problem with loading background texture

#define _CRT_SECURE_NO_DEPRECATE#include<windows.h>#include<d3d9.h>#include<d3dx9.h>#include<d3dx9tex.h>#include"resource.h"#include<dxerr9.h>#define SAFE_RELEASE(x) {if (x) x->Release(); x=NULL;}#define SAFE_DELETE(p)  {if(p) {delete (p); (p)=NULL;}}LRESULT WINAPI WndProc(HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam);void RegisterWindowClass(HINSTANCE hInstance);void CreateAppWindow(HINSTANCE hInstance);WPARAM StartMessageLoop();HRESULT InitDirect3D();bool Render();void CleanUpDirect3D();extern "C" char *  Problem  = "0 errors                    ";HWND g_hWnd;IDirect3D9* g_pDirect3D = NULL;IDirect3DDevice9* g_pDirect3DDevice = NULL;IDirect3DSurface9* g_pBitmapSurface = NULL;HRESULT g_hResult = D3D_OK;char g_szErrorMsg[256];/////////// M A I N ////////////INT WINAPI WinMain(HINSTANCE hInstance,HINSTANCE,LPSTR,INT){	RegisterWindowClass(hInstance);	CreateAppWindow(hInstance);	ShowWindow(g_hWnd,SW_SHOWDEFAULT);	UpdateWindow(g_hWnd);	HRESULT hResult = InitDirect3D();	if (SUCCEEDED(hResult))		WPARAM result = StartMessageLoop();	CleanUpDirect3D();	CloseWindow(g_hWnd);	if (g_hResult!= D3D_OK)		DXTRACE_ERR(g_szErrorMsg,g_hResult);		MessageBox(g_hWnd,Problem,"DirectX Error",MB_OK);			return 0;}///////////WndProc()//////////LRESULT WINAPI WndProc(HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam) {	switch (msg) {		case WM_KEYDOWN:			switch(wParam) {				case VK_ESCAPE:					PostQuitMessage(0);				break ;			}		case WM_CREATE:		break;			case WM_PAINT:			ValidateRect(g_hWnd,NULL);		break;		case WM_DESTROY:			PostQuitMessage(1) ;		break ;		default:			return DefWindowProc(hWnd,msg,wParam,lParam);	}return 0;}//////////RegisterWindowClass()/////////void RegisterWindowClass(HINSTANCE hInstance){	WNDCLASSEX wc;	ZeroMemory(&wc, sizeof(WNDCLASSEX));	wc.cbSize = sizeof(WNDCLASSEX);	wc.style = CS_HREDRAW|CS_VREDRAW;	wc.lpfnWndProc = WndProc;	wc.cbClsExtra = 0;	wc.cbWndExtra = 0;	wc.hInstance = hInstance;	wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);	wc.hCursor = (HCURSOR)LoadCursor(NULL,IDC_ARROW);	wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);	wc.lpszMenuName = NULL;	wc.lpszClassName = "GameEngine";	wc.hIconSm = NULL;	RegisterClassEx(&wc);}//////////CreateAppWindow()/////////void CreateAppWindow(HINSTANCE hInstance) {	g_hWnd = CreateWindowEx(		NULL,		"GameEngine", 		"GameEngine",		WS_OVERLAPPEDWINDOW,		100,		100,		500,		400,		GetDesktopWindow(),		NULL,		hInstance,		NULL);}/////////StartMessageLoop()/////////WPARAM StartMessageLoop(){	MSG msg;	while(1)	{		if (PeekMessage(&msg,NULL,0,0,PM_REMOVE)) {			if (msg.message == WM_QUIT) break;			TranslateMessage(&msg);			DispatchMessage(&msg);		}		else {			if (!Render()) PostMessage(g_hWnd, WM_DESTROY, 0, 0);		}	}	return msg.wParam;}////////InitDirect3D()/////////HRESULT InitDirect3D(){	g_pDirect3D = Direct3DCreate9(D3D_SDK_VERSION);	if(g_pDirect3D ==NULL) {		MessageBox(g_hWnd,			"Couldn't create DirectX object.",			"DirectX Error",MB_OK);		return E_FAIL;	}	HRESULT hResult = g_pDirect3D->CheckDeviceType(D3DADAPTER_DEFAULT,		D3DDEVTYPE_REF,D3DFMT_X8R8G8B8,D3DFMT_X8R8G8B8,FALSE);	if(hResult !=D3D_OK) {		MessageBox(g_hWnd,			"Sorry,this application won't run on your system",			"DirectX Error",MB_OK);		return E_FAIL;	}	D3DPRESENT_PARAMETERS D3DPresentParams;	ZeroMemory(&D3DPresentParams,sizeof(D3DPRESENT_PARAMETERS));	D3DPresentParams.Windowed = TRUE;	D3DPresentParams.BackBufferCount = 1;	D3DPresentParams.BackBufferWidth = 640;	D3DPresentParams.BackBufferHeight = 480;	D3DPresentParams.BackBufferFormat = D3DFMT_X8R8G8B8;	D3DPresentParams.SwapEffect = D3DSWAPEFFECT_DISCARD;	D3DPresentParams.hDeviceWindow = g_hWnd;	hResult = g_pDirect3D->CreateDevice(D3DADAPTER_DEFAULT,		D3DDEVTYPE_HAL,g_hWnd,D3DCREATE_SOFTWARE_VERTEXPROCESSING,		&D3DPresentParams,&g_pDirect3DDevice);	if(FAILED(hResult)) {		MessageBox(g_hWnd,"Failed to create Direct3D Device.",			"DirectX Error",MB_OK);		return E_FAIL;	}	g_hResult = g_pDirect3DDevice->CreateOffscreenPlainSurface(640,480,		D3DFMT_X8R8G8B8,D3DPOOL_DEFAULT,&g_pBitmapSurface,NULL);	if(FAILED(g_hResult)) {				Problem="Error creating bitmap surface.";		return g_hResult;	}	//make sure this bitmap is in the same directory as your source code	g_hResult = D3DXLoadSurfaceFromFile(g_pBitmapSurface,NULL,NULL,		"background.tga",NULL,D3DX_DEFAULT,0,NULL);		if(FAILED(g_hResult)) {				Problem="Couldn't load bitmap file.";		return g_hResult;			}	return D3D_OK;} //////CleanUpDirect3D()///////void CleanUpDirect3D() {	SAFE_RELEASE(g_pBitmapSurface);	SAFE_RELEASE(g_pDirect3DDevice);	SAFE_RELEASE(g_pDirect3D);		}////////Render()/////////bool Render(){	IDirect3DSurface9* pBackBuffer = NULL;	g_hResult = g_pDirect3DDevice->GetBackBuffer(0,0,D3DBACKBUFFER_TYPE_MONO,&pBackBuffer);	if(FAILED(g_hResult)) {		Problem="Error getting back buffer.";		return false;	}	g_hResult = g_pDirect3DDevice->StretchRect(g_pBitmapSurface,		NULL,pBackBuffer,NULL,D3DTEXF_NONE);	if(FAILED(g_hResult)) {		Problem="Error copying back buffer.";		return false;	}	g_pDirect3DDevice->Present(NULL,NULL,NULL,NULL);	if(pBackBuffer)		pBackBuffer->Release(); 	return true;}