判断平台可以直接sys.platform
4月20日更新:
判断平台可以直接利用函数os.environ.get('OS')或者os.environ['OS']会返回操作系统名称.
4月1日更新:
使用os.sep,可以表示文件路径分隔符,Python会自动根据平台选择/(linux,unix)或者\\(windows)
这是为了学习wxPython而编写的一个QR Code Generator程序，
可以把输入的信息保存成图片（png，jpg，gif）格式。
QR Code目前已经有很多应用，下次买pepsi的时候看看上面有个黑色的方块就是了,没有注意coca是不是也有。
做成的大概样子就是左边的样子了：
代码如下：(很不幸，PyQrcodec模块在windows下工作不了，看了作者主页的解决方法，只在ubuntu下解决了）
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#!/usr/bin/env python
#
# QrGenerate.py
#
# Copyright 2009 daniel
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
import os
import wx
import PyQrcodec
ID_New = 101
ID_Encode = 102
ID_Decode = 103
ID_Exit = 104
ID_About = 201
ID_Help = 202
class QrGenerate(wx.App):
def OnInit(self):
frame = BasicFrame(None, -1, "QrGenerator - Generate QR Code for you")
#~ frame.Show(True)
frame.CentreOnScreen()
frame.Show(True)
#~ one way to bind menu items and event
frame.Connect(ID_New, -1,
wx.wxEVT_COMMAND_MENU_SELECTED, frame.OnNew)
frame.Connect(ID_Encode, -1,
wx.wxEVT_COMMAND_MENU_SELECTED, frame.OnEncode)
frame.Connect(ID_Decode, -1,
wx.wxEVT_COMMAND_MENU_SELECTED, frame.OnDecode)
frame.Connect(ID_Exit, -1,
wx.wxEVT_COMMAND_MENU_SELECTED, frame.OnExit)
frame.Connect(ID_Help, -1,
wx.wxEVT_COMMAND_MENU_SELECTED, frame.OnHelp)
frame.Connect(ID_About, -1,
wx.wxEVT_COMMAND_MENU_SELECTED, frame.OnAbout)
self.SetTopWindow(frame)
return True;
##---------------------------------------
class BasicFrame(wx.Frame):
def __init__(self, parent, ID, title):
wx.Frame.__init__(self, parent, ID, title,
wx.DefaultPosition, wx.Size(450,300))
self.CreateStatusBar()
self.SetStatusText("QrGenerator - Generate QR Code for you")
#~ menus start here
menu1 = wx.Menu()
menu1.Append(ID_New,
"&New", "Create new QR Code picture")
menu1.Append(ID_Encode,
"E&ncode", "Generate the QR picture with current string")
menu1.Append(ID_Decode,
"&Decode", "Decode the information from a picture file")
menu1.AppendSeparator()
menu1.Append(ID_Exit,
"&Exit", "Terminate program")
#~ add it to the menubar
menuBar = wx.MenuBar()
menuBar.Append(menu1, "&File")
#~ add another menu
menu2 = wx.Menu()
menu2.Append(ID_Help,
"&Help", "See more about the usage...")
menu2.AppendSeparator()
menu2.Append(ID_About,
"&About", "More information about this program")
menuBar.Append(menu2, "&Help")
#~ set menubar
self.SetMenuBar(menuBar)
#~ another way to bind menu items and event
#~ wx.EVT_MENU(self, ID_ABOUT, self.OnAbout)
#~ ...
