public virtual long CopyTo(InteropValues.IStream pstm, long cb, long[] pcbRead)
{
const int bufsize = 4096;
var buffer = Marshal.AllocHGlobal(bufsize);
if (buffer == IntPtr.Zero)
{
throw new OutOfMemoryException();
}
long written = 0;
try
{
while (written < cb)
{
var toRead = bufsize;
if (written + toRead > cb)
{
toRead = (int)(cb - written);
}
var read = Read(buffer, toRead);
if (read == 0)
{
break;
}
if (pstm.Write(buffer, read) != read)
{
throw EFail("Wrote an incorrect number of bytes");
}
written += read;
}
}
finally
{
Marshal.FreeHGlobal(buffer);
}
if (pcbRead != null && pcbRead.Length > 0)
{
pcbRead[0] = written;
}
return(written);
}
internal static extern int GdipSaveImageToStream(HandleRef image, InteropValues.IStream stream, ref Guid classId, HandleRef encoderParams);
internal static extern int GdipCreateBitmapFromStream(InteropValues.IStream stream, out IntPtr bitmap);
