Python怎么实现录屏功能

    #设置主界面def set_init_window(self):    # 去掉tkinter默认的标题    self.tk.title('')    # 隐藏默认图标    self.tk.iconbitmap(self.icon_path())    #获取屏幕的宽度    screeWidth = self.tk.winfo_screenwidth()    #获取屏幕高度    screeHeight = self.tk.winfo_screenheight()        width = int((screeWidth - 500) / 2)    height = int((screeHeight - 300) / 2)    # 设置主界面的大小和默认位置    self.tk.geometry(f'500x100+{width}+{height}')        #添加开始录制按钮，点击之后开启两个线程：一个录屏、一个监听键盘    btn1 = tkinter.Button(self.tk, width=5, height=1, text='开始',    command=lambda:[threading.Thread(target=self.video_record).start(),threading.Thread(target=self.start_listen).start()])    btn1.pack()    # 设置按钮位置    btn1.place(x=110, y=50, anchor='n')        #开启新线程设置录屏范围    btn2 = tkinter.Button(self.tk, width=15, height=1, text='设置录制区域', command=lambda:threading.Thread(target=self.set_range).start())    btn2.pack()    btn2.place(x=230, y=50, anchor='n')#生成透明的icon图标def icon_path(self):    ICON = (b'x00x00x01x00x01x00x10x10x00x00x01x00x08x00hx05x00x00'            b'x16x00x00x00(x00x00x00x10x00x00x00 x00x00x00x01x00'            b'x08x00x00x00x00x00@x05x00x00x00x00x00x00x00x00x00x00'            b'x00x01x00x00x00x01') + b'x00' * 1282 + b'xff' * 64    _, ICON_PATH = tempfile.mkstemp()    with open(ICON_PATH, 'wb') as icon_file:        icon_file.write(ICON)    return ICON_PATH

#设置录屏范围def set_range(self):    #self.init_window.withdraw() #隐藏窗口    self.tk.state('icon')#窗口最小化    screeWidth = self.tk.winfo_screenwidth()    screeHeight = self.tk.winfo_screenheight()    self.newFrame = tkinter.Toplevel(self.tk,width=screeWidth,height=screeHeight,bg='white')#开启新窗口    self.newFrame.attributes('-transparentcolor', 'white')  # 使白色为透明色    self.newFrame.overrideredirect(True)  # 隐藏导航栏    self.canvas = tkinter.Canvas(self.newFrame,bg='white',bd=0,width=screeWidth,height=screeHeight)    self.canvas.bind('<Button-1>', self.onLeftButtonDown)#按下左键    self.canvas.bind('<B1-Motion>', self.onLeftButtonMove)#移动鼠标    self.canvas.bind('<ButtonRelease-1>', self.onLeftButtonUp)#抬起左键    self.canvas.pack(fill=tkinter.BOTH, expand=tkinter.YES)    time.sleep(0.3)    im = ImageGrab.grab()    # 暂存全屏截图    im.save('temp.png')    im.close()    self.image = tkinter.PhotoImage(file='temp.png')    os.remove('temp.png')    self.canvas.create_image(screeWidth//2, screeHeight//2, image=self.image)

#按下鼠标def onLeftButtonDown(self,event):    try:        self.canvas.delete(self.lastDraw)        self.canvas.delete(self.dot1)        self.canvas.delete(self.dot2)        self.btn3.destroy()    except Exception as e:        pass    self.X = event.x    self.Y = event.y    self.X2 = 0    self.Y2 = 0#移动鼠标def onLeftButtonMove(self,event):    try:  # 删除刚画完的图形，不然所有画的框都会出现        self.canvas.delete(self.lastDraw)        self.canvas.delete(self.dot1)        self.canvas.delete(self.dot2)        self.btn3.destroy()    except Exception as e:        pass    self.X2 = event.x    self.Y2 = event.y    self.lastDraw = self.canvas.create_rectangle(self.X, self.Y, event.x, event.y,width=2, outline='pink')#松开鼠标def onLeftButtonUp(self,event):    print("起点", self.X, self.Y)    print("终点", self.X2, self.Y2)    if self.X2==0 and self.X2==0:        return    self.width, self.high = self.X2-self.X,self.Y2-self.Y    self.region = (self.X, self.Y, self.X2, self.Y2)    self.dot1=self.canvas.create_text(self.X, self.Y - 10, text=f'({self.X},{self.Y})', font=("Purisa", 12), fill="pink")    self.dot2=self.canvas.create_text(self.X2, self.Y2 + 10, text=f'({self.X2},{self.Y2})', font=("Purisa", 12), fill="pink")    # self.newFrame.destroy()#销毁窗口    # self.init_window.deiconify()#显示窗口    # self.tk.state('normal')  # 取消窗口最小化    self.btn3 = tkinter.Button(self.canvas, width=15, height=1, text='确定录制区域',bg='pink',fg='#64854c',command=lambda:[self.newFrame.destroy(),self.tk.state('normal')])    self.btn3.pack()    self.btn3.place(x=self.X2-20, y=self.Y2+20, anchor='n')

# 开始监听def start_listen(self):    with keyboard.Listener(on_press=self.on_press) as listener:        listener.join()    # 监听按键def on_press(self,key):    if key == keyboard.Key.esc:        self.flag = True  # 改变        return False  # 返回False，键盘监听结束！

def video_record(self):     fourcc = cv2.VideoWriter_fourcc('X', 'V', 'I', 'D')     out = cv2.VideoWriter('output.mp4', fourcc, 14, (self.width, self.high))  # 参数分别为 输出文件名，解码方式，帧数，录像范围     self.count = 1     while (True):         img = ImageGrab.grab(self.region) #指定截取坐标(左边X，上边Y，右边X，下边Y)         img_np = numpy.array(img)         frame = cv2.cvtColor(img_np, cv2.COLOR_BGR2RGB)  # ImageGrab获取的颜色为BGR排序，需转换为RGB         out.write(frame)         self.count += 1         label = tkinter.Label(self.tk, text=f"{int(self.count / 14)}秒")         label.pack()         label.place(x=320, y=55, anchor='n')         # 点击ESC退出         if self.flag == True:             tkinter.messagebox.showinfo('提示', '录屏结束')             self.flag = False  # 改变录屏状态             break     out.release()     cv2.destroyAllWindows()