BLOB_ENTRY_LENGTH

Used with BEGIN_COLUMN_MAP and END_COLUMN_MAP to bind a binary large object (BLOB). Similar to BLOB_ENTRY, except that this macro also gets the length in bytes of the BLOB column.

BLOB_ENTRY_LENGTH(nOrdinal, IID, flags, data, length )

Paramètres

• nOrdinal
  [in] The column number.

• IID
  [in] Interface GUID, such as IDD_ISequentialStream, used to retrieve the BLOB.

• flags
  [in] Storage-mode flags as defined by the OLE Structured Storage model (for example, STGM_READ).

• data
  [in] The corresponding data member in the user record.

• length
  [out] The (actual) length in bytes of the BLOB column.

Exemple

See How Can I Retrieve a BLOB?.

Configuration requise

En-tête : atldbcli.h

Voir aussi

Référence

BEGIN_COLUMN_MAP

END_COLUMN_MAP

COLUMN_ENTRY

BLOB_ENTRY

BLOB_ENTRY_LENGTH_STATUS

BLOB_ENTRY_STATUS

Autres ressources

Macros et fonctions globales pour les modèles du consommateur OLE DB