How to compare std::string and TCHAR* in an if statement?

Question

I'm new at C++ coding, and I have this code:

std::string user_name = "raso";

// User Name 
TCHAR username[UNLEN + 1];
DWORD username_len = UNLEN + 1;

GetUserName((TCHAR*)username, &username_len);

if (user_name == username)
{
    std::cout << "You found the user name!";
}

It gives me an error. It basically finds the user name of the PC and compares it with the string user_name, but user_name is a std::string and username is a TCHAR* type, right? So, how can I compare both in an if statement?

Answer 1

Don't mix-and-match wide and narrow strings.

If your target name is std::string, use an A version of API: GetUserNameA

Also, your type casting (TCHAR*)username was not needed.

std::string user_name = "raso";

// User Name 
char username[UNLEN + 1];
DWORD username_len = UNLEN;

GetUserNameA(username, &username_len);

if (user_name == username)
{
    std::cout << "You found the user name!";
}