Adding Controls At Runtime with MFC.

burtlo · October 24th, 2006, 05:48 PM

Most every example in the book has the user create a control through the visual editor for MFC.

Every answer I've attempted to google for gives the advive of creating all the controls in the visual editor and hide them until they are needed.

However, my problem is that the number of controls I want is dynamic at run-time. I attempted to add a button to the dialog box through the following code:

Code:

class CVnRecoveryDlg : public CDialog
{
// Construction
public:
    CVnRecoveryDlg(CWnd* pParent = NULL);    // standard constructor
    CButton *pButton;

// Other Code... //

}


CVnRecoveryDlg::CVnRecoveryDlg(CWnd* pParent /*=NULL*/)
    : CDialog(CVnRecoveryDlg::IDD, pParent)
{
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);

    pButton = new CButton();

}


BOOL CVnRecoveryDlg::OnInitDialog()
{
    CDialog::OnInitDialog();

    // Set the icon for this dialog.  The framework does this automatically
    //  when the application's main window is not a dialog
    SetIcon(m_hIcon, TRUE);            // Set big icon
    SetIcon(m_hIcon, FALSE);        // Set small icon

    // TODO: Add extra initialization here
    pButton->Create(_TEXT("&Button Name"), BS_TEXT | BS_CENTER, CRect(20,20,250,20), this, 0x302);


    return TRUE;  // return TRUE  unless you set the focus to a control
}

anddo · October 10th, 2007, 07:06 AM

But how do you catch messages to the button that you added at runtime? ( for example when it is clicked)

Cheers

anddo · October 13th, 2007, 06:36 AM

Here is some snippet of code regarding dynamic creation of buttons (at runtime):

BOOL CSubmarinesGUIDlg::CreateDynamicButtons()
{
    int numberOfButton = 1100;
    CWnd *w=CWnd::FromHandle(GetSafeHwnd());
    matrix = new CBitmapButton**[maxx];
    for (int k = 0; k < maxx; k++)
        matrix[k] = new CBitmapButton*[maxy];

    for (int i=1;i<=maxx;i++)
        for (int j=1; j<=maxy; j++)
        {
            CPoint p;
            p.SetPoint(j*50,i*50);
            CBitmapButton* btn = new CBitmapButton();
            btn->Create(NULL,WS_CHILD|WS_VISIBLE|BS_OWNERDRAW,CRec t(0+p.x,0+p.y,40+p.x,20+p.y),w ,numberOfButton);
            btn->LoadBitmaps(IDB_BITMAP1,IDB_BITMAP1,IDB_BITMAP1 );
            matrix[i-1][j-1] = btn;
            numberOfButton++;
        }
    return TRUE;
}

Here is how to catch the click messages:

LRESULT CSubmarinesGUIDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
    if ((message == WM_COMMAND)) {
        if (wParam>=1100) //ids for our buttons
        {
            int id = (int)wParam - 1100;
            int i = id/maxy;
            int j = id%maxy; // compute the coordinates using the id
        matrix[i][j]->LoadBitmaps(IDB_BITMAP2,IDB_BITMAP2,IDB_BITMAP2 );
}
}
return CDialog::WindowProc(message, wParam, lParam);
}