例子
#include "windows.h"
#include "stdlib.h"
HDC MainDC;
void circle(int x,int y,int r)
{
Ellipse(MainDC,x,y,x + r,y + r);
}
void main()
{
SetConsoleTitle("123");
MainDC = GetDC(FindWindow(0,"123");
ststem("color 7a");
circle(20,20,40);
system("pause > nul");
}