"BitBlt" is a graphics accelerator function. The message is a warning,
not an error. It tells that graphics acceleration is not available, for
example when the screensaver is active or you are working via a remote
desktop connection.
“BitBlt”是一个图形加速器的功能。消息是一个警告，不是一个错误。它讲述的是图形加速是不可用的，因为
当屏幕保护程序是有效的或你的工作是通过远程桌面连接qt: flush: BitBlt failed
原文：http://www.cnblogs.com/lvdongjie/p/4235333.html
