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So I look at C++/Tk for as a GUI library. I see “lots” of examples – 6. I like its style but I do not see how to create a slider/trackbar. I want such a trackbar that on its value change to have my function called and tb value sent to it. How to do such thing with C++/Tk?
You want a scale widget (which should be enough that you can find it in the docs) and you need an extra callback function which takes no arguments, reads the current value from the scale, and dispatches to your real function. That extra callback function will be configured into the scale via
-command, much as the existing examples for buttons in the docs show. Or you could roll the code to read the value from the scale into your main callback function; your call there…