谁能告诉我为什么此代码在删除时崩溃. [英] Can anybody tell me why this code crashes at delete.

问题描述

char * day =新的char [2];
char * tempMonth = NULL;
char * tempDay = NULL;
char temp [12];

strcpy_s(temp，sizeof(temp)，"12-12");
tempDay = strtok_s(temp，-"，& tempMonth);

strcpy_s(day，sizeof(day)，tempDay);

delete [] day;

char *day = new char[2];
char *tempMonth = NULL;
char *tempDay = NULL;
char temp[12];

strcpy_s(temp,sizeof(temp),"12-12");
tempDay = strtok_s(temp,"-",&tempMonth);

strcpy_s(day,sizeof(day),tempDay);

delete[] day;

推荐答案

乍一看，我会说误解sizeof是您的问题. sizeof char *将为您提供指针的大小，即在32位系统上为4个字节.将4个字节复制到2个字节的缓冲区中，您很幸运能在delete []崩溃之前得到尽可能多的帮助:-)
检查文档中的sizeof.

At first glance I woud say misunderstanding sizeof is your problem. sizeof a char* will give you the size of a pointer, i.e. 4 bytes on a 32bit system. Copy 4 bytes into a 2 byte buffer and you''re lucky to get as far as the delete[] before it crashes :-)
Check the docs for sizeof.

请记住，字符串以零结尾！您应该始终在字符串末尾为\ 0保留一个字符.换句话说-更改:

Remember that strings are zero terminated! You should always reserve one more character for the \0 at the end of the string. In other words - change:

char *day = new char[2];

至:

to:

char *day = new char[3];

那应该做.

顺便说一句，我不同意strogg-恕我直言，即使没有要调用的析构函数，将new []与delete []配对也是一个好主意.

That should do it.

BTW I disagree with strogg - IMHO it''s always a good idea to pair new[] with delete[] - even if there are no destructors to call.

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