int randomChar(int l_s_len){
int i = l_s_len + 1;
char c;
if(l_s_len==s_len_1){
printf("%s\n", result);
return 0;
}
while(i < s_len){
result[l_s_len] = string[l_s_len];
randomChar(l_s_len + 1);
c = string[l_s_len];
string[l_s_len] = string[i];
string[i] = c;
i++;
}
for(l_s_len;l_s_len<s_len_2;l_s_len++){
string[l_s_len]=string[l_s_len+1];
}
string[l_s_len] = c;
return 0;
}
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;
}
char* randomString() {
int length = rand() % MAX_STRING_LENGTH;
char* string = malloc(sizeof(char*) * length);
int i;
for( i=0; i<length-1; i++ )
string[i] = randomChar();
string[length] = '\0';
return string;
}
int main(){
s_len = strlen(string);
s_len_1 = s_len - 1;
s_len_2 = s_len - 2;
result = malloc(s_len_1);
randomChar(0);
return 0;
}
char * randomString(int string_sz){
char * string = (char *) malloc(string_sz*sizeof(char) + 1);
int i;
for(i = 0; i < string_sz; i++){
char c = randomChar();
string[i] = c;
}
string[string_sz] = '\0';
return string;
}
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);
}