BN_CLICKED

lucy 0

I created a new class based on CButton -- CMyButton. I add a message notification handler in CMyButton.cpp for =BN_CLICKED to change an protected member variable of CMyButton.

void CMyButton::OnClicked()
{
m_nState += 1;
}

Using resource editor, I put an instance of CMyButton to my dialog template. I want my dialog to handle the BN_CLICKED also, do some other stuff.

void CMyDlg::OnMyBtn()
{
MessageBox("Button pressed.");
}

The problem is: CMyDlg::OnMyBtn is never called, even though I add the style of "Notify" to the button instance in the resource editor. What am I missing here? TIA!

Gary R Wheeler

You need an entry in the message map for CMyDlg that 'connects' your button to the handler.

BEGIN_MESSAGE_MAP(CMyDlg, CDialog)
//{{AFX_MSG_MAP(CMyDlg)
ON_BN_CLICKED(IDC_Control_ID, OnMyBtn)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

IDC_Control_ID is the resource ID for the button that you assigned when you created it. To get a feel for this, use the wizard to create a simple dialog application. In the resource editor, drop a button on the dialog. In VC6, right-click on the button you just added and select Events. In VS.NET, right-click and select Add Event Handler. This lets you add code to the dialog class to handle events from the button. Take a look at the code generated by the wizard. It adds code in the following places:

A declaration is added to MyDlg.h for the button handler. This will be a line of the form afx_msg void OnMyButton();
An entry is added to the message map like the example above.
A definition of the handler is added to MyDlg.cpp, similar to the following:

void MyDlg::OnMyButton()
{
// handle the button
}

Software Zen: delete this;

lucy 0

yes, I already had it. It seemed to me that the BN_CLICKED is processed by the button itself and the message never get to the dialog. I add the following to CMyButton::OnClicked:

GetParent()->PostMessage(WM\_COMMAND,
    MAKEWPARAM(this->GetDlgCtrlID(), BN\_CLICKED),
    LPARAM(this->m\_hWnd));

but it didn't help. :confused::( Any hint?