DEV_BROADCAST_VOLUME structure (dbt.h)
Contains information about a logical volume.
Syntax
typedef struct _DEV_BROADCAST_VOLUME {
DWORD dbcv_size;
DWORD dbcv_devicetype;
DWORD dbcv_reserved;
DWORD dbcv_unitmask;
WORD dbcv_flags;
} DEV_BROADCAST_VOLUME;
Members
dbcv_size
The size of this structure, in bytes.
dbcv_devicetype
Set to DBT_DEVTYP_VOLUME (2).
dbcv_reserved
Reserved; do not use.
dbcv_unitmask
The logical unit mask identifying one or more logical units. Each bit in the mask corresponds to one logical drive. Bit 0 represents drive A, bit 1 represents drive B, and so on.
dbcv_flags
This parameter can be one of the following values.
| Value | Meaning |
|---|---|
|
Change affects media in drive. If not set, change affects physical device or drive. |
|
Indicated logical volume is a network volume. |
Remarks
Although the dbcv_unitmask member may specify more than one volume in any message, this does not guarantee that only one message is generated for a specified event. Multiple system features may independently generate messages for logical volumes at the same time.
Messages for media arrival and removal are sent only for media in devices that support a soft-eject mechanism. For example, applications will not see media-related volume messages for floppy disks.
Messages for network drive arrival and removal are not sent whenever network commands are issued, but rather when network connections will disappear as the result of a hardware event.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP |
| Minimum supported server | Windows Server 2003 |
| Header | dbt.h |