三、实现代码
///////////////////////////////////////////////////////////////////// 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);
}
} |
四、 小结
上述实例代码中对ChangeDisplaySettings（）函数的返回值result没有作过多的分析，在实际操作中出于程序稳健的角度出发，可以对ChangeDisplaySettings（）的返回值作出更加详细的判断，以找出修改不成功的原因。通过设置DEVMODE的dmFields成员变量，还可以对系统的刷新率特性进行设置，它的实现方法和上面几乎是一样的，相信不需要再多介绍了。
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