Linker errors

  
// include files ////////////////////////////////////////////////////////////


#include <d3dx8.h>
#include <mmsystem.h>
#pragma comment( lib, "dxguid.lib" )
#pragma comment( lib, "d3d8.lib" )

//-----------------------------------------------------------------------------

// Global variables

//-----------------------------------------------------------------------------

LPDIRECT3D8             g_pD3D       = NULL; // Used to create the D3DDevice

LPDIRECT3DDEVICE8       g_pd3dDevice = NULL; // Our rendering device

LPDIRECT3DVERTEXBUFFER8 g_pVB        = NULL; // Buffer to hold vertices


// A structure for our custom vertex type

struct CUSTOMVERTEX
{
    FLOAT x, y, z;      // The untransformed, 3D position for the vertex

    DWORD color;        // The vertex color

};

// Our custom FVF, which describes our custom vertex structure

#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ|D3DFVF_DIFFUSE)




//-----------------------------------------------------------------------------

// Name: InitD3D()

// Desc: Initializes Direct3D

//-----------------------------------------------------------------------------

HRESULT InitD3D( HWND hWnd )
{
    // Create the D3D object.

    if( NULL == ( g_pD3D = Direct3DCreate8( D3D_SDK_VERSION ) ) )
        return E_FAIL;

    // Get the current desktop display mode, so we can set up a back

    // buffer of the same format

    D3DDISPLAYMODE d3ddm;
    if( FAILED( g_pD3D->GetAdapterDisplayMode( D3DADAPTER_DEFAULT, &d3ddm ) ) )
        return E_FAIL;

    // Set up the structure used to create the D3DDevice

    D3DPRESENT_PARAMETERS d3dpp;
    ZeroMemory( &d3dpp, sizeof(d3dpp) );
    d3dpp.Windowed = TRUE;
    d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
    d3dpp.BackBufferFormat = d3ddm.Format;

    // Create the D3DDevice

    if( FAILED( g_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,
                                      D3DCREATE_SOFTWARE_VERTEXPROCESSING,
                                      &d3dpp, &g_pd3dDevice ) ) )
    {
        return E_FAIL;
    }

    // Turn off culling, so we see the front and back of the triangle

    g_pd3dDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE );

    // Turn off D3D lighting, since we are providing our own vertex colors

    g_pd3dDevice->SetRenderState( D3DRS_LIGHTING, FALSE );

    return S_OK;
}




//-----------------------------------------------------------------------------

// Name: InitGeometry()

// Desc: Creates the scene geometry

//-----------------------------------------------------------------------------

HRESULT InitGeometry()
{
    // Initialize three vertices for rendering a triangle

    CUSTOMVERTEX g_Vertices[] =
    {
        { -1.0f,-1.0f, 0.0f, 0xffff0000, },
        {  1.0f,-1.0f, 0.0f, 0xff0000ff, },
        {  0.0f, 1.0f, 0.0f, 0xffffffff, },
    };

    // Create the vertex buffer.

    if( FAILED( g_pd3dDevice->CreateVertexBuffer( 3*sizeof(CUSTOMVERTEX),
                                                  0, D3DFVF_CUSTOMVERTEX,
                                                  D3DPOOL_DEFAULT, &g_pVB ) ) )
    {
        return E_FAIL;
    }

    // Fill the vertex buffer.

    VOID* pVertices;
    if( FAILED( g_pVB->Lock( 0, sizeof(g_Vertices), (BYTE**)&pVertices, 0 ) ) )
        return E_FAIL;
    memcpy( pVertices, g_Vertices, sizeof(g_Vertices) );
    g_pVB->Unlock();

    return S_OK;
}




//-----------------------------------------------------------------------------

// Name: Cleanup()

// Desc: Releases all previously initialized objects

//-----------------------------------------------------------------------------

VOID Cleanup()
{
    if( g_pVB != NULL )
        g_pVB->Release();

    if( g_pd3dDevice != NULL )
        g_pd3dDevice->Release();

    if( g_pD3D != NULL )
        g_pD3D->Release();
}



//-----------------------------------------------------------------------------

// Name: SetupMatrices()

// Desc: Sets up the world, view, and projection transform matrices.

//-----------------------------------------------------------------------------

VOID SetupMatrices()
{
    // For our world matrix, we will just rotate the object about the y-axis.

    D3DXMATRIX matWorld;
    D3DXMatrixRotationY( &matWorld, timeGetTime()/150.0f );
    g_pd3dDevice->SetTransform( D3DTS_WORLD, &matWorld );

    // Set up our view matrix. A view matrix can be defined given an eye point,

    // a point to lookat, and a direction for which way is up. Here, we set the

    // eye five units back along the z-axis and up three units, look at the

    // origin, and define "up" to be in the y-direction.

