Need help with OCILobWrite

Hello together,

I have a problem, using the OCILobWrite function to copy a byte-stream into a BLOB.
If I try to write a BLOB of 300 Bytes, this could normally done in one piece, but all time the OCILobWrite funtion returns with Error-code 1.

Any Idea?

blob is a properly allocated handle, buffer contains the data of "bytes" bytes.
All handles are also properly initialized. For example a Fetch of a Blob, using OCILobRead works without problems.

Thanx in advance

--
MfG / Best Regards

Frank an der Heiden

ESA - Energotec Systeme und Automation GmbH
Grafenberger Allee 130 a
40237 Düsseldorf
Tel.: +49 (0)211 91440-19
email: fh_at_energotec.de
"I came, saw and installed everything new"

Here is the code:
************************
void write_blob(OCILobLocator *blob, const void *buffer, int bytes)
{
  ub4   offset = 1;
  ub4   loblen = 0;
  ub1   bufp[32000];
  ub4   amtp = bytes;
  ub1   piece;
  sword retval;
  ub4   bytes2write;
  ub4   remainder = bytes;

  printf("--> To do streamed write lob, amount = %d\n", bytes);

  OCILobGetLength(oschp, errhp, blob, &loblen);

  printf("Before stream write, LOB length = %lu\n\n", loblen);

  if (bytes > 32000)
    bytes2write = 32000;
  else
    bytes2write = bytes;

  memmove(bufp,buffer,bytes2write);

  remainder = remainder - bytes2write;

  if (remainder == 0)       /* exactly one piece in the file */


  {

    if (retval = OCILobWrite(oschp, errhp, blob, &amtp, offset, (dvoid
*)bufp,
                            (ub4)bytes2write, OCI_ONE_PIECE, (dvoid *)0,
                            (sb4 (*)(dvoid *, dvoid *, ub4 *, ub1 *)) 0,
                            (ub2) 0, (ub1) SQLCS_IMPLICIT) != OCI_SUCCESS)
    {

      printf("ERROR: OCILobWrite(), retval = %d\n", retval);
      return;
    }
  }
  else                     /* more than one piece */


  {

    if (OCILobWrite(oschp, errhp, blob, &amtp, offset, (dvoid *) bufp,
                    (ub4) 32000, OCI_FIRST_PIECE, (dvoid *)0,
                    (sb4 (*)(dvoid *, dvoid *, ub4 *, ub1 *)) 0,
                    (ub2) 0, (ub1) SQLCS_IMPLICIT) != OCI_NEED_DATA)
    {
      printf("ERROR: OCILobWrite().\n");
      return;
    }

    piece = OCI_NEXT_PIECE;

    do
    {
      if (remainder > 32000)
        bytes2write = 32000;
      else
      {
        bytes2write = remainder;
        piece = OCI_LAST_PIECE;
      }

      memmove(bufp,buffer+(bytes-remainder),bytes2write);

      retval = OCILobWrite(oschp, errhp, blob, &amtp, offset, (dvoid *)
bufp,
                          (ub4) bytes2write, piece, (dvoid *)0,
                          (sb4 (*)(dvoid *, dvoid *, ub4 *, ub1 *)) 0,
                          (ub2) 0, (ub1) SQLCS_IMPLICIT);

      remainder = remainder - bytes2write;

    } while (retval == OCI_NEED_DATA && remainder>0);
  }

  if (retval != OCI_SUCCESS)


  {

    printf("Error: stream writing LOB.\n");
    return;
  }

  OCILobGetLength(oschp, errhp, blob, &loblen);
  printf("After stream write, LOB length = %lu\n\n", loblen);

  return;
}