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工作学习 / IT技术讨论 / 在VB中，如何判断一个变量是不是Nothing? 我现在用typeof(obj)="Nothing", 看起来很笨。有没有办法让程序暂停一段时间？比如2秒钟？
-miketany(MIKE老狼);
2002-8-11
(#686004@0)
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1,if objSth is nothing then
2, sleep API or
dim dtVar as date
dtVar=dateadd("s", 3, now)
do while now<dtVar
' sleep 3 second
loop
-gugu(GuGu);
2002-8-11
(#686012@0)
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谢谢! 这个sleep方法很管用，就是太占CPU了，循环过程中一直100% :)
-miketany(MIKE老狼);
2002-8-11
(#686029@0)
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你指API 还是指那个循环?
-gugu(GuGu);
2002-8-11
(#686033@0)
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doesn't matter. coz' i used the similar solution before, the loop will not release the message handle to other programs, that's why the cpu usage is 100%
-speed(如风);
2002-8-11
(#686049@0)
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循环过程中可以加Doevents让系统有机会响应用户操作。我只是觉得奇怪，VB中怎么没有简单的函数可以Sleep一段时间呢？我觉得Basic里好像都有
-miketany(MIKE老狼);
2002-8-11
(#686092@0)
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sleep shouldn't occup cpu, but just block current thread, if you use it in work thread, it's perfect.
-bigdesk(nothing);
2002-8-11
(#686159@0)
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yes
-gugu(GuGu);
2002-8-11
(#686246@0)
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sorry没说清楚，我是说用循环来sleep， 不是用sleepAPI。我一直认为在VB中调用Win32API是使程序兼容性稳定性变坏的最好办法，所以我尽量不用
-miketany(MIKE老狼);
2002-8-11
(#686286@0)
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without winapi you can't build magic ui with only poor vb functions. actually winapi has nothing to do the app stabilities, the way how to use it does.
-bigdesk(nothing);
2002-8-11
(#686332@0)
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你想要Magic UI，你用VB干什么？
-miketany(MIKE老狼);
2002-8-11
(#686370@0)
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yes you are right
-bigdesk(nothing);
2002-8-11
(#686387@0)