How to prevent DVD eject programmatically

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My application copies files to DVD. I want to prevent DVD eject during this copy.

What I have tried:

Used DeviceIoControl( hVolume,IOCTL_STORAGE_EJECTION_CONTROL,&PMRBuffer, sizeof(PREVENT_MEDIA_REMOVAL),NULL, 0,&dwBytesReturned, NULL);

The lock works fine until the first file is copied. After copying of first file i am able to eject the DVD. I want the lock to work until all files are copied

Is this a bug in DeviceIoControl() API? Any workarounds?

Posted 5-Mar-18 17:55pm

dilsdgr8

Updated 5-Mar-18 20:28pm

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RDBurmon · Answer 1 · 2018-03-05T20:05:00

think you are missing one parameter to pass full stack of files so that writing control would no there are files to be written in the stack so it wont eject the CD as soon as first completes

however this may help to understand the function's parameters well

Call CreateFile with GENERIC_READ|GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE, and OPEN_EXISTING. The lpFileName parameter should be \.\X: (where X is the real drive letter). All other parameters can be zero.

Lock the volume by issuing the FSCTL_LOCK_VOLUME IOCTL via DeviceIoControl. If any other application or the system is using the volume, this IOCTL fails. Once this function returns successfully, the application is guaranteed that the volume is not used by anything else in the system.

Dismount the volume by issuing the FSCTL_DISMOUNT_VOLUME IOCTL. This causes the file system to remove all knowledge of the volume and to discard any internal information that it keeps regarding the volume.

Make sure the media can be removed by issuing the IOCTL_STORAGE_MEDIA_REMOVAL IOCTL. Set the PreventMediaRemoval member of the PREVENT_MEDIA_REMOVAL structure to FALSE before calling this IOCTL. This stops the device from preventing the removal of the media.

Eject the media with the IOCTL_STORAGE_EJECT_MEDIA IOCTL. If the device doesn't allow automatic ejection, then IOCTL_STORAGE_EJECT_MEDIA can be skipped and the user can be 
instructed to remove the media.

Close the volume handle obtained in the first step or issue the FSCTL_UNLOCK_VOLUME IOCTL. This allows the drive to be used by other processes.

hope your code syntax is like this -

C++

bResult = DeviceIoControl(hDevice,                       // device to be queried
                            IOCTL_DISK_GET_DRIVE_GEOMETRY, // operation to perform
                            NULL, 0,                       // no input buffer
                            pdg, sizeof(*pdg),            // output buffer
                            &junk,                         // # bytes returned
                            (LPOVERLAPPED) NULL);          // synchronous I/O\