问题描述
一个简单的问题：
为什么以下代码没有捕获Access违规读取位置异常？
它崩溃了if（xyz）与Access违规读取位置异常的行。是不是应该赶上它？实际上，它没有。
A quick question:
Why doesn''t the following code catch the Access violation reading location exception?
it crashes on line if ( xyz ) with an Access violation reading location exception. Is not catch supposed to catch it? Practically, it doesnt.
推荐答案
此代码不会在上崩溃语句，如果xyz是指针。 if 语句仅对true或false进行测试，并且不访问指针中的位置。
可能发生的事情是你从未初始化xyz所以它是非零（因此是真的）但包含垃圾值。那会让你失望。
This code shouild not crash on the if statement if xyz is a pointer. The if statement does a test for true or false only and does not access the location in the pointer.
What can happen is that you never initialized xyz so that it is non-zero (hence true) but contains a garbage value. That will bring you down.
我也很惊讶它在if语句中崩溃了。
更容易理解崩溃在xyz-> ID ......
但由于某种原因它在if语句中崩溃了。它肯定是通过这种方式初始化的。
I am surprised too that it crashes at if statement.
it is more understandable crashing at xyz->ID ...
but it crashes at if statement for some reason. It is definitely initialized by the way.
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