https://msdn.microsoft.com/library/7ffyb1kb%28v=vs.110%29.aspx
两个构造技术的示例
下面简要的示例演示构造钢笔对象两个方法:
// One-stage
CPen myPen1(PS_DOT, 5, RGB(0,0,0));
// Two-stage: first construct the pen
CPen myPen2;
// Then initialize it
if(myPen2.CreatePen(PS_DOT, 5, RGB(0,0,0)))
{
// Use the pen
}