Programmatically change WxWidget slider from external process?

Question

I have only the binary of a closed source MS Windows application.

Using the FindWindow [1] and GetClassName [2] functions revealed the class name of the main window of the application: "wxWindow" [3]. Consequently I assume the wxWidgets [4] GUI library was used.

Somewhere in this main window is presumably a "wxSlider" [5] component. My main goal is to control this "wxSlider" from another process. Is this even possible? If yes, how would you approach this problem?

Until now I have tried to circumvent the problem. The "wxSlider" component can be controlled via mouse wheel events [6]. At the moment I am using the "mouse_event" function [7] to simulate these events and control the slider. However, this allows only relative movement and is rather imprecise.

[1] http://msdn.microsoft.com/en-us/library/windows/desktop/ms633499(v=vs.85).aspx
[2] http://msdn.microsoft.com/en-us/library/ms633582(v=VS.85).aspx
[3] http://docs.wxwidgets.org/trunk/classwx_window.html
[4] https://www.wxwidgets.org/
[5] http://docs.wxwidgets.org/trunk/classwx_slider.html
[6] http://docs.wxwidgets.org/trunk/classwx_mouse_event.html
[7] http://msdn.microsoft.com/en-us/library/windows/desktop/ms646260(v=vs.85).aspx

Answer 1

As wxSlider wraps the native up-down control, you should be able to send UDM_SETPOS[32] messages to it to change its value.