C语言中unsigned char* 和 const char*的互相转换

1.unsigned char*转换成const char*

先将unsigned char*转换成char*，再将char*转换成const char*

unsigned char *pstr；
const char* p = (const char*)(char*)pstr;

2.const char*转换成unsigned char*

const char* p;
unsigned char * pstr = (unsigned char*)p;