBolus, 'Data1\Bolus.sav');
  if FileExists('Data1\FoodDB.sav') then LoadListViewToFile(lstvFoodDB, 'Data1\FoodDB.sav');
  if FileExists('Data1\OwnDB.sav') then LoadListViewToFile(lstvOwnDB, 'Data1\OwnDB.sav');
end;

procedure TMainForm.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  SaveListViewToFile(lstvGlucose, 'Data1\Glucose.sav');
  SaveListViewToFile(lstvBolus, 'Data1\Bolus.sav');
  SaveListViewToFile(lstvFoodDB, 'Data1\FoodDB.sav');
  SaveListViewToFile(lstvOwnDB, 'Data1\OwnDB.sav');
end;

Thank you in advanced.

Peter



My code:



procedure TMainForm.FormCreate(Sender: TObject);

begin

  if FileExists('Data1\Glucose.sav') then LoadListViewToFile(lstvGlucose, 'Data1\Glucose.sav');

  if FileExists('Data1\Bolus.sav') then LoadListViewToFile(lstvBolus, 'Data1\Bolus.sav');

  if FileExists('Data1\FoodDB.sav') then LoadListViewToFile(lstvFoodDB, 'Data1\FoodDB.sav');

  if FileExists('Data1\OwnDB.sav') then LoadListViewToFile(lstvOwnDB, 'Data1\OwnDB.sav');

end;



procedure TMainForm.FormClose(Sender: TObject; var Action: TCloseAction);

begin

  SaveListViewToFile(lstvGlucose, 'Data1\Glucose.sav');

  SaveListViewToFile(lstvBolus, 'Data1\Bolus.sav');

  SaveListViewToFile(lstvFoodDB, 'Data1\FoodDB.sav');

  SaveListViewToFile(lstvOwnDB, 'Data1\OwnDB.sav');

end;



procedure TMainForm.LoadListViewToFile(AListView: TListView; sFileName: string);

var

  F: TFileStream;

  IdxItem, IdxSubItem, IdxImage: Integer;

  W, ItemCount, SubCount: Word;

  pText: PChar;

  PTemp: PChar;

  MySignature: array [0..2] of Char;

  sExeName: string;

begin

  with AListView do

  begin

    ItemCount := 0;

    SubCount  := 0;

    sExeName := ExtractFileName(sFileName);

    if not FileExists(sFileName) then

    begin

      MessageBox(Handle, PChar(Format(Msg1, [sExeName])), 'I/O Error', MB_ICONERROR);

      Exit;

    end;

    F := TFileStream.Create(sFileName, fmOpenRead);

    F.Read(MySignature, SizeOf(MySignature));

    if MySignature <> 'LVF' then

    begin

      MessageBox(Handle, PChar(Format(Msg2, [sExeName])), 'I/O Error', MB_ICONERROR);

      Exit;

    end;

    F.Read(ItemCount, SizeOf(ItemCount));

    Items.Clear;

    for idxItem := 1 to ItemCount do

    begin

      with Items.Add do

      begin

        F.Read(SubCount, SizeOf(SubCount));

        F.Read(IdxImage, SizeOf(IdxImage));

        ImageIndex := IdxImage;

        F.Read(w, SizeOf(w));

        pText := StrAlloc(w + 1);

        pTemp := StrAlloc(w + 1);

        F.Read(pTemp^, W);

        StrLCopy(pText, pTemp, W);

        Caption := StrPas(pText);

        StrDispose(pTemp);

        StrDispose(pText);

        if SubCount > 0 then

        begin

          for idxSubItem := 1 to SubCount do

          begin

            F.Read(w, SizeOf(w));

            pText := StrAlloc(w + 1);

            pTemp := StrAlloc(w + 1);

            F.Read(pTemp^, W);

            StrLCopy(pText, pTemp, W);

            Items[idxItem - 1].SubItems.Add(StrPas(pText));

            StrDispose(pTemp);

            StrDispose(pText);

          end;

        end;

      end;

    end;

    F.Free;

  end;

end;



procedure TMainForm.SaveListViewToFile(AListView: TListView; sFileName: string);

var

  idxItem, idxSub, IdxImage: Integer;

  F: TFileStream;

  pText: PChar;

  sText: string;

  W, ItemCount, SubCount: Word;

  MySignature: array [0..2] of Char;

begin

  with AListView do

  begin

    ItemCount := 0;

