C / C++ / MFC

CBrush Red;
     Red.CreateSolidBrush(RGB(255,0x00,0x00)); //solid Red brush
     CBrush* savebrush = dc->SelectObject(&Red);

    dc->BeginPath();
    dc->Ellipse(11*Xunit,10*Yunit,16*Xunit,16*Yunit);
    dc->Ellipse(14*Xunit,10*Yunit,19*Xunit,16*Yunit);
    dc->MoveTo(8*Xunit,14*Yunit);
    dc->LineTo(15*Xunit,20*Yunit);
    dc->LineTo(22*Xunit,14*Yunit);
    dc->EndPath();
    dc->FillPath();

Hi!

I tried to eject media from my CD-ROM drive ( Z: ) in an MFC program by using Interrupt 21h. But when I run the program, I get an exception in KRNL386.EXE at 0001:00008614 and the program crashes. While bx was 001Ah before the crash as it should be, the "crashing dialog" tells me it is 898Dh after the crash. So what did I do wrong?

void CEjectDlg::OnEject() 
{
  WORD DriveNum	 = 26; // Z:
  BYTE DeviceCat = 0x08;

  __asm
  {
    mov ax, 440Dh
    mov bx, DriveNum
    mov ch, DeviceCat
    mov cl, 49h
    int 21h
  }
}

Another thing: is there a way to close the drive again by using Interrupt 21h?

Thanks,

Martin