Ошибки в примере из книги Щупака

#include <Windows.h>
 
 
class KWnd 
{ 
public: 
    KWnd(LPCTSTR windowName, HINSTANCE hInst, int cmdShow, LRESULT (WINAPI *pWndProc)(HWND, UINT, WPARAM, LPARAM),
        LPCTSTR menuName = NULL, int x = CW_USEDEFAULT, int y = 0, int width = CW_USEDEFAULT, int height = 0, UINT classStyle = CS_HREDRAW | CS_VREDRAW,  
         DWORD windowStyle = WS_OVERLAPPEDWINDOW, HWND hParent = NULL); 
 
    HWND CetHWnd() { return hWnd; } 
protected: 
    HWND hWnd; 
    WNDCLASSEX wc; 
};

#include "KWnd.h"
 
 
KWnd::KWnd(LPCTSTR windowName, HINSTANCE hInst, int cmdShow, LRESULT (WINAPI *pWndProc)(HWND,UINT, WPARAM, LPARAM), 
      LPCTSTR menuName, int x, int y, int width, int height, UINT classStyle, DWORD windowStyle, HWND hParent) 
 
{ 
    char szClassName[] = "KWndClass"; 
 
    wc.cbSize = sizeof(wc); 
    wc.style = classStyle; 
    wc.lpfnWndProc = pWndProc; 
    wc.cbClsExtra = 0; 
    wc.cbWndExtra = 0; 
    wc.hInstance = hInst; 
    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION); 
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);  
    wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wc.lpszMenuName = menuName;
    wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION); 
 
    if(!RegisterClassEx(&wc)) 
    { 
        char msg[100] = "Cannopt register class "; 
        strcat(msg, szClassName); 
        MessageBox(NULL, msg, "Error", MB_OK); 
        return; 
    } 
 
    hWnd = CreateWindow(szClassName, windowName, windowStyle, x, y, width, height, hParent, (HMENU)NULL, 
           hInst, NULL); 
 
    if(!hWnd) 
    { 
        char text[100] = "Cannot create window"; 
        strcat(text, windowName); 
        MessageBox(NULL, text, "Error", MB_OK);
        return; 
    } 
 
    ShowWindow(hWnd, cmdShow); 
}

#include <Windows.h> 
#include "KWnd.h" 
#include"stdafx.h"
 
 
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); 
 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,LPSTR lpCmdLine, int nCmdShow) 
{ 
    MSG msg; 
    KWnd mainWnd("A Hello2 Application", hInstance, nCmdShow, WndProc); 
 
    while (GetMessage(&msg, NULL, 0, 0)) 
    { 
        TranslateMessage(&msg); 
        DispatchMessage(&msg); 
    } 
 
    return msg.wParam; 
} 
 
LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) 
{ 
    HDC hDC; 
    PAINTSTRUCT ps; 
    RECT rect; 
    int userReply; 
 
    switch(uMsg) 
    {  
    case WM_PAINT:
           hDC = BeginPaint(hWnd, &ps); 
 
           GetClientRect(hWnd, &rect); 
           DrawText(hDC, "Hello World!", -1, &rect, 
               DT_SINGLELINE | DT_CENTER | DT_VCENTER ); 
 
           EndPaint(hWnd, &ps); 
           break;  
 
    case WM_CLOSE: 
        userReply = MessageBox(hWnd, "Tochno zakrit preloshenie","",MB_YESNO | MB_ICONQUESTION); 
        if(IDYES == userReply) 
            DestroyWindow(hWnd); 
        break; 
 
    case WM_DESTROY: 
        PostQuitMessage(0); 
        break; 
 
    default: 
        return DefWindowProc(hWnd, uMsg, wParam, lParam); 
    } 
    return 0; 
}