Sending LOB to procedure

Question

Is there any possibility how to send BLOB parameter to PL/SQL procedure from OCI
The following PL/SQL code is working
connect test_user1/test_user1;
drop table test_tab;
create table test_tab (f1 integer, f2 blob);
create or replace procedure test_blob(p_blob in blob) as
begin
     insert into test_tab (f1, f2) values (1, p_blob);
end;
grant execute on test_blob to test_user2;
connect test_user2/test_user2;
declare
     t_blob blob;
     buffer raw(20000) := '';
begin
     for i in 1..1000 loop
          buffer := buffer || hextoraw(i mod 256);
     end loop;
     dbms_lob.createtemporary(t_blob,true);
     dbms_lob.open(t_blob, dbms_lob.lob_readwrite);
     dbms_lob.Writeappend(t_blob, 1000, buffer);
     dbms_lob.Close(t_blob);
     pdm.test_blob(t_blob);
end;
Operations made by user2 I would like to execute from within the C/C++ code (using OCI)
But when I execute this code fragment:
connection.CreateTemporaryBlob(tblob);
connection.OpenLob(tblob);
connection.WriteToLob(tblob, buffer, 8000);
connection.CloseLob(tblob);
const char *insert_sql = "begin user1.test_tab_ins(:1); end;";
if (connection.PrepareStatement(stmthp, insert_sql))
if (connection.BindInputVariable(stmthp, &blob_desc, 1, tblob, 0, SQLT_BLOB))
connection.ExecuteStatement(stmthp);
connection.FreeHandle(stmthp, OCI_HTYPE_STMT);
program crash in the ExecuteStatement

Answer 1

I have found the best way to provide data for a LOB operation is to bind the data as SQLT_LNG and let the OCI take care of the translation for you.
HTH,
Ken