一位素不相识的朋友做的代码雨屏保程序

来源：互联网发布：linux mv命令详解编辑：程序博客网时间：2024/06/11 21:47
用VS编译后改后缀名为scr,放到屏保目录
// Rain.cpp : 定义控制台应用程序的入口点。//#include “stdafx.h”#include <windows.h> #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 LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ; ////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////// typedef struct tagCharChain //整个当作屏幕的一个显示列,这是个双向列表 {         struct tagCharChain *prev; //链表的前个元素         TCHAR  ch;                  //一个显示列中的一个字符         struct tagCharChain *next; //链表的后个元素 }CharChain, *pCharChain; typedef struct tagCharColumn {         CharChain *head, *current, *point;         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; 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 ; } TCHAR randomChar() //随机字符产生函数 {         return (TCHAR)(rand()%(126-33)+33); //33到126之间 } int init(CharColumn *cc, int cyScreen, int x) //初始化 {         int j;         cc->iStrLen = rand()%(STRMAXLEN-STRMINLEN) + STRMINLEN; //显示列的长度         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 ;         cc->head = cc->current =                         (pCharChain)calloc(cc->iStrLen, sizeof(CharChain)); //生成显示列         for(j=0; j<cc->iStrLen-1; j++)         {                 cc->current->prev = cc->point; //cc->point一个显示列的前个元素                 cc->current->ch  = '\0';                 cc->current->next = cc->current+1; //cc->current+1一个显示列的后个元素                 cc->point          = cc->current++; //cc->point = cc->current; cc->current++;         }         cc->current->prev = cc->point; //最后一个节点         cc->current->ch  = '\0';         cc->current->next = cc->head;         cc->head->prev    = cc->current; //头节点的前一个为此链的最后一个元素         cc->current = cc->point = cc->head; //free掉申请的内存要用current当参数         cc->head->ch = randomChar(); // 对链表头的 元素填充         return 0; } 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=10, iFontHeight=15, 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, 10, 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 = (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++)             {                 ctn = (ccChain+i)->iStopTimes++ > (ccChain+i)->iMustStopTimes;                 //                 (ccChain+i)->point = (ccChain+i)->head; //point用于遍历整个显示列                                  //第一个字符显示为 白色                 SetTextColor(hdcMem, RGB(255, 255, 255));                 TextOut(hdcMem, (ccChain+i)->x, (ccChain+i)->y, &((ccChain+i)->point->ch), 1);                 j = (ccChain+i)->y;                  (ccChain+i)->point = (ccChain+i)->point->next;                 //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((ccChain+i)->point != (ccChain+i)->head && (ccChain+i)->point->ch)                 {                         SetTextColor(hdcMem, RGB(0, 255-(255*(temp++)/(ccChain+i)->iStrLen), 0));                         TextOut(hdcMem, (ccChain+i)->x, j-=iFontHeight, &((ccChain+i)->point->ch), 1);                         (ccChain+i)->point = (ccChain+i)->point->next;                 }                 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)                 {                         free( (ccChain+i)->current );                         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)->head = (ccChain+i)->head->prev;                 (ccChain+i)->head->ch = randomChar();             }                          BitBlt(hdc, 0, 0, cxScreen, cyScreen, hdcMem, 0, 0, SRCCOPY);             ReleaseDC(hwnd, hdc);             return 0;         case WM_RBUTTONDOWN:             KillTimer (hwnd, ID_TIMER) ;             return 0;         case WM_RBUTTONUP:             SetTimer (hwnd, ID_TIMER, 10, NULL) ;             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);             for(i=0; i<iColumnCount; i++)             {                 free( (ccChain+i)->current );             }             free(ccChain);             PostQuitMessage (0) ;             return 0 ;         }         return DefWindowProc (hwnd, message, wParam, lParam) ; }
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