如何解决如何使用Flask在Web服务器中制作两个以上的按钮？
我正在尝试运行Pi Web Server来控制执行器。因此，这是有关我要执行的操作的一些详细信息，我的rpi（3B +）通过XBee与Arduino Nano进行通信，rpi是主服务器，nano是从机，通过我想通过使用以下方法在串行端口上编写的Pi Web服务器按钮（总共6个），然后读取用nano编写的内容，最后控制执行器...
我一直在学习本教程：（https://randomnerdtutorials.com/raspberry-pi-web-server-using-flask-to-control-gpios/），并通过进行一些修改来控制执行器，但是我被困在一个事实，就是我从未使用过Flask框架，而且我是Python的新手。所以我只能使执行器在左右移动。
总而言之，我被困住了，因为我真的不知道如何创建两个以上的按钮，我已经尝试过，但是却收到了我不太理解的错误消息：
Traceback (most recent call last):
File "app2.py",line 121,in <module>
@app.route("/<changePin24>/<action24>")
File "/usr/lib/python2.7/dist-packages/flask/app.py",line 1250,in decorator
self.add_url_rule(rule,endpoint,f,**options)
File "/usr/lib/python2.7/dist-packages/flask/app.py",line 66,in wrapper_func
return f(self,*args,**kwargs)
File "/usr/lib/python2.7/dist-packages/flask/app.py",line 1221,in add_url_rule
'existing endpoint function: %s' % endpoint)
AssertionError: View function mapping is overwriting an existing endpoint function: action
----------------------------------------------------------------------------------------------
我在这里向您展示我的代码：
import RPi.GPIO as GPIO
# ajout du pilotage uart
import serial
import time
port = serial.Serial("/dev/ttyS0",baudrate=9600,timeout=3.0)
# /dev/ttyS0 et non AMA0 !
from flask import Flask,render_template,request
app = Flask(__name__)
GPIO.setmode(GPIO.BCM)
pins4 = {
4: {'name': 'GPIO 4','state': GPIO.LOW},}
pins24 = {
24: {'name': 'GPIO 24',}
pins17 = {
17: {'name': 'GPIO 17',}
pins23 = {
23: {'name': 'GPIO 23',}
pins22 = {
22: {'name': 'GPIO 22',}
pins13 = {
13: {'name': 'GPIO 13',}
# Set each pin as an output and make it low:
for pin4 in pins4:
GPIO.setup(pin4,GPIO.OUT)
GPIO.output(pin4,GPIO.LOW)
for pin24 in pins24:
GPIO.setup(pin24,GPIO.OUT)
GPIO.output(pin24,GPIO.LOW)
for pin17 in pins17:
GPIO.setup(pin17,GPIO.OUT)
GPIO.output(pin17,GPIO.LOW)
for pin23 in pins23:
GPIO.setup(pin23,GPIO.OUT)
GPIO.output(pin23,GPIO.LOW)
for pin22 in pins22:
GPIO.setup(pin22,GPIO.OUT)
GPIO.output(pin22,GPIO.LOW)
for pin13 in pins13:
GPIO.setup(pin13,GPIO.OUT)
GPIO.output(pin13,GPIO.LOW)
@app.route("/")
def main():
# For each pin,read the pin state and store it in the pins dictionary:
for pin4 in pins4:
pins4[pin4]['state'] = GPIO.input(pin4)
for pin24 in pins24:
pins24[pin24]['state'] = GPIO.input(pin24)
for pin17 in pins17:
pins17[pin17]['state'] = GPIO.input(pin17)
for pin23 in pins23:
pins23[pin23]['state'] = GPIO.input(pin23)
for pin22 in pins22:
pins22[pin22]['state'] = GPIO.input(pin22)
for pin13 in pins13:
pins13[pin13]['state'] = GPIO.input(pin13)
# Put the pin dictionary into the template data dictionary:
templateData = {
'pins4': pins4,'pins24': pins24,'pins17': pins17,'pins23': pins23,'pins22': pins22,'pins13': pins13,}
# Pass the template data into the template main.html and return it to the user
return render_template('main.html',**templateData)
# The function below is executed when someone requests a URL with the pin number and action in it:
@app.route("/<changePin4>/<action4>")
def action(changePin4,action4):
# Convert the pin from the URL into an integer:
changePin4 = int(changePin4)
#----------------------------------------------------------------------------------------------------
@app.route("/<changePin24>/<action24>")
def action(changePin24,action24):
# Convert the pin from the URL into an integer:
changePin24 = int(changePin24)
#----------------------------------------------------------------------------------------------------
@app.route("/<changePin17>/<action17>")
def action(changePin17,action17):
# Convert the pin from the URL into an integer:
changePin17 = int(changePin17)
#----------------------------------------------------------------------------------------------------
@app.route("/<changePin23>/<action23>")
def action(changePin23,action23):
# Convert the pin from the URL into an integer:
changePin23 = int(changePin23)
#----------------------------------------------------------------------------------------------------
@app.route("/<changePin22>/<action22>")
def action(changePin22,action22):
# Convert the pin from the URL into an integer:
changePin22 = int(changePin22)
#----------------------------------------------------------------------------------------------------
# The function below is executed when someone requests a URL with the pin number and action in it:
@app.route("/<changePin13>/<action13>")
def action(changePin13,action13):
# Convert the pin from the URL into an integer:
changePin13 = int(changePin13)
#----------------------------------------------------------------------------------------------------
# Get the device name for the pin being changed:
deviceName4 = pins4[changePin4]['name']
deviceName24 = pins24[changePin24]['name']
deviceName17 = pins17[changePin17]['name']
deviceName23 = pins23[changePin23]['name']
deviceName22 = pins22[changePin22]['name']
deviceName13 = pins13[changePin13]['name']
# --------------------------------------------ACTIONNEUR HORIZONTAL---------------------------------
# Change the direction of the Actuator plugged on PWMA
# If the action part of the URL is "on," execute the code indented below:
if action4 == "on":
# Set the pin high:
GPIO.output(4,GPIO.HIGH)
# Save the status message to be passed into the template:
message = "Turned " + deviceName4 + " on."
