Creating an Overlapped Window

1. Initialize a window class structure WNDCLASSEX and register it.

2. Call CreateWindowEx and show it.

#include <windows.h>

HWND            hWnd=NULL;
HINSTANCE       hInstance;
BOOL            FullScreen=TRUE;

BOOL InitApplication(HINSTANCE hinstance);
BOOL InitInstance(HINSTANCE hinstance, int nCmdShow);
LRESULT CALLBACK MainWndProc(HWND, UINT, WPARAM, LPARAM);

WINAPI WinMain(HINSTANCE hinstance, HINSTANCE, LPSTR, int nCmdShow)
{
	MSG msg;

	if (!InitApplication(hinstance)) return FALSE;
	if (!InitInstance(hinstance, nCmdShow)) return FALSE;

	while (GetMessage(&msg, (HWND) NULL, 0, 0) != 0 && GetMessage(&msg,    (HWND) NULL, 0, 0) != -1)
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return 0;
}

BOOL InitApplication(HINSTANCE hinstance)
{
	WNDCLASSEX wcx;
	memset(&wcx, 0, sizeof(wcx));
	wcx.cbSize = sizeof(wcx); // size of WNDCLASSEX structure
	wcx.style = CS_HREDRAW | CS_VREDRAW;
	wcx.lpfnWndProc = MainWndProc; // suuply pointer to the window procedure
	wcx.cbClsExtra = 0;
	wcx.cbWndExtra = 0;
	wcx.hInstance = hinstance; // handle to application instance
	wcx.hIcon = LoadIcon(NULL,IDI_APPLICATION);
	wcx.hCursor = LoadCursor(NULL,IDC_ARROW);
	wcx.hbrBackground = (HBRUSH) GetStockObject(BLACK_BRUSH); // a window with a black background
	wcx.lpszMenuName = 0; // name associated with the menu resource
	wcx.lpszClassName = "MainWClass"; // name associated with this window class

	return RegisterClassEx(&wcx);
}

BOOL InitInstance(HINSTANCE hinstance, int nCmdShow)
{
	// Save the application-instance handle.
	hInstance = hinstance;
	// Create the main window.
	hWnd = CreateWindowEx(WS_EX_OVERLAPPEDWINDOW,
   						"MainWClass",
						"Window created with CreateWindowEx",
						WS_OVERLAPPEDWINDOW,
						0,0,
						CW_USEDEFAULT,
						CW_USEDEFAULT,
						NULL,
						NULL,
						hinstance,
						NULL);
	if (!hWnd) return FALSE;
	ShowWindow(hWnd, nCmdShow);
	UpdateWindow(hWnd);
	return TRUE;
}

LRESULT CALLBACK MainWndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	LRESULT lResult;

	switch (msg)
	{
		case WM_CREATE:
			lResult = 0;
			break;

		case WM_DESTROY:
			PostQuitMessage(0);
			lResult = 0;
			break;

		case WM_PAINT:
			lResult = 0;
			break;
		default:
			lResult = DefWindowProc(hwnd, msg, wParam, lParam);
			break;
	}
	return lResult;
}