HEAP[handmadehero.exe]: Heap block at 00D24AF8 modified at 00D24B19 past requested size of 19

#include <windows.h>

// define the windows callback messaging responses
LRESULT CALLBACK MainWindowCallback( HWND Window,UINT Message,WPARAM WParam,LPARAM LParam)	
{

	LRESULT Result = 0;

	switch(Message)
	{
	case WM_SIZE:
		{
			// use of block is to prevent var scope leak
			OutputDebugStringA("WM_SIZE\n");
		}break;
	case WM_PAINT:
	{
		PAINTSTRUCT Paint;
		HDC DeviceContext = BeginPaint(Window, &Paint);
		int X = Paint.rcPaint.left;
		int Y = Paint.rcPaint.top;
		int Height = Paint.rcPaint.bottom - Paint.rcPaint.top;
		int Width = Paint.rcPaint.right - Paint.rcPaint.left;
		static DWORD Operation = WHITENESS;
		PatBlt(DeviceContext, X, Y, Width, Height, Operation);
		if (Operation == WHITENESS)
		{
			Operation = BLACKNESS;
		}
		else
		{
			Operation = WHITENESS;
		}
		EndPaint(Window, &Paint);


		
		
		OutputDebugStringA("WM_SIZE\n");
	}break;

		case WM_DESTROY:
		{
			PostQuitMessage(0);
			OutputDebugStringA("PostQuitMessage(0) - WM_DESTROY\n");
		}break;

		case WM_CLOSE:
		{
			PostQuitMessage(0);
			OutputDebugStringA("WM_CLOSE\n");
		}break;

		case WM_ACTIVATEAPP: //let's us know if user has clicked and made the window active
		{
			OutputDebugStringA("WM_ACTIVATEAPP\n");
		}break;

		default:
		{
		//	OutputDebugStringA("Default case!\n");
			//this is the catchall LRESULT return to windows, there's a default Windows way to do this
			Result = DefWindowProc(Window, Message, WParam, LParam);
		}break;
	}

	return(Result);

}

// main program entry!
int CALLBACK WinMain(
	HINSTANCE Instance,
	HINSTANCE PrevInstance,
	LPSTR     CmdLine,
	int       CmdShow
	)
{
	// create instance of windowclass and initialize to 0/null
	WNDCLASS WindowClass = {};
	
	//define the window class fields
	//WindowClass.style = CS_OWNDC|CS_HREDRAW|CS_VREDRAW;
	WindowClass.lpfnWndProc = MainWindowCallback; //how window responds to events by passing in a function via pointer, defined above
	WindowClass.hInstance = Instance; // get the windowhandle instance
	//HICON     hIcon; //may be used later
	WindowClass.lpszClassName = "HandMadeHeroWindowClass";

	//MessageBox(0, "This is handmade hero!", "handmade caption", MB_OK | MB_ICONINFORMATION);

	//REGISTERING THE WINDOW CLASS
	
	if (RegisterClassA(&WindowClass))
	{
		HWND WindowHandle = CreateWindowExA(
			0, // extended style, no thanks
			WindowClass.lpszClassName,
			"Handmadehero!",
			WS_VISIBLE | WS_OVERLAPPEDWINDOW,
			CW_USEDEFAULT,
			CW_USEDEFAULT,
			CW_USEDEFAULT,
			CW_USEDEFAULT,
			0,
			0,
			Instance,
			0);
		
		if (WindowHandle)
		{
			
			
			for (;;)
			{
				MSG Message;
				BOOL bMessageResult = GetMessage(&Message, 0, 0, 0);
				
				if (bMessageResult > 0)
				{
					TranslateMessage(&Message);
					DispatchMessage(&Message);
				}
				else
				{
					break;
				}

			}

		}
		else 
		{
			//*TODO: WindowHandle non-existent Log it!
			OutputDebugStringA("WindowHandle non-existent ");
		}
	}
	
	else 
	{
		//*TODO: RegisterClass(&WindowClass) is bad Log it!
		OutputDebugStringA("RegisterClass(&WindowClass) is bad ");
	}
	
	return(0);
}

>	ntdll.dll!_RtlpBreakPointHeap@4()	Unknown
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