Run-Time Check Failure #2 - Stack around the variable 'var' was corrupted
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今天调式的时候VC跳出了Run-Time Check Failure #2 - Stack around the variable 'var' was corrupted信息,但选择继续之后程序照旧运行。后来看代码之后发现是数组访问越界,比如我有一个数组 char szbuf[5]; 但用szbuf[5]去访问内存就会出现这个问题。
与这个类似还有new出来的一个空间,如果越界写,delete的时候会crash,出现HEAP CORRUPTION DETECTED:after Normal block(#***) at 0x****.CRT detected that application wrote memory after end of heap buffer.错误。比如下面的程序
char* ptr = new char[3];
ptr[3]= 5;
delete[] ptr;
这是因为new分配内存的时候会在前后加一些信息,如内存长度等信息。如果我们越界写的话就把这些信息破坏了,导致系统不认识这个内存了,delete的时候就出现异常,对于debug版本,我们可以看到在申请的内存前后都有4个fd,对于上面的程序就是fd fd fd fd cd cd cd fd fd fd fd,如果我们把后面的第一个fd改了就会异常了。
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