用Delphi通过SetupAPI.dll列举和停用硬件设备
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前天弄的东西,通过SetupAPI.dll列举硬件设备,部分是改自MSDN自带的例子,自己加了显示设备类型名和图标.代码是我一个个加上去的有些乱.

{ Setup.pas---从SetupAPI.h里转的一些函数和常量 }
unit SetupAPI;

interface

uses
Windows;

const
DIGCF_PRESENT = $0002;
DIGCF_ALLCLASSES = $0004;
SPDRP_DEVICEDESC = 0;

DIF_PROPERTYCHANGE = 18;

DICS_ENABLE = 1;
DICS_FLAG_GLOBAL = 1;
DICS_DISABLE = 2;

type
HDEVINFO = type Cardinal;
DI_FUNCTION = type Cardinal;

PSP_DEVINFO_DATA = ^SP_DEVINFO_DATA;
SP_DEVINFO_DATA = record
cbSize: DWORD;
ClassGuid: TGUID;
DevInst: DWORD;
Reserved: Longint;
end;

PSP_CLASSINSTALL_HEADER = ^SP_CLASSINSTALL_HEADER;
SP_CLASSINSTALL_HEADER = record
cbSize: DWORD;
InstallFunction: DI_FUNCTION; { (DIF code) }
end;

PSP_PROPCHANGE_PARAMS = ^SP_PROPCHANGE_PARAMS;
SP_PROPCHANGE_PARAMS = record
ClassInstallHeader: SP_CLASSINSTALL_HEADER;
StateChange: DWORD;
Scope: DWORD;
HwProfile: DWORD;
end;

PSP_CLASSIMAGELIST_DATA = ^SP_CLASSIMAGELIST_DATA;
SP_CLASSIMAGELIST_DATA = record
cbSize: DWORD;
ImageList: HWND;
Reserved: DWORD;
end;

function SetupDiGetClassDevs(const ClassGuid: PGUID; Enumerator: PChar;
hwndParent: HWND; Flags: DWORD): HDEVINFO; stdcall;
external 'Setupapi.dll' name 'SetupDiGetClassDevsA';

function SetupDiEnumDeviceInfo(DeviceInfoSet: HDEVINFO; MemberIndex: DWORD;
DeviceInfoData: PSP_DEVINFO_DATA): BOOL; stdcall;
external 'Setupapi.dll' name 'SetupDiEnumDeviceInfo';

function SetupDiGetDeviceRegistryProperty(DeviceInfoSet: HDEVINFO;
DeviceInfoData: PSP_DEVINFO_DATA; Propertys: DWORD; PropertyRegDataType: PWORD;
PropertyBuffer: PByte; PropertyBufferSize: DWORD; RequiredSize: PWORD): BOOL; stdcall;
external 'Setupapi.dll' name 'SetupDiGetDeviceRegistryPropertyA';

function SetupDiDestroyDeviceInfoList(DeviceInfoSet: HDEVINFO): BOOL; stdcall;
external 'Setupapi.dll' name 'SetupDiDestroyDeviceInfoList';

function SetupDiClassNameFromGuid(ClassGuid: PGUID; ClassName: PChar;
ClassNameSize: DWORD; RequiredSize: PDWORD): BOOL; stdcall;
external 'Setupapi.dll' name 'SetupDiClassNameFromGuidA';

function SetupDiSetClassInstallParams(DeviceInfoSet: HDEVINFO ;
DeviceInfoData: PSP_DEVINFO_DATA; ClassInstallParams: PSP_CLASSINSTALL_HEADER;
ClassInstallParamsSize: DWORD): BOOL stdcall;
external 'Setupapi.dll' name 'SetupDiSetClassInstallParamsA';

function SetupDiCallClassInstaller(InstallFunction: DI_FUNCTION;
DeviceInfoSet: HDEVINFO; DeviceInfoData: PSP_DEVINFO_DATA): BOOL; stdcall;
external 'Setupapi.dll' name 'SetupDiCallClassInstaller';

function SetupDiGetClassImageList(ClassImageListData: PSP_CLASSIMAGELIST_DATA): BOOL;
stdcall; external 'Setupapi.dll' name 'SetupDiGetClassImageList';

function SetupDiDestroyClassImageList(ClassImageListData: PSP_CLASSIMAGELIST_DATA):
BOOL; stdcall; external 'Setupapi.dll' name 'SetupDiDestroyClassImageList';

function SetupDiGetClassImageIndex(ClassImageListData: PSP_CLASSIMAGELIST_DATA;
ClassGuid: PGUID; ImageIndex: PINT): BOOL; stdcall;
external 'Setupapi.dll' name 'SetupDiGetClassImageIndex';

implementation

end.