port.write("HD")
# horizontal right
if action4 == "off":
GPIO.output(4,GPIO.LOW)
message = "Turned " + deviceName4 + " off."
port.write("SH")
# stop
# ---------------------------------------------------------------------------------------------------
if action24 == "on":
# Set the pin high:
GPIO.output(24,GPIO.HIGH)
# Save the status message to be passed into the template:
message = "Turned " + deviceName24 + " on."
port.write("HG")
# horizontal left
if action24 == "off":
GPIO.output(24,GPIO.LOW)
message = "Turned " + deviceName24 + " off."
port.write("SH")
#stop
#----------------------------------------------ACTIONNEUR VERTICAL-----------------------------------------------
#Change the direction of the actuator plugged on PWMB
if action17 == "on":
# Set the pin high:
GPIO.output(17,GPIO.HIGH)
# Save the status message to be passed into the template:
message = "Turned " + deviceName17 + " on."
port.write("VH")
#vertical up
if action17 == "off":
GPIO.output(17,GPIO.LOW)
message = "Turned " + deviceName17 + " off."
port.write("SV")
#stop
#---------------------------------------------------------------------------------------------------
#Change the direction of the actuator plugged on PWMB
if action23 == "on":
# Set the pin high:
GPIO.output(23,GPIO.HIGH)
# Save the status message to be passed into the template:
message = "Turned " + deviceName23 + " on."
port.write("VB")
#vertical down
if action23 == "off":
GPIO.output(23,GPIO.LOW)
message = "Turned " + deviceName23 + " off."
port.write("SV")
#stop
#---------------------------------------------WHERE WE SET MOTOR'S SPEED--------------------------------------------
# Change the speed of PWM ===> Pulse Width Modulation
if action22 == "on":
# Set the pin high:
GPIO.output(22,GPIO.HIGH)
# Save the status message to be passed into the template:
message = "Turned " + deviceName22 + " on."
port.write("PWMmoyen")
# Middle speed motor
if action22 == "off":
GPIO.output(22,GPIO.LOW)
message = "Turned " + deviceName22 + " off."
port.write("SPWM")
# stop
# ---------------------------------------------------------------------------------------------------
# Change the speed of PWM ===> Pulse Width Modulation
if action13 == "on":
# Set the pin high:
GPIO.output(13,GPIO.HIGH)
# Save the status message to be passed into the template:
message = "Turned " + deviceName13 + " on."
port.write("PWMmax")
# Middle speed motor
if action13 == "off":
GPIO.output(13,GPIO.LOW)
message = "Turned " + deviceName13 + " off."
port.write("SPWM")
# stop
# ---------------------------------------------------------------------------------------------------
# For each pin,read the pin state and store it in the pins dictionary:
for pin4 in pins4:
pins4[pin4]['state'] = GPIO.input(pin4)
for pin24 in pins24:
pins24[pin24]['state'] = GPIO.input(pin24)
for pin17 in pins17:
pins17[pin17]['state'] = GPIO.input(pin17)
for pin23 in pins23:
pins23[pin23]['state'] = GPIO.input(pin23)
for pin22 in pins22:
pins22[pin22]['state'] = GPIO.input(pin22)
for pin13 in pins13:
pins13[pin13]['state'] = GPIO.input(pin13)
#put pin's state in data dictionary:
templateData = {
'pins4': pins4,}
return render_template('main.html',**templateData)
if __name__ == "__main__":
app.run(host='0.0.0.0',port=80,debug=True)
解决方法
错误是因为所有功能使用相同的名称：def action(changePinxx,actionxx):
每个视图的功能必须具有不同的名称。接下来，我们可以讨论不使用所有不同的功能。
这些网址：
/foo/bar
/hey/there
没有办法知道去哪里。将它们全部放在一个函数中：
@app.route("/<number>/<changePin>/<action>")
def action(number,changePin,action):
changePin = int(changePin)
# now do something with changePin #number
然后，处理您的字典：
pins = {
4: {'name': 'GPIO 4','state': GPIO.LOW},24: {'name': 'GPIO 24',etc.
}
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