Dlaczego po kompilacji stworzony exek nie dziala

Jestem poczatkujacym c++'owcem
i probowalem napisac windowsowski program oto kod(kod nie jest samplesem , napisalem go sam z drobna pomoca kursu);

#define WIN32_LEAN_AND_MEAN 

#include<windows.h> 



LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
 {
  PAINTSTRUCT paintStruct;
  HDC hDC;    
  char string[] = "Witam"; 
  
  switch(message)
   {
    case WM_CREATE:
     return 0;
     break;
    case WM_CLOSE:
     PostQuitMessage(0);
     return 0;
     break;
    case WM_PAINT:
     hDC = BeginPaint(hwnd, &paintStruct);
     //niebieski
     SetTextColor(hDC,COLORREF(0x00FF0000));
     TextOut(hDC,150,150,string,sizeof(string)-1);
     EndPaint(hwnd, &paintStruct);
     return 0;
     break;
    default:
     break;
  }
   return (DefWindowProc(hwnd, message, wParam,lParam)); 
 }


int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, 
                    int nShowCmd)
 {
  WNDCLASSEX wc; 
  HWND hwnd;     
  MSG msg;       
  bool done;     
  
  
  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    = LoadCursor(NULL, IDC_ARROW);
  wc.hbrBackground =(HBRUSH)GetStockObject(WHITE_BRUSH);
  wc.lpszMenuName  = NULL;
  wc.lpszClassName = "klasa1";
  wc.hIconSm       = LoadIcon(NULL,IDI_WINLOGO);
  
  if (RegisterClassEx(&wc))
   return 0;
  
  
  hwnd = CreateWindowEx(NULL,
                        "klasa1",
                        "Pierwsza aplikacja",
                        WS_OVERLAPPEDWINDOW | WS_VISIBLE | WS_SYSMENU,
                        100, 100,
                        400, 400,
                        NULL,
                        NULL,
                        hInstance,
                        NULL);
  if (!hwnd)
   return 0;
  
  done = false;
  
  while (!done)
   {
    PeekMessage(&msg, hwnd, NULL, NULL, PM_REMOVE);
    if (msg.message == WM_QUIT) 
     {
      done=true;
     }
    else
     {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
     }
   }
  return msg.wParam; 
 }

kompiluje sie bezlednie ale exek nie dziala [???]
opisze dokładniej:
1.kompilacja bez bledow
2. Powstaje exek
3.uruchamiam exeka a nic sie niepokazuje tak jakbym nic nie robil

na dole masz standardowy szablon aplikacji windowsowej po utworzeniu nowego projektu w Dev-C++
szczerze mowiac kupilbym sobie na Twoim miejscu ksiazke "Programowanie Windows" charlsa petzolda - bo bez niej bedzie ci trudno nauczyc sie dobrze programowac w windows ze zrozumieniem dzialania calego systemu

twoj kod wklejony

[code]
#include <windows.h>

/* Declare Windows procedure */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

/* Make the class name into a global variable */
char szClassName[ ] = "WindowsApp";

int WINAPI
WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nFunsterStil)

{
HWND hwnd; /* This is the handle for our window /
MSG messages; / Here messages to the application are saved /
WNDCLASSEX wincl; / Data structure for the windowclass */

/* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
wincl.style = CS_DBLCLKS;                 /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);

/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL;                 /* No menu */
wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
wincl.cbWndExtra = 0;                      /* structure or the window instance */
/* Use Windows's default color as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;

/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
    return 0;

/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
       0,                   /* Extended possibilites for variation */
       szClassName,         /* Classname */
       "Windows App",       /* Title Text */
       WS_OVERLAPPEDWINDOW, /* default window */
       CW_USEDEFAULT,       /* Windows decides the position */
       CW_USEDEFAULT,       /* where the window ends up on the screen */
       544,                 /* The programs width */
       375,                 /* and height in pixels */
       HWND_DESKTOP,        /* The window is a child-window to desktop */
       NULL,                /* No menu */
       hThisInstance,       /* Program Instance handler */
       NULL                 /* No Window Creation data */
       );

/* Make the window visible on the screen */
ShowWindow (hwnd, nFunsterStil);

/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0))
{
    /* Translate virtual-key messages into character messages */
    TranslateMessage(&messages);
    /* Send message to WindowProcedure */
    DispatchMessage(&messages);
}

/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;

}

/* This function is called by the Windows function DispatchMessage() */

LRESULT CALLBACK
WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) /* handle the messages /
{
case WM_DESTROY:
PostQuitMessage (0); / send a WM_QUIT to the message queue /
break;
default: / for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}

return 0;

}[/code]