用Delphi通过SetupAPI.dll列举和停用硬件设备

来源：作者：出处：巧巧读书 2007-10-09 进入讨论组

　　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}
unitSetupAPI;
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=typeCardinal;
　DI_FUNCTION=typeCardinal;
　
　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;{(DIFcode)}
　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;
functionSetupDiGetClassDevs(constClassGuid:PGUID;Enumerator:PChar;
　hwndParent:HWND;Flags:DWORD):HDEVINFO;stdcall;
　external'Setupapi.dll'name'SetupDiGetClassDevsA';
functionSetupDiEnumDeviceInfo(DeviceInfoSet:HDEVINFO;MemberIndex:DWORD;
　DeviceInfoData:PSP_DEVINFO_DATA):BOOL;stdcall;
　external'Setupapi.dll'name'SetupDiEnumDeviceInfo';
functionSetupDiGetDeviceRegistryProperty(DeviceInfoSet:HDEVINFO;
　DeviceInfoData:PSP_DEVINFO_DATA;Propertys:DWORD;PropertyRegDataType:PWORD;
　PropertyBuffer:PByte;PropertyBufferSize:DWORD;RequiredSize:PWORD):BOOL;stdcall;
　external'Setupapi.dll'name'SetupDiGetDeviceRegistryPropertyA';
functionSetupDiDestroyDeviceInfoList(DeviceInfoSet:HDEVINFO):BOOL;stdcall;
　external'Setupapi.dll'name'SetupDiDestroyDeviceInfoList';
functionSetupDiClassNameFromGuid(ClassGuid:PGUID;ClassName:PChar;
　ClassNameSize:DWORD;RequiredSize:PDWORD):BOOL;stdcall;
　external'Setupapi.dll'name'SetupDiClassNameFromGuidA';
functionSetupDiSetClassInstallParams(DeviceInfoSet:HDEVINFO;
　DeviceInfoData:PSP_DEVINFO_DATA;ClassInstallParams:PSP_CLASSINSTALL_HEADER;
　ClassInstallParamsSize:DWORD):BOOLstdcall;
　external'Setupapi.dll'name'SetupDiSetClassInstallParamsA';
functionSetupDiCallClassInstaller(InstallFunction:DI_FUNCTION;
　DeviceInfoSet:HDEVINFO;DeviceInfoData:PSP_DEVINFO_DATA):BOOL;stdcall;
　external'Setupapi.dll'name'SetupDiCallClassInstaller';
functionSetupDiGetClassImageList(ClassImageListData:PSP_CLASSIMAGELIST_DATA):BOOL;
　stdcall;external'Setupapi.dll'name'SetupDiGetClassImageList';
functionSetupDiDestroyClassImageList(ClassImageListData:PSP_CLASSIMAGELIST_DATA):
　BOOL;stdcall;external'Setupapi.dll'name'SetupDiDestroyClassImageList';
functionSetupDiGetClassImageIndex(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}
unituntMain;
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;
　　procedurebtn1Click(Sender:TObject);
　private
　　functionGetDeviceClassName(aGUID:TGUID):string;
　　{Privatedeclarations}
　public
　　{Publicdeclarations}
　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}
procedureTForm1.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_PRESENTorDIGCF_ALLCLASSES);
　ifhDevInfo=INVALID_HANDLE_VALUEthenExit;
　{设备图标数据结构}
　ClassImageListData.cbSize:=SizeOf(SP_CLASSIMAGELIST_DATA);
　{获取设备图标数据}
　ifSetupDiGetClassImageList(@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}
　whileSetupDiEnumDeviceInfo(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}
　　ifSetupDiGetClassImageIndex(@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}
　　ifIsDisableable(i,hDevInfo)then
　　　List.SubItems.Add('True')
　　else
　　　List.SubItems.Add('False');
　　
　end;
　ifBuffer<>nilthenFreeMem(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}
functionTForm1.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}
　whilenotSetupDiClassNameFromGuid(@aGUID,ClassName,ClassNameSize,
　　@ClassNameSize)do
　begin
　　ifGetLastError()=ERROR_INSUFFICIENT_BUFFERthen
　　begin
　　　ifClassName<>nilthenFreeMem(ClassName);
　　　GetMem(ClassName,ClassNameSize);
　　endelse
　　　Break;
　end;
　Result:=ClassName;
　ifClassName<>nilthenFreeMem(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.}
functionChangeDeviceState(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);
　ifnotSetupDiEnumDeviceInfo(hDevInfo,SelectedItem,@DeviceInfoData)thenExit;
　//SetthePropChangeParamsstructure.
　PropChangeParams.ClassInstallHeader.cbSize:=SizeOf(SP_CLASSINSTALL_HEADER);
　PropChangeParams.ClassInstallHeader.InstallFunction:=DIF_PROPERTYCHANGE;
　PropChangeParams.Scope:=DICS_FLAG_GLOBAL;
　PropChangeParams.StateChange:=NewStatus;
　ifnotSetupDiSetClassInstallParams(hDevInfo,@DeviceInfoData,
　　PSP_CLASSINSTALL_HEADER(@PropChangeParams),SizeOf(PropChangeParams))then
　　Exit;
　//CalltheClassInstallerandperformthechange.
　ifnotSetupDiCallClassInstaller(DIF_PROPERTYCHANGE,hDevInfo,
　　@DeviceInfoData)then
　　Exit;
　Result:=True;
end;
functionControlDisk(nStatus,nIndex:Integer):Boolean;
var
　Guid:TGUID;
　GUIDString:string;
　hDevInfo:Cardinal;
　i:DWORD;
　DeviceInfoData:SP_DEVINFO_DATA;
begin
　Result:=False;
　if(nStatus=-1)thenExit;
　ZeroMemory(@Guid,sizeof(TGUID));
　casenIndexof
　　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)thenExit;
　ZeroMemory(@DeviceInfoData,SizeOf(SP_DEVINFO_DATA));
　DeviceInfoData.cbSize:=SizeOf(SP_DEVINFO_DATA);
　i:=0;
　whileSetupDiEnumDeviceInfo(hDevInfo,i,@DeviceInfoData)do
　begin
　　ifnStatus　=1then
　　　Result:=ChangeDeviceState(hDevInfo,DICS_ENABLE,i)
　　elseifnStatus=2then
　　　Result:=ChangeDeviceState(hDevInfo,DICS_DISABLE,i);
　　Inc(i);
　end;
　SetupDiDestroyDeviceInfoList(hDevInfo);
end;
{调用如下:禁用光驱:ifControlDisk(DICS_DISABLE,1)thenShowMessage('成功禁用!');}
{启用光驱:ifControlDisk(DICS_ENABLE,1)thenShowMessage('启用成功!');}
{注意USB要调用2次ControlDisk(DICS_ENABLE,2)才能完成启用.}