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JetGetInstanceInfo Function

Applies to: Windows | Windows Server

JetGetInstanceInfo Function

The JetGetInstanceInfo function retrieves information about the instances that are running.

Windows XP:  JetGetInstanceInfo is introduced in Windows XP.

    JET_ERR JET_API JetGetInstanceInfo(
      __out         unsigned long* pcInstanceInfo,
      __out         JET_INSTANCE_INFO** paInstanceInfo
    );

Parameters

pcInstanceInfo

A pointer to a buffer which will receive the number of elements stored in paInstanceInfo.

paInstanceInfo

A pointer to a buffer which will receive the address of the first element of an array of structures.

Return Value

This function returns the JET_ERR datatype with one of the following return codes. For more information about the possible ESE errors, see Extensible Storage Engine Errors and Error Handling Parameters.

Return code

Description

JET_errSuccess

The operation completed successfully.

JET_errInvalidParameter

One of the parameters provided contained an unexpected value or contained a value that did not make sense when combined with the value of another parameter. This error will be returned by JetGetInstanceInfo when:

  • pcInstanceInfo or paInstanceInfo are NULL.

JET_errOutOfMemory

There is insufficient memory to process the request.

Remarks

The database engine will allocate an array of JET_INSTANCE_INFO structures. The caller is responsible for freeing this memory with JetFreeBuffer.

If there are no active instances, JetGetInstanceInfo will return JET_errSuccess, and pcInstanceInfo will receive a value of 0.

Requirements

Requirement Value

Client

Requires Windows Vista or Windows XP.

Server

Requires Windows Server 2008 or Windows Server 2003.

Header

Declared in Esent.h.

Library

Use ESENT.lib.

DLL

Requires ESENT.dll.

Unicode

Implemented as JetGetInstanceInfoW (Unicode) and JetGetInstanceInfoA (ANSI).

See Also

JET_ERR
JET_INSTANCE
JET_INSTANCE_INFO
JetFreeBuffer