JetCloseFileInstance Function

Article
08/26/2021

Applies to: Windows | Windows Server

JetCloseFileInstance Function

The JetCloseFileInstance function closes a file that was opened with JetOpenFileInstance after the data from that file has been extracted using JetReadFileInstance.

Windows XP: JetCloseFileInstance is introduced in Windows XP.

    JET_ERR JET_API JetCloseFileInstance(
      __in          JET_INSTANCE instance,
      __in          JET_HANDLE hfFile
    );

Parameters

instance

The instance to use for this call.

For Windows 2000, the API variant that accepts this parameter is not available because only one instance is supported. The use of this one global instance is implied in this case.

For Windows XP and later releases, the API variant that does not accept this parameter may only be called when the engine is in legacy mode (Windows 2000 compatibility mode) where only one instance is supported. Otherwise, the operation will fail with JET_errRunningInMultiInstanceMode.

hfFile

The handle of the file to be read.

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_errClientRequestToStopJetService	It is not possible to complete the operation because all activity on the instance associated with the session has ceased as a result of a call to JetStopServiceInstance.
JET_errInstanceUnavailable	It is not possible to complete the operation because the instance associated with the session has encountered a fatal error that requires that access to all data be revoked to protect the integrity of that data. This error will only be returned by Windows XP and later releases.
JET_errInvalidParameter	One of the parameters that was provided contained an unexpected value, or the combination of several parameter values yielded an unexpected result. This can happen for JetCloseFileInstance when: The specified instance handle is invalid (Windows XP and later releases) The specified file handle is invalid
JET_errNoBackup	The operation failed because no external backup is in progress.
JET_errNotInitialized	It is not possible to complete the operation because the instance associated with the session has not been initialized yet.
JET_errRestoreInProgress	It is not possible to complete the operation because a restore operation is in progress on the instance associated with the session.
JET_errRunningInMultiInstanceMode	The operation failed because an attempt was made to use the engine in legacy mode (Windows 2000 compatibility mode) where only one instance is supported when in fact multiple instances already exist.
JET_errTermInProgress	It is not possible to complete the operation because the instance associated with the session is being shut down.

On success, the file handle is closed. If a database file was closed then the associated database patch file (if any) is destroyed.

On failure, no change occurs.

Remarks

The database engine currently only supports one open file through JetOpenFileInstance at a time. If a file handle is opened using JetOpenFileInstance then it must be closed using JetCloseFileInstance before another file can be opened.

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.

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JetCloseFileInstance Function