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Lock CDROM door

I am using Delphi 2.
How should I code in order to prevent the CDROM door from being opened?  The CDROM door should not open even when the user press the "Eject" button on the CDROM drive.  Of course, software ejecting, such as CD players should also be prevented.
Thx!
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nyt
Asked:
nyt
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1 Solution
 
intheCommented:
hi,
you can use the DeviceIOControl functions:
(note this only works in win9* not nt ,as you may be aware to acccess hardware under nt you need a device driver which cant be done in delphi)


type
TRegDWord = packed record
case Integer of
0 : (Lo,Hi : Word);
1 : (X : DWord);
end;

TDevIoCtl_Reg = packed record
Reg_BX : DWord;
Reg_DX : DWord;
Reg_CX : DWord;
Reg_AX : DWord;
Reg_DI : DWord;
Reg_SI : DWord;
Reg_Flags : DWord;
end;

TParamBlock = packed record
PB_Operation : Byte;
PB_NumLocks : Byte;
end;

const
VWin32_DIOC_DOS_IoCtl = 1; // interrupt 21h

function DriveCharToNum(Drivechar : Char) : Word;
begin
DriveChar:=Upcase(DriveChar);
Result:= Ord(DriveChar)-Ord('A')+1;
end;

function AccessDevice(Var Reg : TDevIoCtl_Reg) : Integer;
var
DevIoHandle : THandle;
BytesReturned : DWord;
Res : Boolean;
begin
Result:=-1;
Reg.Reg_Flags:=$0001;
DevIoHandle :=
CreateFile('\\.\vwin32',0,0,nil,0,File_Flag_Delete_On_Close,0);
if DevIoHandle <> Invalid_Handle_Value then begin
Res :=
DeviceIoControl(DevIoHandle,VWin32_DIOC_DOS_IoCtl,@Reg,SizeOf(Reg),@Reg,SizeOf(Reg),BytesReturned,nil); if (Res and ((Reg.Reg_Flags and $0001) = 0)) Then Result:=0
else Result:=Reg.Reg_AX;
CloseHandle(DevIoHandle);
end;
end;

function DriveEject(DriveChar : Char) : Integer;
Var
Reg : TDevIoCtl_Reg;
begin
with Reg do begin
Reg_AX := $440d;
Reg_CX := $0849;
Reg_BX := DriveCharToNum(Drivechar);
Reg_Flags := $0001;
end;
Result:=AccessDevice(Reg);
end;

function DriveLock(DriveChar : Char) : Integer;
Var
Reg : TDevIoCtl_Reg;
Param : TParamBlock;
begin
With Param DO begin
PB_Operation:=0;
PB_NumLocks :=0;
end;
with Reg do begin
Reg_AX := $440d;
Reg_BX := DriveCharToNum(Drivechar);
Reg_CX := $0848;
Reg_DX := Integer(@Param);
end;
Result:=AccessDevice(Reg);
end;
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Romi KuntsmanCommented:
I tried this code, but i couldn't unlock my drive without using 'DriveEject' which ofcourse ejected my drive... :-(
So what about unlocking the CDROM drive?! (without ejecting it!!!)
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nytAuthor Commented:
Maybe different versions of Delphi would have different results.  However, it works fine for my D2.
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Romi KuntsmanCommented:
What works?! The answer doesn't contain a 'DriveUnlock' function!
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