Hi all,

I have a TIB_Query with SQL
select * from rdb$database

Then I declared a calculated field like this:
blob_calc blob sub_type 0

procedure TForm1.IB_Query1CalculateField(Sender: TIB_Statement; ARow: TIB_Row;
AField: TIB_Column);
begin
if SameText(AField.FieldName, 'blob_calc') then
AField.Assign(TStringStream.Create('abc')); // <- AV here
end;

When I open the query I get an AV in ClearBlobNodeData.

Callstack follows:

IB_Session.pas | | ClearBlobNodeData
IB_Session.pas | | ClearBlobNodeData
IB_Components.pas | TIB_BlobStream | Initialize
IB_Components.pas | TIB_BlobStream | Initialize
IB_Components.pas | TIB_BlobStream | Create
IB_Components.pas | TIB_BlobStream | CreateForColumn
IB_Components.pas | TIB_BlobStream | CreateForColumn
IB_Components.pas | TIB_Statement | CreateBlobStream
IB_Components.pas | TIB_Statement | CreateBlobStream
IB_Components.pas | TIB_ColumnBlob | LoadFromStream
IB_Components.pas | TIB_ColumnBlob | LoadFromStream
IB_Components.pas | TIB_ColumnBlob | Assign
Unit1.pas | TForm1 | IB_Query1CalculateField

Using IBO 4.8.7 and D2007.

Question is: Is this a known limitation or am I doing something wrong here?

I'm using the calculated blob because I select compressed bitmap
images from the database and need to present them to ReportBuilder as
blobs containing uncompressed images.

TIA,
Markus