用c语言实现的清理，恢复屏幕内容

#include <bios.h> #include <dos.h> #include <stdio.h> #define Error 0 #define start_x 1 #define end_x 20 #define start_y 1 #define end_y 40 union REGS in,out; /*--------------申请存储空间-------------*/ int *Apply_memory(int size) { int *point; point=(int *)malloc(size*sizeof(int)); if(!point) exit(Error); return point; } /*----------------打印屏幕--------------*/ void Print_screen(int startx,int starty,int endx,int endy) { int i,j; char ch; for(i=startx;i<endx;i++) for(j=starty;j<endy;j++) { gotoxy(j,i); ch=rand()%47; printf("%c",ch); } } /*----------设置 提示信息屏幕 大小--------*/ void Set_screen() { in.h.ah=6; in.h.al=0; in.h.bh=7; in.h.ch=6; in.h.cl=5; in.h.dh=12; in.h.dl=35; int86(0x10,&in,&out); gotoxy(12,9); } /*-----------保存屏幕------------*/ void Save_screen(int *buffer_screen,int startx,int starty,int endx,int endy) { int m=0,i,j; in.h.ah=8; in.h.bh=0; for(i=startx;i<endx;i++) for(j=starty;j<endy;j++) { gotoxy(j,i); buffer_screen[m++]=int86(0x10 ,&in,&out); } } /*----------恢复屏幕------------*/ void Restore_screen(int *buffer_screen,int startx,int starty,int endx,int endy) { int m=0,i,j; for(i=startx;i<endx;i++) for(j=starty;j<endy;j++) { gotoxy(j,i); in.h.ah=9; in.h.al=buffer_screen[m]; in.h.bl=7; in.h.bh=0; in.h.cl=0x01; in.h.ch=0x00; int86(0x10,&in,&out); m++; } } /*-----------打印提示信息------------*/ void Print_inform() { printf("Next,clean up screen" ); sleep(1); clrscr(); sleep(1); gotoxy(12,9); printf("Next,rewrite screen"); } void main() { register int i,j; int *buffer,length=800; buffer=Apply_memory(length); Print_screen(start_x,start_y,end_x,end_y); Save_screen(buffer,start_x,start_y,end_x,end_y); sleep(2); Set_screen(); Print_inform(); sleep(2); clrscr(); Restore_screen(buffer,start_x,start_y,end_x,end_y); free(buffer); getch(); }