    SubCount  := 0;

    MySignature := 'LVF';

    F := TFileStream.Create(sFileName, fmCreate or fmOpenWrite);

    F.Write(MySignature, SizeOf(MySignature));

    if Items.Count = 0 then

      ItemCount := 0

    else

      ItemCount := Items.Count;

    F.Write(ItemCount, SizeOf(ItemCount));

    if Items.Count > 0 then

    begin

      for idxItem := 1 to ItemCount do

      begin

        with Items[idxItem - 1] do

        begin

          if SubItems.Count = 0 then

            SubCount := 0

          else

            SubCount := Subitems.Count;

          F.Write(SubCount, SizeOf(SubCount));

          IdxImage := ImageIndex;

          F.Write(IdxImage, SizeOf(IdxImage));

          sText := Caption;

          w     := Length(sText);

          pText := StrAlloc(Length(sText) + 1);

          StrPLCopy(pText, sText, Length(sText));

          F.Write(w, SizeOf(w));

          F.Write(pText^, w);

          StrDispose(pText);

          if SubCount > 0 then

          begin

            for idxSub := 0 to SubItems.Count - 1 do

            begin

              sText := SubItems[idxSub];

              w     := Length(sText);

              pText := StrAlloc(Length(sText) + 1);

              StrPLCopy(pText, sText, Length(sText));

              F.Write(w, SizeOf(w));

              F.Write(pText^, w);

              StrDispose(pText);

            end;

          end;

        end;

      end;

    end;

    F.Free;

  end;

end;



ESPASQUIER:



// GLOBAL STREAM UTILS : Load/Save Int/Strings



procedure StreamWriteInt(aStream:TStream;Val:Integer);

begin

 aStream.Write(Val,sizeof(Val)); 

end;



function  StreaReadInt(aStream:TStream):Integer;

begin

 aStream.Read(Result,sizeof(Result));

end; 



procedure StreamWriteString(aStream:TStream;aString:String);

Var

 L:Integer;

begin

 L:=Length(aString);

 StreamWriteInt(L);

 if L>0 Then aStream.Write(PChar(@aString[1])^,L*sizeof(Char));

end;

 

function StreamReadString(aStream:TStream):String;

Var

 L:Integer;

begin

 L:=StreaReadInt(aStream);

 SetLength(Result,L);

 if L>0 Then aStream.Read(PChar(@Result[1])^,L*sizeof(Char));

end;



//======== Load/Save ListView in stream ========



procedure StreamWriteListView(aStream:TStream;aListView:TListView);

Var

 i,j:integer;

begin

 StreamWriteInt(aStream,aListView.Items.Count);

 for i:=0 to aListView.Items.Count-1 do

  with aListView.Items[idxItem - 1] do

   begin

    StreamWriteString(aStream,Caption);

    StreamWriteInt(aStream,ImageIndex);

    StreamWriteInt(aStream,Subitems.Count);

    for j:=0 to Subitems.Count-1 do StreamWriteString(aStream,Subitems[j]);

   end;

end;



procedure StreamReadListView(aStream:TStream;aListView:TListView);

Var

 N,i,NS,j:integer;

begin

 aListView.Clear;

 N:=StreamReadInt(aStream);

 for i:=0 to N-1 do

  with aListView.Items.Add do

   begin

    Caption:=StreamReadString(aStream);

    ImageIndex:=StreamReadInt(aStream);

    NS:=StreamReadInt(aStream,Subitems.Count);

    for j:=0 to NS-1 do Subitems.Add(StreamReadString(aStream));

   end;

end;



//======== Load/Save ONE ListView in a file ========



procedure SaveListViewToFile(AListView: TListView; sFileName: string);

var

 F: TFileStream;

begin

 F := TFileStream.Create(sFileName, fmCreate or fmOpenWrite);

 try

  StreamWriteListView(F,AListView);

 finally

  F.Free;

 end;

end;



procedure LoadListViewToFile(AListView: TListView; sFileName: string);

var

 F: TFileStream;

begin

 F := TFileStream.Create(sFileName, fmOpenRead);

 try

  StreamReadListView(F,AListView);

 finally

  F.Free;

 end;

end;

Open in new window

0
Comment
Question by:peterkiers
  • 3
  • 2
6 Comments
 
LVL 9

Expert Comment

by:Mahdi78
ID: 33661627
Like this?

