C代码实现窗体背景色动态渐变效果，类似Flash动画一样慢慢切换，没有用其它的控件，完全VC++代码实现，看上去很不错。希望对朋友们有帮助。-C code to achieve the form background color of the dynamic gradient effects, such as Flash animation slowly switching, did not use other controls, full VC++ code implementation, l