Python 2.7 Tkinter 用 CV2 拍照

Question

我想制作一个 Python 2.7 Tkinter 拍摄网络摄像头照片，但我无法解决问题：我的程序不想读取变量并执行它。你能帮帮我吗？

这是我的代码：

import Tkinter as tk
import cv2
from PIL import Image, ImageTk

width, height = 800, 600    #Initialisation of webcam size
cap = cv2.VideoCapture(0)   #Type of Capture

takePicture = 0 #My variable

lmain = tk.Label()  #The Tk widget of webcam
lmain.pack()    #Pack option to see it
screenTake = tk.Button(text='ScreenShot' ) , command = TakePictureC) #The button for take picture
screenTake.pack()   #Pack option to see it

def TakePictureC(): #There is the change of the variable

    takePicture  = takePicture + 1 #Add "1" to the variable

def show_frame(): #CV2 webcam parameters
_, frame = cap.read()
frame = cv2.flip(frame, 1)
cv2image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGBA)
img = Image.fromarray(cv2image)
imgtk = ImageTk.PhotoImage(image=img)
lmain.imgtk = imgtk
lmain.configure(image=imgtk)
lmain.after(10, show_frame)

if takePicture == 1: #My option for take the image
    img.save("test.png") #Save the instant image
    takePicture  = takePicture - 1 #Remove "1" to the variable

show_frame() #CV2 show the webcam module
root = tk.Tk()                                  #basic parameters
root.bind('<Escape>', lambda e: root.quit())
root.title( "title" )
root.mainloop()                                 #end of the program

感谢您的帮助，祝您度过愉快的一周！（对不起，我的英语很差，我是法国学生：/）

我的错误信息：

C:\Users***\Desktop\Programmations\Python-Programming\PyStoMo>

python TestWeb1.py

Traceback (最近一次调用最后一次): File "TestWeb1.py", line 12, in screenTake = tk.Button(text='ScreenShot' , command = TakePictureC)#拍照的按钮

NameError: 名称“TakePictureC”未定义

Answer 1

如果您看到错误消息（“回溯”），则应完整显示（复制并粘贴）。

这一行：

screenTake = tk.Button(text='ScreenShot' ) , command = TakePictureC) #The button for take picture

有太多的')'。应该是：

screenTake = tk.Button(text='ScreenShot', command = TakePictureC) #The button for take picture

接下来，在函数内部，如果你给一个名字赋值，除非你另有说明，否则它会假设这个名字是本地的，所以当你尝试运行这个函数时：

def TakePictureC(): #There is the change of the variable

    takePicture  = takePicture + 1 #Add "1" to the variable

它会引发 NameError。

应该是：

def TakePictureC(): #There is the change of the variable
    global takePicture
    takePicture  = takePicture + 1 #Add "1" to the variable

最后，函数“show_frame”的主体应该缩进。

编辑：

你的回溯说：

NameError: name 'TakePictureC' is not defined

那是因为行：

screenTake = tk.Button(text='ScreenShot', command = TakePictureC)

说点击底部时调用TakePictureC，但是TakePictureC还没有定义。