一个VC++如何使用滑块的演示实例，拖动滑块可改变数值，文本框内的数值可以显现出来这一功能，滑块使用相当广泛，希望初学者参考一下。-A VC++ how to use the demo instance of the slider, drag the slider to change the value, the value of the text box can be revealed this function, the use of a wide range of slider begin