Use Python Win32gui Draw Something And Get Info On Some Window Specialized By Points

import win32gui
from re import match
def draw_line():
    print 'x1,y1,x2,y2?'
    s=raw_input()
    if match('\d+,\d+,\d+,\d+',s):
        x1,y1,x2,y2=s.split(',')
        x1=int(x1)
        y1=int(y1)
        x2=int(x2)
        y2=int(y2)
        hwnd=win32gui.WindowFromPoint((x1,y1))
        hdc=win32gui.GetDC(hwnd)
        x1c,y1c=win32gui.ScreenToClient(hwnd,(x1,y1))
        x2c,y2c=win32gui.ScreenToClient(hwnd,(x2,y2))
        win32gui.MoveToEx(hdc,x1c,y1c)
        win32gui.LineTo(hdc,x2c,y2c)
        win32gui.ReleaseDC(hwnd,hdc)
    main()
def draw_point():
    print 'x,y,color?'
    s=raw_input()
    if match('\d+,\d+,\d+',s):
        x,y,color=s.split(',')
        x=int(x)
        y=int(y)
        color=int(color)
        hwnd=win32gui.WindowFromPoint((x,y))
        hdc=win32gui.GetDC(hwnd)
        x1,y1=win32gui.ScreenToClient(hwnd,(x,y))
        win32gui.SetPixel(hdc,x1,y1,color)
        win32gui.ReleaseDC(hwnd,hdc)
    main()
def get_pixel_col():
    print 'x,y?'
    s=raw_input()
    if match('\d+,\d+',s):
        x,y=s.split(',')
        x=int(x)
        y=int(y)
        hwnd=win32gui.WindowFromPoint((x,y))
        hdc=win32gui.GetDC(hwnd)
        x1,y1=win32gui.ScreenToClient(hwnd,(x,y))
        color=win32gui.GetPixel(hdc,x1,y1)
        win32gui.ReleaseDC(hwnd,hdc)
        print color
    main()
def get_current_pos_info():
    x,y=win32gui.GetCursorPos()
    hwnd=win32gui.WindowFromPoint((x,y))
    hdc=win32gui.GetDC(hwnd)
    x1,y1=win32gui.ScreenToClient(hwnd,(x,y))
    print x,y,win32gui.GetPixel(hdc,x1,y1)
    win32gui.ReleaseDC(hwnd,hdc)
    main()
def main():
    print ('''l. draw line
p. draw point
g. get pixel color
c. get current mouse position's info''')
    s=raw_input()
    if s.lower()=='l':
        draw_line()
    if s.lower()=='p':
        draw_point()
    if s.lower()=='g':
        get_pixel_col()
    if s.lower()=='c':
        get_current_pos_info()
main()