virtual void OnInitCmdLine(wxCmdLineParser& parser);
virtual bool OnCmdLineParsed(wxCmdLineParser& parser);
virtual bool OnCmdLineHelp(wxCmdLineParser& parser);
virtual bool OnCmdLineError(wxCmdLineParser& parser);

 
#ifndef GUIAPP_H
#define GUIAPP_H
 
#include <wx/app.h>
 
class GUIApp : public wxApp
{
    public:
        virtual bool OnInit();
        virtual void OnInitCmdLine(wxCmdLineParser& parser);
        virtual bool OnCmdLineParsed(wxCmdLineParser& parser);
 
    private:
        wxString m_PythonEnvPath;
};
 
#endif // GUIAPP_H
 
 

 
#ifdef WX_PRECOMP
#include "wx_pch.h"
#endif
 
#ifdef __BORLANDC__
#pragma hdrstop
#endif //__BORLANDC__
 
#include <wx/utils.h> // GetEnv
#include <wx/cmdline.h>
 
#include "GUIApp.h"
#include "GUIMain.h"
 
// https://wiki.wxwidgets.org/Command-Line_Arguments
static const wxCmdLineEntryDesc g_cmdLineDesc [] =
{
     { wxCMD_LINE_SWITCH, _("h"), _("help"), _("displays help on the command line parameters"), wxCMD_LINE_VAL_NONE, wxCMD_LINE_OPTION_HELP },
     { wxCMD_LINE_OPTION, _("e"), _("env"), _("Python envar folder Example: /home/asterix/project1/venv"), wxCMD_LINE_VAL_STRING, wxCMD_LINE_PARAM_OPTIONAL },
     { wxCMD_LINE_NONE }
};
 
IMPLEMENT_APP(GUIApp);
 
bool GUIApp::OnInit()
{
    wxApp::OnInit();
 
    GUIFrame* frame = new GUIFrame(0L, _("wxWidgets Application Template"), m_PythonEnvPath);
 
    frame->Show();
 
    return true;
}
 
void GUIApp::OnInitCmdLine(wxCmdLineParser& parser)
{
    parser.SetDesc(g_cmdLineDesc);
    // must refuse '/' as parameter starter or cannot use "/path" style paths
    parser.SetSwitchChars(wxT("-"));
}
 
bool GUIApp::OnCmdLineParsed(wxCmdLineParser& parser)
{
    if(!parser.Found(_("e"), &m_PythonEnvPath) && !parser.Found(_("env"), &m_PythonEnvPath) )
    {
        if(!wxGetEnv("PYTHONENV_PATH", &m_PythonEnvPath));
        {
            m_PythonEnvPath = "";
        }
    }
    return true;
}

$app -e"/home/suryavarman/project1/venv"

$app -f"/home/suryavarman/project1/venv"

Unknown option 'f'
Usage: GUI [-h] [-e <str>]
  -h, --help            displays help on the command line parameters
  -e, --env=<str>       Python envar folder Example: /home/asterix/project1/venv