    D3DXMATRIX matView;
    D3DXMatrixLookAtLH( &matView, &D3DXVECTOR3( 0.0f, 3.0f,-5.0f ),
                                  &D3DXVECTOR3( 0.0f, 0.0f, 0.0f ),
                                  &D3DXVECTOR3( 0.0f, 1.0f, 0.0f ) );
    g_pd3dDevice->SetTransform( D3DTS_VIEW, &matView );

    // For the projection matrix, we set up a perspective transform (which

    // transforms geometry from 3D view space to 2D viewport space, with

    // a perspective divide making objects smaller in the distance). To build

    // a perpsective transform, we need the field of view (1/4 pi is common),

    // the aspect ratio, and the near and far clipping planes (which define at

    // what distances geometry should be no longer be rendered).

    D3DXMATRIX matProj;
    D3DXMatrixPerspectiveFovLH( &matProj, D3DX_PI/4, 1.0f, 1.0f, 100.0f );
    g_pd3dDevice->SetTransform( D3DTS_PROJECTION, &matProj );
}



//-----------------------------------------------------------------------------

// Name: Render()

// Desc: Draws the scene

//-----------------------------------------------------------------------------

VOID Render()
{
    // Clear the backbuffer to a black color

    g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0,0,128), 1.0f, 0 );

    // Begin the scene

    g_pd3dDevice->BeginScene();

    // Setup the world, view, and projection matrices

    SetupMatrices();

    // Render the vertex buffer contents

    g_pd3dDevice->SetStreamSource( 0, g_pVB, sizeof(CUSTOMVERTEX) );
    g_pd3dDevice->SetVertexShader( D3DFVF_CUSTOMVERTEX );
    g_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP, 0, 1 );

    // End the scene

    g_pd3dDevice->EndScene();

    // Present the backbuffer contents to the display

    g_pd3dDevice->Present( NULL, NULL, NULL, NULL );
}




//-----------------------------------------------------------------------------

// Name: MsgProc()

// Desc: The window''s message handler

//-----------------------------------------------------------------------------

LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
    switch( msg )
    {
        case WM_DESTROY:
            PostQuitMessage( 0 );
            return 0;
    }

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




//-----------------------------------------------------------------------------

// Name: WinMain()

// Desc: The application''s entry point

//-----------------------------------------------------------------------------

INT WINAPI WinMain( HINSTANCE hInst, HINSTANCE, LPSTR, INT )
{
    // Register the window class

    WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L,
                      GetModuleHandle(NULL), NULL, NULL, NULL, NULL,
                      "Ch6p2_FirstScene", NULL };
    RegisterClassEx( &wc );

    // Create the application''s window

  HWND hWnd = CreateWindowEx(0, "MyCoolWindow", "My First Window",
	    WS_POPUP | WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_CAPTION | WS_SYSMENU | WS_THICKFRAME, 
      50, 50, 200, 100, NULL, NULL, hInst, NULL);


    // Initialize Direct3D

    if( SUCCEEDED( InitD3D( hWnd ) ) )
    {
        // Create the scene geometry

        if( SUCCEEDED( InitGeometry() ) )
        {
            // Show the window

            ShowWindow( hWnd, SW_SHOWDEFAULT );
            UpdateWindow( hWnd );

            // Enter the message loop

            MSG msg;
            ZeroMemory( &msg, sizeof(msg) );
            while( msg.message!=WM_QUIT )
            {
                if( PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ) )
                {
                    TranslateMessage( &msg );
                    DispatchMessage( &msg );
                }
                else
                    Render();
            }
        }
    }

    // Clean up everything and exit the app

    Cleanup();
    return 0;
}
  

        // Register the window class

    WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L,
                      GetModuleHandle(NULL), NULL, NULL, NULL, NULL,
                      "Ch6p2_FirstScene", NULL };
    RegisterClassEx( &wc );

    // Create the application's window

  HWND hWnd = CreateWindowEx(0, "MyCoolWindow", "My First Window",
	    	    WS_POPUP | WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_CAPTION | WS_SYSMENU |
WS_THICKFRAME, 
      50, 50, 200, 100, NULL, NULL, hInst, NULL);  

The one-before-last variable in wc is "Ch6p2_FirstScene".
The second parameter in CreateWindowEx() should equal that one.

So:
          // Register the window class

    WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L,
                      GetModuleHandle(NULL), NULL, NULL, NULL, NULL,
                      "WINDOWCLASSNAME", NULL };
    RegisterClassEx( &wc );

    // Create the application's window

  HWND hWnd = CreateWindowEx(0, "WINDOWCLASSNAME", "My First Window",
	    	    WS_POPUP | WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_CAPTION | WS_SYSMENU |
WS_THICKFRAME, 
      50, 50, 200, 100, NULL, NULL, hInst, NULL);