Error writing registry key c++

[Mario Valentino]

Hello, i have this code
this code read exe's path and create a registry key with the path as value
but he give me an error! why?

error: invalid cast from type 'std::string {aka std::basic_string<char>}' to type 'LPBYTE {aka unsigned char*}

error: cannot convert 'std::string {aka std::basic_string<char>}' to 'const char*' for argument '1' to 'size_t strlen(const char*)

#include <iostream>
#include <windows.h>
using namespace std;

string exePath(){
    string path;
    char buffer[MAX_PATH];
    cout<<"reading path\n";
    GetModuleFileName( NULL, buffer, MAX_PATH );
    string::size_type pos = string( buffer ).find_last_of( "\\/" );
    path=string( buffer ).substr( 0, pos)+"\\chiavi registro.exe";
    return path;

}
int main()
{
    cout<<exePath();

     HKEY key;
        if(RegOpenKey(HKEY_CURRENT_USER,TEXT("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run"),&key)!=ERROR_SUCCESS){

            cout<<"Errore 1\n";
        }
        if(RegSetValueEx(key,TEXT("Startup"),0,REG_SZ,(LPBYTE)exePath(),strlen(exePath())*sizeof(char))!=ERROR_SUCCESS){
            cout<<"Errore 2\n";
             RegCloseKey(key);
        }else{
        cout<<"Success\n";
        }

    return 0;
}

[Thomas1965]

Line 24 must be:
if(RegSetValueEx(key,TEXT("Startup"),0,REG_SZ,(LPBYTE)exePath().c_str(),strlen(exePath().c_str())*sizeof(char))!=ERROR_SUCCESS)

[Mario Valentino]

Yeah Thanks a lot!!!

For people who need it:
this is the working code

#include <iostream>
#include <windows.h>
using namespace std;

string exePath(){
    string path;
    char buffer[MAX_PATH];
    cout<<"reading path\n";
    GetModuleFileName( NULL, buffer, MAX_PATH );
    string::size_type pos = string( buffer ).find_last_of( "\\/" );
    path=string( buffer ).substr( 0, pos)+"\\chiavi registro.exe";
    return path;

}
int main()
{
    cout<<exePath();

     HKEY key;
        if(RegOpenKey(HKEY_CURRENT_USER,TEXT("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run"),&key)!=ERROR_SUCCESS){

            cout<<"Errore 1\n";
        }
        if(RegSetValueEx(key,TEXT("Startup"),0,REG_SZ,(LPBYTE)exePath().c_str(),strlen(exePath().c_str())*sizeof(char))!=ERROR_SUCCESS){
            cout<<"Errore 2\n";
             RegCloseKey(key);
        }else{
        cout<<"Success\n";
        }

    return 0;
}