Thread: App wont open

I'm using the tutorial from www.gametutorials.com to make a simple game, i started off just a plain window with a black background but when i compile it and run it, the window doesn't show up and after a while, i ended up copying almost the entire thing from the tutorial but the window still wouldn't show up. I'm new to win32 so the mistake is probably obvious.

Code:

HWND CreateMainWindow(HINSTANCE hInstance)
{
     HWND hWnd = NULL;
     WNDCLASS wc;
     
     memset(&wc, 0, sizeof(WNDCLASS));
     
     wc.hInstance     = hInstance;
     wc.lpszClassName = "Game";
     wc.lpfnWndProc   = WinProc;
     wc.style         = CS_HREDRAW | CS_VREDRAW;
     wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
     wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
     wc.lpszMenuName  = NULL;
     wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
     
     RegisterClass(&wc);
     
     hWnd = CreateWindow("Game",
                         "Game",
                         WS_OVERLAPPEDWINDOW | WS_CLIPSIBLINGS | WS_CLIPCHILDREN,
                         CW_USEDEFAULT,
                         CW_USEDEFAULT,
                         600,
                         600,
                         NULL,
                         NULL,
                         hInstance,
                         NULL);
     
     g_hInstance = hInstance;                    
     
     ShowWindow(hWnd, SW_SHOWNORMAL);
     UpdateWindow(hWnd);
     
     return hWnd;
}

Code:

int WINAPI WinMain (HINSTANCE hThisInstance, 
                    HINSTANCE hPrevInstance, 
                    LPSTR lpszargv,
                    int ishow)
{
     HWND hWnd = CreateMainWindow(hThisInstance);
     
     if (hWnd == NULL) return false;
     
     init(hWnd);
     
     return (int)MainLoop();
}

every function here have been declared and defined

Also, if anyone has that tutorial, does MainLoop return a WPARAM? the return value isnt used anywhere so why not void?