【黑客帝国】数字雨c代码

#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