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我似乎已经绊倒了自己，要么不理解类，要么错过了一小段关键代码。python中的Raspberry Pi Framebuffer UI
我想开发一个Raspbian的python应用程序，它会给我一个在framebuffer中运行的UI。它基于为PiCam所做的工作松散，该工作使用类似的UI，因为项目太不相似，所以我不得不重建。我选择了需要工作的片段，并试图重写框架以适应我的需求。我做了所有的工作，直到我试图通过将我的一个def参赛作品放入课堂来清理干净的东西。我不确定我在这里做错了什么，因为我刚开始编写python代码大约3天前，当我开始这个项目。
此代码：
ev = pygame.event.get()
screen.blit(ethdisp,(0,0))
screen.blit(wldisp, (0,1*font.get_linesize()))
这就要求信息制作这里：
class IPdisplay:
def get_ip_address(ifname):
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
return socket.inet_ntoa(fcntl.ioctl(
s.fileno(),
0x8915, # SIOCGIFADDR
struct.pack('256s', ifname[:15])
)[20:24])
font = pygame.font.Font(None, 30)
try:
eth = get_ip_address('eth0')
except IOError:
eth = ('0.0.0.0')
try:
wl = get_ip_address('wlan0')
except IOError:
wl = ("0.0.0.0")
if eth == ("0.0.0.0"):
ethdisp = font.render(ethip, 1, (255,0,0))
else:
ethdisp = font.render(ethip, 1, (0, 255, 0))
screen.blit(ethdisp, (0,0))
ethrect = ethdisp.get_rect()
if wl == ("0.0.0.0"):
wldisp = font.render(wlip, 1, (255, 0, 0))
else:
wldisp = font.render(wlip, 1, (0, 255, 0))
screen.blit(wldisp, (0,1*font.get_linesize()))
wlrect = wldisp.get_rect()
给了我这个错误：
Traceback (most recent call Last):
File "piface.py", line 188, in <module>
screen.blit(ethdisp,(0,0))
NameError: name 'ethdisp' is not defined
我理解错误，我不明白是如何解决它。它调用一个在类中定义的变量，显然它不是全局变量，但我错过了如何使它成为全局变量或调用它的方式。我一直在寻找几个小时，我不确定为什么我找不到答案，或者我不确定要搜索什么。任何帮助，将不胜感激。
如果有人对下面的完整代码感兴趣，并且我正在讨论如果任何人想贡献的话。
import os
import pygame
import time
import random
import socket
import fcntl
import struct
import fnmatch
from pygame.locals import *
os.environ["SDL_FBDEV"] = "/dev/fb1"
if not pygame.font: print 'Warning, fonts disabled'
if not pygame.mixer: print 'Warning, sound disabled'
class Icon:
def __init__(self, name):
self.name = name
try:
self.bitmap = pygame.image.load(iconPath + '/' + name + '.png')
except:
pass
class Button:
def __init__(self, rect, **kwargs):
self.rect = rect # Bounds
self.color = None # Background fill color, if any
self.iconBg = None # Background Icon (atop color fill)
self.iconFg = None # Foreground Icon (atop background)
self.bg = None # Background Icon name
self.fg = None # Foreground Icon name
self.callback = None # Callback function
self.value = None # Value passed to callback
for key, value in kwargs.iteritems():
if key == 'color': self.color = value
elif key == 'bg' : self.bg = value
elif key == 'fg' : self.fg = value
elif key == 'cb' : self.callback = value
elif key == 'value': self.value = value
def selected(self, pos):
x1 = self.rect[0]
y1 = self.rect[1]
x2 = x1 + self.rect[2] - 1
y2 = y1 + self.rect[3] - 1
if ((pos[0] >= x1) and (pos[0] <= x2) and
(pos[1] >= y1) and (pos[1] <= y2)):
if self.callback:
if self.value is None: self.callback()
else: self.callback(self.value)
return True
return False
def draw(self, screen):
if self.color:
screen.fill(self.color, self.rect)
if self.iconBg:
screen.blit(self.iconBg.bitmap,
(self.rect[0]+(self.rect[2]-self.iconBg.bitmap.get_width())/2,
self.rect[1]+(self.rect[3]-self.iconBg.bitmap.get_height())/2))
if self.iconFg:
screen.blit(self.iconFg.bitmap,
(self.rect[0]+(self.rect[2]-self.iconFg.bitmap.get_width())/2,
self.rect[1]+(self.rect[3]-self.iconFg.bitmap.get_height())/2))
def setBg(self, name):
if name is None:
self.iconBg = None
else:
for i in icons:
if name == i.name:
self.iconBg = i
break
# Global stuff -------------------------------------------------------------
screenMode = 3 # Current screen mode; default = viewfinder
iconPath = 'icons' # Subdirectory containing UI bitmaps (PNG format)
icons = [] # This list gets populated at startup
buttons = [
