subprocess.Popen在python中提供实时反馈

时间:2014-02-07 14:05:10

标签: python command-line wxpython subprocess

我在运行命令行应用程序的python脚本中有以下命令,该应用程序当前正在后台运行“盲目”。如果我从命令行,mac或PC运行此命令,我会实时读取该应用程序的运行情况,因为它运行40分钟+并在运行时报告各种不同的信息。目前正如我所说,它运行盲目,并在python的读数结束时给我所有的信息,但我希望它基本上打开命令行并运行所以我可以实时看到所有信息,但我可以'找到一种方法来做到这一点。这是我使用subprocess.Popen的当前代码。还有其他方法吗?

command1 = transporterLink + " -m verify -f " + indir1 + " -u " + username + " -p " + password + " -o " + indir1 + "\\VerifyLog.txt -s " + provider1 + " -v eXtreme"
        process = subprocess.Popen(command1, stdout=subprocess.PIPE, shell=True)

2 个答案:

答案 0 :(得分:1)

几年前我写过这篇文章,但我认为我没有把这篇文章做得很好:

基本上你需要重定向stdout。我通常做这样的事情:

class RedirectText:
    def __init__(self,aWxTextCtrl):
        self.out=aWxTextCtrl

    def write(self,string):
        self.out.WriteText(string)

然后在我的实际wx课程中,我在 init 中做了类似的事情:

self.redir=RedirectText(log)
sys.stdout=self.redir

然后当你调用subprocess时,你会做类似这样的事情:

def pingIP(self, ip):
    proc = subprocess.Popen("ping %s" % ip, shell=True, 
                            stdout=subprocess.PIPE) 
    print
    while True:
        line = proc.stdout.readline()                        
        wx.Yield()
        if line.strip() == "":
            pass
        else:
            print line.strip()
        if not line: break
    proc.wait()

请注意wx.Yield()调用。这允许wxPython在我们将行打印到stdout时更新,我们已将其重定向到文本控件。

以下是一种排序示例:

import subprocess
import sys
import wx

class RedirectText:
    def __init__(self,aWxTextCtrl):
        self.out=aWxTextCtrl

    def write(self,string):
        self.out.WriteText(string)

########################################################################
class MyFrame(wx.Frame):
    """"""

    #----------------------------------------------------------------------
    def __init__(self):
        """Constructor"""
        wx.Frame.__init__(self, None, title="Test")
        panel = wx.Panel(self)
        log = wx.TextCtrl(panel, wx.ID_ANY, size=(300,100),
                          style = wx.TE_MULTILINE|wx.TE_READONLY|wx.HSCROLL)
        btn = wx.Button(panel, label="Run")
        btn.Bind(wx.EVT_BUTTON, self.onRun)

        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(log, 1, wx.ALL|wx.EXPAND, 5)
        sizer.Add(btn, 0, wx.ALL|wx.CENTER, 5)
        panel.SetSizer(sizer)

        self.redir=RedirectText(log)
        sys.stdout=self.redir

    #----------------------------------------------------------------------
    def onRun(self, event):
        """"""
        command1 = transporterLink + " -m verify -f " + indir1 + " -u " + username + " -p " + password + " -o " + indir1 + "\\VerifyLog.txt -s " + provider1 + " -v eXtreme"
        process = subprocess.Popen(command1, stdout=subprocess.PIPE, shell=True)
        while True:
            line = process.stdout.readline()
            wx.Yield()
            print line
            if not line:
                break
        process.wait()

#----------------------------------------------------------------------
if __name__ == "__main__":
    app = wx.App(False)
    frame = MyFrame()
    frame.Show()
    app.MainLoop()

答案 1 :(得分:-1)

我通过从Mikes的答案中更改此部分来开始工作,但现在只有当应用程序结束并且输出完成打印行时我的python冻结才出现问题。有什么想法吗?

def onRun(self, event):
    """"""
    command1 = transporterLink + " -m verify -f " + indir1 + " -u " + username + " -p " + password + " -o " + indir1 + "\\VerifyLog.txt -s "
+ provider1 + " -v eXtreme"
    master, slave = pty.openpty()
    process = Popen(command1, shell=True, stdin=PIPE, stdout=slave, stderr=slave, close_fds=True)
    stdout = os.fdopen(master)
    while True:
        line = stdout.readline()
        wx.Yield()
        print line.rstrip()
        if not line:
            break
    process.wait()