#~ set textbox
self.TxtInfo = wx.TextCtrl(self, 1, style=wx.TE_MULTILINE)
#~ set buttons
self.buttons = []
self.buttons.append(wx.Button(self, id=1, label="&Clear"))
self.Bind(wx.EVT_BUTTON, self.OnClear,self.buttons[len(self.buttons)-1])
self.buttons[len(self.buttons)-1].SetToolTip(wx.ToolTip('Clear the input aera'))
self.buttons.append(wx.Button(self, id=2, label="&Encode"))
self.Bind(wx.EVT_BUTTON, self.OnEncode,self.buttons[len(self.buttons)-1])
self.buttons[len(self.buttons)-1].SetToolTip(wx.ToolTip('Generate the QR picture with current string'))
self.buttons.append(wx.Button(self, id=3, label="&Decode"))
self.Bind(wx.EVT_BUTTON, self.OnDecode,self.buttons[len(self.buttons)-1])
self.buttons[len(self.buttons)-1].SetToolTip(wx.ToolTip('Decode the information from a picture file'))
self.buttons.append(wx.Button(self, id=4, label="&Exit"))
self.Bind(wx.EVT_BUTTON, self.OnExit,self.buttons[len(self.buttons)-1])
self.buttons[len(self.buttons)-1].SetToolTip(wx.ToolTip('Terminate program'))
#~ set sizer
self.sizer2 = wx.BoxSizer(wx.HORIZONTAL)
for i in self.buttons:
self.sizer2.Add(i,1,wx.EXPAND)
self.sizer = wx.BoxSizer(wx.VERTICAL)
self.sizer.Add(self.TxtInfo,1,wx.EXPAND)
self.sizer.Add(self.sizer2,0,wx.EXPAND)
#~ Layout sizers
self.SetSizer(self.sizer)
self.SetAutoLayout(1)
#~ self.sizer.Fit(self)
def OnNew(self, event):
if len(self.TxtInfo.GetValue())!=0:
dlg = wx.MessageDialog(self, """The input aera is not empty,\nare you sure?""",
'QrGenerator',wx.YES_NO | wx.ICON_QUESTION)
if dlg.ShowModal()==wx.ID_YES: #choose OK
self.TxtInfo.Clear()
else:
self.TxtInfo.Clear()
def OnClear(self, event):
self.TxtInfo.Clear()
def OnEncode(self, event):
if len(self.TxtInfo.GetValue())!=0:
dlg = wx.FileDialog(self,'Please specify the file name:',
'','','*.jpg;*.gif;*.png', wx.SAVE)
if dlg.ShowModal() == wx.ID_OK:
#~ default format png, you can choose from png or jpg or gif
self.filename = ('.' in dlg.GetFilename()) \
and dlg.GetFilename() or dlg.GetFilename()+'.png'
self.dirname = (dlg.GetDirectory()[len(dlg.GetDirectory())-1]=='/') \
and dlg.GetDirectory() or dlg.GetDirectory()+'/'
size, image = PyQrcodec.encode(self.TxtInfo.GetValue())
image.save(self.dirname+'/'+self.filename)
#~ print '%s, %s' % (self.TxtInfo.GetValue(), self.dirname+'/'+self.filename)
self.SetStatusText("Image has been saved")
def OnDecode(self, event):
dlg = wx.FileDialog(self, 'Please specify the file name:',
'','','*.jpg;*.gif;*png', wx.OPEN)
if dlg.ShowModal() == wx.ID_OK:
if len(dlg.GetFilename())!=0:
self.filename = dlg.GetFilename()
self.dirname = (dlg.GetDirectory()[len(dlg.GetDirectory())-1]=='/') \
and dlg.GetDirectory() or dlg.GetDirectory()+'/'
print self.dirname+self.filename
#~ choose file
status, string = PyQrcodec.decode(self.dirname+self.filename)
if status:
self.TxtInfo.SetValue(string)
## dlg = wx.MessageDialog(self, string,
## "QR Code Information", wx.OK | wx.ICON_INFORMATION)
## dlg.ShowModal()
## dlg.Destroy()
self.SetStatusText("Information has been decoded")
else:
dlg = wx.MessageDialog(self, "There's an ERROR happened!",
"QR Code Information", wx.OK | wx.ICON_ERROR)
dlg.ShowModal()
dlg.Destroy()
def OnExit(self, event):
self.Close(True)
def OnHelp(self, event):
dlg = wx.MessageDialog(self, "If you want to know more about QR Code, \
Please visit: \nhttp://en.wikipedia.org/wiki/QR_Code","QrGenerator - Help", wx.OK | wx.ICON_INFORMATION)
dlg.ShowModal()
dlg.Destroy()
def OnAbout(self, event):
dlg = wx.MessageDialog(self, "This is a simple programme for generating QR code as a picture.\nFor more information \
about QR code, please visit wetsite: \n\nhttp://en.wikipedia.org/wiki/QR_Code",
"About QrGenerator", wx.OK | wx.ICON_INFORMATION)
dlg.ShowModal()
dlg.Destroy()
#~ main loop
app = QrGenerate(0)
app.MainLoop()
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