# Screen mode 0 is photo playback
[Button(( 0,188,320, 52), bg='done'),# , cb=doneCallback),
Button(( 0, 0, 80, 52), bg='prev'),# , cb=imageCallback, value=-1),
Button((240, 0, 80, 52), bg='next'),# , cb=imageCallback, value= 1),
Button((88, 70,157,102)), # 'Working' label (when enabled)
Button((148,129, 22, 22)), # Spinner (when enabled)
Button((121, 0, 78, 52), bg='trash',)],# cb=imageCallback, value= 0)],
# Screen mode 1 is delete confirmation
[Button(( 0,35,320, 33), bg='delete'),
Button((32,86,120,100), bg='yn', fg='yes'),
#cb=deleteCallback, value=True),
Button((168,86,120,100), bg='yn', fg='no')],
#cb=deleteCallback, value=False)],
# Screen mode 2 is 'No Images'
[Button((0, 0,320,240)), #cb=doneCallback), # Full screen = button
Button((0,188,320, 52), bg='done'), # Fake 'Done' button
Button((0, 53,320, 80), bg='empty')], # 'Empty' message
# Screen mode 3 is viewfinder/snapshot
[Button(( 0,188,156, 52), bg='gear',),# cb=viewCallback, value=0),
Button((164,188,156, 52), bg='play',),# cb=viewCallback, value=1),
Button(( 0, 0,320,240) ,),# cb=viewCallback, value=2),
Button((88, 51,157,102)), # 'Working' label (when enabled)
Button((148, 110,22, 22))], # Spinner (when enabled)
]
ifname=0
class IPdisplay:
def get_ip_address(ifname):
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
return socket.inet_ntoa(fcntl.ioctl(
s.fileno(),
0x8915, # SIOCGIFADDR
struct.pack('256s', ifname[:15])
)[20:24])
font = pygame.font.Font(None, 30)
try:
eth = get_ip_address('eth0')
except IOError:
eth = ('0.0.0.0')
try:
wl = get_ip_address('wlan0')
except IOError:
wl = ("0.0.0.0")
if eth == ("0.0.0.0"):
ethdisp = font.render(ethip, 1, (255,0,0))
else:
ethdisp = font.render(ethip, 1, (0, 255, 0))
screen.blit(ethdisp, (0,0))
ethrect = ethdisp.get_rect()
if wl == ("0.0.0.0"):
wldisp = font.render(wlip, 1, (255, 0, 0))
else:
wldisp = font.render(wlip, 1, (0, 255, 0))
screen.blit(wldisp, (0,1*font.get_linesize()))
wlrect = wldisp.get_rect()
#pygame.init()
#size = (pygame.display.Info().current_w, pygame.display.Info().current_h)
#screen = pygame.display.set_mode((0,0), pygame.FULLSCREEN)
#pygame.mouse.set_visible(0)
#black = (0, 0, 0)
#screen.fill(black)
#screen.blit(ethdisp,(0,0))
#screen.blit(wldisp, (0,1*font.get_linesize()))
#pygame.display.flip()
os.putenv('SDL_VIDEODRIVER', 'fbcon')
os.putenv('SDL_FBDEV' , '/dev/fb1')
os.putenv('SDL_MOUSEDRV' , 'TSLIB')
os.putenv('SDL_MOUSEDEV' , '/dev/input/touchscreen')
pygame.init()
#scope = IPdisplay()
#scope.getips()
screen = pygame.display.set_mode((0,0), pygame.FULLSCREEN)
# Load all icons at startup.
for file in os.listdir(iconPath):
if fnmatch.fnmatch(file, '*.png'):
icons.append(Icon(file.split('.')[0]))
# Assign Icons to Buttons, now that they're loaded
for s in buttons: # For each screenful of buttons...
for b in s: # For each button on screen...
for i in icons: # For each icon...
if b.bg == i.name: # Compare names; match?
b.iconBg = i # Assign Icon to Button
b.bg = None # Name no longer used; allow garbage collection
if b.fg == i.name:
b.iconFg = i
b.fg = None
while (True): # your main loop
# get all events
ev = pygame.event.get()
screen.blit(ethdisp,(0,0))
screen.blit(wldisp, (0,1*font.get_linesize()))
# proceed events
for event in ev:
# handle MOUSEBUTTONUP
if event.type == pygame.MOUSEBUTTONUP:
pos = pygame.mouse.get_pos()
key = pygame.mouse.get_pressed()
# print pos
# print key
scope = IPdisplay()
scope.__init__()
if event.type == pygame.KEYUP:
if event.key == K_ESCAPE:
print "Escape Pressed"
pygame.quit()
else:
print (event.key)
print "you go nowhere, looping"
for i,b in enumerate(buttons[screenMode]):
b.draw(screen)
pygame.display.update()