_DEV_BROADCAST_USERDEFINED structure (dbt.h)

Contains the user-defined event and optional data associated with the DBT_USERDEFINED device event.

Syntax

struct _DEV_BROADCAST_USERDEFINED {
  struct _DEV_BROADCAST_HDR dbud_dbh;
  char                      dbud_szName[1];
};

Members

dbud_dbh

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

dbud_szName[1]

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

Remarks

Because this structure contains variable length fields, use it as a template for creating a pointer to a user-defined structure. Note that the structure must not contain pointers. The following example shows such a user-defined structure.

#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;

Requirements

See also

DBT_USERDEFINED

DEV_BROADCAST_HDR

WM_DEVICECHANGE