Question about release IFileSystemImage

Question

I'm using IFileSystemImage to do some data burning, and I can't release FSI object after CreateResultImage. The files on the hard disk can't be delete...

if blank CD, occasionally I can delete files after burn,

if non-blank CD, I can never delete files after burn.

1.First, I use SHCreateStreamOnFile to create IStream, and add it to  FSI.root.

Code Snippet

            try
            {
                Win32.SHCreateStreamOnFile(filePath, Win32.STGM_READ | Win32.STGM_SHARE_DENY_WRITE, ref stream);

                if (stream != null)
                {
                    rootItem.AddFile(displayName, stream);
                    return true;
                }
            }
            catch (Exception ex)
            {
            }
            finally
            {
                if (stream != null)
                {
                    int iReturn = Marshal.FinalReleaseComObject(stream);
                }
            }

2.Second, CreateFsisystem

Code Snippet

            MsftFileSystemImage fileSystemImage = null;
            IFileSystemImageResult fileSystemImageResult = null;
            IFsiDirectoryItem rootItem = null;
            try
            {
                fileSystemImage = new MsftFileSystemImage();
                fileSystemImage.ChooseImageDefaults(discRecorder);
                fileSystemImage.FileSystemsToCreate =
                  FsiFileSystems.FsiFileSystemJoliet | FsiFileSystems.FsiFileSystemISO9660;
                fileSystemImage.VolumeName = m_BurnData.ClientName;

                fileSystemImage.Update += fileSystemImage_Update;
                if (multisessionInterfaces != null)
                {
                    fileSystemImage.MultisessionInterfaces = multisessionInterfaces;
                    FsiFileSystems fsi = fileSystemImage.ImportFileSystem();
                    fsi = fileSystemImage.IdentifyFileSystemsOnDisc(discRecorder);
                }

                rootItem = fileSystemImage.Root;

                foreach (IMediaItem mediaItem in m_ListItems)
                {
                    if (backgroundBurnWorker.CancellationPending)
                    {
                        break;
                    }

                    mediaItem.AddToFileSystem(ref rootItem);
                }

                fileSystemImage.Update -= fileSystemImage_Update;

                if (backgroundBurnWorker.CancellationPending)
                {
                    dataStream = null;
                    return false;
                }

                fileSystemImageResult = fileSystemImage.CreateResultImage();
                dataStream = fileSystemImageResult.ImageStream;
            }
            catch (COMException exception)
            {
            }
            finally
            {
                if (rootItem != null)
                {
                    Marshal.FinalReleaseComObject(rootItem);
                }
                if (fileSystemImageResult != null)
                {
                    Marshal.FinalReleaseComObject(fileSystemImageResult);
                }
                if (fileSystemImage != null)
                {
                    Marshal.FinalReleaseComObject(fileSystemImage);
                }
            }

3.After discFormatData.Write(dataStream)

Code Snippet

 Marshal.FinalReleaseComObject(dataStream);

Marshal.FinalReleaseComObject(discRecorder);

Marshal.FinalReleaseComObject(discFormatData);

Answer 1

Hi Susie,

You'll need to narrow down the issue: try to do the same things:
without event subscribing,
without event subscribing & burning,
without event subscribing & burning & image creation,
etc.

Once you get the point, which causes the problem, it should be easy to fix the issue.

With Regards,
Mikhail

Answer 2

Closing due to no response.  If the user comes back with more information, we can reopen.

 

Best Regards,

Windows Optical Team

Answer 3

Hi Mikhail,

I'm sorry for being late, about this question I modified someplaces. Now,Only when the disk is rewriteable, and is non-blank, I can't delete files after burn.

Except format the rewiteable disc before burn, is there any other solution?

Best Regards,

Susie

Answer 4

After Burn I release these com object.

code snippet

                if (discRecorder != null)
                {
                    Marshal.FinalReleaseComObject(discRecorder);
                    discRecorder = null;
                }

                if (discFormatData != null)
                {

                    if (discFormatData.Recorder != null)
                    {
                        Marshal.FinalReleaseComObject(discFormatData.Recorder);
                        discFormatData.Recorder = null;
                    }

                    Marshal.FinalReleaseComObject(discFormatData);
                    discFormatData = null;
                }
                if (fileSystem != null)
                {
                    Marshal.FinalReleaseComObject(fileSystem);
                    fileSystem = null;
                }

When the disc is rewriteable and non-blank, I can't delete files. But if I comment out the line //discFormatData.Write(fileSystem); after release com object, I can delete files. So I think when write, something is locked. Now which com object should be released?

Answer 5

I also have same problem. I am not able to delete the files on the hard disk once do a discFormat.Write(fileSystem). Anyone working on IMAPI have any idea? Strangely it locks only the first file out of the lot always! Susie did you find any solution for this?

Answer 6

Anyone ever get an answer to this, I have been beating my head all day trying to get past this issue.

I have called marshal.ReleaseComObject on the filesystem image, IStream, MsftDiscFormat2Data and nothing seems to make a difference.

 

I am desperate at this point.