C Win32 snippet to create a non-movable window by handling the WM_MOVING message

nomovewin.c

#include <windows.h>

LRESULT CALLBACK WinProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);

TCHAR WinClassName[] = TEXT("NoMoveWinClass");

int WINAPI WinMain(
	_In_ HINSTANCE hInstance,
	_In_opt_ HINSTANCE hPrevInstance,
	_In_ LPSTR lpCmdLine,
	_In_ int nShowCmd)
{
	HWND hwnd;
	MSG msg;
	WNDCLASSEX wcl;

	wcl.cbClsExtra = 0;
	wcl.cbSize = sizeof(WNDCLASSEX);
	wcl.cbWndExtra = 0;
	wcl.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wcl.hCursor = LoadCursor(NULL, IDC_ARROW);
	wcl.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wcl.hIconSm = NULL;
	wcl.hInstance = hInstance;
	wcl.lpfnWndProc = WinProc;
	wcl.lpszClassName = WinClassName;
	wcl.lpszMenuName = NULL;
	wcl.style = 0;

	if (!RegisterClassEx(&wcl))
		return EXIT_FAILURE;

	hwnd = CreateWindow(
		WinClassName,
		TEXT("Non-Movable Window"),
		WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		NULL,
		NULL,
		hInstance,
		NULL);

	ShowWindow(hwnd, nShowCmd);
	UpdateWindow(hwnd);

	while (GetMessage(&msg, NULL, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return EXIT_SUCCESS;
}

LRESULT CALLBACK WinProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	static RECT wrect;
	switch (message)
	{
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	case WM_CREATE:
	case WM_SIZE:
		GetWindowRect(hwnd, &wrect);
		break;
	case WM_MOVING:
		*(RECT*)lParam = wrect;
		return TRUE; /*An application should return TRUE if it processes this message.*/
	default:
		return DefWindowProc(hwnd, message, wParam, lParam);
	}
	return 0;
}