Adding string to registry path regopenkeyex

Question

Hey so let's say this is the code :

HKEY hk;
long n = RegOpenKeyEx(HKEY_LOCAL_MACHINE,L"SOFTWARE\\",
                  0,KEY_QUERY_VALUE | KEY_WOW64_64KEY, &hk );
if ( n == ERROR_SUCCESS ) {
    cout << "Found ! " << endl;
}
else {
    cout << "Failed with value " << n << endl;
}
RegCloseKey(hk);

So I have a variable string that i need to add to the path that might looks like this :

 string s = "test";

How to make L"SOFTWARE\\" + s as a path?

Thank you

Answer 1

I assume you tried:

long n = RegOpenKeyEx(HKEY_LOCAL_MACHINE, L"SOFTWARE\\" + s, ... );

Which probably gave you a compiler warning. Since you need to add a variable string to the path, you can use:

const std::string sFullPath = "SOFTWARE\\" + s;
long n = RegOpenKeyEx(HKEY_LOCAL_MACHINE, sFullPath.c_str(), 0, KEY_QUERY_VALUE | KEY_WOW64_64KEY, &hk);

This works because RegOpenKeyEx takes a const char* as its argument.