This implementation is done as a set of related MFC classes, with a reasonably clean interface.
Showing Progress Bar/Icon/Arbitrary drawing in a status bar pane
在状态条窗格中绘制进度条/图标/任意的绘制。实现是作为一套相关的MFC类,具有相当整洁的界面。
来源: http://www.codeguru.com/statusbar/StatusBar.shtml