C2440: '=': cannot convert from 'const char [9]' to 'char*'

Question

I am working on a Qt5 project written in C++. Building the project gives an error:

C2440: \'=\': cannot convert from \'const char [9]\' to \'char*\'<

Answer 1

In C++, in contrast to C, string literals are const. So any pointer to such a string literal must be const, too:

const char* port_name = "\\\\.\\COM4";  // OK
// char* port_name = "\\\\.\\COM4";  // Not OK