C++ MFC SDI Copy/Paste did not work

Question

I have created a simple MFC SDI Application with an Ribbon. The View for the Document is a FormView with on Edit Control.

If I now use CTRL+V to paste some Text in the Edit Control nothing happens. Same goes with CTRL+C to copy the Text inside the Edit Control. I could use the Context Menu if i right click inside the Edit Control. But how can i enable the Shortcuts? The CTRL + C etc is inside the Accelerator List. If i add the following to the MainForm

BEGIN_MESSAGE_MAP(CMainFrame, CFrameWndEx)
    ON_COMMAND(ID_EDIT_COPY, &CMainFrame::onCopy)
END_MESSAGE_MAP()

and the Function itself

void CMainFrame::onCopy() {
    AfxMessageBox(L"Copy");
}

If i now press CTRL+C the MessageBox Pops up. But i could not copy the text of the Edit Control to the Clipboard. How could I chose between copy text from an Edit Text and doing something else if a different control is selected and CTRL+C is pressed(e.g. if i select text inside the Edit Control it should be copied to the clipboard. If i select e.g. an Item from a Tree View only a popup should shown)?

When you would use google, you would find an answer. Took less than 10 seconds https://bytecrunchers.wordpress.com/2012/05/31/copy-text-from-clipboard-in-mfc-2/ — user743414, Aug 01 '18 at 09:58
Believe it or not i did the google thing to find a solution and also hit that post but this did not helped me. What if i had more then one edit control how to determine the one who is currently selected? How to get the Text of that Textbox to the Clipboard? — Kevin, Aug 01 '18 at 10:21
Maybe post a `WM_COPY` message to the active control? Otherwise removing Ctrl+C from the accelerator would also work (your accelerator will not be capturing the message, but the edit-box does process it, so if this is enough to you...). — Constantine Georgiou, Aug 01 '18 at 15:11

Barmak Shemirani · Accepted Answer · 2018-08-01T22:44:09.383

Use ON_UPDATE_COMMAND_UI to enable/disable command. Use ON_COMMAND to respond to the same command.

You then have to forward the message to the edit control (m_edit.Copy()). You can do this directly in CMyView class (remove the handler from CMainFrame)

If there are more than one edit control, GetFocus will report which edit control has focus.

CEdit::GetSel will report if selection is available.

Do the same with paste. Use m_edit.CanPaste() to see if paste is available. Use m_edit.Paste() for paste command.

BEGIN_MESSAGE_MAP(CMainFrame, CFrameWndEx)
    //ON_COMMAND(ID_EDIT_COPY, &CMainFrame::onCopy)
END_MESSAGE_MAP()

BEGIN_MESSAGE_MAP(CMyView, CView)
    ON_COMMAND(ID_EDIT_COPY, &CMyView::OnEditCopy)
    ON_UPDATE_COMMAND_UI(ID_EDIT_COPY, &CMyView::OnUpdateEditCopy)
    ...
END_MESSAGE_MAP()

class CMyView : public CView
{
    CEdit m_edit1, m_edit2;
    ...
};

void CMyView::OnEditCopy()
{
    CWnd *wnd = GetFocus();
    if(wnd == &m_edit1)
        m_edit1.Copy();
    else if(wnd == &m_edit2)
        m_edit2.Copy();
}

void CMyView::OnUpdateEditCopy(CCmdUI *pCmdUI)
{
    CWnd *wnd = GetFocus();
    int start, end;
    if(wnd == &m_edit1)
    {
        m_edit1.GetSel(start, end);
        pCmdUI->Enable(end > start);
    }
    else if(wnd == &m_edit2)
    {
        m_edit2.GetSel(start, end);
        pCmdUI->Enable(end > start);
    }
}

Or you can do this in CMainFrame, you have to find the handle to the view class and edit control.

Also make sure accelerator key is added.

C++ MFC SDI Copy/Paste did not work

1 Answers1