File: wx.SingleInstanceChecker.1.py

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wxpython4.0 4.0.4%2Bdfsg-2
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        def OnInit(self):

            self.name = "SingleApp-%s" % wx.GetUserId()
            self.instance = wx.SingleInstanceChecker(self.name)

            if self.instance.IsAnotherRunning():
                wx.MessageBox("Another instance is running", "ERROR")
                return False

            frame = SingleAppFrame(None, "SingleApp")
            frame.Show()
            return True