Won't I get a windows delay when I use this method?

Anyway, I tried adding this

switch (message)
{
case WM_DESTROY: PostQuitMesssage(0); return 0;
case WM_KEYDOWN: if (wParam == VK_ESCAPE) { MessageBox(NULL, "Button Pressed!", NULL, NULL); } break;
}

into the message loop, but nothing happend :/

Also, how can you reach the pKeyState and the OnKeyDown method from inside the msgProc?

Why anyone chooses to use the ugliness that Win32 is in the first place is beyond me.

Can you post the complete code you used that didn't work?

There's actually not any problem that doesn't work, the problem is that I'm stuck on how to proceed. Would you mind taking a look at my whole project and maybe suggest a solution? For example, the player class needs to be able to check if the arrow keys is pressed. I've tried attaching my project to this reply, but if it didn't work, you can get my project here: http://www.megaupload.com/?d=TK74MXXG


@Vortez: Thanks for you reply too. I don't know what I should say though as it sounds pretty complicated ;) I'm just searching for the "correct" and easiest way

<removed post cause i realized i was posting completely off-topic>

Ok, thank you everyone for the help. This is however very much information for me as I'am a begginer in this area, so I'll try to break it down to one peice at a time.

Does this article help any?

Thanks very much for that article. I read it and it helped me getting a better understanding, however it was also a lot of complex things that I didn't quite understand. I tried downloading the demo you provided in the article, but that was too advanced for me

My plan was to create a class that can check all buttons on the keyboard, and then by a function check if a specific key was pressed. I know however that it's easier said then done.

This is how far I've got so far, Input.cpp:
[source lang="cpp"]
#include <Windows.h>
#include "Input.h"
#include "Main.h"


Input::Input()
{
RAWINPUTDEVICE rid[1];

rid[0].usUsagePage = 1;
rid[0].usUsage = 6;
rid[0].dwFlags = 0;
rid[0].hwndTarget = NULL;

RegisterRawInputDevices(rid, 1, sizeof(RAWINPUTDEVICE));
}


Input::~Input(void)
{
}


void Input::CheckInput(LPARAM lParam)
{
UINT bufferSize;
GetRawInputData((HRAWINPUT)lParam, RID_INPUT, NULL, &bufferSize, sizeof (RAWINPUTHEADER));
BYTE* buffer=new BYTE[bufferSize];
GetRawInputData((HRAWINPUT)lParam, RID_INPUT, (LPVOID)buffer, &bufferSize, sizeof (RAWINPUTHEADER));

RAWINPUT* raw = (RAWINPUT*) buffer;
if (raw->header.dwType == RIM_TYPEKEYBOARD)
{
USHORT keyCode = raw->data.keyboard.VKey;

switch (keyCode)
{
case VK_LEFT: MessageBox(NULL, L"Left", NULL, NULL); break;
case VK_RIGHT: MessageBox(NULL, L"Right", NULL, NULL); break;
case VK_UP: MessageBox(NULL, L"Up", NULL, NULL); break;
case VK_DOWN: MessageBox(NULL, L"Down", NULL, NULL); break;
}
}
}
[/source]

And in Main.cpp, the WinProc method:
[source lang="cpp"]
#include <Windows.h>
#include "Main.h"
#include "Graphics.h"
#include "Input.h"
#include "Player.h"


Input* input = new Input();


LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_DESTROY: PostQuitMessage(0); return 0;
}

input->CheckInput(lParam);

return DefWindowProc(hWnd, message, wParam, lParam);
}


int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wc;
ZeroMemory(&wc, sizeof(WNDCLASSEX));

wc.cbSize = sizeof(WNDCLASSEX);
wc.hInstance = hInstance;
wc.lpfnWndProc = WindowProc;
wc.lpszClassName = L"AvoidBallClass";
wc.style = CS_VREDRAW | CS_HREDRAW;

RegisterClassEx(&wc);

HWND hWnd;
hWnd = CreateWindowEx(NULL, L"AvoidBallClass", L"AvoidBall", WS_OVERLAPPED, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, NULL, NULL, hInstance, NULL);
ShowWindow(hWnd, nCmdShow);

MSG msg;

Graphics* graphics = new Graphics(hWnd);
Player* player = new Player(*graphics, 100, 100);

while (true)
{
while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}

graphics->Begin();
graphics->Draw(*player->sprite, player->x, player->y);
graphics->End();
}

// TODO: Clean up resources.

return msg.wParam;
}
[/source]

This however doesn't work. When I compile I get a direct build crash:

Unhandled exception at 0x009c15a0 in AvoidBall.exe: 0xC0000005: Access violation reading location 0x00000000.

Which points on this line in my Graphics.cpp!

d3ddev->CreateVertexBuffer(4*sizeof(CUSTOMVERTEX), 0, CUSTOMFVF, D3DPOOL_MANAGED, &v_buffer, NULL);

This makes no sence for me When I comment the content in the GetInput method, the game builds fine, but when I enable the code, it crashes.

1. What's wrong with the code?
2. Does this seem to be a "correct" way to check input?