Scrolling Menu is Not Working in c++ - c++

Question

This is the code for my scrolling menu where it display different values based on the 3 vectors, welcomeMenuVector, menuOptionsVector and menuActionVector:
welcomeMenuVector - Save function of title
menuOptionsVector - Save menu options of scrolling menu
menuActionsVector - Save the functions to perform after the menu option is selected
vector<string> menuOptionsVector;
vector<function<void()>> menuActionsVector;
vector<function<void()>> welcomeMenuVector;
void scrollingMenu(){
ShowConsoleCursor(false);
int pointer = 0;
while (true){
system("cls");
SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), 15);
welcomeMenuVector[0]();
for (unsigned int i = 0; i < menuOptionsVector.size(); ++i){
if (i == pointer){
SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), 14);
cout << center("> " + menuOptionsVector[i] + " <" ,getWindowWidth()) <<endl;
}
else{
SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), 15);
cout << center(" " + menuOptionsVector[i] + " ", getWindowWidth()) << endl;
}
}
while (true){
if (GetAsyncKeyState(VK_UP) != 0){
pointer -= 1;
if (pointer == -1){
pointer = menuOptionsVector.size() - 1;
}
break;
}
else if (GetAsyncKeyState(VK_DOWN) != 0){
pointer += 1;
if (pointer == menuOptionsVector.size()){
pointer = 0;
}
break;
}
else if (GetAsyncKeyState(VK_RETURN) != 0){ //when enter key is pressed
menuActionsVector[pointer]();
}
}
Sleep(100);
}
}
I will need to enter menu title, menu options and menu functions into vector before I need to call the scrollingMenu(). Hence, I will have to clear all the 3 vectors before entering values into vectors because there will be values inside as it might be used by another menu earlier.
This is my main page, user page and add user page:
void mainPage(){
clearMenuVectors();
welcomeMenuVector = { [](){mainPageWelcome(); } };
menuOptionsVector = { "Login", "Exit" };
menuActionsVector = {
[](){ userPage(); },
[](){ exit(0); }
};
scrollingMenu();
}
void userPage(){
clearMenuVectors();
welcomeMenuVector = { [](){userPageWelcome(); } };
menuOptionsVector = { "Add User", "Update User", "Delete User", "Exit" };
menuActionsVector = {
[](){ addUsers(); },
[](){ updateUsers(); },
[](){ deleteUsers(); },
[](){ exit(0); }
};
scrollingMenu();
}
void addUsers(){
clearMenuVectors();
welcomeMenuVector = { [](){cout << center("Which type of user would you like to add?", getWindowWidth()) << endl;; } };
menuOptionsVector = { "Add Admin", "Add Scheduler", "Add Professional", "Exit" };
menuActionsVector = {
[](){ /*addUser();*/ },
[](){ /*updateUsers();*/ },
[](){ /*deleteUsers();*/ },
[](){ exit(0); }
};
}
My main page works fine at first, I'm able to move up & down, after hitting enter on the Login menu option, it goes to the userPage, but here comes the problem, when I'm in the userPage, I can still see the menu options of userPage, but when I just move up/down it will then changed the menu options of addUsers (I haven't even hit the enter), even if I dont move up/down I hit enter on Add User option, nothing happens, I'm not sure what is the problem here.

Answer 1

If you change
[](){ /*addUser();*/ },
to
{ cout << "add user option 1" << endl; },
and it writes it continuously then the key is pressed.
GetAsyncKeyState
whether the key is currently up or down. If the most significant bit
is set, the key is down, and if the least significant bit is set, the
key was pressed after the previous call to GetAsyncKeyState.
So you need to check the least significant bit. In this case
if (GetAsyncKeyState(VK_RETURN) != 0)
should be
if (GetAsyncKeyState(VK_RETURN) & 0x1)