IVssCreateWriterMetadata::AddDatabaseFiles method

The AddDatabaseFiles method indicates the file set (the specified file or files) that make up the database component to be backed up.


HRESULT AddDatabaseFiles(
  IN LPCWSTR wszLogicalPath,
  IN LPCWSTR wszDatabaseName,
  IN LPCWSTR wszPath,
  IN LPCWSTR wszFilespec,
  IN DWORD   dwBackupTypeMask



Pointer to a null-terminated wide character string containing the logical path of the component to which the database will be added.

For more information, see Logical Pathing of Components.

A logical path is not required and can be NULL.


Pointer to a null-terminated wide character string containing the name of the database.

This name is required and must match the name of the component to which the database is being added.


Pointer to a null-terminated wide character string containing the path of the directory containing the database file.

The path can contain environment variables (for example, %SystemRoot%) but cannot contain wildcard characters.

UNC paths are supported.

There is no requirement that the path end with a backslash (""). It is up to applications that retrieve this information to check.


Pointer to a null-terminated wide character string containing the file specification of the file or files associated with the database.

A file specification cannot contain directory specifications (for example, no backslashes) but can contain the ? and * wildcard characters.


A bit mask (or bitwise OR) of VSS_FILE_SPEC_BACKUP_TYPE enumeration values to indicate whether a writer should evaluate the file for participation in certain types of backup operations.

The default value for this argument is (VSS_FSBT_ALL_BACKUP_REQUIRED | VSS_FSBT_ALL_SNAPSHOT_REQUIRED).

Return Value

The following are the valid return codes for this method.

Value Meaning
The operation was successful.
One of the parameter values is not valid.
The caller is out of memory or other system resources.
The XML document is not valid. Check the event log for details. For more information, see Event and Error Handling Under VSS.
The specified component does not exist.
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.


Windows 7, Windows Server 2008 R2, Windows Vista, Windows Server 2008, Windows XP and Windows Server 2003:  Remote file shares are not supported until Windows 8 and Windows Server 2012. Writers support only local resources—sets of files whose absolute path starts with a valid local volume specification and cannot be a mapped network drive. Therefore, path inputs (wszPath) to AddDatabaseFiles (after the resolution of any environment variables) must be in this format.

This method can be called multiple times for a particular database. This is done when the database exists on files stored on separate volumes, as is possible with Microsoft SQL Server.

The values of the wszLogicalPath and wszDatabaseName parameters should match those of one of the database components previously added with the IVssCreateWriterMetadata::AddComponent method.


Minimum supported client Windows XP [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Target Platform Windows
Header vswriter.h (include Vss.h, VsWriter.h)
Library VssApi.lib

See Also