DwmApi function doesn't work (says undeclared)

[ViteXikora]

I want to use this function:
HRESULT DwmGetColorizationColor(DWORD* pcrColorization, BOOL* pfOpaqueBlend)
it should be in the dwmapi.h

my use:

#include <dwmapi.h>
DWORD color = 0;
BOOL opaque = FALSE;
HRESULT hr;

hr = DwmGetColorizationColor(&color, &opaque);
if (SUCCEEDED(hr))
{
  cout << "Color: " << color;
} else {
  cout << "failed";
}

but compiler output is:

27 45 C:\Progs\C++\win8tcc.cpp [Error] 'DwmGetColorizationColor' was not declared in this scope

documentation to the function is here:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa969513%28v=vs.85%29.aspx

[Aceix]

#include <windows.h> too and let's see.

HTH,
Aceix.

[ViteXikora]

already done, all headers are
#include <windows.h>
#include <cstdlib>
#include <iostream>
#include <stdio.h>
#include <time.h>
#include <math.h>
#include <shellapi.h>
#include <dwmapi.h>
#include <winreg.h>

I use more of them although i dont need them all