EWF API Functions
The following table describes the EWF creation and configuration function.
| Function | Description |
|---|---|
| ConfigureEwf | This function creates and configures the EWF volume on the device. |
The following table shows the functions that are used to query and configure protected Enhanced Write Filter (EWF) volumes.
| Function | Description |
|---|---|
| EwfMgrGetDriveLetterFromVolumeName | This function gets the drive letter for the specified volume name. |
| EwfMgrOpenProtected | This function opens an EWF-protected volume. |
| EwfMgrClose | This function closes an EWF-protected volume. |
| EwfMgrClearCommand | This function clears any pending commands that would have occurred on the next restart. |
| EwfMgrSetPersistentData | This function sets the persistent data for an EWF-protected volume. |
| EwfMgrGetPersistentData | This function gets the persistent data for an EWF-protected volume. |
| EwfMgrCheckpoint | This function adds a checkpoint overlay level on the specified EWF-protected volume. |
| EwfMgrRestore | This function restores one overlay level on the specified EWF-protected volume, discarding all changes in the current level. |
| EwfMgrDisable | This function disables a currently enabled overlay on the specified EWF-protected volume. |
| EwfMgrEnable | This function enables a currently disabled overlay on the specified EWF-protected volume. |
| EwfMgrCommit | This function commits all current level data in the overlay to the EWF-protected volume. |
| EwfMgrCommitFile | This function commits a single file to the protected volume. The size of the file or its location must not have changed before the file is committed. |
| EwfMgrCommitAndDisableLive | This function immediately commits all current level data to the EWF-protected volume and then disabled EWF. This function does not require a reboot. |
| EwfMgrSetLevel | This function sets the overlay level on an EWF-protected volume. |
| EwfMgrGetProtectedVolumeConfig | This function gets the configuration information 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 |
|---|---|
| EwfMgrOpenOverlayStore | This function gets the name of the overlay store volume, if it exists. |
| EwfMgrGetOverlayStoreConfig | This function gets the configuration information for the EWF overlay store. |
| EwfMgrRegisterLowSpaceNotification | This function 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 | This function gets a list of all the EWF-protected volumes. |
| EwfMgrVolumeNameListIsEmpty | This function determines if the EWF volume name list is empty. |
| EwfMgrVolumeNameEntryPop | This function removes the current entry from the EWF volume name list and frees the current memory entry. |
| EwfMgrVolumeNameListDelete | This function deletes all entries in the EWF volume name list. |
The following table shows the functions that are used to manage Hibernate Once Resume Many (HORM).
| Function | Description |
|---|---|
| EwfMgrActivateHorm | Enables HORM support at run-time |
| EwfMgrDeactivateHorm | Disables HORM support |
| EwfMgrIsHormActivated | Returns the current status of HORM |
See Also
Enhanced Write Filter API | EWF API Code Sample
Last updated on Wednesday, October 18, 2006
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