LDAPModA structure (winldap.h)

Article
07/27/2022

The LDAPMod structure holds data required to perform a modification operation.

Syntax

typedef struct ldapmodA {
  ULONG mod_op;
  PCHAR mod_type;
  union {
    PCHAR  *modv_strvals;
    berval **modv_bvals;
  } mod_vals;
} LDAPModA, *PLDAPModA;

Members

mod_op

Specifies one of the following values to indicate the modification operation to perform.

You can use the bitwise OR operator to combine the operation value with LDAP_MOD_BVALUES to indicate that the mod_vals union uses the modv_bvals member. If LDAP_MOD_BVALUES is not set, the union uses the modv_strvals member.

LDAP_MOD_ADD (0x00)

Adds a value to the entry. The supplied values are appended to the existing values in the attribute.

LDAP_MOD_DELETE (0x01)

Deletes a value in the entry. The supplied values are deleted from the current attribute values.

LDAP_MOD_REPLACE (0x02)

Replaces a value in the entry. The supplied values replace the existing attribute values.

mod_type

Pointer to a null-terminated string that specifies the name of the attribute to modify.

mod_vals

Pointer to an array of values, if any, to add, delete, or replace. If mop_op does not include the LDAP_MOD_BVALUES flag, the modv_strvals member is a pointer to an array of null-terminated strings. If mop_op includes LDAP_MOD_BVALUES, the modv_bvals member is a pointer to an array of berval pointers, which is useful for specifying binary values.

mod_vals.modv_strvals

Pointer to a null-terminated array of null-terminated strings. The last element of the array must be a NULL pointer.

mod_vals.modv_bvals

Pointer to a NULL-terminated array of berval pointers. The last element of the array must be a NULL pointer.

Remarks

Assign values to the fields of the LDAPMod structure before you call a modification function ( ldap_add*, or ldap_modify*).

ldap_modify* with the LDAP_MOD_REPLACE operation does not delete an attribute when passed a null pointer. However, LDAP_MOD_DELETE deletes the entire attribute when mod_vals is set to NULL.

When passing a LDAPMod structure into the ldap_add* functions, only the LDAP_MOD_BVALUES flag is significant. Creating a new object implies adding values to it.

Note

The winldap.h header defines LDAPMod as an alias that automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that is not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.

Requirements

Requirement	Value
Minimum supported client	Windows Vista
Minimum supported server	Windows Server 2008
Header	winldap.h

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