BufDataset error?

BufDataset error? 4 years 3 weeks ago #17294

prekox maximus
Topic Author
Visitor

Hi!
Has the BufDataset unit changed since version 7.5?
7.6 etc. versions, it works in a different way, because it writes the contents of the BufDataset to the disk, but it cannot read it back! But it worked fine in version 7.5!

const
  BUFFERFAJLNEV = 'tempbufadatok.bds';
//.....
var
  Form1: TForm1;
  BufDataSet1: TBufDataset;
  szamlalo:integer;

procedure TForm1.FormCreate(Sender: TObject);
begin
  szamlalo:= 0;
  BufDataSet1 := TBufDataset.Create(nil);
  BufDataSet1.FileName:= BUFFERFAJLNEV;
  if FileExists(BUFFERFAJLNEV) = true then
  begin
    BufDataSet1.LoadFromFile(BUFFERFAJLNEV,dfBinary);
    BufDataSet1.IndexFieldNames:='ID';
    MemDataSource1.DataSet:= BufDataSet1;
    BufDataSet1.Last;
    szamlalo:= BufDataSet1.FieldByName('ID').AsInteger;
  end
  else
  begin
    BufDataSet1.FieldDefs.Add('ID', ftInteger,3);
    BufDataSet1.FieldDefs.Add('VRHCIK',ftString,13);
    BufDataSet1.FieldDefs.Add('MEGNEVEZES',ftString,50);
    BufDataSet1.FieldDefs.Add('VRHFME',ftstring,7);
    BufDataSet1.FieldDefs.Add('EGYSEGAR',ftString,7);
    BufDataSet1.FieldDefs.Add('TETELERTEK',ftString,5);
    BufDataSet1.IndexFieldNames:='ID';
    BufDataSet1.CreateDataset;
    MemDataSource1.DataSet:= BufDataSet1;
  end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  BufDataSet1.Free;
end;

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BufDataset error? 4 years 3 weeks ago #17295

Matis A. Away Moderator Posts: 1434 Thank you received: 230	Please, try and the latest CodeTyphon Ver 7.90 PilotLogic Core Programmer
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BufDataset error? 4 years 3 weeks ago #17297

prekox maximus Topic Author Visitor	I also tried with the latest version, the same thing happens...
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BufDataset error? 4 years 3 weeks ago #17300

Matis A. Away Moderator Posts: 1434 Thank you received: 230	Give us time to test and report PilotLogic Core Programmer
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BufDataset error? 4 years 2 weeks ago #17307

prekox maximus Topic Author Visitor	Any results?
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BufDataset error? 4 years 1 week ago #17308

prekox maximus Topic Author Visitor	the TBufDataset component works when I drop it on the form or the Datamodule, but when created from code it works differently and I don't know what the difference is...
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BufDataset error? 4 years 1 week ago #17309

prekox maximus Topic Author Visitor	Hi! I have attached an example code. Compiled on version 7.5, it works fine, compiled on version 7.9, it cannot open the saved file! File Attachment: File Name: BufDataset_error.zip File Size:231 KB File Attachment: File Name: BufDataset_error.zip File Size:231 KB Attachments:
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BufDataset error? 4 years 1 week ago #17310

prekox maximus Topic Author Visitor	An interesting thing is that it works fine in Lazarus 2.2.2, it works fine in CodeTyphon 7.5, it doesn't work until 7.6 - 7.9! ????
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BufDataset error? 4 years 1 week ago #17311

Matis A.
Away
Moderator
Posts: 1434
Thank you received: 230

Sorry for the delay
we have a "small" problem with Internet line in our LAB.

You must Always Define FieldDefs

  Form1: TForm1;
  BufDataSet1: TBufDataset;
implementation

{$R *.frm}

{ TForm1 }

procedure TForm1.FormCreate(Sender: TObject);
begin
  BufDataSet1 := TBufDataset.Create(nil);
  BufDataSet1.FileName:= BUFFERFFILENAME;

  BufDataSet1.FieldDefs.Add('ID', ftInteger,3);
  BufDataSet1.FieldDefs.Add('VRHCIK',ftString,13);
  BufDataSet1.FieldDefs.Add('MEGNEVEZES',ftString,50);
  BufDataSet1.FieldDefs.Add('VRHFME',ftstring,7);
  BufDataSet1.FieldDefs.Add('EGYSEGAR',ftString,7);
  BufDataSet1.FieldDefs.Add('TETELERTEK',ftString,5);
  BufDataSet1.IndexFieldNames:='ID';

  BufDataSet1.CreateDataset;
  MemDataSource1.DataSet:= BufDataSet1;

end;

We test the attach fixed project with
CT 7.9 and with LAB CodeTyphon 8.00
on Win11 ent

PilotLogic Core Programmer

BufDataset_fix.7z

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Last edit: by Matis A..

