黑客屏保 代码来自网络搜索 做了部分改动

#include "stdafx.h"
#include <windows.h>
#include <locale>
#include <exception>

#pragma comment (lib,"User32.lib")
#pragma comment (lib,"Gdi32.lib")

#define ID_TIMER 1 
#define STRMAXLEN 19 //一个显示列的最大长度 
#define STRMINLEN 8 //一个显示列的最小长度
#pragma comment ( linker, "/subsystem:windows /entry:mainCRTStartup" ) //去除启动或退出程序时黑框

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

typedef struct tagCharColumn
{
TCHAR letters[STRMAXLEN];
int x, y, iStrLen; //显示列的开始显示的x,y坐标,iStrLen是这个列的长度 
int iStopTimes, iMustStopTimes; //已经停滞的次数和必须停滞的次数,必须停滞的次数是随机的 
}CharColumn, *pCharColumn;

TCHAR randomChar() //随机字符产生函数 
{
return (TCHAR)(rand() % 255); //33到126之间 
}

int init(CharColumn *cc, int cyScreen, int x) //初始化 
{
static unsigned int t = 0;
int j;


cc->iStrLen = rand() % (STRMAXLEN - STRMINLEN) + STRMINLEN; //显示列的长度 
for (int i = 0; i < cc->iStrLen; i++)
cc->letters[i] = randomChar();
cc->x = x + 3; //显示列的开始显示的x坐标 
cc->y = rand() % 3 ? rand() % cyScreen : 0; //显示列的开始显示的y坐标 
cc->iMustStopTimes = rand() % 6;
cc->iStopTimes = 0;

if (t % 5 == 0)
{
memcpy(cc->letters, _T(" 峰言 制作 "), sizeof(_T(" 峰言 制作 ")));
cc->iStrLen = sizeof(_T(" 峰言 制作 ")) / sizeof(TCHAR) - 1;
}

cc->letters[0] = randomChar();
t++;
return t;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc;
//ctn 用来确定一个显示链是否 向下前进,如果等待次数超过必须等待的次数,ctn就代表要向下前进 
int i, j, temp, ctn; //j为一个显示链中除链表头外的在屏幕上显示的y坐标,temp绿色过度到黑色之用 
static HDC hdcMem;
HFONT hFont;
static HBITMAP hBitmap;
static int cxScreen, cyScreen; //屏幕的宽度 高度. 
static int iFontWidth = 19, iFontHeight = 22, iColumnCount; //字体的宽度 高度, 列数 
static CharColumn *ccChain;

switch (message)
{
case WM_CREATE:
cxScreen = GetSystemMetrics(SM_CXSCREEN); //屏幕宽度 
cyScreen = GetSystemMetrics(SM_CYSCREEN);
SetTimer(hwnd, ID_TIMER, 20, NULL);

hdc = GetDC(hwnd);
hdcMem = CreateCompatibleDC(hdc);
hBitmap = CreateCompatibleBitmap(hdc, cxScreen, cyScreen);
SelectObject(hdcMem, hBitmap);
ReleaseDC(hwnd, hdc);
//创建字体 
hFont = CreateFont(iFontHeight, iFontWidth - 5, 0, 0, FW_BOLD, 0, 0, 0,
DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS,
DRAFT_QUALITY, FIXED_PITCH | FF_SWISS, TEXT("Consolas"));
SelectObject(hdcMem, hFont);
DeleteObject(hFont);
SetBkMode(hdcMem, TRANSPARENT); //设置背景模式为 透明 
iColumnCount = cxScreen / (iFontWidth * 3 / 2); //屏幕所显示字母雨的列数

ccChain = (pCharColumn)calloc(iColumnCount, sizeof(CharColumn));
for (i = 0; i < iColumnCount; i++)
{
init(ccChain + i, cyScreen, (iFontWidth * 3 / 2)*i);
}

return 0;
case WM_TIMER:
hdc = GetDC(hwnd);
PatBlt(hdcMem, 0, 0, cxScreen, cyScreen, BLACKNESS); //将内存设备映像刷成黑色 
for (i = 0; i < iColumnCount; i++)
{
int letterIndex = 0;
ctn = ccChain[i].iStopTimes++ > ccChain[i].iMustStopTimes;

