_DEV_BROADCAST_USERDEFINED

The _DEV_BROADCAST_USERDEFINED structure contains the user-defined message and optional data associated with the DBT_USERDEFINED device message.

struct _DEV_BROADCAST_USERDEFINED {
struct _DEV_BROADCAST_HDR dbud_dbh;
char dbud_szName[1]; // ASCIIZ name
// BYTE dbud_rgbUserDefined[]; // Optional user-defined contents
};

Members

dbud_dbh

Information about the device affected by a WM_DEVICECHANGE message as specified by the DEV_BROADCAST_HDR structure. Because the _DEV_BROADCAST_USERDEFINED structure is variable length, dbud_dbh.dbch_size must be the size in bytes of the entire structure, including the variable length part.

dbud_szName

A case-sensitive, null-terminated string that names the message. The name must consist of the vendor name, a backslash, followed by arbitrary user-defined null-terminated text. For example:

"WidgetWare\QueryScannerShutdown"

or

"WidgetWare\Video Q39S\AdapterReady"

dbud_rgbUserDefined

Optional user-defined information.

Because this structure contains variable length fields, use this structure tag as a template for creating a pointer to a user-defined structure. Note that the structure must not contain pointers. For example:

#define NAME_LENGTH 32

#define USER_LENGTH 50

typedef struct tagWIDGET_WARE_DEV_BROADCAST_USERDEFINED
{
struct _DEV_BROADCAST_HDR DBHeader;
char szName[NAME_LENGTH]
BYTE UserDefined[USER_LENGTH];

} WIDGET_WARE_DEV_BROADCAST_USERDEFINED;

See Also

DBT_USERDEFINED, DEV_BROADCAST_HDR, WM_DEVICECHANGE

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