Author: Tomas Rutkauskas

How to store TForms and / or their properties in a Paradox blob field

Answer:
1   
2   procedure SaveToField(FField: TBlobField; Form: TComponent);
3   var
4     Stream: TBlobStream;
5     FormName: string;
6   begin
7     FormName := Copy(Form.ClassName, 2, 99);
8     Stream := TBlobStream.Create(FField, bmWrite);
9     try
10      Stream.WriteComponentRes(FormName, Form);
11    finally
12      Stream.Free;
13    end;
14  end;
15  
16  procedure LoadFromField(FField: TBlobField; Form: TComponent);
17  var
18    Stream: TBlobStream;
19    I: integer;
20  begin
21    try
22      Stream := TBlobStream.Create(FField, bmRead);
23      try
24        {delete all components}
25        for I := Form.ComponentCount - 1 downto 0 do
26          Form.Components[I].Free;
27        Stream.ReadComponentRes(Form);
28      finally
29        Stream.Free;
30      end;
31    except
32      on EFOpenError do {nothing}
33        ;
34    end;
35  end;