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至顶网软件频道用VC实现动态改变Windows的显示特性

用VC实现动态改变Windows的显示特性

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    对于Windows平台,显示器的分辩率、颜色数、刷新率等特性很重要,尤其是对于多媒体应用软件和游戏软件。在很多情况下,用户当前的屏幕设置并不适合软件的运行需要,软件通常的做法是提示用户将屏幕设置到软件要求的分辩率及颜色数,再重新启动软件。

作者:中国IT实验室 来源:中国IT实验室 2007年10月2日

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 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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