[Csgl-users] glReadPixels problem

[Christopher H. <Chr...@vi...>]

Hi,

I'm really stuck on (probably) a very simple problem. I need to read my
buffer so that I can pass it on to a special TV broadcast graphics card
that will output the graphics on the fly. I want to use the glReadPixels
command to save my buffer into a System.IntPtr object. So I use the
following code (vb.net):

'----------------------

Dim buf As Int32 =3D 0
Dim pbuf As New IntPtr(buf)

glReadPixels(0, 0, 720, 576, GL_RGBA, GL_UNSIGNED_BYTE, pbuf)

'----------------------

When it gets to glReadPixels I get a nullpointer exception. Now please
don't refer me to the FAQ, because I have read it and I read about your
workaround for passing a *void by using CSGL.Pointers.Ptypes. The
problem is that vb.net will not just let me pass something like a
PUInt32 to glReadPixels and I can't use Ctype() to convert it either.
I'm sure the solution is very simple, but I just need somebody to show
me the line of vb.net code that will do the trick. Any help greatly
appreciated!

Regards,

Chris