What have I to use/include to call winapi /win32 functions?

[tonnot]

I want to implement a memory control for my program (I want to know how much memory that it spend)
I have a little piece of code for it (found on the web), and it use :

#include <windows.h>
#include <psapi.h>

#include <windows.h>
#include <psapi.h>

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I have errors on :

if ( !EnumProcesses( a ....
 if ( GetProcessMemoryInfo( hProc

if ( !EnumProcesses( a ....
 if ( GetProcessMemoryInfo( hProc

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Am I forgetting something ?
Thanks