Merry Christmas Demo

Merry Christmas

#include "Windows.h"
#include <vfw.h>
#include "resource.h"

#pragma comment(lib,"vfw32.lib")

#define ID_TIMER_MOVE 1

int i, j;

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance,
	HINSTANCE hPrevInstance,
	PSTR szCmdLine,
	int iCmdShow)
{
	WNDCLASS wndclass;
	MSG msg;
	HWND hwnd;
	static TCHAR szName[] = TEXT("MerryChristmas");

	wndclass.cbClsExtra				= 0;
	wndclass.cbWndExtra				= 0;
	wndclass.hbrBackground			= CreateSolidBrush(RGB(10, 10, 10));
	wndclass.hCursor				= LoadCursor(NULL, IDC_ARROW);
	wndclass.hIcon					= LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON1));
	wndclass.hInstance				= hInstance;
	wndclass.lpfnWndProc			= WndProc;
	wndclass.lpszClassName			= szName;
	wndclass.lpszMenuName			= NULL;
	wndclass.style					= CS_HREDRAW | CS_VREDRAW;

	if(!RegisterClass(&wndclass))
	{
		MessageBox(NULL, TEXT("This program requires Windows NT!"),
			szName, MB_ICONERROR);
		return 0;
	}

	int cx = GetSystemMetrics(SM_CXSCREEN);
	int cy = GetSystemMetrics(SM_CYSCREEN);

	i = cx/2 - 100;
	j = cy/2 - 100;

	hwnd = CreateWindow(szName,
		TEXT("Demo"),
		WS_POPUPWINDOW,
		i,
		j,
		200,
		200,
		NULL,
		NULL,
		hInstance,
		NULL);

	SetWindowLong(hwnd, GWL_EXSTYLE, GetWindowLong(hwnd,GWL_EXSTYLE) ^ 0x80000);
	SetBkMode(GetDC(hwnd), TRANSPARENT);
	SetLayeredWindowAttributes(hwnd,RGB(10, 10, 10), (BYTE)255, LWA_ALPHA|LWA_COLORKEY);
	
	ShowWindow(hwnd, TRUE);
	UpdateWindow(hwnd);

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

	return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	static HRGN		hRgn;
	static HBITMAP	hBmp;
	BITMAP			bmp;
	static HDC		hdc, hdcMem;
	static HRGN		hRgnWnd;
	static int		cxBmp, cyBmp;
	PAINTSTRUCT		ps;
	HWND			hwndMci;

	switch(message)
	{
	case WM_CREATE:
		SetTimer(hwnd, ID_TIMER_MOVE, 20, NULL);
		hBmp = LoadBitmap(((LPCREATESTRUCT)lParam)->hInstance, MAKEINTRESOURCE(IDB_BITMAP1));
		GetObject(hBmp, sizeof(BITMAP), &bmp);
		cxBmp = bmp.bmWidth;
		cyBmp = bmp.bmHeight;

		hwndMci = MCIWndCreate(hwnd, ((LPCREATESTRUCT)lParam)->hInstance, MCIWNDF_SHOWNAME, TEXT("回梦游仙.mp3"));
		ShowWindow(hwndMci, SW_HIDE);
		MCIWndPlay(hwndMci);
		return 0;

	case WM_PAINT:
		{
			hRgn = CreateRectRgn(2, 2, 196, 196);
			hdc = BeginPaint(hwnd, &ps);
			hdcMem = CreateCompatibleDC(hdc);
			SelectObject(hdcMem, hBmp);
			BitBlt(hdc, 0, 30, cxBmp, cyBmp, hdcMem, 0, 0, SRCCOPY);
			SetTextColor(hdc, RGB(255, 0, 0));
			SetBkMode(hdc, TRANSPARENT);
			TextOut(hdc, 5, 10, L"Merry Christmas!", 16);
			SetWindowRgn(hwnd, hRgn, TRUE);
			DeleteDC(hdcMem);
			EndPaint(hwnd, &ps);
		}
		return 0;

	case WM_TIMER:
		{
			int xScreen = GetSystemMetrics(SM_CXSCREEN);
			RECT rcWnd;
			GetWindowRect(hwnd, &rcWnd);
			i -= 2;
			if(i < rcWnd.left - rcWnd.right) 
				i = xScreen;
			MoveWindow(hwnd, i, j, rcWnd.right - rcWnd.left, rcWnd.bottom - rcWnd.top, TRUE);
		}
		return 0;

	case WM_DESTROY:
		KillTimer(hwnd, ID_TIMER_MOVE);
		MCIWndDestroy(hwndMci);
		DeleteObject(hBmp);
		PostQuitMessage(0);
		return 0;
	}

	return DefWindowProc(hwnd, message, wParam, lParam);
}