Thread: Matrix's, MFC and Member functions

Mmmm, a tasty combination.
First off, I picked up the book 'Visual C++ Bible' and i've read up to about page 200. I wanted to make a few test programs to test what I'd learned so I decided on good old TicTacToe and Connect Four

TicTacToe I finished in about 30 minutes.. while connect four is giving me a small problem involving a 2D array of variable length.

The user enters 2 values, height and width of the board and then clicks new game. Then, I divide the client area up based on these values, and initalize a matrix also based on these values.

Everything works perfectly.. exept when I click new game, it crashes

Here's the code for member function OnNewGame();

Code:

void CConnectFourDlg::OnNewgame() 
{
	m_iGameStarted = 1;
	*m_connectFourArray = new short int[m_iWidth];
	for (int i = 0; i < m_iWidth; i++)
	{
		m_connectFourArray[i] = new short int[m_iHeight];
	}
}

and here's the class declaration

Code:

class CConnectFourDlg : public CDialog
{
// Construction
public:
	bool m_iGameStarted;
	short int **m_connectFourArray;
	CConnectFourDlg(CWnd* pParent = NULL);	// standard constructor

// Dialog Data
	//{{AFX_DATA(CConnectFourDlg)
	enum { IDD = IDD_CONNECTFOUR_DIALOG };
	short	m_iHeight;
	short	m_iWidth;
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CConnectFourDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);	// DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	HICON m_hIcon;

	// Generated message map functions
	//{{AFX_MSG(CConnectFourDlg)
	virtual BOOL OnInitDialog();
	afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
	afx_msg void OnPaint();
	afx_msg HCURSOR OnQueryDragIcon();
	afx_msg void OnNewgame();
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

Ahh, you're right again Fordy. Thanks a bunch.

I don't know... it seems to me any combonation would be solvable. Same with rubics cubes, they may seem impossible to get back to same-colors on each side, but it's obviously possible.