Solve Crash：ida pro work with pyqt

以前遇到过这个坑，idapython里想用pyqt做界面会有问题，因为idaq本身也是基于qt的，会崩溃
idapython自己的插件接口只能加工具栏图标/ 菜单选项/ 右键菜单项， 好像并不能做出好看的弹窗，用wxpython或者tkinter太复古。

• before

class Ui_Frame:
          ...

if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    Frame = QtGui.QFrame()
    ui = Ui_Frame()
    ui.setupUi(Frame)
    Frame.show()
    sys.exit(app.exec_())

• after

if __name__ == "__main__":
    import sys
    app = QtGui.QApplication.instance()
    if not app:
        app = QtGui.QApplication([])
    Frame = QtGui.QFrame()
    ui = Ui_Frame()
    ui.setupUi(Frame)
    Frame.show()
    app.exec_()

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refer：Bringing IDA PRO plugin writing into 2014