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用VC实现动态改变Windows的显示特性

 2007-03-15 21:46:00 来源:WEB开发网   
核心提示: 2、使用Class Wizard为上述三个编辑控件定义相应的成员变量,它们分别为:UINT m_nWidthPixels、 UINT m_nHeightPixels、 UINT m_nBitsPerPixel3、实现对话框架中的按钮单击情况下的处理函数,用VC实现动态改变Windows的显

2、使用Class Wizard为上述三个编辑控件定义相应的成员变量,它们分别为:

UINT m_nWidthPixels、 UINT m_nHeightPixels、 UINT m_nBitsPerPixel

3、实现对话框架中的按钮单击情况下的处理函数,编译运行程序。

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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Tags:VC 实现 动态

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