こんばんは
今、WNDCLASSEXから作ったwcexをRegisterClassExしているのですが、何度やっても失敗します。以下の３つのファイルからなっています。

WinMain.cpp

C++
1#include<windows.h>
2#include"D3DAPP.h"
3
4class testApp :public d3DApp {
5public:
6	//Constructor
7	testApp(HINSTANCE hInstance);
8	//Destructor
9	~testApp();
10
11	//Methods
12
13	bool init() override;
14	void update(float dt) override;
15	void render() override;
16}; 
17
18testApp::testApp(HINSTANCE hInstance) :d3DApp(hInstance) {
19
20}
21
22testApp::~testApp() {
23
24}
25
26bool testApp::init() {
27	if (!d3DApp::init()) {
28		return false;
29	}
30
31	return true;
32}
33
34void testApp::update(float dt) {
35
36}
37
38void testApp::render() {
39
40}
41
42int WINAPI WinMain(
43	HINSTANCE hInstance,
44	HINSTANCE hPrevInstance,
45	LPSTR lpCmdLine,
46	int nCmdShow) {
47
48	testApp* tApp = new testApp(hInstance);
49
50	if (!tApp->init()) {
51		return 1;
52	}
53
54	return tApp->run();
55
56}

D3DApp.h

C++
1#include<windows.h>
2#include<d3d9.h>
3#include<d3dx9.h>
4
5class d3DApp {
6public:
7	//Constructor
8	d3DApp(HINSTANCE hInstance);
9
10	//destructor
11	virtual ~d3DApp();
12
13	//Main application loop
14	int run();
15
16	//Framework methods
17	virtual bool init();
18	virtual void update(float dt) = 0;
19	virtual void render() = 0;
20	LRESULT msgProc(HWND hwnd, UINT msg, WPARAM aParam, LPARAM lParam);
21
22protected:
23	//Attributes
24	HWND         m_hAppWindow;
25	HINSTANCE    m_hAppInstance;
26	unsigned int m_uiClientWidth;
27	unsigned int m_uiClientHeight;
28	LPCWSTR  m_sAppTitle;
29	DWORD        m_WindowStyle;
30
31	//methods
32
33	//Initialize the app window
34	bool initWindow();
35
36	//Initialize Direct3D
37	bool initDirect3D();
38};
39

D3DApp.cpp

C++
1#include"D3DApp.h"
2
3namespace {
4	//Create a global pointer to d3DApp
5	d3DApp* g_pd3DApp;
6}
7
8LRESULT CALLBACK MainWndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
9	//Foward the messages
10	return g_pd3DApp->msgProc(hwnd, msg, wParam, lParam);
11}
12
13d3DApp::d3DApp(HINSTANCE hInstance) {
14	m_hAppWindow = NULL;
15	m_hAppInstance = hInstance;
16	m_uiClientWidth = 800;
17	m_uiClientHeight = 600;
18	m_sAppTitle = (LPCWSTR)TEXT("DIRECTX9 App");
19	m_WindowStyle = WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX;
20}
21
22d3DApp::~d3DApp() {
23	//Release object from memory
24}
25
26int d3DApp::run() {
27	//Main message loop
28	MSG msg = { 0 };
29	while (WM_QUIT != msg.message) {
30		if (PeekMessage(&msg, NULL, NULL, NULL, PM_REMOVE)) {
31			TranslateMessage(&msg);
32			DispatchMessage(&msg);
33		} else {
34			//Update
35			update(0.0f);
36			//Render
37			render();
38		}
39	}
40
41	return static_cast<int>(msg.wParam);
42
43}
44
45bool d3DApp::init() {
46	//Check window creation
47	if (!initWindow()) {
48		return false;
49	}
50
51	//Check Direct3D initilization
52	if (!initDirect3D()) {
53		return false;
54	}
55
56	return true;
57}
58
59bool d3DApp::initWindow() {
60	//Create WNDCLASS
61	WNDCLASSEX wcex;
62	static LPCWSTR classNameLPCWSTR = (LPCWSTR)TEXT("D3DAPPWNDCLASS");
63	ZeroMemory(&wcex, sizeof(WNDCLASSEX));
64	wcex.cbClsExtra = 0;
65	wcex.cbWndExtra = 0;
66	wcex.cbSize = sizeof(WNDCLASS);
67	wcex.style = CS_HREDRAW | CS_VREDRAW;
68	wcex.hInstance = m_hAppInstance;
69	wcex.lpfnWndProc = MainWndProc;
70	wcex.hIcon = LoadIcon(NULL, IDI_APPLICATION);
71	wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
72	wcex.hbrBackground = (HBRUSH)GetStockObject(NULL_BRUSH);
73	wcex.lpszMenuName = NULL;
74	wcex.lpszClassName = classNameLPCWSTR;
75	wcex.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
76
77	//Register that class
78	if (!RegisterClassEx(&wcex)) {
79		MessageBox(NULL, (LPCWSTR)TEXT("Failed to register window class"), NULL, NULL);
80		return false;
81	}
82
83	//Cache requested width, height
84	RECT r = { 0,0,m_uiClientWidth,m_uiClientHeight };
85	AdjustWindowRect(&r, m_WindowStyle, false);
86	int width = r.right - r.left;
87	int height = r.top - r.bottom;
88
89	//Create the window
90	m_hAppWindow = CreateWindow(
91		(LPCWSTR)TEXT("D3DAPPWNDCLASS"),
92		m_sAppTitle,
93		m_WindowStyle,
94		GetSystemMetrics(SM_CXSCREEN) / 2 - width / 2,
95		GetSystemMetrics(SM_CYSCREEN) / 2 - height / 2,
96		width,
97		height,
98		NULL,
99		NULL,
100		m_hAppInstance,
101		NULL);
102
103	//Check if window was created
104	if (!m_hAppWindow) {
105		MessageBox(NULL, (LPCWSTR)TEXT("Failed to create window"), NULL, NULL);
106		return false;
107	}
108
109	//Show the window
110	ShowWindow(m_hAppWindow, SW_SHOW);
111
112	return true;
113}
114
115bool d3DApp::initDirect3D() {
116	return true;
117}
118
119LRESULT d3DApp::msgProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
120	switch (msg) {
121	case WM_DESTROY:
122		PostQuitMessage(0);
123		return 0;
124	}
125
126	return DefWindowProc(hwnd, msg, wParam, lParam);
127}