mfc基于多文档实现文件复制、粘贴、全选、剪切、撤销、重做、删除功能的详细步骤和代码

以下是基于MFC多文档实现文件复制、粘贴、全选、剪切、撤销、重做、删除功能的详细步骤和代码示例：

1. 在MFC应用程序中创建一个多文档应用程序。

2. 在文档类中添加以下代码：

void CMyDoc::DeleteContents()
{
    m_strText.Empty();
    SetModifiedFlag(FALSE);
}

BOOL CMyDoc::OnOpenDocument(LPCTSTR lpszPathName)
{
    if (!CDocument::OnOpenDocument(lpszPathName))
        return FALSE;

    CFile file;
    if (!file.Open(lpszPathName, CFile::modeRead | CFile::typeBinary))
        return FALSE;

    ULONGLONG nLength = file.GetLength();
    HGLOBAL hGlobal = ::GlobalAlloc(GMEM_MOVEABLE, nLength + 1);
    LPSTR lpText = (LPSTR)::GlobalLock(hGlobal);

    file.Read(lpText, nLength);
    lpText[nLength] = 0;

    ::GlobalUnlock(hGlobal);

    CString strText(lpText);
    ::GlobalFree(hGlobal);

    m_strText = strText;
    SetModifiedFlag(FALSE);

    return TRUE;
}

BOOL CMyDoc::OnSaveDocument(LPCTSTR lpszPathName)
{
    CFile file;
    if (!file.Open(lpszPathName, CFile::modeCreate | CFile::modeWrite | CFile::typeBinary))
        return FALSE;

    CString strText = m_strText;
    file.Write((LPCTSTR)strText, strText.GetLength());

    SetModifiedFlag(FALSE);

    return TRUE;
}

void CMyDoc::Serialize(CArchive& ar)
{
    if (ar.IsStoring())
        ar << m_strText;
    else
        ar >> m_strText;
}

const CString& CMyDoc::GetText() const
{
    return m_strText;
}

void CMyDoc::SetText(const CString& strText)
{
    m_strText = strText;
    SetModifiedFlag(TRUE);
}

3. 在视图类中添加以下代码：

void CMyView::OnEditCopy()
{
    if (!OpenClipboard())
        return;

    EmptyClipboard();

    CString strText = GetSelectedText();
    HGLOBAL hGlobal = ::GlobalAlloc(GMEM_MOVEABLE, strText.GetLength() + 1);
    LPSTR lpText = (LPSTR)::GlobalLock(hGlobal);

    strcpy_s(lpText, strText.GetLength() + 1, (LPCTSTR)strText);
    ::GlobalUnlock(hGlobal);

    ::SetClipboardData(CF_TEXT, hGlobal);

    CloseClipboard();
}

void CMyView::OnEditCut()
{
    OnEditCopy();
    OnEditDelete();
}

void CMyView::OnEditPaste()
{
    if (!OpenClipboard())
        return;

    HGLOBAL hGlobal = ::GetClipboardData(CF_TEXT);
    LPSTR lpData = (LPSTR)::GlobalLock(hGlobal);
    CString strText(lpData);

    ::GlobalUnlock(hGlobal);
    CloseClipboard();

    ReplaceSelectedText(strText);
}

void CMyView::OnEditDelete()
{
    ReplaceSelectedText(_T(""));
}

void CMyView::OnEditSelectAll()
{
    SetSelection(0, -1);
}

void CMyView::OnEditUndo()
{
    GetDocument()->Undo();
    Invalidate();
}

void CMyView::OnEditRedo()
{
    GetDocument()->Redo();
    Invalidate();
}

CString CMyView::GetSelectedText() const
{
    int nStart, nEnd;
    GetSelection(nStart, nEnd);

    CString strText = GetWindowText();
    return strText.Mid(nStart, nEnd - nStart);
}

void CMyView::ReplaceSelectedText(LPCTSTR lpszText)
{
    int nStart, nEnd;
    GetSelection(nStart, nEnd);

    CString strText = GetWindowText();
    strText.Replace(nStart, nEnd - nStart, lpszText);

    SetWindowText(strText);
    SetSelection(nStart, nStart + lstrlen(lpszText));
}

void CMyView::GetSelection(int& nStart, int& nEnd) const
{
    SendMessage(EM_GETSEL, (WPARAM)&nStart, (LPARAM)&nEnd);
}

void CMyView::SetSelection(int nStart, int nEnd)
{
    SendMessage(EM_SETSEL, nStart, nEnd);
}

4. 在主窗口类中添加以下代码：

BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)
    ON_COMMAND(ID_EDIT_COPY, &CMainFrame::OnEditCopy)
    ON_COMMAND(ID_EDIT_CUT, &CMainFrame::OnEditCut)
    ON_COMMAND(ID_EDIT_DELETE, &CMainFrame::OnEditDelete)
    ON_COMMAND(ID_EDIT_PASTE, &CMainFrame::OnEditPaste)
    ON_COMMAND(ID_EDIT_SELECT_ALL, &CMainFrame::OnEditSelectAll)
    ON_COMMAND(ID_EDIT_UNDO, &CMainFrame::OnEditUndo)
    ON_COMMAND(ID_EDIT_REDO, &CMainFrame::OnEditRedo)
END_MESSAGE_MAP()

void CMainFrame::OnEditCopy()
{
    CMyView* pView = (CMyView*)GetActiveView();
    if (pView != NULL)
        pView->OnEditCopy();
}

void CMainFrame::OnEditCut()
{
    CMyView* pView = (CMyView*)GetActiveView();
    if (pView != NULL)
        pView->OnEditCut();
}

void CMainFrame::OnEditDelete()
{
    CMyView* pView = (CMyView*)GetActiveView();
    if (pView != NULL)
        pView->OnEditDelete();
}

void CMainFrame::OnEditPaste()
{
    CMyView* pView = (CMyView*)GetActiveView();
    if (pView != NULL)
        pView->OnEditPaste();
}

void CMainFrame::OnEditSelectAll()
{
    CMyView* pView = (CMyView*)GetActiveView();
    if (pView != NULL)
        pView->OnEditSelectAll();
}

void CMainFrame::OnEditUndo()
{
    CMyView* pView = (CMyView*)GetActiveView();
    if (pView != NULL)
        pView->OnEditUndo();
}

void CMainFrame::OnEditRedo()
{
    CMyView* pView = (CMyView*)GetActiveView();
    if (pView != NULL)
        pView->OnEditRedo();
}

5. 在资源文件中添加菜单项和工具栏按钮。

6. 编译并运行应用程序，测试文件复制、粘贴、全选、剪切、撤销、重做、删除功能是否正常工作。

以上是基于MFC多文档实现文件复制、粘贴、全选、剪切、撤销、重做、删除功能的详细步骤和代码示例。