[英]Python send websocket message in tkinter
我在python 2.7上的tkinter中发送websocket消息时遇到问题。 我现在有Tkinter的和WebSocket的客户在一个线程中运行,因此它们都同时循环工作,因为看到这里 。 问题是,每当我尝试键入消息并按发送按钮时,都会收到NameError。 我正在使用的websocket客户端在这里 。
这是我的代码:
from Tkinter import *
from websocket import *
from threading import *
master = Tk()
master.wm_title("Websocket Test")
minwidth = master.winfo_screenwidth()/4*3
minheight = master.winfo_screenheight()/4*3
master.minsize(width=minwidth, height=minheight)
master.resizable(0,0)
def sendmsg():
msg = entry.get()
ws.send(msg)
return
text = Text(master)
text.pack(side=TOP, expand=True,fill=BOTH)
entry = Entry(master)
entry.pack(side=BOTTOM, expand=True, fill=BOTH)
button = Button(master, text="SEND", command=sendmsg)
button.pack(side=BOTTOM, expand=True, fill=BOTH)
def on_message(ws, message):
text.insert(END, "Received: "+message+"\n")
print "Received: "+message
return
def on_error(ws, error):
text.insert(END, error+"\n")
print error
return
def on_close(ws):
text.insert(END, "### closed ###\n")
print "### closed ###"
return
def on_open(ws):
ws.send("hello")
ws.send("testing")
return
def connection():
enableTrace(True)
ws = WebSocketApp("ws://echo.websocket.org/", on_message = on_message, on_error = on_error, on_close = on_close)
ws.on_open = on_open
ws.run_forever()
return
t = Thread(target=connection)
t.start()
master.mainloop()
这是我每次尝试发送消息时都会收到的错误消息:
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python27\lib\lib-tk\Tkinter.py", line 1486, in __call__
return self.func(*args)
File "C:\Users\User\Desktop\thing.py", line 14, in sendmsg
ws.send(msg)
NameError: global name 'ws' is not defined
我认为这与线程有关,但是我不确定是什么引起了问题。 websocket on_open函数使用ws.send()成功将消息发送到服务器,但sendmsg函数没有。 感谢所有帮助,因为我是线程技术的新手。
那是因为你
def sendmsg():
msg = entry.get()
ws.send(msg)
return
您需要首先实例化websocket:
def sendmsg():
ws = WebSocketApp("ws://echo.websocket.org/", on_message = on_message, on_error = on_error, on_close = on_close)
msg = entry.get()
ws.send(msg)
return
看起来您稍后会在connection()
创建一个ws实例,然后执行ws = WebSocketApp("ws://echo.websocket.org/", on_message = on_message, on_error = on_error, on_close = on_close)
。 只需确保在使用ws
之前已完成此操作,因为这是定义它的地方。
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