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BufDataset error? 1 year 9 months ago #17294

  • prekox maximus
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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? 1 year 9 months ago #17295

  • Matis A.
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Please, try and the latest CodeTyphon Ver 7.90 
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BufDataset error? 1 year 9 months ago #17297

  • prekox maximus
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I also tried with the latest version, the same thing happens...

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BufDataset error? 1 year 9 months ago #17300

  • Matis A.
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Give us time to test and report
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BufDataset error? 1 year 9 months ago #17307

  • prekox maximus
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Any results?

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BufDataset error? 1 year 8 months ago #17308

  • prekox maximus
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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? 1 year 8 months ago #17309

  • prekox maximus
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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? 1 year 8 months ago #17310

  • prekox maximus
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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? 1 year 8 months ago #17311

  • Matis A.
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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
 
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Last edit: by Matis A..

BufDataset error? 1 year 8 months ago #17314

  • prekox maximus
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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? 1 year 8 months ago #17315

  • Matis A.
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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.
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Last edit: by Matis A..

BufDataset error? 1 year 8 months ago #17316

  • prekox maximus
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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? 1 year 8 months ago #17317

  • Matis A.
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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.


 
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Last edit: by Matis A..

BufDataset error? 1 year 8 months ago #17318

  • prekox maximus
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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? 1 year 8 months ago #17319

  • Matis A.
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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...
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Last edit: by Matis A..
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