c++ - Access violation on a private array inside a class -

for part borrowed code rasterteks dx11 tutorial modified lightly or own use , taste.  getting read access violation while using below inputclass set keystates.  #include "inputclass.h"  inputclass::inputclass() { } inputclass::inputclass(const inputclass& other) { } inputclass::~inputclass() { }  void inputclass::initialize() {     // initialize keys being released , not pressed.     (int = 0; i<256; i++) {         keystate[i] = false;     }      return; }   void inputclass::keydown(unsigned int input) {     // if key pressed save state in key array.     keystate[input] = true;     return; }   void inputclass::keyup(unsigned int input) {     // if key released clear state in key array.     keystate[input] = false;     return; }   bool inputclass::iskeydown(unsigned int input) {     // return state key in (pressed/not pressed).     return keystate[input]; } 

below main callback loop, 1 registered windowclass:

lresult callback wndproc(hwnd hwnd, uint message, wparam wparam, lparam lparam) {     switch (message) {         // message read when window closed     case wm_destroy: {                          postquitmessage(0);                          return 0;     }         // check if window being closed.     case wm_close: {                        postquitmessage(0);                        return 0;     }     default: { return applicationhandle->messagehandler(hwnd, message, wparam, lparam); }     } } 

finally, below secondary message handler part of systemclass:

lresult callback systemclass::messagehandler(hwnd hwnd, uint message, wparam wparam, lparam lparam) {     switch (message) {     case wm_keydown: { input->keydown((unsigned int)wparam); }     case wm_keyup: { input->keyup((unsigned int)wparam); }     default: { return defwindowproc(hwnd, message, wparam, lparam); }     } } 

the exception fired off when code gets switch/case/default list in secondary message handler. if comment these lines out program happily runs of course, no input.

any or clues invaluable. thank time.

try following modification of code:

void inputclass::keydown(unsigned int input) {     if (input < 0 || input > 255)         return;     // if key pressed save state in key array.     keystate[input] = true;     return; }  void inputclass::keyup(unsigned int input) {     if (input < 0 || input > 255)         return;     // if key released clear state in key array.     keystate[input] = false;     return; } 

(since haven't problems in constructor of inputclass, not problem of private status of array)