Crackme with windows GUI

//Preprocessor files
#include <windows.h>

#define submitButton  101
#define passwordEdit  102

//Define variables
const char g_szClass[]   = "CrackMe!";
const char g_szCaption[] = "CrackMe!";
MSG Msg;
HWND hWindow;
WNDCLASSEX wcex;

HWND hSubmitButton;
HWND hPasswordEdit;

char counter;
char password[sizeof(g_szCaption)];
char userPassword[] = "Thank you for trying out my CrackMe. This is just a taster of what a CrackMe is like. Please note that this is very, very simple to crack. :)";

//Error function
DWORD WINAPI error() {
     MessageBox(NULL, NULL, "Error", MB_ICONERROR | MB_OK);
     PostQuitMessage(0);
}

DWORD WINAPI encryptPassword() {
      for(counter = false; counter < sizeof(g_szCaption); counter++)
                 password[counter] = g_szCaption[counter];
}

DWORD WINAPI checkPassword() {
      if(strcmp(password, userPassword) == false)
                      MessageBox(NULL, "Congratulations! You cracked the password.", "CrackMe!", MB_ICONEXCLAMATION | MB_OK);

      else
          MessageBox(NULL, "Sorry, the password you entered was incorrect.", "CrackMe!", MB_ICONEXCLAMATION | MB_OK);
}


//Message procedure
long FAR PASCAL WindowProc(HWND hWindow, UINT uMsg, WPARAM wParam, LPARAM lParam) {
     switch(uMsg) {
                  case WM_CREATE:
                       hPasswordEdit = CreateWindowEx(WS_EX_CLIENTEDGE, "Edit", false, WS_VISIBLE | WS_CHILD | WS_BORDER, 10, 10, 124, 27, hWindow, (HMENU)passwordEdit, false, NULL);
                       hSubmitButton = CreateWindowEx(false, "Button", "Submit", WS_VISIBLE | WS_CHILD | WS_BORDER, 24, 45, 95, 25, hWindow, (HMENU)submitButton, false, NULL);
                       break;

                  case WM_COMMAND:
                       switch(LOWORD(wParam)) {
                                              if(!HIWORD(wParam)) {
                                                                  case submitButton:
                                                                       GetDlgItemText(hWindow, passwordEdit, userPassword, 100);
                                                                       checkPassword();
                                              }
                       }
                       break;

                  case WM_DESTROY:
                       PostQuitMessage(false);
                       break;
                  }

     return DefWindowProc(hWindow, uMsg, wParam, lParam);
}

//WinMain
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrev, PSTR szCmdLine, int nCmdShow) {
    encryptPassword();

    //Create the window class & register it
    wcex.cbSize         = sizeof(wcex);
    wcex.style          = CS_CLASSDC;
    wcex.lpfnWndProc    = WindowProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInst;
    wcex.hIcon          = LoadIcon(NULL, IDI_APPLICATION);
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW + 0);
    wcex.lpszMenuName   = NULL;
    wcex.lpszClassName  = g_szClass;
    wcex.hIconSm        = LoadIcon(NULL, IDI_APPLICATION);

    if(!RegisterClassEx(&wcex))
      error();

    //Create window
    hWindow = CreateWindow(g_szClass, g_szCaption, WS_SYSMENU | WS_VISIBLE, CW_USEDEFAULT, CW_USEDEFAULT, 150, 100, NULL, NULL, hInst, NULL);

    //Show and update the window
    ShowWindow(hWindow, SW_NORMAL);
    UpdateWindow(hWindow);

    //Enter the message pump
    ZeroMemory(&Msg, sizeof(MSG));
    while(Msg.message != WM_QUIT) {
                      //Handle windows messages (if any)
                      if(PeekMessage(&Msg, NULL, false, false, PM_REMOVE)) {
                                           TranslateMessage(&Msg);
                                           DispatchMessage(&Msg);
                      }
    }

    return false;
}