问题描述
我有一个简单的图形程序,可以在远程树莓派的触摸屏上显示一些指令和触摸按钮。
我不是通过直接执行而是通过SSH连接运行它,因此我的桌面应用程序日志中都有该记录。
我希望在运行脚本的控制台中缺少交互,例如执行某些功能或更改某些变量的值。
那有可能吗?
我不想在TKinter窗口中创建控制台,如alessandro所问: How to embed a terminal in a Tkinter application?
不确定是否应该使用短子进程(如user1941008),但htis似乎过于复杂 Write to terminal in Tkinter GUI
而且我确实不想为此创建一个客户端/服务器设置或中间缓冲区,因为太复杂了,我将不得不重写一些东西以将日志发送到新程序。
#!/usr/bin/env python3
import tkinter as tk
class _tkapp(tk.Frame):
def __init__(self,master=None):
super().__init__(master)
self.master = master
self.pack()
self.create_widgets()
def create_widgets(self):
self.redButton = tk.Button(self,text='Make me red',command=self.paintMeRed)
self.redButton.pack(side='top')
self.blueButton = tk.Button(self,text='Make me blue',command=self.paintMeBlue)
self.blueButton.pack(side='top')
self.quit = tk.Button(self,text='QUIT',fg='red',command=self.master.destroy)
self.quit.pack(side='bottom')
def paintMeRed(self):
tk_root.configure(background='red')
print('user click on RED')
def paintMeBlue(self):
tk_root.configure(background='blue')
print('user click on BLUE')
tk_root = tk.Tk()
tk_root.geometry("200x120")
tk_app = _tkapp(master=tk_root)
tk_app.mainloop()
这使我可以在控制台上看到用户喜欢的内容, 我的目标,也可以从控制台更改颜色
解决方法
这是您问题的答案。我的其他(已删除)答案与您的问题不符。
不幸的是,没有套接字就无法做到,但是我向您的示例添加了一些易于调整的方法(init_remote_execution
,listener
,do_remite_call
和cleanup
可以复制并粘贴到您的实际应用程序中。您只需要改编do_remote_call
方法:
#!/usr/bin/env python3
import socket
import tkinter as tk
from queue import Queue
from threading import Thread
from uuid import uuid1
UDP_HOST = ""
UDP_PORT = 5005
RECV_BUFFER = 1020
class _tkapp(tk.Frame):
def __init__(self,master=None):
super().__init__(master)
self.master = master
self.pack()
self.create_widgets()
self.init_remote_execution()
self.master.protocol("WM_DELETE_WINDOW",self.cleanup) # call cleanup on exit
def init_remote_execution(self):
self.sock = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
self.sock.bind((UDP_HOST,UDP_PORT))
self.endmsg = str(uuid1()) # Random string to stop threads
self.queue = Queue()
self.treads_running = True
self.listener_thread = Thread(target=self.listener)
self.worker_thread = Thread(target=self.do_remote_call)
self.listener_thread.start()
self.worker_thread.start()
def listener(self):
print("listen")
while self.treads_running:
data,addr = self.sock.recvfrom(RECV_BUFFER)
data = data.decode().strip()
print("from {addr}: {data}".format(addr=addr,data=data))
if data == self.endmsg:
self.treads_running = False
self.queue.put(data)
self.sock.close()
def do_remote_call(self):
while self.treads_running:
data = self.queue.get()
if data == self.endmsg:
print("Bye")
elif data == "click RED":
self.paintMeRed()
elif data == "click BLUE":
self.paintMeBlue()
else:
print(">>> unknown command")
def cleanup(self):
print("cleanup")
s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
s.sendto(self.endmsg.encode(),("127.0.0.1",UDP_PORT))
self.listener_thread.join()
self.worker_thread.join()
self.master.destroy()
def create_widgets(self):
self.redButton = tk.Button(self,text="Make me red",command=self.paintMeRed)
self.redButton.pack(side="top")
self.blueButton = tk.Button(self,text="Make me blue",command=self.paintMeBlue)
self.blueButton.pack(side="top")
self.quit = tk.Button(
self,text="QUIT",fg="red",command=self.cleanup
) # call cleanup!!!
self.quit.pack(side="bottom")
def paintMeRed(self):
tk_root.configure(background="red")
print("user click on RED")
def paintMeBlue(self):
tk_root.configure(background="blue")
print("user click on BLUE")
if __name__ == "__main__":
tk_root = tk.Tk()
tk_root.geometry("200x120")
tk_app = _tkapp(master=tk_root)
tk_app.mainloop()
重要的是,您必须在退出按钮上调用cleanup
方法(否则线程将不会停止并且应用程序将挂起)!
现在,您可以通过向树莓派上的端口5005发送udp消息(单击“蓝色”)来“单击”“让我变成蓝色”按钮。
通过对树莓的工具netcat的(你可能需要用apt安装它),你可以发送commad点击蓝色是这样的:
echo "click BLUE" | nc -uw0 127.0.0.1 5005
使用python:
#!/usr/bin/env python3
import socket
sock = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
sock.sendto('click BLUE'.encode(),('127.0.0.1',5005)
sock.close()
您必须在桌面上用树莓派的IP地址切换“ 127.0.0.1”。
,使用python中的cmd
模块,这是一个更简单的版本。此模块可让您为任何事情编写一个repl(读取evaluete打印循环)。
#!/usr/bin/env python3
import cmd
import os
import signal
import tkinter as tk
from threading import Thread
class _tkapp(tk.Frame):
def __init__(self,master=None):
super().__init__(master)
self.master = master
self.pack()
self.create_widgets()
def create_widgets(self):
self.redButton = tk.Button(self,command=self.paintMeBlue)
self.blueButton.pack(side="top")
self.quit = tk.Button(self,command=self.master.destroy)
self.quit.pack(side="bottom")
def paintMeRed(self):
tk_root.configure(background="red")
print("user click on RED")
def paintMeBlue(self):
tk_root.configure(background="blue")
print("user click on BLUE")
class Command(cmd.Cmd):
intro = "Welcome to the repl of the Tk app. Type help or ? to list commands.\n"
prompt = ""
def __init__(self,tkapp):
super().__init__()
self.tkapp = tkapp
# New commands must start with do_ and have one argument.
# The docstring is the help text.
# They must not return anything!
# only the do_quit returns True to indicate that the command loop must stop
def do_paint(self,arg):
"""Paint the background in the color red or blue: PAINT RED"""
clean_arg = arg.strip().lower()
if clean_arg == "red":
self.tkapp.paintMeRed()
elif clean_arg == "blue":
self.tkapp.paintMeBlue()
else:
print("Can't paint the color %s." % clean_arg)
def do_quit(self,arg):
"""Stop the application: QUIT"""
self.tkapp.master.destroy()
return True
if __name__ == "__main__":
tk_root = tk.Tk()
tk_root.geometry("200x120")
tk_app = _tkapp(master=tk_root)
command = Command(tk_app)
command_thread = Thread(target=command.cmdloop)
command_thread.start()
tk_app.mainloop()
os.kill(os.getpid(),signal.SIGTERM)
如果通过ssh运行程序,则可以直接输入命令help
paint
和quit
。 tk应用程序的所有输出也将在此处打印。
只需输入help
或help paint
即可查看运行情况。