LocalDBGetInstances Function
Applies to: 
SQL Server
Returns all SQL Server Express LocalDB instances with the given version.
Header file: msoledbsql.h
Syntax
#define MAX_LOCALDB_INSTANCE_NAME_LENGTH 128typedef WCHAR TLocalDBInstanceName[MAX_LOCALDB_INSTANCE_NAME_LENGTH + 1];typedef TLocalDBInstanceName* PTLocalDBInstanceName;
HRESULT LocalDBGetInstances(
PTLocalDBInstanceName pInstanceNames,
LPDWORD lpdwNumberOfInstances
);
Parameters
pInstanceNames
[Output] When this function returns, contains the names of both named and default LocalDB instances on the user's workstation.
lpdwNumberOfInstances
[Input/Output] On input, contains the number of slots for instance names in the pInstanceNames buffer. On output, contains the number of LocalDB instances found on the user's workstation.
Returns
S_OK
The function succeeded.
LOCALDB_ERROR_NOT_INSTALLED
SQL Server Express LocalDB is not installed on the computer.
LOCALDB_ERROR_INVALID_PARAMETER
One or more specified input parameters are invalid.
LOCALDB_ERROR_INSUFFICIENT_BUFFER
The input buffer is too short, and truncation was not requested.
LOCALDB_ERROR_INSTANCE_FOLDER_PATH_TOO_LONG
The path where the instance should be stored is longer than MAX_PATH.
LOCALDB_ERROR_CANNOT_ACCESS_INSTANCE_REGISTRY
An instance registry cannot be accessed.
LOCALDB_ERROR_INSTANCE_CONFIGURATION_CORRUPT
An instance configuration is corrupted.
LOCALDB_ERROR_INTERNAL_ERROR
An unexpected error occurred. See the event log for details.
Remarks
For a code sample that uses LocalDB API, see SQL Server Express LocalDB Reference.