MFC单文档按钮两两组合按下后不同功能的实现。有若干按钮，按下按钮1和按钮2实现功能一，按下按钮1和按钮3实现功能二，按下按钮1和按钮3实现功能三，按下按钮2和3实现功能四。同时先按下按钮1后按下按钮2和先按下按钮2后按下按钮1实现的功能也不同。*麻烦代码详细一些，初学者理解力较差。

给你完整写了一个，采纳本回答留下email发给你

其他人如果也需要，可以从 https://download.csdn.net/download/caozhy/11220774 下载。

这个不要用按钮，而是应该用CheckBox控件实现。

// Q764102View.cpp : implementation of the CQ764102View class
//

#include "pch.h"
#include "framework.h"
// SHARED_HANDLERS can be defined in an ATL project implementing preview, thumbnail
// and search filter handlers and allows sharing of document code with that project.
#ifndef SHARED_HANDLERS
#include "Q764102.h"
#endif

#include "Q764102Doc.h"
#include "Q764102View.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CQ764102View

IMPLEMENT_DYNCREATE(CQ764102View, CFormView)

BEGIN_MESSAGE_MAP(CQ764102View, CFormView)
    // Standard printing commands
    ON_COMMAND(ID_FILE_PRINT, &CFormView::OnFilePrint)
    ON_COMMAND(ID_FILE_PRINT_DIRECT, &CFormView::OnFilePrint)
    ON_COMMAND(ID_FILE_PRINT_PREVIEW, &CQ764102View::OnFilePrintPreview)
    ON_WM_CONTEXTMENU()
    ON_WM_RBUTTONUP()
    ON_BN_CLICKED(IDC_CHECK1, &CQ764102View::OnClickedCheck1)
    ON_BN_CLICKED(IDC_CHECK2, &CQ764102View::OnClickedCheck2)
    ON_BN_CLICKED(IDC_CHECK3, &CQ764102View::OnClickedCheck3)
    ON_BN_CLICKED(IDC_CHECK4, &CQ764102View::OnClickedCheck4)
END_MESSAGE_MAP()

// CQ764102View construction/destruction

CQ764102View::CQ764102View() noexcept
    : CFormView(IDD_Q764102_FORM)
{
    // TODO: add construction code here

}

CQ764102View::~CQ764102View()
{
}

void CQ764102View::DoDataExchange(CDataExchange* pDX)
{
    CFormView::DoDataExchange(pDX);
}

BOOL CQ764102View::PreCreateWindow(CREATESTRUCT& cs)
{
    // TODO: Modify the Window class or styles here by modifying
    //  the CREATESTRUCT cs

    return CFormView::PreCreateWindow(cs);
}

void CQ764102View::OnInitialUpdate()
{
    CFormView::OnInitialUpdate();
    GetParentFrame()->RecalcLayout();
    ResizeParentToFit();

}


// CQ764102View printing


void CQ764102View::OnFilePrintPreview()
{
#ifndef SHARED_HANDLERS
    AFXPrintPreview(this);
#endif
}

BOOL CQ764102View::OnPreparePrinting(CPrintInfo* pInfo)
{
    // default preparation
    return DoPreparePrinting(pInfo);
}

void CQ764102View::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
    // TODO: add extra initialization before printing
}

void CQ764102View::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
    // TODO: add cleanup after printing
}

void CQ764102View::OnPrint(CDC* pDC, CPrintInfo* /*pInfo*/)
{
    // TODO: add customized printing code here
}

void CQ764102View::OnRButtonUp(UINT /* nFlags */, CPoint point)
{
    ClientToScreen(&point);
    OnContextMenu(this, point);
}

void CQ764102View::OnContextMenu(CWnd* /* pWnd */, CPoint point)
{
#ifndef SHARED_HANDLERS
    theApp.GetContextMenuManager()->ShowPopupMenu(IDR_POPUP_EDIT, point.x, point.y, this, TRUE);
#endif
}


// CQ764102View diagnostics

#ifdef _DEBUG
void CQ764102View::AssertValid() const
{
    CFormView::AssertValid();
}

void CQ764102View::Dump(CDumpContext& dc) const
{
    CFormView::Dump(dc);
}

CQ764102Doc* CQ764102View::GetDocument() const // non-debug version is inline
{
    ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CQ764102Doc)));
    return (CQ764102Doc*)m_pDocument;
}
#endif //_DEBUG


// CQ764102View message handlers

void CQ764102View::DoFunc()
{
    CButton* btn1 = (CButton*)GetDlgItem(IDC_CHECK1);
    int i1 = btn1->GetCheck();
    CButton* btn2 = (CButton*)GetDlgItem(IDC_CHECK2);
    int i2 = btn2->GetCheck();
    CButton* btn3 = (CButton*)GetDlgItem(IDC_CHECK3);
    int i3 = btn3->GetCheck();
    CButton* btn4 = (CButton*)GetDlgItem(IDC_CHECK4);
    int i4 = btn4->GetCheck();
    if (i1 + i2 + i3 + i4 == 2)
    {
        btn1->SetCheck(0);
        btn2->SetCheck(0);
        btn3->SetCheck(0);
        btn4->SetCheck(0);
        if (i1 + i2 == 2)
        {
            MessageBox(_T("功能1"));
        }
        else if (i1 + i3 == 2)
        {
            MessageBox(_T("功能2"));
        }
        else if (i1 + i4 == 2)
        {
            MessageBox(_T("功能3"));
        }
        else if (i2 + i3 == 2)
        {
            MessageBox(_T("功能4"));
        }
        else
        {
            MessageBox(_T("无此功能"));
        }
    }
}

void CQ764102View::OnClickedCheck1()
{
    // TODO: Add your control notification handler code here
    DoFunc();
}


void CQ764102View::OnClickedCheck2()
{
    // TODO: Add your control notification handler code here
    DoFunc();
}


void CQ764102View::OnClickedCheck3()
{
    // TODO: Add your control notification handler code here
    DoFunc();
}


void CQ764102View::OnClickedCheck4()
{
    // TODO: Add your control notification handler code here
    DoFunc();
}