MountNtmsMedia function (ntmsapi.h)

[Removable Storage Manager is no longer available as of Windows 7 and Windows Server 2008 R2.]

The MountNtmsMedia function synchronously mounts one or more pieces of media.

Syntax

DWORD MountNtmsMedia(
  [in]      HANDLE                   hSession,
  [in]      LPNTMS_GUID              lpMediaId,
  [in, out] LPNTMS_GUID              lpDriveId,
  [in]      DWORD                    dwCount,
  [in]      DWORD                    dwOptions,
  [in]      int                      dwPriority,
  [in]      DWORD                    dwTimeout,
            LPNTMS_MOUNT_INFORMATION lpMountInformation
);

Parameters

[in] hSession

Handle to the session returned by the OpenNtmsSession function.

[in] lpMediaId

Array of unique identifiers of logical media or sides.

[in, out] lpDriveId

Array of drive identifiers that corresponds to the list of media in the lpMediaId parameter. This array either specifies a list of drives to mount media into or receives the list of drives that media is mounted into on operation completion. See the NTMS_MOUNT_SPECIFIC_DRIVE value below. If the MountNtmsMedia function times out prior to the completion of the mount, RSM does not return the list of drives.

[in] dwCount

Number of media identifiers and drive identifiers passed in the lpMediaId and lpDriveId parameters. Note that lpMediaId and lpDriveId must point to the first element of equal-length arrays.

[in] dwOptions

Options. This parameter can be one or more of the following values.

[in] dwPriority

Priority of the mount used by RSM to allow access to drives. Priorities range from -15 to 15, with 15 the highest priority and 0 is the default. This parameter can also take one of the following constants. An application should pass NTMS_PRIORITY_NORMAL unless a special mount priority is required.

[in] dwTimeout

Maximum time allowed to mount the specified media, in milliseconds. Set this parameter to INFINITE to wait until the mount is completed.

lpMountInformation

This parameter is reserved and should be NULL.

Return value

This function returns one of the following values.

Remarks

The MountNtmsMedia function queues a request to mount the specified media, then waits for the number of milliseconds specified in the dwTimeout parameter for the mount to complete or for an error to be detected. If RSM cannot complete the mount operation before dwTimeout expires, NTMS cancels the request and returns an error. If the specified media is in an offline library, the application might be blocked for an extended period of time. You can use the GetNtmsObjectInformation function to determine the current location of the specified medium. You can also use the NTMS_MOUNT_ERROR_OFFLINE value to generate an immediate error instead of an operator request when the media is offline.

If the specified medium is in use or a drive is not available, the process blocks up to the time-out value and returns ERROR_BUSY. If the NTMS_MOUNT_ERROR_NOT_AVAILABLE value is specified, the function returns an immediate error when a resource (media or drive) is not available.

The time-out value of INFINITE can be used to make the function wait without timing out. When a non-zero time-out value is specified in the dwTimeout parameter, RSM waits for all the media specified in lpMediaId to become mounted. If the specified time elapses before all the media is mounted, the MountNtmsMedia function returns an error and cancels the request. The application can examine the status returned and resubmit the request if desired.

When multiple media to be mounted are specified with a single call, all the specified media must be in a single library. If any of the specified media are offline, none of the media will be mounted until all the media are online.

At the completion of the mount the drive state (for example, fix or variable mode) is not defined. The application must set up the drive.

The CloseNtmsSession function can be used to cancel a mount that is pending. The default behavior is:

• If the specified medium is offline, RSM posts an operator request to mount the media and the MountNtmsMedia function waits for the period of time specified in the dwTimeout parameter.
• If the specified medium is online, RSM requests the mount.
• If a drive or media is not available, RSM sends the request and the MountNtmsMedia function waits for the period of time specified in the dwTimeout parameter.

Requirements

See also

Media Services Functions