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在头文件Dbt.h中定义
/*****************************************************************************
*
*  (C) Copyright 1993 - 1998 Microsoft Corporation
*
*  Title:      DBT.H - Equates for WM_DEVICECHANGE and BroadcastSystemMessage
*
*  Version:    4.00
*
*  Date:       24-May-1993
*
*  Author:     rjc
*
*----------------------------------------------------------------------------
*
*  Change log:
*
*     DATE     REV                 DESCRIPTION
*  ----------- --- ----------------------------------------------------------
*
*****************************************************************************/#ifndef _DBT_H
#define _DBT_H/*
* BroadcastSpecialMessage constants.
*/
#define WM_DEVICECHANGE         0x0219/* XLATOFF */
#ifdef  IS_32
#define DBTFAR
#else
#define DBTFAR  far
#endif
/* XLATON */#ifndef _WCHAR_T_DEFINED
typedef unsigned short wchar_t;
#define _WCHAR_T_DEFINED
#endif#ifndef GUID_DEFINED
    #define GUID_DEFINED
    typedef struct _GUID {
        ULONG   Data1;
        unsigned short Data2;
        unsigned short Data3;
        unsigned char Data4[8];
    } GUID;
#endif // !defined(GUID_DEFINED)/*
* Broadcast message and receipient flags.
*
* Note that there is a third "flag". If the wParam has:
*
* bit 15 on:   lparam is a pointer and bit 14 is meaningfull.
* bit 15 off:  lparam is just a UNLONG data type.
*
* bit 14 on:   lparam is a pointer to an ASCIIZ string.
* bit 14 off:  lparam is a pointer to a binary struture starting with
*              a dword describing the length of the structure.
*/
#define BSF_QUERY               0x00000001
#define BSF_IGNORECURRENTTASK   0x00000002      /* Meaningless for VxDs */
#define BSF_FLUSHDISK           0x00000004      /* Shouldn't be used by VxDs */
#define BSF_NOHANG              0x00000008
#define BSF_POSTMESSAGE         0x00000010
#define BSF_FORCEIFHUNG         0x00000020
#define BSF_NOTIMEOUTIFNOTHUNG  0x00000040
#define BSF_MSGSRV32ISOK        0x80000000      /* Called synchronously from PM API */
#define BSF_MSGSRV32ISOK_BIT    31              /* Called synchronously from PM API */#define BSM_ALLCOMPONENTS       0x00000000
#define BSM_VXDS                0x00000001
#define BSM_NETDRIVER           0x00000002
#define BSM_INSTALLABLEDRIVERS  0x00000004
#define BSM_APPLICATIONS        0x00000008/*
* Message = WM_DEVICECHANGE
* wParam  = DBT_APPYBEGIN
* lParam  = (not used)
*
*      'Appy-time is now available.  This message is itself sent
*      at 'Appy-time.
*
* Message = WM_DEVICECHANGE
* wParam  = DBT_APPYEND
* lParam  = (not used)
*
*      'Appy-time is no longer available.  This message is *NOT* sent
*      at 'Appy-time.  (It cannot be, because 'Appy-time is gone.)
*
* NOTE!  It is possible for DBT_APPYBEGIN and DBT_APPYEND to be sent
* multiple times during a single Windows session.  Each appearance of
* 'Appy-time is bracketed by these two messages, but 'Appy-time may
* momentarily become unavailable during otherwise normal Windows
* processing.  The current status of 'Appy-time availability can always
* be obtained from a call to _SHELL_QueryAppyTimeAvailable.
*/
#define DBT_APPYBEGIN                   0x0000
#define DBT_APPYEND                     0x0001/*
* Message = WM_DEVICECHANGE
* wParam  = DBT_DEVNODES_CHANGED
* lParam  = 0
*
*      send when configmg finished a process tree batch. Some devnodes
*      may have been added or removed. This is used by ring3 people which
*      need to be refreshed whenever any devnode changed occur (like
*      device manager). People specific to certain devices should use
*      DBT_DEVICE* instead.