procedure SaveListViewToFile(AListView: TListView; sFileName: string);
var
 F: TFileStream;
begin
 F := TFileStream.Create(sFileName, fmCreate or fmOpenWrite);
 try
  StreamWriteListView(F,AListView);
 finally
  F.Free;
 end;
end;

procedure LoadListViewToFile(AListView: TListView; sFileName: string);
var
 F: TFileStream;
begin
 F := TFileStream.Create(sFileName, fmOpenRead);
 try
  StreamReadListView(F,AListView);
 finally
  F.Free;
 end;
end;

procedure TMainForm.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  SaveListViewToFile(lstvGlucose, 'Data1\Glucose.sav');
  SaveListViewToFile(lstvBolus, 'Data1\Bolus.sav');
  SaveListViewToFile(lstvFoodDB, 'Data1\FoodDB.sav');
  SaveListViewToFile(lstvOwnDB, 'Data1\OwnDB.sav');
end;

procedure TMainForm.FormCreate(Sender: TObject);
begin
  if FileExists('Data1\Glucose.sav') then LoadListViewToFile(lstvGlucose, 'Data1\Glucose.sav');
  if FileExists('Data1\Bolus.sav') then LoadListViewToFile(lstvBolus, 'Data1\Bolus.sav');
  if FileExists('Data1\FoodDB.sav') then LoadListViewToFile(lstvFoodDB, 'Data1\FoodDB.sav');
  if FileExists('Data1\OwnDB.sav') then LoadListViewToFile(lstvOwnDB, 'Data1\OwnDB.sav');
end;
0
 
LVL 9

Accepted Solution

by:
Mahdi78 earned 500 total points
ID: 33661886
ok, this is mine

procedure LoadListViewToFile(AListView: TListView; sFileName: string);
var
  F: TFileStream;
begin
  F := TFileStream.Create(sFileName, fmOpenRead or fmShareDenyWrite);
  try
    F.ReadComponent(AListView);
  finally
    F.Free;
  end;
end;

procedure SaveListViewToFile(AListView: TListView; sFileName: string);
var
  F: TFileStream;
begin
  F := TFileStream.Create(sFileName, fmCreate or fmShareCompat);
  try
    F.WriteComponent(AListView);
  finally
    F.Free;
  end;
end;

procedure TMainForm.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  SaveListViewToFile(lstvGlucose, 'Data1\Glucose.sav');
  SaveListViewToFile(lstvBolus, 'Data1\Bolus.sav');
  SaveListViewToFile(lstvFoodDB, 'Data1\FoodDB.sav');
  SaveListViewToFile(lstvOwnDB, 'Data1\OwnDB.sav');
end;

procedure TMainForm.FormCreate(Sender: TObject);
begin
  if FileExists('Data1\Glucose.sav') then LoadListViewToFile(lstvGlucose, 'Data1\Glucose.sav');
  if FileExists('Data1\Bolus.sav') then LoadListViewToFile(lstvBolus, 'Data1\Bolus.sav');
  if FileExists('Data1\FoodDB.sav') then LoadListViewToFile(lstvFoodDB, 'Data1\FoodDB.sav');
  if FileExists('Data1\OwnDB.sav') then LoadListViewToFile(lstvOwnDB, 'Data1\OwnDB.sav');
end;
0
 
LVL 1

Author Comment

by:peterkiers
ID: 33662167
It works great. Thanks.

Peter
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 25

Expert Comment

by:epasquier
ID: 33663334
I really don't understand what was your question / problem here ???
0
 
LVL 25

Expert Comment

by:epasquier
ID: 33663526
I tested my code, there were a few typos. I fixed all of them in the original question.
Read/Write Component works Ok without having to think much, but remember that it uses HUGE portions of code, so will be slower, will load/save everything not only data, including the ClassType of your listview

so it can be a problem if you want to change the look of your application, with different properties and/or another listview component
0
 
LVL 9

Expert Comment

by:Mahdi78
ID: 33664360
Question was based at epasquier code, i have posted my solution to enrich topic,
i think the good answer is when epasquier code been adjusted
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
Along with being a a promotional video for my three-day Annielytics Dashboard Seminor, this Micro Tutorial is an intro to Google Analytics API data.
Internet Business Fax to Email Made Easy - With  eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, f…

920 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now