trycatch
trycatch-
You can catch exceptions with TryCatch , for example
你可以使用TryCatch来捕获异常，如下所示
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If you do have a TryCatch the exception is caught and your code is allowed to continue processing .
如果你设置一个TryCatch，异常就会被捕获，你的代码可以继续执行。
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If the value returned is an empty handle , and you do not have a TryCatch in place , your code must bail out .
如果返回值是一个空句柄，并且你没有正确的设置TryCatch，你的代码就会崩溃。