*/#define DBT_DEVNODES_CHANGED            0x0007/*
* Message = WM_DEVICECHANGE
* wParam  = DBT_QUERYCHANGECONFIG
* lParam  = 0
*
*      sent to ask if a config change is allowed
*/#define DBT_QUERYCHANGECONFIG           0x0017/*
* Message = WM_DEVICECHANGE
* wParam  = DBT_CONFIGCHANGED
* lParam  = 0
*
*      sent when a config has changed
*/#define DBT_CONFIGCHANGED               0x0018/*
* Message = WM_DEVICECHANGE
* wParam  = DBT_CONFIGCHANGECANCELED
* lParam  = 0
*
*      someone cancelled the config change
*/#define DBT_CONFIGCHANGECANCELED        0x0019/*
* Message = WM_DEVICECHANGE
* wParam  = DBT_MONITORCHANGE
* lParam  = new resolution to use (LOWORD=x, HIWORD=y)
*           if 0, use the default res for current config
*
*      this message is sent when the display monitor has changed
*      and the system should change the display mode to match it.
*/#define DBT_MONITORCHANGE               0x001B/*
* Message = WM_DEVICECHANGE
* wParam  = DBT_SHELLLOGGEDON
* lParam  = 0
*
*      The shell has finished login on: VxD can now do Shell_EXEC.
*/#define DBT_SHELLLOGGEDON               0x0020/*
* Message = WM_DEVICECHANGE
* wParam  = DBT_CONFIGMGAPI
* lParam  = CONFIGMG API Packet
*
*      CONFIGMG ring 3 call.
*/
#define DBT_CONFIGMGAPI32               0x0022/*
* Message = WM_DEVICECHANGE
* wParam  = DBT_VXDINITCOMPLETE
* lParam  = 0
*
*      CONFIGMG ring 3 call.
*/
#define DBT_VXDINITCOMPLETE             0x0023/*
* Message = WM_DEVICECHANGE
* wParam  = DBT_VOLLOCK*
* lParam  = pointer to VolLockBroadcast structure described below
*
*      Messages issued by IFSMGR for volume locking purposes on WM_DEVICECHANGE.
*      All these messages pass a pointer to a struct which has no pointers.
*/#define DBT_VOLLOCKQUERYLOCK    0x8041
#define DBT_VOLLOCKLOCKTAKEN    0x8042
#define DBT_VOLLOCKLOCKFAILED   0x8043
#define DBT_VOLLOCKQUERYUNLOCK  0x8044
#define DBT_VOLLOCKLOCKRELEASED 0x8045
#define DBT_VOLLOCKUNLOCKFAILED 0x8046/*
* Device broadcast header
*/struct _DEV_BROADCAST_HDR {     /* */
    DWORD       dbch_size;
    DWORD       dbch_devicetype;
    DWORD       dbch_reserved;
};typedef struct  _DEV_BROADCAST_HDR      DEV_BROADCAST_HDR;
typedef         DEV_BROADCAST_HDR       DBTFAR *PDEV_BROADCAST_HDR;/*
* Structure for volume lock broadcast
*/typedef struct VolLockBroadcast VolLockBroadcast;
typedef VolLockBroadcast *pVolLockBroadcast;
struct VolLockBroadcast {
        struct  _DEV_BROADCAST_HDR vlb_dbh;
        DWORD   vlb_owner;              // thread on which lock request is being issued
        BYTE    vlb_perms;              // lock permission flags defined below
        BYTE    vlb_lockType;           // type of lock
        BYTE    vlb_drive;              // drive on which lock is issued
        BYTE    vlb_flags;              // miscellaneous flags
};/*
* Values for vlb_perms
*/
#define LOCKP_ALLOW_WRITES              0x01    // Bit 0 set - allow writes
#define LOCKP_FAIL_WRITES               0x00    // Bit 0 clear - fail writes
#define LOCKP_FAIL_MEM_MAPPING          0x02    // Bit 1 set - fail memory mappings
#define LOCKP_ALLOW_MEM_MAPPING         0x00    // Bit 1 clear - allow memory mappings
#define LOCKP_USER_MASK                 0x03    // Mask for user lock flags
#define LOCKP_LOCK_FOR_FORMAT           0x04    // Level 0 lock for format/*
* Values for vlb_flags
*/
#define LOCKF_LOGICAL_LOCK              0x00    // Bit 0 clear - logical lock
#define LOCKF_PHYSICAL_LOCK             0x01    // Bit 0 set - physical lock/*
* Message = WM_DEVICECHANGE
* wParam  = DBT_NODISKSPACE
* lParam  = drive number of drive that is out of disk space (1-based)
*
* Message issued by IFS manager when it detects that a drive is run out of
* free space.
