wxpython。需要帮助解决令人困惑的错误

该代码适用于另一台计算机上的其他人，但似乎不适用于我。我正在使用 python 2.7.7。它对另外两个人来说效果很好，但它似乎不喜欢我或我的计算机，因为每当我运行它时，它都会给我一条错误消息。你们有什么感想？

Traceback (most recent call last):
  File "C:\Python27\python projects\client with gui.py", line 43, in <module>
    frame = WindowFrame(None, 'ChatClient')
  File "C:\Python27\python projects\client with gui.py", line 10, in __init__
    self.dc = wx.PaintDC(self.panel)  # <<< This was changed
  File "C:\Python27\python projects\lib\site-packages\wx-3.0-msw\wx\_gdi.py", line 5215, in __init__
    _gdi_.PaintDC_swiginit(self,_gdi_.new_PaintDC(*args, **kwargs))
PyAssertionError: C++ assertion "Assert failure" failed at ..\..\src\msw\dcclient.cpp(277) in wxPaintDCImpl::wxPaintDCImpl(): wxPaintDCImpl may be created only in EVT_PAINT handler!





import socket
import wx

class WindowFrame(wx.Frame):
    def __init__(self, parent, title):
        wx.Frame.__init__(self, parent, title = title, size=(500, 400))
        self.panel=wx.Panel(self)
        self.panel.SetBackgroundColour("#0B3861")
        self.control = wx.TextCtrl(self.panel, style = wx.TE_MULTILINE, size =(410, 28), pos=(0,329))
        self.dc = wx.PaintDC(self.panel)  # <<< This was changed
        # Sets up the socket connection
        self.s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        host = "127.0.0.1"
        port = 6667
        self.s.connect((host,port))

        # creates send button and binds to event
        sendbutton=wx.Button(self.panel, label ="Send", pos =(414,325), size=(65,35))
        self.panel.Bind(wx.EVT_PAINT, self.OnPaint)
        self.Bind(wx.EVT_BUTTON, self.SendPress, sendbutton )

        self.Centre()
        self.Show()

        #Draws white rectangle
    def OnPaint(self, event):
        self.dc.SetPen(wx.Pen('black'))
        self.dc.SetBrush(wx.Brush('white'))
        self.shapeRectangle=self.dc.DrawRectangle(20, 20, 444, 280)
        self.Show(True)


        # Sets the function of the send button
    def SendPress(self, event):
        self.sent = self.control.GetValue()
        self.s.send(self.sent)
        self.control.Clear()
        self.dc.DrawText(self.sent, 0, 300 )
        self.s.close()

if __name__=="__main__":
    app = wx.App(False)
    frame = WindowFrame(None, 'ChatClient')
    app.MainLoop()

运行此代码时，我遇到与您相同的错误。查看下面链接的文档“如果应用程序希望从 EVT_PAINT 事件处理程序中在窗口的客户区上进行绘制，则必须构造 wx.PaintDC。”

http://www.wxpython.org/docs/api/wx.PaintDC-class.html

您会考虑将其更改为客户端 DC 吗？ “如果应用程序希望从 EVT_PAINT 事件外部在窗口的客户区上进行绘制，则必须构造 wx.ClientDC”

http://www.wxpython.org/docs/api/wx.ClientDC-class.html

通常我认为您会在绑定到 EVT_PAINT 事件的方法中创建 PaintDC，我检查了一些代码示例，当我希望查找属性或从 Paint 方法外部影响画布时，我通常似乎使用 ClientDC。

为此我会改变：

self.dc = wx.PaintDC(self.panel)

to:

self.dc = wx.ClientDC(self.panel)

这是您的代码的完整修改版本，使用原始 PaintDC 来执行我认为您正在尝试执行的操作。

import socket
import wx

class WindowFrame(wx.Frame):
    def __init__(self, parent, title):
        wx.Frame.__init__(self, parent, title = title, size=(500, 400))
        self.panel=wx.Panel(self)
        self.panel.SetBackgroundColour("#0B3861")
        self.control = wx.TextCtrl(self.panel, style = wx.TE_MULTILINE, size =(410, 28), pos=(0,329))
        self.textLog = []
        # Sets up the socket connection
        self.s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        host = "127.0.0.1"
        port = 6667
        self.s.connect((host,port))

        # creates send button and binds to event
        sendbutton=wx.Button(self.panel, label ="Send", pos =(414,325), size=(65,35))
        self.panel.Bind(wx.EVT_PAINT, self.OnPaint)
        self.Bind(wx.EVT_BUTTON, self.SendPress, sendbutton )

        self.Centre()
        self.Show()

        #Draws white rectangle
    def OnPaint(self, event):
        dc = wx.PaintDC(self.panel) 
        dc.SetPen(wx.Pen('black'))
        dc.SetBrush(wx.Brush('white'))
        dc.Clear()
        x, y = 20,20
        self.shapeRectangle=dc.DrawRectangle(x, y, 444, 280)
        fnt = dc.GetFont()        
        for i,line in enumerate(self.textLog):
            if i%2:
                dc.SetTextForeground(wx.RED)
            else:
                dc.SetTextForeground(wx.BLUE)
        dc.SetFont(fnt)
            dc.DrawText(line, x, y)
            y += dc.GetCharHeight()

        # Sets the function of the send button
    def SendPress(self, event):
        self.sent = self.control.GetValue()
        self.s.send(self.sent)
        self.control.Clear()
        self.textLog.append(self.sent)
        self.panel.Refresh()
        self.s.close()

if __name__=="__main__":
    app = wx.App(False)
    frame = WindowFrame(None, 'ChatClient')
    app.MainLoop()