Arsip: Safely Remove USB Mass Storage Device (Unplug/Eject USB)

program USBEject;
uses
Windows;
const
setupapi = 'SetupApi.dll';
type
HDEVINFO = THandle;
PSP_DEVINFO_DATA = ^SP_DEVINFO_DATA;
SP_DEVINFO_DATA = packed record
cbSize: DWORD;
ClassGuid: TGUID;
DevInst: DWORD;
Reserved: DWORD;
end;
function SetupDiGetClassDevsA(ClassGuid: PGUID; Enumerator: PChar; hwndParent: HWND; Flags: DWORD): HDEVINFO; stdcall; external setupapi;
function SetupDiEnumDeviceInfo(DeviceInfoSet: HDEVINFO; MemberIndex: DWORD; DeviceInfoData: PSP_DEVINFO_DATA): boolean; stdcall; external setupapi;
function SetupDiDestroyDeviceInfoList(DeviceInfoSet: HDEVINFO): boolean; stdcall; external setupapi;
function CM_Get_Parent(pdnDevInst: PDWORD; dnDevInst: DWORD; ulFlags: DWORD): DWORD; stdcall; external setupapi;
function CM_Get_Device_ID_Size(pulLen: PDWORD; dnDevInst: DWORD; ulFlags: DWORD): DWORD; stdcall; external setupapi;
function CM_Get_Device_IDA(dnDevInst: DWORD; Buffer: PChar; BufferLen: DWORD; ulFlags: DWORD): DWORD; stdcall; external setupapi;
function CM_Locate_DevNodeA(pdnDevInst: PDWORD; pDeviceID: PChar; ulFlags: DWORD): DWORD; stdcall; external setupapi;
function CM_Request_Device_EjectA(dnDevInst: DWORD; pVetoType: Pointer; pszVetoName: PChar; ulNameLength: DWORD; ulFlags: DWORD): DWORD; stdcall; external setupapi;
function IsUSBDevice(DevInst: DWORD): boolean;
function CompareMem(p1, p2: Pointer; len: DWORD): boolean;
var
i: DWORD;
begin
result := false;
if len = 0 then
exit;
for i := 0 to len-1 do
if PByte(DWORD(p1) + i)^ <> PByte(DWORD(p2) + i)^ then
exit;
result := true;
end;
var
IDLen: DWORD;
ID: PChar;
begin
result := false;
if (CM_Get_Device_ID_Size(@IDLen, DevInst, 0) <> 0) or (IDLen = 0) then
exit;
inc(IDLen);
ID := GetMemory(IDLen);
if ID = nil then
exit;
if (CM_Get_Device_IDA(DevInst, ID, IDLen, 0) <> 0) or (not CompareMem(ID, PChar('USBSTOR'), 7)) then
begin
FreeMemory(ID);
exit;
end;
FreeMemory(ID);
result := true;
end;
procedure EjectUSB();
const
GUID_DEVCLASS_DISKDRIVE: TGUID = (D1: $4D36E967; D2: $E325; D3: $11CE; D4: ($BF, $C1, $08, $00, $2B, $E1, $03, $18));
var
hDevInfoSet: HDEVINFO;
DevInfo: SP_DEVINFO_DATA;
i: Integer;
Parent: DWORD;
VetoName: PChar;
begin
DevInfo.cbSize := sizeof(SP_DEVINFO_DATA);
hDevInfoSet := SetupDiGetClassDevsA(@GUID_DEVCLASS_DISKDRIVE, nil, 0, 2);
if hDevInfoSet = INVALID_HANDLE_VALUE then
exit;
i := 0;
while (SetupDiEnumDeviceInfo(hDevInfoSet, i, @DevInfo)) do
begin
if (IsUSBDevice(DevInfo.DevInst)) and (CM_Get_Parent(@Parent, DevInfo.DevInst, 0) = 0) then
begin
VetoName := GetMemory(260);
if (CM_Request_Device_EjectA(Parent, nil, VetoName, 260, 0) <> 0) then
begin
if (CM_Locate_DevNodeA(@Parent, VetoName, 0) <> 0) then
begin
FreeMemory(VetoName);
continue;
end;
FreeMemory(VetoName);
if (CM_Request_Device_EjectA(Parent, nil, nil, 0, 0) <> 0) then continue;
end;
FreeMemory(VetoName);
break;
end;
inc(i);
end;
SetupDiDestroyDeviceInfoList(hDevInfoSet);
end;
begin
if MessageBoxA(0, 'Mo di unplug USB-disk?', 'Konfirmasi', MB_YESNO) = ID_YES then
EjectUSB();
end.