*/#define DBT_NO_DISK_SPACE               0x0047/*
* Message = WM_DEVICECHANGE
* wParam  = DBT_LOW_DISK_SPACE
* lParam  = drive number of drive that is low on disk space (1-based)
*
* Message issued by VFAT when it detects that a drive it has mounted
* has the remaning free space below a threshold specified by the
* registry or by a disk space management application.
* The broadcast is issued by VFAT ONLY when space is either allocated
* or freed by VFAT.
*/#define DBT_LOW_DISK_SPACE      0x0048#define DBT_CONFIGMGPRIVATE             0x7FFF/*
* The following messages are for WM_DEVICECHANGE. The immediate list
* is for the wParam. ALL THESE MESSAGES PASS A POINTER TO A STRUCT
* STARTING WITH A DWORD SIZE AND HAVING NO POINTER IN THE STRUCT.
*
*/
#define DBT_DEVICEARRIVAL               0x8000  // system detected a new device
#define DBT_DEVICEQUERYREMOVE           0x8001  // wants to remove, may fail
#define DBT_DEVICEQUERYREMOVEFAILED     0x8002  // removal aborted
#define DBT_DEVICEREMOVEPENDING         0x8003  // about to remove, still avail.
#define DBT_DEVICEREMOVECOMPLETE        0x8004  // device is gone
#define DBT_DEVICETYPESPECIFIC          0x8005  // type specific event
#if(WINVER >= 0x040A)
#define DBT_CUSTOMEVENT                 0x8006  // user-defined event
#endif /* WINVER >= 0x040A */#define DBT_DEVTYP_OEM                  0x00000000  // oem-defined device type
#define DBT_DEVTYP_DEVNODE              0x00000001  // devnode number
#define DBT_DEVTYP_VOLUME               0x00000002  // logical volume
#define DBT_DEVTYP_PORT                 0x00000003  // serial, parallel
#define DBT_DEVTYP_NET                  0x00000004  // network resource#if(WINVER >= 0x040A)
#define DBT_DEVTYP_DEVICEINTERFACE      0x00000005  // device interface class
#define DBT_DEVTYP_HANDLE               0x00000006  // file system handle
#endif /* WINVER >= 0x040A */struct _DEV_BROADCAST_HEADER { /* */
    DWORD       dbcd_size;
    DWORD       dbcd_devicetype;
    DWORD       dbcd_reserved;
};struct _DEV_BROADCAST_OEM {     /* */
    DWORD       dbco_size;
    DWORD       dbco_devicetype;
    DWORD       dbco_reserved;
    DWORD       dbco_identifier;
    DWORD       dbco_suppfunc;
};typedef struct  _DEV_BROADCAST_OEM      DEV_BROADCAST_OEM;
typedef         DEV_BROADCAST_OEM       DBTFAR *PDEV_BROADCAST_OEM;struct _DEV_BROADCAST_DEVNODE { /* */
    DWORD       dbcd_size;
    DWORD       dbcd_devicetype;
    DWORD       dbcd_reserved;
    DWORD       dbcd_devnode;
};typedef struct  _DEV_BROADCAST_DEVNODE  DEV_BROADCAST_DEVNODE;
typedef         DEV_BROADCAST_DEVNODE   DBTFAR *PDEV_BROADCAST_DEVNODE;struct _DEV_BROADCAST_VOLUME { /* */
    DWORD       dbcv_size;
    DWORD       dbcv_devicetype;
    DWORD       dbcv_reserved;
    DWORD       dbcv_unitmask;
    WORD        dbcv_flags;
};typedef struct  _DEV_BROADCAST_VOLUME   DEV_BROADCAST_VOLUME;
typedef         DEV_BROADCAST_VOLUME    DBTFAR *PDEV_BROADCAST_VOLUME;#define DBTF_MEDIA      0x0001          // media comings and goings
#define DBTF_NET        0x0002          // network volumetypedef struct _DEV_BROADCAST_PORT_A {
    DWORD       dbcp_size;
    DWORD       dbcp_devicetype;
    DWORD       dbcp_reserved;
    char        dbcp_name[1];
} DEV_BROADCAST_PORT_A, *PDEV_BROADCAST_PORT_A;typedef struct _DEV_BROADCAST_PORT_W {
    DWORD       dbcp_size;
    DWORD       dbcp_devicetype;
    DWORD       dbcp_reserved;
    wchar_t     dbcp_name[1];
} DEV_BROADCAST_PORT_W, DBTFAR *PDEV_BROADCAST_PORT_W;#ifdef UNICODE
