has exited with code 0 (0x0)

// 14.cpp : Defines the entry point for the application.
//

#include "stdafx.h"

#include "d3dx9.h"
#include "d3d9.h"
#include <d3dx9math.h>

#define D3DFVF_CUSTOMVERTEX ( D3DFVF_XYZRHW| D3DFVF_DIFFUSE )

IDirect3D9 *D3dObject;
IDirect3DDevice9* D3dDevice;
    LPDIRECT3DVERTEXBUFFER9 Buff=NULL;

VOID * p;

struct CUSTOMVERTEX
{
    float X,Y,Z , rwh;
    DWORD color;
};

CUSTOMVERTEX Tre[]=
{
    {20.0f,20.0f,20.5f,0x1AAAAfff},
    {60.0f,20.0f,20.5f,0x1AAAAfff},
    {40.0f,50.5f,20.5f,0x1AAAAfff},
};

LRESULT __stdcall MainWindowProc
    (
        HWND hwnd,
        UINT msg,
        WPARAM wParam,
        LPARAM lParam
    );

void DrawWindowArea(HWND hwnd);

int __stdcall WinMain
    (
        HINSTANCE instance,
        HINSTANCE previousInstance,
        LPSTR commandLine,
        int commandShow
    )
{
    WNDCLASS wc;
    ZeroMemory(&wc, sizeof(wc));

    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.hInstance = instance;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.lpszClassName = "mywndclass";
    wc.lpfnWndProc = MainWindowProc;

    if( !RegisterClass(&wc) )
        return 0;  

    HWND AppWnd = CreateWindow
        (
            "mywndclass",
            "d3d test",
            WS_OVERLAPPEDWINDOW,
            100, 100, 450, 400,
            NULL,
            NULL,
            instance,
            NULL
        );

    if( !AppWnd )
        return 0;

    D3dObject = Direct3DCreate9(D3D_SDK_VERSION);
    if( !D3dObject )
        return 0;

    D3DPRESENT_PARAMETERS d3dpp;
    ZeroMemory( &d3dpp, sizeof(d3dpp) );
   
    d3dpp.Windowed = TRUE;
    d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;

    HRESULT res;
    res = D3dObject -> CreateDevice
                    (
                        D3DADAPTER_DEFAULT,
                        D3DDEVTYPE_HAL,
                        AppWnd,
                        D3DCREATE_HARDWARE_VERTEXPROCESSING,
                        &d3dpp,
                        &D3dDevice
                    );

    if( res != D3D_OK )
    {
        D3dObject -> Release();
        return 0;
    }

    ShowWindow(AppWnd, commandShow);
    UpdateWindow(AppWnd);

    MSG msg;   

    while( GetMessage(&msg, NULL, 0, 0) > 0 )
    {
        DispatchMessage(&msg);
    }
    Buff->Release();
    D3dDevice -> Release();
    D3dObject -> Release();

    return msg.wParam;
}

LRESULT __stdcall MainWindowProc
    (
        HWND hwnd,
        UINT msg,
        WPARAM wParam,
        LPARAM lParam
    )
{

    switch(msg)
    {
        case WM_PAINT:

            DrawWindowArea(hwnd);          
            return 0;

        case WM_DESTROY:

            PostQuitMessage(0);
            return 0;              
    }

    return DefWindowProc(hwnd, msg, wParam, lParam);
}  

void DrawWindowArea(HWND hwnd)
{

    D3dDevice ->CreateVertexBuffer(sizeof(CUSTOMVERTEX)*3,0,D3DFVF_CUSTOMVERTEX,D3DPOOL_DEFAULT,&Buff,NULL);

    void *p;
    Buff -> Lock(0, 0, &p, 0);
    CopyMemory(p, Tre, sizeof(Tre));
    Buff -> Unlock();

    D3dDevice -> Clear
                (
                    0,
                    NULL,
                    D3DCLEAR_TARGET,
                    D3DCOLOR_XRGB(255, 255, 255),
                    0,
                    0
                );

    D3dDevice ->BeginScene();
    D3dDevice ->SetStreamSource(0,Buff,0,sizeof(CUSTOMVERTEX));
    D3dDevice ->SetFVF(D3DFVF_CUSTOMVERTEX);
    D3dDevice ->DrawPrimitive(D3DPT_TRIANGLELIST,0,1);
    D3dDevice ->EndScene();
    D3dDevice -> Present(NULL, NULL, NULL, NULL);

    RECT wndRect;
    GetClientRect(hwnd, &wndRect);
    ValidateRect(hwnd, &wndRect);
}

The program 'C:\Program Files\Microsoft Visual Studio\MyProjects\Вершины v 2(4)\Debug\Окно.exe' has exited with code 0 (0x0).