{ untMain.pas主窗体单元,Uses部分引用上面的pas,
再加1个BUTTON;1个TListView;1个TImageList,定义看代码 }

unit untMain;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, SetupAPI, StdCtrls, ComCtrls, ImgList;

type
TForm1 = class(TForm)
lv1: TListView;
btn1: TButton;
il1: TImageList;
procedure btn1Click(Sender: TObject);
private
function GetDeviceClassName(aGUID: TGUID): string;
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;
ClassImageListData: SP_CLASSIMAGELIST_DATA; {设备类型图标结构,全局变量,退出时释放.}

implementation

{$R *.dfm}

procedure TForm1.btn1Click(Sender: TObject);
var
hDevInfo: Cardinal;
DeviceInfoData: SP_DEVINFO_DATA; {设备信息结构}
i: Integer;
DataT, Buffersize: DWORD;
Buffer: PAnsiChar;
List: TListItem;
index: Integer;
begin
{ 获取设备信息句柄 }
lv1.Items.BeginUpdate;
DriverInfoData.cbSize := SizeOf(SP_DRVINFO_DATA_A);
hDevInfo := SetupDiGetClassDevs(nil, 0, 0,
DIGCF_PRESENT or DIGCF_ALLCLASSES);
if hDevInfo = INVALID_HANDLE_VALUE then Exit;
{ 设备图标数据结构 }
ClassImageListData.cbSize := SizeOf(SP_CLASSIMAGELIST_DATA);
{ 获取设备图标数据 }
if SetupDiGetClassImageList(@ClassImageListData) then
begin
{ 赋句柄给ImageList }
il1.Handle := ClassImageListData.ImageList;
{ TreeView图标指定到ImageList }
lv1.SmallImages := il1;
end;

i := 0;
Buffersize := 256;
DeviceInfoData.cbSize := SizeOf(SP_DEVINFO_DATA);
GetMem(Buffer, Buffersize);
{ 枚举设备信息 }
while SetupDiEnumDeviceInfo(hDevInfo, i, @DeviceInfoData) do
begin

{ 获取设备信息包括GUID和名称 }
SetupDiGetDeviceRegistryProperty(hDevInfo, @DeviceInfoData,
SPDRP_DEVICEDESC, @DataT, PByte(Buffer), Buffersize, nil);
Inc(i);
List := lv1.Items.Add;
{ 获取制定GUID(设备类型)的图标索引 }
if SetupDiGetClassImageIndex(@ClassImageListData,
@DeviceInfoData.ClassGuid, @index) then
{ 制定显示图标 }
List.ImageIndex := index;
{ 通过GUID获取设备类型(Class) }
List.Caption := GetDeviceClassName(DeviceInfoData.ClassGuid);
{ 转换GUID到字符串 }
List.SubItems.Add(GUIDToString(DeviceInfoData.ClassGuid));
{ 显示设备名称 }
List.SubItems.Add(Buffer);
{ 设备状态 }
if IsDisableable(i ,hDevInfo) then
List.SubItems.Add('True')
else
List.SubItems.Add('False');

end;
if Buffer <> nil then FreeMem(Buffer);
if (GetLastError() <> NO_ERROR) and
(GetLastError() <> ERROR_NO_MORE_ITEMS) then
Exit;
{ 释放 DeviceInfoData, hDevInfo }
SetupDiDestroyDeviceInfoList(hDevInfo);
lv1.Items.EndUpdate;
end;

