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Saving and Restoring DevEx view information via streams

Posted on 2009-04-07
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Last Modified: 2013-11-23
I have two procedures, one of which is intended to write grid view information to a database field and the other is to read and use this information to restore the view.  Code is below.  I thought the procs were working with early testing but now I am wondering if that was a hallucination!?  I'm hoping someone can spot my problem.
 - I created similar procs where the information is stored to and restored from the registry and those work as expected
 - I can see the data being written and re-written to the database.
 - I have stepped through the program to verify that each of the commands are executing.
procedure TfrmMain.SaveShopGridsToDB;

var

  Stream: TMemoryStream;

  BS: TAdsBlobStream;

begin

  Stream := TMemoryStream.Create;

  try

    gtvShop.StoreToStream(Stream, [], '');

    dtm.tblCases.Edit;

    BS := TAdsBlobStream(dtm.tblCases.CreateBlobStream(

                       dtm.tblCases.FieldByName('CsShopGrid1'), bmWrite));

    try

      BS.CopyFrom(Stream, 0);

    finally

      BS.Free;

      dtm.tblCases.Post;

    end;

  finally

    Stream.Free;

  end;

end;
 

procedure TfrmMain.RestoreShopGridsFromDB;

var

  Stream: TMemoryStream;

  BS: TAdsBlobStream;

begin

  if dtm.tblCases.FieldByName('CsShopGrid1').IsNull then Exit;

  Stream := TMemoryStream.Create;

  try

    BS := TAdsBlobStream(dtm.tblCases.CreateBlobStream(

                       dtm.tblCases.FieldByName('CsShopGrid1'), bmRead)); 

    try

      Stream.CopyFrom(BS, 0);

      gtvShop.RestoreFromStream(Stream, True, False, [], '');

    finally

      BS.Free;

    end;

  finally

   Stream.Free;

  end;

end;

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Question by:ttheimer
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3 Comments
 
LVL 5

Expert Comment

by:Mechanic_Kharkov
ID: 24093363
Maybe and of stream?

      Stream.CopyFrom(BS, 0);

      Stream.Position := 0;

      gtvShop.RestoreFromStream(Stream, True, False, [], '');

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Accepted Solution

by:
Mechanic_Kharkov earned 500 total points
ID: 24093367
*end of stream :-)
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Author Closing Comment

by:ttheimer
ID: 31567829
Spot on!  I added the line to reset the stream position and the save and restore worked as intended.  Thank you.
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