SetTextColor(hdcMem, RGB(255, 255, 255));
TextOut(hdcMem, ccChain[i].x, ccChain[i].y, &(ccChain[i].letters[letterIndex]), 1);
j = (ccChain + i)->y;
letterIndex++;
//遍历整个显示列,将这个显示列里的字符从下往上显示 
temp = 0; //temp绿色过度到黑色之用 
while (letterIndex < ccChain[i].iStrLen)
{
SetTextColor(hdcMem, RGB(0, 255 - (255 * (temp++) / (ccChain + i)->iStrLen), 0));
TextOut(hdcMem, (ccChain + i)->x, j -= iFontHeight, &((ccChain + i)->letters[letterIndex]), 1);
letterIndex++;
}
if (ctn)
(ccChain + i)->iStopTimes = 0;
else continue;

(ccChain + i)->y += iFontHeight; //下次开始显示的y坐标 为当前的y坐标加上 一个字符的高度 
//如果开始显示的y坐标减去 整个显示列的长度超过了屏幕的高度
if ((ccChain + i)->y - (ccChain + i)->iStrLen*iFontHeight > cyScreen)
{
init(ccChain + i, cyScreen, (iFontWidth * 3 / 2)*i);
}
//链表的头 为此链表的前个元素,因为下次开始显示的时候 就相当与在整个显示列的开头添加个元素,然后在开始往上显示 
(ccChain + i)->letters[0] = randomChar();
}


BitBlt(hdc, 0, 0, cxScreen, cyScreen, hdcMem, 0, 0, SRCCOPY);
ReleaseDC(hwnd, hdc);
return 0;
//处理善后工作 
case WM_KEYDOWN:
case WM_LBUTTONDOWN:
case WM_DESTROY:
KillTimer(hwnd, ID_TIMER);
DeleteObject(hBitmap);
DeleteDC(hdcMem);
free(ccChain);
PostQuitMessage(0);
return 0;
}

 


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

}

int main(HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
std::locale::global(std::locale(""));
setlocale(LC_CTYPE, "");
static TCHAR szAppName[] = TEXT("matrix");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;

wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;

wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;

if (!RegisterClass(&wndclass))
{
MessageBox(NULL, TEXT("此程序必须运行在NT下!"), szAppName, MB_ICONERROR);
return 0;
}

hwnd = CreateWindow(szAppName, NULL,
WS_DLGFRAME | WS_THICKFRAME | WS_POPUP,
0, 0,
GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN),
NULL, NULL, hInstance,
NULL);

ShowWindow(hwnd, SW_SHOWMAXIMIZED); //最大化显示 
UpdateWindow(hwnd);
ShowCursor(FALSE); //隐藏鼠标光标

srand((int)GetCurrentTime()); //初始化随机数发生器 
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
ShowCursor(TRUE); //显示鼠标光标 
return msg.wParam;
}

　　

版本2

//数字流星雨   作者：Wicrecend
#include "stdafx.h"
#include <windows.h>
#include <locale>
#include <exception>
#include <deque>

using namespace std;

#pragma comment (lib,"User32.lib")
#pragma comment (lib,"Gdi32.lib")

#define USER_INF _T("    作制 言峰")
#define ID_TIMER    1 
#define STRMAXLEN  25 //一个显示列的最大长度 
#define STRMINLEN  8  //一个显示列的最小长度
#pragma comment ( linker, "/subsystem:windows /entry:mainCRTStartup" ) //去除启动或退出程序时黑框

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

class CharColumn
{
public:
	CharColumn() : x(0),y(0), iStrLen(0), isUserInfo(false),
		iStopTimes(0), iMustStopTimes(0)
	{