{最后在退出程序时释放 SetupDiDestroyClassImageList(@ClassImageListData); }


{ 获取设备类型 }
function TForm1.GetDeviceClassName(aGUID: TGUID): string;
var
ClassName: PChar;
ClassNameSize: DWORD;
begin
ClassNameSize := 0;
GetMem(ClassName, ClassNameSize);
{ 利用GUID返回设备类型名 }
while not SetupDiClassNameFromGuid(@aGUID, ClassName, ClassNameSize,
@ClassNameSize) do
begin
if GetLastError() = ERROR_INSUFFICIENT_BUFFER then
begin
if ClassName <> nil then FreeMem(ClassName);
GetMem(ClassName, ClassNameSize);
end else
Break;
end;
Result := ClassName;
if ClassName <> nil then FreeMem(ClassName);
end;

end.



{设备禁用的代码,是从网上改些一个C++代码的,还没来得及加注解,先看着,以后加.}

function ChangeDeviceState(hDevInfo: HDEVINFO; NewStatus: DWORD;
SelectedItem: DWORD): Boolean;
var
PropChangeParams: SP_PROPCHANGE_PARAMS;
DeviceInfoData: SP_DEVINFO_DATA;
begin
Result := False;

DeviceInfoData.cbSize := SizeOf(SP_DEVINFO_DATA);
if not SetupDiEnumDeviceInfo(hDevInfo, SelectedItem, @DeviceInfoData) then Exit;

// Set the PropChangeParams structure.
PropChangeParams.ClassInstallHeader.cbSize := SizeOf(SP_CLASSINSTALL_HEADER);
PropChangeParams.ClassInstallHeader.InstallFunction := DIF_PROPERTYCHANGE;
PropChangeParams.Scope := DICS_FLAG_GLOBAL;
PropChangeParams.StateChange := NewStatus;

if not SetupDiSetClassInstallParams(hDevInfo, @DeviceInfoData,
PSP_CLASSINSTALL_HEADER(@PropChangeParams), SizeOf(PropChangeParams)) then
Exit;

// Call the ClassInstaller and perform the change.
if not SetupDiCallClassInstaller(DIF_PROPERTYCHANGE, hDevInfo,
@DeviceInfoData) then
Exit;

Result := True;
end;

function ControlDisk(nStatus, nIndex: Integer): Boolean;
var
Guid: TGUID ;
GUIDString: string;
hDevInfo: Cardinal;
i: DWORD;
DeviceInfoData: SP_DEVINFO_DATA;
begin
Result := False;
if (nStatus = -1) then Exit;

ZeroMemory(@Guid, sizeof(TGUID));
case nIndex of
0: // 0 代表软驱
GUIDString := '{4D36E980-E325-11CE-BFC1-08002BE10318}';
1: // 1 代表光驱
GUIDString := '{4D36E965-E325-11CE-BFC1-08002BE10318}';
2: // 2 代表USB
GUIDString := '{36FC9E60-C465-11CF-8056-444553540000}';
end;
Guid := StringToGUID(GUIDString);

hDevInfo := SetupDiGetClassDevs(@Guid, nil, HWND(nil), DIGCF_PRESENT);
if (hDevInfo = INVALID_HANDLE_VALUE) then Exit;

ZeroMemory(@DeviceInfoData, SizeOf(SP_DEVINFO_DATA));
DeviceInfoData.cbSize := SizeOf(SP_DEVINFO_DATA);

i := 0;
while SetupDiEnumDeviceInfo(hDevInfo, i, @DeviceInfoData) do
begin
if nStatus = 1 then
Result := ChangeDeviceState(hDevInfo, DICS_ENABLE, i)
else if nStatus = 2 then
Result := ChangeDeviceState(hDevInfo, DICS_DISABLE, i);
Inc(i);
end;

SetupDiDestroyDeviceInfoList(hDevInfo);
end;


{ 调用如下: 禁用光驱: if ControlDisk(DICS_DISABLE, 1) then ShowMessage('成功禁用!'); }

{ 启用光驱: if ControlDisk(DICS_ENABLE, 1) then ShowMessage('启用成功!'); }

{ 注意USB要调用2次 ControlDisk(DICS_ENABLE, 2)才能完成启用. }