typedef DEV_BROADCAST_PORT_W     DEV_BROADCAST_PORT;
typedef PDEV_BROADCAST_PORT_W    PDEV_BROADCAST_PORT;
#else
typedef DEV_BROADCAST_PORT_A     DEV_BROADCAST_PORT;
typedef PDEV_BROADCAST_PORT_A    PDEV_BROADCAST_PORT;
#endifstruct _DEV_BROADCAST_NET { /* */
    DWORD       dbcn_size;
    DWORD       dbcn_devicetype;
    DWORD       dbcn_reserved;
    DWORD       dbcn_resource;
    DWORD       dbcn_flags;
};typedef struct  _DEV_BROADCAST_NET      DEV_BROADCAST_NET;
typedef         DEV_BROADCAST_NET       DBTFAR *PDEV_BROADCAST_NET;#if(WINVER >= 0x040A)typedef struct _DEV_BROADCAST_DEVICEINTERFACE_A {
    DWORD       dbcc_size;
    DWORD       dbcc_devicetype;
    DWORD       dbcc_reserved;
    GUID        dbcc_classguid;
    char        dbcc_name[1];
} DEV_BROADCAST_DEVICEINTERFACE_A, *PDEV_BROADCAST_DEVICEINTERFACE_A;typedef struct _DEV_BROADCAST_DEVICEINTERFACE_W {
    DWORD       dbcc_size;
    DWORD       dbcc_devicetype;
    DWORD       dbcc_reserved;
    GUID        dbcc_classguid;
    wchar_t     dbcc_name[1];
} DEV_BROADCAST_DEVICEINTERFACE_W, *PDEV_BROADCAST_DEVICEINTERFACE_W;#ifdef UNICODE
typedef DEV_BROADCAST_DEVICEINTERFACE_W   DEV_BROADCAST_DEVICEINTERFACE;
typedef PDEV_BROADCAST_DEVICEINTERFACE_W  PDEV_BROADCAST_DEVICEINTERFACE;
#else
typedef DEV_BROADCAST_DEVICEINTERFACE_A   DEV_BROADCAST_DEVICEINTERFACE;
typedef PDEV_BROADCAST_DEVICEINTERFACE_A  PDEV_BROADCAST_DEVICEINTERFACE;
#endiftypedef struct _DEV_BROADCAST_HANDLE {
    DWORD       dbch_size;
    DWORD       dbch_devicetype;
    DWORD       dbch_reserved;
    HANDLE      dbch_handle;     // file handle used in call to RegisterDeviceNotification
    DWORD       dbch_hdevnotify; // HDEVNOTIFY returned from RegisterDeviceNotification
    //
    // The following 3 fields are only valid if wParam is DBT_CUSTOMEVENT.
    //
    GUID        dbch_eventguid;
    LONG        dbch_nameoffset; // offset (bytes) of variable-length string buffer (-1 if none)
    BYTE        dbch_data[1];    // variable-sized buffer, potentially containing binary and/or text data
} DEV_BROADCAST_HANDLE, *PDEV_BROADCAST_HANDLE;#endif /* WINVER >= 0x040A */#define DBTF_RESOURCE   0x00000001      // network resource
#define DBTF_XPORT      0x00000002      // new transport coming or going
#define DBTF_SLOWNET    0x00000004      // new incoming transport is slow
                                        // (dbcn_resource undefined for now)#define DBT_VPOWERDAPI  0x8100          // VPOWERD API for Win95/*
*  User-defined message types all use wParam = 0xFFFF with the
*  lParam a pointer to the structure below.
*
*  dbud_dbh - DEV_BROADCAST_HEADER must be filled in as usual.
*
*  dbud_szName contains a case-sensitive ASCIIZ name which names the
*  message.  The message name consists of the vendor name, a backslash,
*  then arbitrary user-defined ASCIIZ text.  For example:
*
*      "WidgetWare\QueryScannerShutdown"
*      "WidgetWare\Video Q39S\AdapterReady"
*
*  After the ASCIIZ name, arbitrary information may be provided.
*  Make sure that dbud_dbh.dbch_size is big enough to encompass
*  all the data.  And remember that nothing in the structure may
*  contain pointers.
*/#define DBT_USERDEFINED 0xFFFFstruct _DEV_BROADCAST_USERDEFINED { /* */
    struct _DEV_BROADCAST_HDR dbud_dbh;
    char        dbud_szName[1];     /* ASCIIZ name */
/*  BYTE        dbud_rgbUserDefined[];*/ /* User-defined contents */
};#endif  // _DBT_H

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