How do I get the trackbar value?

I feel a little silly askin开发者_StackOverflow中文版g this, seems pretty simple but I can't find the solution anywhere. I have a trackbar made in visual studio 2008 and I want to use it to adjust an image threshold but I can't find the code to retrieve the sliders/markers position. Any help would be much appreciated and I am using C++

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For raw Win32, send the trackbar a TBM_GETPOS message.

Trackbar messages: http://msdn.microsoft.com/en-us/library/ff486075%28VS.85%29.aspx