Get Material Properties

Hello

I'm new in max scripting and I'm trying to get a list all the material properties of the selected object.

This is my first attempt...

for prop in (getPropNames $.material) do
(
	getProperty $.material prop
)

...but no property were listed.
So, I tried to force the parameter name:

for prop in (getPropNames $.material) do
(
	getProperty $.material "Diffuse"
)

And again, no property are listed.

I did some test to check if I wrote the values correctly:

getProperty $.material "Diffuse"

And if I put the getProperty out of the loop, it works perfectly for this specific parameter.

I checked also the loop using a print function...

for prop in (getPropNames $.material) do
(
	print prop
)

...and it seems to work well, listing all the property names.

So... where I'm wrong?
I don't understand is why the getProperty row works only out of the "for prop" loop.

Someone can help me, please?