带memset的EXC

带memset的EXC_BAD_ACCESS(EXC_BAD_ACCESS with memset)

获取错误Thread 1: EXC_BAD_ACCESS (code=1, address=0x0)

unsigned char *nkey; memset(nkey, 0x00, 256); // error is here

我用sprintf设置nkey然后我用它作为参数。

没有编译时错误，但运行时会显示错误。 我正在使用Xcode。

Getting error Thread 1: EXC_BAD_ACCESS (code=1, address=0x0)

unsigned char *nkey; memset(nkey, 0x00, 256); // error is here

I am setting nkey with a sprintf then after I use it as a parameter.

There are no compile time errors, but when running it shows that. I am using Xcode.

最满意答案

例如，您首先需要为nkey分配内存

unsigned char *nkey = new unsigned char[256]; // block of 256 uchars

You first need to allocate memory for nkey, for example

unsigned char *nkey = new unsigned char[256]; // block of 256 uchars