CD/DVD raw data reading

[Lucky Luke]

Hi everyone,

i'm trying to read CD/DVD bytes, like a disk analyzer.
But when Stream() is Seek() over to 102400 offset, ReadByte() returns -1. It's problem only for CD discs.

How can i read all of the disc bytes?

Here's my code:

 

 [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        internal static extern SafeFileHandle CreateFile(string lpFileName,
            FileAccess dwDesiredAccess,
            FileShare dwShareMode,
            uint lpSecurityAttributes,
            FileMode dwCreationDisposition,
            int flagsAndAttributes,
            uint hTemplateFile);

Microsoft.Win32.SafeHandles.SafeFileHandle handle = null;
handle = CreateFile("\\\\.\\E:",
                    FileAccess.Read,
                    FileShare.Read,
                    0,
                    FileMode.Open,
                    FILE_FLAG_NO_BUFFERING | FILE_FLAG_SEQUENTIAL_SCAN,
                    0);

Stream strm= new FileStream(handle, FileAccess.Read);

strm.Seek(24608768, SeekOrigin.Begin); 

int dt=strm.ReadByte(); // here it returns -1

[TRScheel]

Does this happen on all CDs? Or just this one?

ReadByte() will return -1 if you are the end of the stream, granted 102400 is 102 Kb so WAY lower than what can fit on a CD.

I would try:
A) Checking Stream.CanSeek
and
B) Stream.Length to check the length of the stream