Direct Input problem

[Khavoerm]

Hello,
While following a direct input tutorial, I got this error :
error LNK2001: unresolved external symbol _GUID_SysMouse
I have link to dinput.lib, and here's my code:

#include <dinput.h>
#include <windows.h>

LPDIRECTINPUT lpdi;
LPDIRECTINPUTDEVICE lpdiKeyboard, lpdiMouse;

LRESULT CALLBACK WndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
    switch(Msg)
    {
    case WM_CLOSE:
        {
            DestroyWindow(hWnd);
        }
        break;
    case WM_DESTROY:
        {
            PostQuitMessage(0);
        }
        break;
    default:
        return DefWindowProc(hWnd,Msg,wParam,lParam);
    }
    return 0;
}

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
     WNDCLASSEX wc;

    wc.cbClsExtra = 0;
    wc.cbSize = sizeof(wc);
    wc.cbWndExtra = 0;
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW);
    wc.hCursor = LoadCursor(NULL,IDC_ARROW);
    wc.hIcon = wc.hIconSm = LoadIcon(NULL,IDI_APPLICATION);
    wc.hInstance = hInstance;
    wc.lpfnWndProc = WndProc;
    wc.lpszClassName = "DInput";
    wc.lpszMenuName = NULL;
    wc.style = 0;

    RegisterClassEx(&wc);
    
    HWND hWnd = CreateWindowEx(NULL,"DInput","DInput",WS_OVERLAPPEDWINDOW,0,0,800,700,NULL,NULL,hInstance,NULL);

    ShowWindow(hWnd,nCmdShow);
    UpdateWindow(hWnd);

    DirectInputCreate(hInstance,DIRECTINPUT_VERSION,&lpdi,NULL);
    lpdi->CreateDevice(GUID_SysKeyboard,&lpdiKeyboard,NULL);
    lpdi->CreateDevice(GUID_SysMouse,&lpdiMouse,NULL);

    MSG Msg;

    while(GetMessage(&Msg,NULL,0,0))
    {
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
    }

    return 0;
} 

Someone know why I get this error (I get the same error for the Keyboard)

Thanks for your help.

[CornedBee]

You need to define something before including dinput.h. something like INITGUID (look it up in DirectX SDK help):

#define INITGUID
#include <windows.h> // should be always included first
#include <dinput.h>

If you have several files, you should define this only ONCE.