CDR.EXE – Open/Close CD Drive(s) Programmatically

In Windows Explorer, you can right-click on a CD-Drive and select the “Eject” option to open the CD Drive. Unfortunately, there is no “Close” equivelant to Close the drive. This project builds a command-line program that lets you open or close any or all of your CD-Drives.

To display the program’s usage, run the program with no parameters:


C:\> CDR
CDR by Chris M. Sebrell
usage:
CDR [open|close] [Drive-Letter|ALL]
example:
CDR open E:
CDR close ALL
C:\>

To OPEN or CLOSE the first logical CD Drive:


C:\> CDR open
C:\> CDR close

If you have more than one CD Drive, you can specify a drive letter:


C:\> CDR open g:
C:\> CDR close g:

If you have more than one CD Drive, you can specify ALL drives:


C:\> CDR open all
C:\> CDR close all

The main work routine in the program is CD_OpenClose(BOOL bOpen, TCHAR cDrive)


//Open or Close CD Drive
//cDrive is Drive Letter to Open, or 0x01 for ‘Default’ drive
//Examples:
//CD_OpenCloseDrive(TRUE, ‘G’); //Open CD Door for Drive G:
//CD_OpenCloseDrive(FALSE, ‘G’); //Close CD Door for Drive G:
//CD_OpenCloseDrive(TRUE, 1); //Open First Logical CD Door
void CD_OpenCloseDrive(BOOL bOpenDrive, TCHAR cDrive)
{
MCI_OPEN_PARMS op;
MCI_STATUS_PARMS st;
DWORD flags;

TCHAR szDriveName[4];
strcpy(szDriveName, “X:”);

::ZeroMemory(&op, sizeof(MCI_OPEN_PARMS));
op.lpstrDeviceType = (LPCSTR) MCI_DEVTYPE_CD_AUDIO;

if(cDrive > 1)
{
szDriveName[0] = cDrive;
op.lpstrElementName = szDriveName;
flags = MCI_OPEN_TYPE
| MCI_OPEN_TYPE_ID
| MCI_OPEN_ELEMENT
| MCI_OPEN_SHAREABLE;
}
else flags = MCI_OPEN_TYPE
| MCI_OPEN_TYPE_ID
| MCI_OPEN_SHAREABLE;

if (!mciSendCommand(0,MCI_OPEN,flags,(unsigned long)&op))
{
st.dwItem = MCI_STATUS_READY;

if(bOpenDrive)
mciSendCommand(op.wDeviceID,MCI_SET,MCI_SET_DOOR_OPEN,0);
else
mciSendCommand(op.wDeviceID,MCI_SET,MCI_SET_DOOR_CLOSED,0);

mciSendCommand(op.wDeviceID,MCI_CLOSE,MCI_WAIT,0);
}
}

Next, to facilitate operating on ALL CD Drive Doors, add this routine (which calls the CD_OpenCloseDrive() function above):


void CD_OpenCloseAllDrives(BOOL bOpenDrives)
{
// Determine All CD Drives and Open (or Close) each one
int nPos = 0;
UINT nCount = 0;
TCHAR szDrive[4];
strcpy(szDrive, “?:\\”);

DWORD dwDriveList = ::GetLogicalDrives ();

while (dwDriveList) {
if (dwDriveList & 1)
{
szDrive[0] = 0x41 + nPos;
if(::GetDriveType(szDrive) == DRIVE_CDROM)
CD_OpenCloseDrive(bOpenDrives, szDrive[0]);
}
dwDriveList >>= 1;
nPos++;
}
}

That’s all! The download includes source code & the compiled CDR.EXE program. If anyone has additions, corrections, or a whole new approach to this, I’d love to hear about it. I’ll update this project with any new useful information I receive.

Downloads

Download project (Source & Executable)- 32 Kb

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