[RESOLVED] Reading/Writing protected memory - no idea how to debug

I've made a screen capture program, and I have a program to play back the captured clips (right now there's no sound). All of the data is stored like so:

Frames per second, as a Byte
Width of each bitmap, as an Integer
Height of each bitmap, as an Integer
All of the bitmaps' data (24 bits per pixel)

In the playback form, I have a function to read the next bitmap from the file, using the stored width and height:

vb.net Code:

Private Sub LoadNextBitmap()
        Try
            If m_Deserializer.PeekChar() = -1 Then Exit Sub
        Catch ex As Exception
 
        End Try
        m_CurBitmap = New Bitmap(w, h, PixelFormat.Format24bppRgb)
        Dim bpbmp As Integer = w * h * 3
        Dim bdata As BitmapData = m_CurBitmap.LockBits(New Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb)
        ' ^ I've also tried ImageLockMode.ReadOnly, no success.
        Dim b(bpbmp - 1) As Integer
        For i As Integer = 0 To bpbmp - 1
            b(i) = m_Deserializer.ReadByte()
        Next
        Marshal.Copy(b, 0, bdata.Scan0, bpbmp) '<-- error here
        m_CurBitmap.UnlockBits(bdata)
    End Sub

I get an error on the Marshal.Copy line: "AccessViolation exception was unhandled: Attempted to read or write protected memory. This is often an indication that other memory is corrupt." I suppose that this means that I'm writing too much data to the area in memory specified by the pointer, but I don't see how. The b() array seems to be in working order. Can anyone help? The file saves just fine.

I've tried all sorts of numbers instead of bpbmp, some of them give a strange and colorful result (ones that are quite a bit less than bpbmp). So I know the data isn't corrupted.

Oops... :P

Accidentally declared the array as Integer() instead of Byte(). Never mind!