ctypes: using .value or .value() doesn't work for c_long

[IronManMark20]

I am using ctypes to call a few windll funcions. One of them returns a c_long object. I want to know what number the function returns. 

Problem is, when I try foo.value , it gives me this:

AttributeError: LP_c_long object has no attribute value.

Any idea of what could cause this?