用VC实现Windows显示特性的动态改变
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; } |
下面的代码展示了如何使用EnumDisplaySettings获得当前支持的所有显示模式:
int modenum,done; DEVMODE devmode; done=0; modenum=0; do { done=!EnumDisplaySettings(NULL,modenum,&devmode); AddToList(&devmode); modenum++; }while (!done); |
设置显示模式的方法如下:
rc = ChangeDisplaySettings(&devmode,CDS_FULLSCREEN)); |
这里的devmode就是前面使用EnumDisplaySettings获得的。如果设置正常,返回值DISP_CHANGE_SUCCESSFUL。
二、 编程步骤
1、启动Visual C++6.0,生成一个基于对话框的项目ChngDsplyMd,在对话框上放置三个编辑控件,ID分别命名为ID_EDIT_WIDTH、ID_EDITHEIGHT、ID_EDIT_BITS,为了说明编辑框控件的功能,其中前二个编辑框控件放置在一个标题为"屏幕区域"的组合框中,第三个编辑框控件旁边添加一个STATIC控件,"Caption"设置为"像素位数"。对话框架上的两个按钮控件的"Caption分别设置为"改变分辩率"、"关闭",ID分别定义为IDC_CHANGE、IDOK;
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_PELSWIDTHDM_PELSHEIGHTDM_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); } } |
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