Pass variable from python script to C program(command line argument)

Question

I am here with a issue that : I have a GUI (wxpython), it has spinctrl, the output of spinctrl must be sent to c file, which accept command line argument, so whenever i execute c file using subprocess as it accepts value from GUI the spinctrl value must be sent to it instead of manual typing.

My code is:

      ps = "password" 
      var1 = self.sc1.Getvalue()
      var2 = self.sc2.Getvalue()
      subprocess.call(['echo xsxsxs | sudo "./license.exe"', str(ps), str(var1), str(var2)],shell = True)

whenever i run this script it doesnot show output/error :(

if i remove echo xsxsxs| sudo from the line 4 and then execute then it show error: "you must be root user","Invalid password", "segmentation fault".

mgilson · Accepted Answer · 2013-02-15 04:41:51Z

2

Whenever you use shell=True to subprocess.Popen (or one of the convenience wrappers), you should pass a string exactly the way you would type it in your shell, not a list.

from the docs:

If shell is True, it is recommended to pass args as a string rather than as a sequence.

answered Feb 15, 2013 at 4:41

mgilson

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2 Comments

tim warne Over a year ago

I didnot understand your concept. can you please clarify it?

ford Over a year ago

Since your last argument is shell=True, you should build the string for the entire command yourself: cmd = 'echo xsxsxs | sudo "./license.exe" {} {} {}'.format(ps, var1, var2) then subprocess.call(cmd, shell=True)

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