这个参数确定缓冲区的大小，用于在例程和发出调用的应用程序之间传递参数。
This parameter determines the size of the buffer used for passing parameters between the routine and the calling application.
示例程序将受益于一些增强功能：如使缓冲区保持同步，或者检查当内容丢失时是否必须重新绘制整个缓冲区。
The example program would benefit from such enhancements as keeping the buffers synchronized or checking if the complete buffer must be redrawn when contents are lost.
示例程序通过记住什么东西没有绘制到当前缓冲区来有意不让缓冲区同步—以便让您更清楚地了解同时工作的多个缓冲区。
The example program purposely does not synchronize buffers by remembering what wasn't drawn to the current buffer — letting you see multiple buffers at work more clearly.
应用推荐