#include "stdafx.h"#include "RectTrackerEx.h"/////////////////////////////////////////////////////////////////////////////// CRectTracker global state// various GDI objects we need to drawAFX_S

只需要重写OnPaint()和OnEraseBkgnd(CDC* pDC)即可OnPaint()代码如下：if (IsIconic()){ CPaintDC dc(this); // 用于绘制的设备上下文 SendMessage(WM_ICONERASEBKGND, reinterpret_cast(dc.GetSafeHdc()), 0); // 使图标在工作区矩形中居中