Weird Runtime error

mFocusHandler ( the "this" pointer in FocusHandler::requestFocus ) is probably NULL. Remeber to the compiler the line reads "this->mToBeFocused = widget;".

You've already got the debugger pointing at the bad line, now is the time to research how to get a backtrace and inspect various variable values.

Thanks, that fixed it. But I have another runtime error now:

KeyboardEvent InputManager::dequeueKeyboard(){	KeyboardEvent result = mKeyboardQueue.front(); // Right here	mKeyboardQueue.pop();	return result;}

The weird thing is, both result and mKeyboardQueue have values according to the debugger.

	KeyboardEvent result = mKeyboardQueue.front();00416A23  mov         ecx,dword ptr [this] 00416A26  add         ecx,14h 00416A29  call        std::queue<KeyboardEvent,std::deque<KeyboardEvent,std::allocator<KeyboardEvent> > >::front (41509Ah) 00416A2E  mov         ecx,dword ptr [eax] // THIS LINE00416A30  mov         dword ptr [result],ecx 

Quote:

KeyboardEvent result = mKeyboardQueue.front();

If mKeyboardQueue is empty, the result of front() will be undefined. MVS will raise an exception with secure iterators. I don't know what happens without them.

Quote:

When compiling with _SECURE_SCL 1, a runtime error will occur if you attempt to access an element in an empty list. See Checked Iterators for more information.

The thing is...I call if the list is empty before...

while( mInputManager->isKeyQueueEmpty() == false ){	KeyboardEvent keyEvent = mInputManager->dequeueKeyboard();    ...bool InputManager::isKeyQueueEmpty(){	return mKeyboardQueue.empty();}

Harmless bump.

Do you need me to post more code?

Ok...well instead of running the exe externally and let windwos catch the exception, I ran it in debug mode in VC++ 05. It gives me an access violation when I check if the list is empty, instead of when I try to get the item at the front of the list:

0xC0000005: Access violation reading location 0xbaadf031.in <deque>:bool empty() const{	// test if sequence is empty	return (_Mysize == 0); // THIS LINE IS ERROR}		return (_Mysize == 0);00417243  mov         eax,dword ptr [this] 00417246  xor         ecx,ecx 00417248  cmp         dword ptr [eax+10h],0 // HERE

Well in the assembly eax appears to be 0 or sufficiently small that you're access violating. This suggests that the this pointer is null which means that the object you're calling empty on is invalid. Just a guess

ok...but it is a , so I don't know how to init to make it actually something.

Are you sure mInputManager has been allocated?

Aha! THANK YOU!

void Gui::setInputManager( InputManager *inputManager ){	//if( mInputManager == NULL )		mInputManager = inputManager;}

The if statement was preventing the mInputManager from being set. But even if I make mInputManager null in the constructor, it still didn't fix it. So I'll have to leave it commented out for now. Thanks again!