Accessing To A Struct With A Given Pointer

We have a struct defined as :

Then we are sent a message...

​

And this is the code which gets the message

​

lParam contains the address of the struct. Here we want to access to the struct.

But there is a problem with the code. pWinPos is a constant pointer, so we can't simply assign an address to it.

So, finally, here is my question...
How can I access to the WINDOWPOS struct whose address is given by lParam

PS : I am using Dev-C++

 

That one works, thank you.

Actually, I tried the same thing, but I put the * oparetor to the wrong place :
pWinPos = (* WINDOWPOS)lParam; instead of pWinPos = (WINDOWPOS *)lParam;
That is silly of me