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IsVolumeSnapshotted function

The IsVolumeSnapshotted function determines whether any shadow copies exist for the specified volume.

Note This function is exported as IsVolumeSnapshottedInternal, but you should call IsVolumeSnapshotted, not IsVolumeSnapshottedInternal.

Syntax

C++


HRESULT IsVolumeSnapshotted(
  _In_   VSS_PWSZ pwszVolumeName,
  _Out_  BOOL *pbSnapshotsPresent,
  _Out_  LONG *plSnapshotCapability
);

Parameters

pwszVolumeName [in]

Name of the volume. The name of the volume to be checked must be in one of the following formats and must include a trailing backslash (\):

The path of a mounted folder, for example, Y:\MountX\
A drive letter, for example, D:\
A volume GUID path of the form \\?\Volume{GUID}\ (where GUID identifies the volume)

pbSnapshotsPresent [out]

The value of this parameter is TRUE if the volume has a shadow copy, and FALSE if the volume does not have a shadow copy.

plSnapshotCapability [out]

A bit mask (or bitwise OR) of VSS_SNAPSHOT_COMPATIBILITY values that indicates whether certain volume control or file I/O operations are disabled for the given volume if a shadow copy of it exists.

Return value

The return values listed here are in addition to the normal COM HRESULTs that may be returned at any time from the function.

Value	Meaning
S_OK	The function completed successfully.
E_ACCESSDENIED	The caller does not have sufficient backup privileges or is not an administrator.
E_INVALIDARG	One of the parameters is not valid.
E_OUTOFMEMORY	Out of memory or other system resources.
VSS_E_PROVIDER_VETO	Expected provider error. The provider logged the error in the event log. For more information, see Event and Error Handling Under VSS.
VSS_E_OBJECT_NOT_FOUND	The specified volume was not found.
VSS_E_UNEXPECTED	Unexpected error. The error code is logged in the error log file. For more information, see Event and Error Handling Under VSS. Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP: This value is not supported until Windows Server 2008 R2 and Windows 7. E_UNEXPECTED is used instead.
VSS_E_UNEXPECTED_PROVIDER_ERROR	Unexpected provider error. The error code is logged in the event log file. For additional information, see Event and Error Handling Under VSS.

Remarks

Before calling this function, the caller must have initialized COM by calling the CoInitialize function.

If no volume control or file I/O operations are disabled for the selected volume, then the shadow copy capability of the selected volume returned by plSnapshotCapability will be zero.

Requirements

Minimum supported client	Windows XP [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Header	VsBackup.h (include VsBackup.h, Vss.h, or VsWriter.h)
Library	VssApi.lib
DLL	VssApi.dll

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