Bool GetCurrentVideoSettings(DEVMODE *devmode)
　{
　　HWND hwndDesktop=GetDesktopWindow();
　　HDC hdc=GetDC(hwndDesktop);
　　devmode -> dmSize =sizeof(DEVMODE);
　　devmode -> dmBitsPerPel=GetDeviceCaps(hdc,BITSPIXEL);
　　devmode -> dmPelsWidth=GetSystemMetrics(SM_CXSCREEN);
　　devmode -> dmPelsHeight=GetSystemMetrics(SM_CYSCREEN);
　　devmode -> dmFields=DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT;
　　return TRUE;
　}

　int modenum,done;
　DEVMODE devmode;
　done=0;
　modenum=0;
　do
　{
　　done=!EnumDisplaySettings(NULL,modenum,&devmode);
　　AddToList(&devmode);
　　modenum++;
　}while (!done);

/////////////////////////////////////////// ChngDsplyMdDlg.h : header file
#if !defined(AFX_CHNGDSPLYMDDLG_H__1D52415E_62DE_11D6_8F32_00E04CE76240__INCLUDED_)
#define AFX_CHNGDSPLYMDDLG_H__1D52415E_62DE_11D6_8F32_00E04CE76240__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
class CChngDsplyMdDlg : public Cdialog // CChngDsplyMdDlg dialog
{
　// Construction
　public:
　　CChngDsplyMdDlg(CWnd* pParent = NULL); // standard constructor
　　// Dialog Data
　　//{{AFX_DATA(CChngDsplyMdDlg)
　　　enum { IDD = IDD_CHNGDSPLYMD_DIALOG };
　　　UINT m_nBitsPerPixel;
　　　UINT m_nHeightPixels;
　　　UINT m_nWidthPixels;
　　//}}AFX_DATA
　　// ClassWizard generated virtual function overrides
　　//{{AFX_VIRTUAL(CChngDsplyMdDlg)
　　　protected:
　　　　virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
　　//}}AFX_VIRTUAL
　　// Implementation
　protected:
　　HICON m_hIcon;
　// Generated message map functions
　//{{AFX_MSG(CChngDsplyMdDlg)
　　virtual BOOL OnInitDialog();
　　afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
　　afx_msg void OnPaint();
　　afx_msg HCURSOR OnQueryDragIcon();
　　afx_msg void OnChagne();
　//}}AFX_MSG
　DECLARE_MESSAGE_MAP()
};
#endif 
/////////////////////////////////////////// // CChngDsplyMdDlg dialog 
#include "stdafx.h"
#include "ChngDsplyMd.h"
#include "ChngDsplyMdDlg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
CChngDsplyMdDlg::CChngDsplyMdDlg(CWnd* pParent /*=NULL*/)
: CDialog(CChngDsplyMdDlg::IDD, pParent)
{
　//{{AFX_DATA_INIT(CChngDsplyMdDlg)
　　m_nBitsPerPixel = 32;
　　m_nWidthPixels = 1024;
　　m_nHeightPixels = 768;
　//}}AFX_DATA_INIT
　// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
　m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
} 
void CChngDsplyMdDlg::DoDataExchange(CDataExchange* pDX)
{
　CDialog::DoDataExchange(pDX);
　//{{AFX_DATA_MAP(CChngDsplyMdDlg)
　　DDX_Text(pDX, IDC_EDIT_BITS, m_nBitsPerPixel);
　　DDX_Text(pDX, IDC_EDIT_HEIGHT, m_nHeightPixels);
　　DDX_Text(pDX, IDC_EDIT_WIDTH, m_nWidthPixels);
　//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CChngDsplyMdDlg, CDialog)
//{{AFX_MSG_MAP(CChngDsplyMdDlg)
　ON_WM_SYSCOMMAND()
　ON_WM_PAINT()
　ON_WM_QUERYDRAGICON()
　ON_BN_CLICKED(IDC_CHAGNE, OnChagne)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CChngDsplyMdDlg message handlers
BOOL CChngDsplyMdDlg::OnInitDialog()
{
　CDialog::OnInitDialog();
　// Add "About..." menu item to system menu.
　// IDM_ABOUTBOX must be in the system command range.
　ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
　ASSERT(IDM_ABOUTBOX < 0xF000);
　CMenu* pSysMenu = GetSystemMenu(FALSE);
　if (pSysMenu != NULL)
　{
　　CString strAboutMenu;
　　strAboutMenu.LoadString(IDS_ABOUTBOX);
　　if (!strAboutMenu.IsEmpty())
　　{
　　　pSysMenu->AppendMenu(MF_SEPARATOR);
　　　pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
　　}
　}
　// 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
　return TRUE; // return TRUE unless you set the focus to a control
}
void CChngDsplyMdDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
　if ((nID & 0xFFF0) == IDM_ABOUTBOX)
　{
　　CAboutDlg dlgAbout;
　　dlgAbout.DoModal();
　}
　else
　{
　　CDialog::OnSysCommand(nID, lParam);
　}
}
// If you add a minimize button to your dialog, you will need the code below
// to draw the icon. For MFC applications using the document/view model,
// this is automatically done for you by the framework.
void CChngDsplyMdDlg::OnPaint() 
{
　if (IsIconic())
　{
　　CPaintDC dc(this); // device context for painting
　　SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
　　// Center icon in client rectangle
　　int cxIcon = GetSystemMetrics(SM_CXICON);
　　int cyIcon = GetSystemMetrics(SM_CYICON);
　　CRect rect;
　　GetClientRect(&rect);
　　int x = (rect.Width() - cxIcon + 1) / 2;
　　int y = (rect.Height() - cyIcon + 1) / 2;
　　// Draw the icon
　　dc.DrawIcon(x, y, m_hIcon);
　}
　else
　{
　　CDialog::OnPaint();
　}
}
// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CChngDsplyMdDlg::OnQueryDragIcon()
{
　return (HCURSOR) m_hIcon;
}
void CChngDsplyMdDlg::OnChagne() 
{
　UpdateData(TRUE);
　DEVMODE lpDevMode;
　lpDevMode.dmBitsPerPel = m_nBitsPerPixel;
　lpDevMode.dmPelsWidth = m_nWidthPixels;
　lpDevMode.dmPelsHeight = m_nHeightPixels;
　lpDevMode.dmSize = sizeof(lpDevMode);
　lpDevMode.dmFields = DM_PELSWIDTH|DM_PELSHEIGHT|DM_BITSPERPEL;
　LONG result = ChangeDisplaySettings(&lpDevMode,0);
　if(result == DISP_CHANGE_SUCCESSFUL)
　{
　　AfxMessageBox("修改成功");
　　ChangeDisplaySettings(&lpDevMode,CDS_UPDATEREGISTRY);
　　//使用CDS_UPDATEREGISTRY表示次修改是持久的,
　　//并在注册表中写入了相关的数据 
　}
　else
　{
　　AfxMessageBox("修改失败，恢复原有设置");
　　ChangeDisplaySettings(NULL,0);
　} 
}