黑客屏保代码来自网络搜索做了部分改动

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#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

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//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);
}