EWF API Functions (Standard 8)

7/8/2014

Review the functions provided by the EWF API in Windows Embedded 8 Standard (Standard 8).

This section describes the Enhanced Write Filter (EWF) functions that you use to create, configure, and protect EWF volumes.

In This Section

The following table shows the functions that are used to query and configure protected Enhanced Write Filter volumes.

Function	Description
EwfMgrCheckpoint	Adds a checkpoint overlay level on the specified EWF-protected volume.
EwfMgrClearCommand	Clears any pending commands that would have occurred on the next restart.
EwfMgrClose	Closes an EWF-protected volume.
EwfMgrCommit	Commits all current level data in the overlay to the EWF-protected volume.
EwfMgrCommitAndDisableLive	Commits all current level data immediately to the EWF-protected volume and then disables EWF.
EwfMgrCommitFile	Commits a single file, whose size or location much not have changed, to the protected volume.
EwfMgrDisable	Disables a currently enabled overlay on the specified EWF-protected volume.
EwfMgrEnable	Enables a currently disabled overlay on the specified EWF-protected volume.
EwfMgrGetDriveLetterFromVolumeName	Retrieves the drive letter for the specified volume name.
EwfMgrGetPersistentData	Retrieves the persistent data for an EWF-protected volume.
EwfMgrGetProtectedVolumeConfig	Retrieves the configuration information for an EWF-protected volume.
EwfMgrOpenProtected	Opens an EWF-protected volume.
EwfMgrRestore	Restores one overlay level on the specified EWF-protected volume, discarding all changes in the current level.
EwfMgrSetLevel	Sets the overlay level on an EWF-protected volume.
EwfMgrSetPersistentData	Sets the persistent data for an EWF-protected volume.

The following table shows the functions that are used to query and configure the EWF overlay store volumes.

Function	Description
EwfMgrGetOverlayStoreConfig	Retrieves the configuration information for the EWF overlay store.
EwfMgrOpenOverlayStore	Retrieves the name of the overlay store volume, if it exists.
EwfMgrRegisterLowSpaceNotification	Registers for a low space notification when the available bytes in the overlay reach a specified threshold.

The following table shows the functions that are used to obtain and work with a list of EWF-protected volumes.

Function	Description
EwfMgrGetProtectedVolumeList	Retrieves a list of all the EWF-protected volumes.
EwfMgrVolumeNameEntryPop	Removes the current entry from the EWF volume name list and frees the current memory entry.
EwfMgrVolumeNameListDelete	Deletes all entries in the EWF volume name list.
EwfMgrVolumeNameListIsEmpty	Determines whether the EWF volume name list is empty.

The following table shows the EWF API functions that are deprecated in Windows Embedded 8 Standard (Standard 8).

Function	Description
EwfMgrActivateHORM	Deprecated. This function enables Hibernate Once/Resume Many (HORM) support at run time.
EwfMgrDeactivateHORM	Deprecated. This function disables HORM support.
EwfMgrIsHORMActivated	Deprecated. This function returns the current status of HORM.

Deprecated.

This function enables Hibernate Once/Resume Many (HORM) support at run time.

Deprecated.

This function disables HORM support.

Deprecated.

This function returns the current status of HORM.