	}
	~CharColumn(){}
	int initNormal(int cyScreen, int cx) {
		iStrLen = rand() % (STRMAXLEN - STRMINLEN) + STRMINLEN; //显示列的长度 
		x = cx + 3;        //显示列的开始显示的x坐标 
		y = rand() % 3 ? rand() % cyScreen : 0; //显示列的开始显示的y坐标 
		iMustStopTimes = rand() % 6;
		iStopTimes = 0;

		for (int i = 0; i < iStrLen; i++)
		{
			dequeLetters.push_back(randomChar());
		}
		return 0;
	}
	int initUserInfo(int cyScreen, int cx) {
		iStrLen = rand() % (STRMAXLEN - STRMINLEN) + STRMINLEN; //显示列的长度 
		iStrLen = sizeof(USER_INF) / sizeof(TCHAR) - 1;
		x = cx + 3;        //显示列的开始显示的x坐标 
		y = rand() % 3 ? rand() % cyScreen : 0; //显示列的开始显示的y坐标 
		iMustStopTimes = rand() % 6;
		iStopTimes = 0;
		TCHAR* str = USER_INF;
		for (int i = 0; i < iStrLen; i++)
		{
			dequeLetters.push_back(*(str+i));
		}
		isUserInfo = true;
		return 0;

	}

	int init(int cyScreen, int cx) {
		iNum++;
		if (iNum % 5)
		{
			return initNormal(cyScreen,cx);
		}
		return initUserInfo(cyScreen, cx);
	
	}
	TCHAR randomChar() //随机字符产生函数 
	{
		return (TCHAR)(rand() % (126 - 33) + 33); //33到126之间 
	}
	static int iNum;
	bool isUserInfo;
	deque<TCHAR> dequeLetters;
	int x, y, iStrLen; //显示列的开始显示的x,y坐标,iStrLen是这个列的长度 
	int iStopTimes, iMustStopTimes;
};
int CharColumn::iNum = 0;

int main(HINSTANCE hInstance, HINSTANCE hPrevInstance,
	PSTR szCmdLine, int iCmdShow)
{
	static TCHAR szAppName[] = TEXT("matrix");
	HWND            hwnd;
	MSG            msg;
	WNDCLASS    wndclass;

	wndclass.style = CS_HREDRAW | CS_VREDRAW;
	wndclass.lpfnWndProc = WndProc;
	wndclass.cbClsExtra = 0;
	wndclass.cbWndExtra = 0;
	wndclass.hInstance = hInstance;

	wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
	wndclass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
	wndclass.lpszMenuName = NULL;
	wndclass.lpszClassName = szAppName;

	if (!RegisterClass(&wndclass))
	{
		MessageBox(NULL, TEXT("此程序必须运行在NT下!"), szAppName, MB_ICONERROR);
		return 0;
	}

	hwnd = CreateWindow(szAppName, NULL,
		WS_DLGFRAME | WS_THICKFRAME | WS_POPUP,
		0, 0,
		GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN),
		NULL, NULL, hInstance,
		NULL);

	ShowWindow(hwnd, SW_SHOWMAXIMIZED); //最大化显示 
	UpdateWindow(hwnd);
	ShowCursor(FALSE); //隐藏鼠标光标 

	srand((int)GetCurrentTime()); //初始化随机数发生器 
	while (GetMessage(&msg, NULL, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	ShowCursor(TRUE); //显示鼠标光标 
	return msg.wParam;
}


LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	HDC          hdc;
	//ctn 用来确定一个显示链是否 向下前进,如果等待次数超过必须等待的次数,ctn就代表要向下前进 
	int i, j, temp, ctn; //j为一个显示链中除链表头外的在屏幕上显示的y坐标,temp绿色过度到黑色之用 
	static  HDC hdcMem;
	HFONT    hFont;
	static  HBITMAP hBitmap;
	static  int cxScreen, cyScreen; //屏幕的宽度 高度. 
	static  int iFontWidth = 13, iFontHeight = 17, iColumnCount; //字体的宽度 高度, 列数 
	static  CharColumn *ccChain;

	switch (message)
	{
	case WM_CREATE:
		cxScreen = GetSystemMetrics(SM_CXSCREEN); //屏幕宽度 
		cyScreen = GetSystemMetrics(SM_CYSCREEN);
		SetTimer(hwnd, ID_TIMER, 20, NULL);

		hdc = GetDC(hwnd);
		hdcMem = CreateCompatibleDC(hdc);
		hBitmap = CreateCompatibleBitmap(hdc, cxScreen, cyScreen);
		SelectObject(hdcMem, hBitmap);
		ReleaseDC(hwnd, hdc);
		//创建字体 
		hFont = CreateFont(iFontHeight, iFontWidth - 5, 0, 0, FW_BOLD, 0, 0, 0,
			DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS,
			DRAFT_QUALITY, FIXED_PITCH | FF_SWISS, TEXT("Fixedsys"));
		SelectObject(hdcMem, hFont);
		DeleteObject(hFont);
		SetBkMode(hdcMem, TRANSPARENT); //设置背景模式为 透明 
		iColumnCount = cxScreen / (iFontWidth * 3 / 2); //屏幕所显示字母雨的列数

		ccChain = new  CharColumn[iColumnCount];
		for (i = 0; i<iColumnCount; i++)
		{
			ccChain[i].init(cyScreen, (iFontWidth * 3 / 2)*i);
		}
		return 0;
	case WM_TIMER:
		hdc = GetDC(hwnd);
		PatBlt(hdcMem, 0, 0, cxScreen, cyScreen, BLACKNESS); //将内存设备映像刷成黑色 
		for (i = 0; i < iColumnCount; i++)
		{
			int index = 0;
			ctn = ccChain[i].iStopTimes++ >ccChain[i].iMustStopTimes;
			SetTextColor(hdcMem, RGB(255, 255, 255));
			TextOut(hdcMem, ccChain[i].x, ccChain[i].y, &(ccChain[i].dequeLetters[index]), 1);
			j = ccChain[i].y;
			index++;
			temp = 0; //temp绿色过度到黑色之用 
			while (index < ccChain[i].iStrLen)
			{
				SetTextColor(hdcMem, RGB(0, 255 - (255 * (temp++) / (ccChain + i)->iStrLen), 0));
				TextOut(hdcMem, (ccChain + i)->x, j -= iFontHeight, &( ccChain[i].dequeLetters[index] ), 1);
				index++;
			}
			if (ctn)
				(ccChain + i)->iStopTimes = 0;
			else continue;
			ccChain[i].y += iFontHeight;
			if ( ccChain[i].y - ccChain[i].iStrLen*iFontHeight > cyScreen)
			{
				ccChain[i].dequeLetters.clear();
				ccChain[i].init(cyScreen, (iFontWidth * 3 / 2)*i);
			}
			if (ccChain[i].isUserInfo)
			{
				TCHAR l = ccChain[i].dequeLetters.back();   
				ccChain[i].dequeLetters.pop_back();
				ccChain[i].dequeLetters.push_front(l);
			}
			else
			{
				ccChain[i].dequeLetters.push_front(ccChain[i].randomChar());
				ccChain[i].dequeLetters.pop_back();
			}
			
		}
		BitBlt(hdc, 0, 0, cxScreen, cyScreen, hdcMem, 0, 0, SRCCOPY);
		ReleaseDC(hwnd, hdc);
		return 0;

	case WM_RBUTTONDOWN:
	case WM_RBUTTONUP:
	case WM_KEYDOWN:
	case WM_LBUTTONDOWN:
	case WM_DESTROY:
		KillTimer(hwnd, ID_TIMER);
		DeleteObject(hBitmap);
		DeleteDC(hdcMem);
		delete[] ccChain;
		PostQuitMessage(0);
		return 0;
	}

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