[Solved] Different behaviour of Blob type

[luca]

Hi,
I've updated a program to last official version of Lazarus.
I must change this code

Code: Pascal  [Select][+][-]

1. var
2.   i:integer;
3.   a:String;  
4. begin
5. ....
6.   qry.ParamByName('VAL').AsBlob:=a;
7. ....
8. end;
9.  

to this one

Code: Pascal  [Select][+][-]

1. var
2.   i:integer;
3.   a:TBytes;  
4. begin
5. ....
6.   qry.ParamByName('VAL').AsBlob:=a;
7. ....
8. end;
9.  

I know probably last version is better than the previous one, BUT I cannot compile the old code because I receive this error:

unit1.pas(470,43) Error: Incompatible type for arg no. 1: Got "AnsiString", expected "TBytes"

So my question is: what has changed from Lazarus 2.0.12 to Lazarus 2.2.0?

Regards
Luca

[luca]

I found this in the user Changes 3.2.0
https://wiki.freepascal.org/User_Changes_3.2.0#TBlobData_opaque_type_reworked_to_TBytes

TBlobData opaque type reworked to TBytes
Old behaviour: TBlobData was declared as Ansistring
New behaviour: TBlobData is declared as TBytes
Reason for change: Delphi compatibility. Also helps to avoid possible code page recodings.
Remedy: If your application used TBlobData as a string, you can use AsString for parameters, or convert to TBytes.