利用visual C++函数编程实现自绘制滑块，可以调节滑块背景透明度及滑块本身颜色-create a sider bar by codes

简单的MFC编程，带分析报告、步骤和函数解析，适合入门，拖动滚动条改变编辑框的颜色值.-Simple MFC program with analysis reports, analytical procedures and functions, for entry, drag the scroll bar to change the color value of the edit box.