#define _WIN32_WINNT 0x0500

#include <windows.h>

LRESULT CALLBACK MainWndProc(HWND hwnd, UINT wMsg,WPARAM wParam, LPARAM lParam)
{
    switch(wMsg)
    {
    case WM_CREATE:
        return 0;
    default:
        break;
    }
    return DefWindowProc(hwnd, wMsg, wParam, lParam);
}

BOOL init_window(HWND hwnd)
{
    HWND        hwndConsole;
    HINSTANCE   hinst;
    DWORD       dwStyle;
    WNDCLASS    wc;

    memset(&wc, 0, sizeof(wc));

    hwndConsole             =   GetConsoleWindow();
    hinst                   =   (HINSTANCE)GetWindowLong(hwndConsole, GWL_HINSTANCE);

    wc.lpszClassName        =   TEXT("A:WINDOW");
    wc.hInstance            =   hinst;
    wc.lpfnWndProc          =   (WNDPROC)MainWndProc;
    wc.hCursor              =   LoadCursor(hinst, TEXT("HAND"));
    wc.hIcon                =   LoadIcon(hinst, IDI_APPLICATION);
    wc.lpszMenuName         =   NULL;
    wc.hbrBackground        =   (HBRUSH)GetStockObject(WHITE_BRUSH);
    wc.style                =   CS_HREDRAW | CS_VREDRAW;
    wc.cbClsExtra           =   0;
    wc.cbWndExtra           =   0;       

    if(RegisterClass(&wc))
    {
        dwStyle = WS_OVERLAPPEDWINDOW;

        hwnd = CreateWindow(TEXT("A:WINDOW"),             // Class name
                            TEXT("A Window"),             // Title
                            dwStyle,                      // Style bits
                            0,                            // x - default
                            0,                            // y - default
                            640,                          // cx - default
                            480,                          // cy - default
                            NULL,                         // Parent
                            NULL,                         // Class menu
                            hinst,                        // Creator
                            NULL);                        // Params

        if(hwnd != NULL)
        {
            ShowWindow(hwnd, SW_SHOWNORMAL);
            return TRUE;
        }
    }
    return FALSE;
}

int main()
{
    MSG  msg;
    HWND hwnd = NULL;

    MessageBox(NULL, TEXT("Text"), TEXT("Caption"), MB_OKCANCEL | MB_ICONEXCLAMATION);
    if(init_window(hwnd))
    {
        while(GetMessage(&msg, hwnd, 0, 0))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    return 0;
}