无法从'const char [3]'转换为'char *'x100000（Qt Creator C ++ Windows 32） [英] cannot convert from 'const char [3]' to 'char *' x100000 (Qt Creator C++ Windows 32)

问题描述

五分钟前，当我轻按f5并出现102个错误时，一切工作正常：

Everything was working fine just five minutes ago when I tapped f5 and got 102 errors:

error: C2440: 'initializing' : cannot convert from 'const char [17]' to 'char *'
Conversion from string literal loses const qualifier (see /Zc:strictStrings)

该特定行在第30行：

char* hexchars = "0123456789ABCDEF";

我至少有一个星期没有碰到错误所在的文件。通常，我通常会说我不小心更改了编译args中的某些内容，但是自从它开始出现错误之前就没有打开设置。

I haven't touched the file the errors are in for at least a week. I'd normally say I accidentally changed something in the compile args or something, but I haven't opened settings since much before it started erroring.

有什么想法吗？我一定心不在changed地更改了某些设置，但我真的不记得想过嗯，我刚刚做了什么？

Any ideas? I must have absentmindedly changed some setting but I really can't remember thinking "uh oh what did I just do?"

推荐答案

当您使用这样的代码

char *astring2 = "some letters";

C ++（和C）将其放入只读存储器。即使它不是const，也不能修改用文字初始化的char指针的内容。

C++ (and C) puts that into read only memory. You can not modify the contents of a char pointer initialized with a literal even if it is not const.

此外，您也不能更改指针的地址，因为它会导致

Also you can not change the address of the pointer because it will cause a memory leak due to the rule above.

但是，除非您将其设为const，否则不会遵循该规则：

This, however, does not follow that rule UNLESS you make it const:

char astring[] = "some letters that can be changed";
char *ptrToString = astring; //work
astring2 = astring //not work

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