Direct Input problem

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:

PHP Code:

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#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;
} 


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

Thanks for your help.

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

Code:

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

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