🚀 go-pugleaf

Hi,
I am trying to lock drives and folders on a Win98 machine.
I have two questions:

1.  The computer has three logical volume (C:, D: and E:).
    Volume E: is completely empty.
    I can lock Floppy Drive (A:), CD-ROM Drives(F: and G:) , and Drive E:
    using Level 0 lock, but can not C: and D:

   Borland Help says:
   The level 0 lock cannot be obtained on volumes that have any open files
or handles.
   Because the system always has open files, an application cannot take a
level 0 lock
   on the drive that contains the Windows 95 system files. The locking
hierarchy can be
   used on volumes with open files and handles.
   Any tip or sample code for Level1, Level2 and Level3 locking hierarcyy
please?

#define VWIN32_DIOC_DOS_IOCTL 1

typedef struct DIOCRegs {
    DWORD reg_EBX;
    DWORD reg_EDX;
    DWORD reg_ECX;
    DWORD reg_EAX;
    DWORD reg_EDI;
    DWORD reg_ESI;
    DWORD reg_Flags;
} DIOC_REGISTERS;

BOOL LockDrive(int DriveNum, int LockLevel);
BOOL UnlockDrive(int DriveNum);
HANDLE hDevice;
//--------------------------------------------------------------------------
-
void __fastcall TForm1::Button1Click(TObject *Sender)
{
  bool d1 = LockDrive(3, 0); // Drive D: My second Logical Disk

  if (d1) ListBox1->Items->Add ("Lock operation successfull!");
  else ListBox1->Items->Add ("Lock operation failed!");
}
//-------------------------------------------------------------------------
void __fastcall TForm1::Button2Click(TObject *Sender)
{
  bool d1 = UnlockDrive(3); // // Drive D: My second Logical Disk

  if (d1) ListBox1->Items->Add ("Unlock operation successfull!");
  else ListBox1->Items->Add ("Unlock operation failed!");
}
//--------------------------------------------------------------------------
-
void __fastcall TForm1::FormClose(TObject *Sender, TCloseAction &Action)
{
  CloseHandle (hDevice);
}
//--------------------------------------------------------------------------
-
BOOL LockDrive (int DriveNum, int LockLevel)
{
  BOOL fResult;
  DIOC_REGISTERS regs;
  BYTE bDeviceCat = 0x08;
  DWORD cb;

  regs.reg_Flags = 0x0001;

  hDevice = CreateFile("\\\\.\\vwin32", 0, 0, (LPSECURITY_ATTRIBUTES) NULL,
0,
                        FILE_FLAG_DELETE_ON_CLOSE, (HANDLE) NULL);

  if (hDevice == (HANDLE) INVALID_HANDLE_VALUE) return FALSE;

  regs.reg_EAX = 0x440D;
  regs.reg_EBX = MAKEWORD(DriveNum, LockLevel);
  regs.reg_ECX = MAKEWORD(0x4A, bDeviceCat);
  regs.reg_EDX = 0;

  fResult = DeviceIoControl (hDevice, VWIN32_DIOC_DOS_IOCTL, &regs,
                             sizeof(regs), &regs, sizeof(regs), &cb, 0);

  if (!fResult || (regs.reg_Flags & 0x0001)) return FALSE;
  else return TRUE;
}
//--------------------------------------------------------------------------
BOOL UnlockDrive (int DriveNum)
{
  BOOL fResult;
  DIOC_REGISTERS regs;
  BYTE bDeviceCat = 0x08;
  DWORD cb;

  regs.reg_Flags = 0x0001;

  regs.reg_EAX = 0x440D;
  regs.reg_EBX = DriveNum;
  regs.reg_ECX = MAKEWORD(0x6A, bDeviceCat);

  fResult = DeviceIoControl (hDevice, VWIN32_DIOC_DOS_IOCTL, &regs,
                             sizeof(regs), &regs, sizeof(regs), &cb, 0);

  if (!fResult || (regs.reg_Flags & 0x0001)) return FALSE;
  else return fResult;
}
//--------------------------------------------------------------------------
-

2.  I tried CreateFile and DeviceIoControl functions for locking folders,
but it failed. Any tip please?


Best regards!