BufDataset error? 4 years 1 week ago #17314

prekox maximus
Topic Author
Visitor

This code doesn't work until 7.6 - 7.9..

procedure TForm1.FormCreate(Sender: TObject);
begin
  BufDataSet1 := TBufDataset.Create(nil);
  BufDataSet1.FileName:= BUFFERFFILENAME;
  if FileExists(BUFFERFFILENAME) = true then
  begin
    BufDataSet1.LoadFromFile(BUFFERFFILENAME,dfAny);  //indicates an error at this line
    BufDataSet1.IndexFieldNames:='ID';
    MemDataSource1.DataSet:= BufDataSet1;
  end
  else
  begin
    BufDataSet1.FieldDefs.Add('ID', ftInteger,3);
    BufDataSet1.FieldDefs.Add('VRHCIK',ftString,13);
    BufDataSet1.FieldDefs.Add('MEGNEVEZES',ftString,50);
    BufDataSet1.FieldDefs.Add('VRHFME',ftstring,7);
    BufDataSet1.FieldDefs.Add('EGYSEGAR',ftString,7);
    BufDataSet1.FieldDefs.Add('TETELERTEK',ftString,5);
    BufDataSet1.IndexFieldNames:='ID';
    BufDataSet1.CreateDataset;
    MemDataSource1.DataSet:= BufDataSet1;
  end;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
   BufDataSet1.Free;
end;

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BufDataset error? 4 years 1 week ago #17315

Matis A. Away Moderator Posts: 1434 Thank you received: 230	Yes it's FreePascal 3.3.1 C:\codetyphon\fpcsrc\packages\fcl-db\src\base\bufdataset.pas Changed from CT ver 7.60 The above propose modify/fix to your code, work OK. PilotLogic Core Programmer
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BufDataset error? 4 years 1 week ago #17316

prekox maximus Topic Author Visitor	I understand, but how do you read back the saved data from the file? With version 7.5 there was no problem reading back...
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BufDataset error? 4 years 1 week ago #17317

Matis A.
Away
Moderator
Posts: 1434
Thank you received: 230

Sorry
more tests....
This source work OK from me.

procedure TForm1.FormCreate(Sender: TObject);
begin
  BufDataSet1 := TBufDataset.Create(nil);

  if FileExists(BUFFERFFILENAME) = true then
  begin
    BufDataSet1.LoadFromFile(BUFFERFFILENAME);
    BufDataSet1.IndexFieldNames:='ID';
    MemDataSource1.DataSet:= BufDataSet1;
  end
  else
  begin
    BufDataSet1.FieldDefs.Add('ID', ftInteger,3);
    BufDataSet1.FieldDefs.Add('VRHCIK',ftString,13);
    BufDataSet1.FieldDefs.Add('MEGNEVEZES',ftString,50);
    BufDataSet1.FieldDefs.Add('VRHFME',ftstring,7);
    BufDataSet1.FieldDefs.Add('EGYSEGAR',ftString,7);
    BufDataSet1.FieldDefs.Add('TETELERTEK',ftString,5);
    BufDataSet1.IndexFieldNames:='ID';
    BufDataSet1.CreateDataset;
    MemDataSource1.DataSet:= BufDataSet1;
  end;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
   BufDataSet1.SaveToFile(BUFFERFFILENAME);
   BufDataSet1.Free;
end;

end.

PilotLogic Core Programmer

...ataset_fix2.7z

The following user(s) said Thank You: prekox maximus

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Last edit: by Matis A..

BufDataset error? 4 years 1 week ago #17318

prekox maximus Topic Author Visitor	It is interesting that the SaveToFile method was executed even when the TBufDataSet was released, but after version 7.6 it must be written out in the code... Thanks for the help, it works!
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BufDataset error? 4 years 1 week ago #17319

Matis A. Away Moderator Posts: 1434 Thank you received: 230	Always you can use the old file bufdataset.pas from CT 7.50 a) put the old C:\codetyphon\fpcsrc\packages\fcl-db\src\base\bufdataset.pas from CT 7.6 to your project folder b) Rename bufdataset.pas to mybufdataset.pas c) Use mybufdataset.pas file to you project. Have fun... PilotLogic Core Programmer The following user(s) said Thank You: prekox maximus
	Please Log in or Create an account to join the conversation. Last edit: by Matis A..

TOPIC:

BufDataset error? 4 years 3 weeks ago #17294

BufDataset error? 4 years 3 weeks ago #17295

BufDataset error? 4 years 3 weeks ago #17297

BufDataset error? 4 years 3 weeks ago #17300

BufDataset error? 4 years 2 weeks ago #17307

BufDataset error? 4 years 1 week ago #17308

BufDataset error? 4 years 1 week ago #17309

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BufDataset error? 4 years 1 week ago #17310

BufDataset error? 4 years 1 week ago #17311

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BufDataset error? 4 years 1 week ago #17314

BufDataset error? 4 years 1 week ago #17315

BufDataset error? 4 years 1 week ago #17316

BufDataset error? 4 years 1 week ago #17317

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BufDataset error? 4 years 1 week ago #17318

BufDataset error? 4 years 1 week ago #17319