Inheritance diagram for wx.Process:
The objects of this class are used in conjunction with the wx.Execute function. When a wx.Process object is passed to wx.Execute, its OnTerminate virtual method is called when the process terminates. This allows the program to be (asynchronously) notified about the process termination and also retrieve its exit status which is unavailable from wx.Execute in the case of asynchronous execution.
Please note that if the process termination notification is processed by the parent, it is responsible for deleting the wx.Process object which sent it. However, if it is not processed, the object will delete itself and so the library users should only delete those objects whose notifications have been processed (and call Detach for others).
wx.Process also supports IO redirection of the child process. For this, you have to call its Redirect method before passing it to wx.Execute. If the child process was launched successfully, GetInputStream, GetOutputStream and GetErrorStream can then be used to retrieve the streams corresponding to the child process standard output, input and error output respectively.
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Constructs a process object. id is only used in the case you want to use wxPython events. It identifies this object, or another window that will receive the event.
If the parent parameter is not None, it will receive a wx.EVT_END_PROCESS notification event (you should bind the wx.EVT_END_PROCESS event in the parent to handle it) with the given id.
Parameters:
Returns:
Normally, a wx.Process object is deleted by its parent when it receives the notification about the process termination.
However, it might happen that the parent object is destroyed before the external process is terminated (e.g. a window from which this external process was launched is closed by the user) and in this case it should not delete the wx.Process object, but should call Detach() instead.
After the wx.Process object is detached from its parent, no notification events will be sent to the parent and the object will delete itself upon reception of the process termination notification.
Returns True if the given process exists in the system.
Parameters:
Returns:
bool
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Returns an input stream which corresponds to the standard error output (stderr) of the child process.
Returns:
It returns an input stream corresponding to the standard output stream of the subprocess. If it is None, you have not turned on the redirection.
Returns:
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It returns an output stream correspoding to the input stream of the subprocess. If it is None, you have not turned on the redirection.
Returns:
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Returns True if there is data to be read on the child process standard error stream.
Returns:
bool
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Returns True if there is data to be read on the child process standard output stream. This allows to write simple (and extremely inefficient) polling-based code waiting for a better mechanism in future wxWidgets versions.
Returns:
bool
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Returns True if the child process standard output stream is opened.
Returns:
bool
Send the specified signal to the given process.
Parameters:
pid (int): the process id.
signal (int): Possible signal values are:
wx.SIGNONE, wx.SIGKILL and wx.SIGTERM have the same meaning under both Unix and Windows but all the other signals are equivalent to wx.SIGTERM under Windows.
flags (int): The flags parameter can be wx.KILL_NOCHILDREN (the default), or wx.KILL_CHILDREN, in which case the child processes of this process will be killed too. Note that under Unix, for wx.KILL_CHILDREN to work you should have created the process passing wx.EXEC_MAKE_GROUP_LEADER.
Returns one of the following flags:
| Kill Error Flags | Description |
|---|---|
| wx.KILL_OK | no error |
| wx.KILL_BAD_SIGNAL | no such signal |
| wx.KILL_ACCESS_DENIED | permission denied |
| wx.KILL_NO_PROCESS | no such process |
| wx.KILL_ERROR | another, unspecified error |
Returns:
int
It is called when the process with the pid
Parameters:
This static method replaces the standard popen() function: it launches the process specified by the cmd parameter and returns the wx.Process object which can be used to retrieve the streams connected to the standard input, output and error output of the child process.
If the process couldn’t be launched, None is returned.
Parameters:
cmd (string): The command to execute, including optional arguments.
flags (int): The flags to pass to wx.Execute.
Note
wx.EXEC_SYNC should not be used
Returns:
Note
Note that in any case the returned pointer should not be deleted, rather the process object will be destroyed automatically when the child process terminates. This does mean that the child process should be told to quit before the main program exits to avoid memory leaks.
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