Плывущий экран на c++

 #include <Windows.h> 
#include <windows.h> 
#include "stdafx.h" 
 
int scrWidth; 
int scrHeight; 
int intervalspeed = 100; 
 
LRESULT CALLBACK HyperGoto(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) { 
	switch (msg) 
	{ 
	case WM_CREATE: 
		{ 
			HDC desktop = GetDC(HWND_DESKTOP); 
			HDC window = GetDC(hWnd); 
			 
			if (desktop && window) { 
				BitBlt(window, 0, 0, scrWidth, scrHeight, desktop, 0, 0, SRCCOPY); 
			} 
			 
			if (window) ReleaseDC(hWnd, window); 
			if (desktop) ReleaseDC(HWND_DESKTOP, desktop); 
			 
			SetTimer(hWnd, 0, intervalspeed, 0); 
			 
			ShowWindow(hWnd, SW_SHOW); 
			break; 
		} 
	case WM_PAINT: 
		{ 
			ValidateRect(hWnd, 0); 
			break; 
		} 
	case WM_TIMER: 
		{ 
			HDC wndw = GetDC(hWnd); 
			if (wndw) { 
				int x = (rand() % scrWidth) - (200 / 2); 
				int y = (rand() % 15); 
				 
				int width = (rand() % 200); 
				 
				BitBlt(wndw, x, y, width, scrHeight, wndw, x, 0, SRCCOPY); 
				 
				ReleaseDC(hWnd, wndw); 
			} 
			break; 
		} 
	case WM_DESTROY: 
		{ 
			KillTimer(hWnd, 0); 
			PostQuitMessage(0); 
			break; 
		} 
	default: 
		return DefWindowProc(hWnd, msg, wParam, lParam); 
	} 
	 
	return 0; 
} 
 
int APIENTRY WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmd, int showCmd) 
{ 
	scrWidth = GetSystemMetrics(SM_CXSCREEN); 
	scrHeight = GetSystemMetrics(SM_CYSCREEN); 
	 
	WNDCLASSEX wndClass = { 0 }; 
	wndClass.cbSize = sizeof(WNDCLASSEX); 
	wndClass.style = CS_HREDRAW | CS_VREDRAW; 
	wndClass.lpfnWndProc = HyperGoto; 
	wndClass.hInstance = inst; 
	wndClass.hIcon = LoadIcon(0, IDI_APPLICATION); 
	wndClass.hCursor = LoadCursor(0, IDC_ARROW); 
	wndClass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH); 
	wndClass.lpszClassName = "HyperGoto.exe"; 
	 
	if (RegisterClassEx(&wndClass)) { 
		HWND hWnd = CreateWindowExA(WS_EX_TOPMOST, "HyperGoto.exe", "Hypergoto.exe", WS_POPUP,  
			0, 0, scrWidth, scrHeight, HWND_DESKTOP, 0, inst, 0); 
		 
		if (hWnd) { 
			srand(GetTickCount()); 
			 
			MSG msg = { 0 }; 
			 
			ShowWindow(hWnd, showCmd); 
			 
			while (msg.message != WM_QUIT) { 
				if (PeekMessage(&msg, 0, 0, 0, PM_REMOVE)) { 
					TranslateMessage(&msg); 
					DispatchMessage(&msg); 
				} 
			} 
			 
			return (int)msg.wParam; 
		} 
	} 
	 
	return 0; 
}