chngdsplymddlg.cpp

本文件中包含的是《VC编程100例》一书中的源代码

// ChngDsplyMdDlg.cpp : implementation file
//

#include "stdafx.h"
#include "ChngDsplyMd.h"
#include "ChngDsplyMdDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CChngDsplyMdDlg dialog

CChngDsplyMdDlg::CChngDsplyMdDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CChngDsplyMdDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CChngDsplyMdDlg)
	//}}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_Control(pDX, IDC_FREQUENCY, m_CtrlFrequency);
	DDX_Control(pDX, IDC_DIFFERENTIATE, m_CtrlDif);
	DDX_Control(pDX, IDC_COLOR, m_CtrlColor);
	//}}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)
	ON_NOTIFY(NM_CUSTOMDRAW, IDC_DIFFERENTIATE, OnCustomdrawDifferentiate)
	//}}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
	
	//设置IDC_DIFFERENTIATE控件
	m_CtrlDif.SetRange(0, 4, true);
	m_CtrlDif.SetLineSize(1);
	m_CtrlDif.SetPageSize(1);
	SetText();

	GetDisplayInfo();				//获取显示信息

	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()							//改变显示模式
{
	long lResult;
	
	GetData();
	lResult=ChangeDisplaySettings(&m_DisplayMode, 0);		//设置屏幕显示模式
	if(lResult==DISP_CHANGE_SUCCESSFUL)
	{
		MessageBox("修改成功", NULL, MB_ICONINFORMATION | MB_OK);
		//在注册表中写入相关数据
		ChangeDisplaySettings(&m_DisplayMode, CDS_UPDATEREGISTRY);
	}
	else
	{
		ChangeDisplaySettings(NULL, 0);
		GetDisplayInfo();
		MessageBox("修改失败，恢复原有设置！\n根据硬件情况不同，修改失败的原因不一样。",
			NULL, MB_ICONSTOP | MB_OK);
	}
}


void CChngDsplyMdDlg::GetDisplayInfo()						//获得显示信息并显示
{
	CString strText;
	int nIndex;

	//获取显示信息
	if(EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &m_DisplayMode))
	{
		switch(m_DisplayMode.dmBitsPerPel)
		{
		case 4:  nIndex=0;	break;							//16色
		case 8:  nIndex=1;	break;							//256色
		case 16: nIndex=2;	break;							//16位
		case 24: nIndex=3;	break;							//24位
		case 32: nIndex=4;	break;							//32位
		default: nIndex=0;									//无
		}
		m_CtrlColor.SetCurSel(nIndex);						//初始化IDC_COLOR控件

		strText.Format("%d", m_DisplayMode.dmDisplayFrequency);
		nIndex=m_CtrlFrequency.FindString(-1, strText);
		if(nIndex==CB_ERR) nIndex=0;						//FindString函数出错
		m_CtrlFrequency.SetCurSel(nIndex);					//初始化IDC_FREQUENCY控件

		nIndex=-1;
		if(m_DisplayMode.dmPelsWidth==640 && m_DisplayMode.dmPelsHeight==480)
			nIndex=0;
		if(m_DisplayMode.dmPelsWidth==800 && m_DisplayMode.dmPelsHeight==600)
			nIndex=1;
		if(m_DisplayMode.dmPelsWidth==1024 && m_DisplayMode.dmPelsHeight==768)
			nIndex=2;
		if(m_DisplayMode.dmPelsWidth==1152 && m_DisplayMode.dmPelsHeight==864)
			nIndex=3;
		if(m_DisplayMode.dmPelsWidth==1280 && m_DisplayMode.dmPelsHeight==1024)
			nIndex=4;
		if(nIndex==-1) nIndex=0;							//无该分辨率
		m_CtrlDif.SetPos(nIndex);							//初始化IDC_DIFFERENTIATE控件
		SetText();
	}
}


void CChngDsplyMdDlg::SetText()								//设置IDC_DISPLAY控件的显示内容
{
	switch(m_CtrlDif.GetPos())							
	{
	case 0: SetDlgItemText(IDC_DISPLAY, "640×480象素");	break;
	case 1: SetDlgItemText(IDC_DISPLAY, "800×600象素");	break;
	case 2: SetDlgItemText(IDC_DISPLAY, "1024×768象素");	break;
	case 3: SetDlgItemText(IDC_DISPLAY, "1152×860象素");	break;
	case 4: SetDlgItemText(IDC_DISPLAY, "1280×1024象素");	break;
	default: SetDlgItemText(IDC_DISPLAY, "（无）");
	}
}



void CChngDsplyMdDlg::OnCustomdrawDifferentiate(NMHDR* pNMHDR, LRESULT* pResult) 
{
	// TODO: Add your control notification handler code here
	SetText();
	*pResult = 0;
}

void CChngDsplyMdDlg::GetData()
{
	int nIndex;

	//颜色质量
	nIndex=m_CtrlColor.GetCurSel();
	switch(nIndex)
	{
	case 0:  m_DisplayMode.dmBitsPerPel=4;	break;			//16色
	case 1:  m_DisplayMode.dmBitsPerPel=8;	break;			//256色
	case 2:  m_DisplayMode.dmBitsPerPel=16;	break;			//16位色
	case 3:  m_DisplayMode.dmBitsPerPel=24;	break;			//24位色
	case 4:  m_DisplayMode.dmBitsPerPel=32;	break;			//32位色
	default: m_DisplayMode.dmBitsPerPel=0;					//错误
	}

	//屏幕刷新频率
	nIndex=m_CtrlFrequency.GetCurSel();
	switch(nIndex)
	{
	case 0:  m_DisplayMode.dmDisplayFrequency=60;	break;	//60赫兹
	case 1:  m_DisplayMode.dmDisplayFrequency=72;	break;	//72赫兹
	case 2:  m_DisplayMode.dmDisplayFrequency=75;	break;	//75赫兹
	case 3:  m_DisplayMode.dmDisplayFrequency=80;	break;	//80赫兹
	case 4:  m_DisplayMode.dmDisplayFrequency=85;	break;	//85赫兹
	default: m_DisplayMode.dmDisplayFrequency=0;			//错误
	}

	//屏幕分辨率
	nIndex=m_CtrlDif.GetPos();
	switch(nIndex)
	{
	case 0:													//640×480象素
		m_DisplayMode.dmPelsWidth=640;
		m_DisplayMode.dmPelsHeight=480;
		break;
	case 1:													//800×600象素
		m_DisplayMode.dmPelsWidth=800;
		m_DisplayMode.dmPelsHeight=600;
		break;
	case 2:													//1024×768象素
		m_DisplayMode.dmPelsWidth=1024;
		m_DisplayMode.dmPelsHeight=768;
		break;
	case 3:													//1152×860象素
		m_DisplayMode.dmPelsWidth=1152;
		m_DisplayMode.dmPelsHeight=864;
		break;
	case 4:													//1280×1024象素
		m_DisplayMode.dmPelsWidth=1280;
		m_DisplayMode.dmPelsHeight=1024;
		break;
	default:												//错误
		m_DisplayMode.dmPelsWidth=0;
		m_DisplayMode.dmPelsHeight=0;
	}

	m_DisplayMode.dmSize=sizeof(DEVMODE);
	m_DisplayMode.dmDriverExtra=0;
}