/// <summary>
/// Restores the DVD playback state from a formerly saved resume state.
/// </summary>
/// <param name="resumeData">The resume data which was retrieved by calling <see cref="GetResumeState"/>.</param>
private void SetResumeState(byte[] resumeData)
{
if ((resumeData != null) && (resumeData.Length > 0))
{
IDvdState dvdState;
int hr = _dvdInfo.GetState(out dvdState);
if (hr < 0)
{
return;
}
IPersistMemory dvdStatePersistMemory = (IPersistMemory)dvdState;
IntPtr stateData = Marshal.AllocHGlobal(resumeData.Length);
Marshal.Copy(resumeData, 0, stateData, resumeData.Length);
try
{
dvdStatePersistMemory.Load(stateData, (uint)resumeData.Length);
}
finally
{
Marshal.FreeHGlobal(stateData);
}
hr = _dvdCtrl.SetState(dvdState, DvdCmdFlags.Block, out _cmdOption);
if (hr == 0)
{
return;
}
Marshal.ReleaseComObject(dvdState);
}
return;
}
/// <summary>
/// Gets the current DVD playback state as byte array. The resume state can be set later by calling
/// <see cref="SetResumeState"/> with the returned byte array.
/// </summary>
/// <param name="resumeData">The resume data.</param>
/// <returns><c>true</c>, if the resume state could successfully retrieved. In that case <paramref name="resumeData"/>
/// contains the resume data. <c>false</c>, if the resume state could not be retrieved. In that case,
/// <paramref name="resumeData"/> is <c>null</c>.</returns>
private bool GetResumeState(out byte[] resumeData)
{
byte[] result = null;
try
{
IDvdState dvdState;
int hr = _dvdInfo.GetState(out dvdState);
if (hr != 0)
{
return(false);
}
IPersistMemory dvdStatePersistMemory = (IPersistMemory)dvdState;
if (dvdStatePersistMemory == null)
{
Marshal.ReleaseComObject(dvdState);
return(false);
}
uint resumeSize;
dvdStatePersistMemory.GetSizeMax(out resumeSize);
if (resumeSize <= 0)
{
Marshal.ReleaseComObject(dvdStatePersistMemory);
Marshal.ReleaseComObject(dvdState);
return(false);
}
IntPtr stateData = Marshal.AllocCoTaskMem((int)resumeSize);
try
{
dvdStatePersistMemory.Save(stateData, true, resumeSize);
result = new byte[resumeSize];
Marshal.Copy(stateData, result, 0, (int)resumeSize);
}
catch
{
return(false);
}
Marshal.FreeCoTaskMem(stateData);
Marshal.ReleaseComObject(dvdStatePersistMemory);
Marshal.ReleaseComObject(dvdState);
}
catch
{
return(false);
}
finally
{
resumeData = result;
}
return(true);
}