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Код:
////////////////////////////////////////////////////////////////////////////////
//
// ****************************************************************************
// * Unit Name : USBStateChange
// * Purpose : Пример включения.отключения USB накопителей
// * Author : Александр (Rouse_) Багель
// * Copyright : © Fangorn Wizards Lab 1998 - 2007
// * Version : 1.00
// * Home Page : http://rouse.drkb.ru
// ****************************************************************************
//
unit USBStateChange;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm6 = class(TForm)
btnEnable: TButton;
btnDisable: TButton;
procedure btnEnableClick(Sender: TObject);
procedure btnDisableClick(Sender: TObject);
end;
var
Form6: TForm6;
implementation
{$R *.dfm}
type
PSP_CLASSINSTALL_HEADER = ^SP_CLASSINSTALL_HEADER;
SP_CLASSINSTALL_HEADER = record
cbSize: DWORD;
InstallFunction: Cardinal;
end;
PSP_PROPCHANGE_PARAMS = ^SP_PROPCHANGE_PARAMS;
SP_PROPCHANGE_PARAMS = record
ClassInstallHeader: SP_CLASSINSTALL_HEADER;
StateChange: DWORD;
Scope: DWORD;
HwProfile: DWORD;
end;
PSP_DEVINFO_DATA = ^SP_DEVINFO_DATA;
SP_DEVINFO_DATA = record
cbSize: DWORD;
ClassGuid: TGUID;
DevInst: DWORD;
Reserved: Longint;
end;
function SetupDiGetClassDevs(const ClassGuid: PGUID; Enumerator: PChar;
hwndParent: HWND; Flags: DWORD): DWORD; stdcall;
external 'Setupapi.dll' name 'SetupDiGetClassDevsA';
function SetupDiDestroyDeviceInfoList(DeviceInfoSet: DWORD): BOOL; stdcall;
external 'Setupapi.dll';
function SetupDiEnumDeviceInfo(DeviceInfoSet: DWORD; MemberIndex: DWORD;
DeviceInfoData: PSP_DEVINFO_DATA): BOOL; stdcall;
external 'Setupapi.dll';
function SetupDiCallClassInstaller(InstallFunction: DWORD;
DeviceInfoSet: DWORD; DeviceInfoData: PSP_DEVINFO_DATA): BOOL; stdcall;
external 'setupapi.dll';
function SetupDiGetDeviceRegistryProperty(DeviceInfoSet: DWORD;
DeviceInfoData: PSP_DEVINFO_DATA; Propertys: DWORD; PropertyRegDataType: PWORD;
PropertyBuffer: PByte; PropertyBufferSize: DWORD; RequiredSize: PWORD): BOOL; stdcall;
external 'Setupapi.dll' name 'SetupDiGetDeviceRegistryPropertyA';
function SetupDiSetClassInstallParams(DeviceInfoSet: DWORD;
DeviceInfoData: PSP_DEVINFO_DATA; ClassInstallParams: PSP_CLASSINSTALL_HEADER;
ClassInstallParamsSize: DWORD): BOOL; stdcall;
external 'setupapi.dll' name 'SetupDiSetClassInstallParamsA';
const
DICS_ENABLE = $00000001;
DICS_DISABLE = $00000002;
DIF_PROPERTYCHANGE = $00000012;
DICS_FLAG_GLOBAL = $00000001;
DIGCF_PRESENT = $00000002;
SPDRP_COMPATIBLEIDS = $00000002;
DISK_GUID: TGUID = '{4D36E967-E325-11CE-BFC1-08002BE10318}';
function ChangeDeviceState(AState: DWORD): Boolean;
var
pcp: SP_PROPCHANGE_PARAMS;
DevInfoData: SP_DEVINFO_DATA;
hDevInfo1: DWORD;
I, DataT, Buffersize: DWORD;
Buffer: PAnsiChar;
begin
Result := False;
pcp.ClassInstallHeader.cbSize := sizeof(SP_CLASSINSTALL_HEADER);
pcp.ClassInstallHeader.InstallFunction := DIF_PROPERTYCHANGE;
pcp.StateChange := AState;
pcp.Scope := DICS_FLAG_GLOBAL;
pcp.HwProfile := 0;
hDevInfo1 := SetupDiGetClassDevs(@DISK_GUID, nil, HWND(nil), DIGCF_PRESENT);
try
DevInfoData.cbSize := sizeof(SP_DEVINFO_DATA);
I := 0;
Buffersize := 500;
GetMem(Buffer, Buffersize);
try
while SetupDiEnumDeviceInfo(hDevInfo1, I, @DevInfoData) do
begin
SetupDiGetDeviceRegistryProperty(hDevInfo1, @DevInfoData,
SPDRP_COMPATIBLEIDS, @DataT, PByte(Buffer), Buffersize, nil);
if buffer = 'USBSTOR\Disk' then
begin
if not SetupDiSetClassInstallParams(hDevInfo1,
@DevInfoData, PSP_CLASSINSTALL_HEADER(@pcp), SizeOf(pcp)) then Exit;
if not SetupDiCallClassInstaller(
DIF_PROPERTYCHANGE, hDevInfo1, @DevInfoData) then Exit;
Result := True;
end;
Inc(I);
end;
finally
FreeMem(Buffer);
end;
finally
SetupDiDestroyDeviceInfoList(hDevInfo1);
end;
end;
procedure TForm6.btnEnableClick(Sender: TObject);
begin
if ChangeDeviceState(DICS_ENABLE) then
ShowMessage('Устройство включено');
end;
procedure TForm6.btnDisableClick(Sender: TObject);
begin
if ChangeDeviceState(DICS_DISABLE) then
ShowMessage('Устройство отключено');
end;
end.