[C] Capture some keys pression

[Alhazred]

I'm writing a software and for user input I need to avoid the use of some keys, my actual function is this

char * UserInput(int max, int tipo) {
    ...
	while(!EndInput) {
	    current = getch();
	    switch(current) {

	    case VK_RETURN: //ok, capture enter key and do its job
                ...
                break;

	    case VK_BACK: //ok, capture backspace and do its job
                ...
                break;

            case VK_TAB: //ok, makes TAB key do nothing
                break;

            case VK_INSERT: //Don't capture INS key returns òR as output
                //getch();
                break;
                
	    case 0: //ok, makes functions keys do nothing
                getch();

            case VK_ESCAPE: //ok, capture ESC and do its job
                    ...

            default:
                    ...
                    break;

        } 
    } 
    return buff;
}

In this code is only reported VK_INSERT to not work, but it's the same with VK_PRIOR, VK_NEXT, VK_HOME, VK_DEL, VK_END, VK_LEFT, VK_RIGHT, VK_UP, VK_DOWN
How could I capture these keys to let them do nothing?

[v0id]

You could make a keyboard hook for your program, which handles all the keys being pressed. This shows you how to install a keyboard hook, and disable the PageDown-key using the hook.

[Alhazred]

I've solved by using a:
case -32: getch(); break;