Dynamically grabbing Effect variables?

If you access it via the ID3DXEffect interface then you've got access to that sort of information. The D3DX loader/compiler will do the appropriate parsing for you - exposing the information through various Get**() calls (note that you need to check ID3DXBaseEffect's documentation for the full list).

hth
Jack

I didn't think to check the C++ documentation (I'm using C#, which for some reason has poorly documented equivalents). But it still looks like I need to have a handle to the variable beforehand, either through knowing the variable's name or position in the file. But what if I don't know the structure of the file beforehand (i.e., I have no idea what variables exist beforehand)? Is there a way I can get a list of the variable names or even the number of variables in the file?