// MFC音樂播放器Dlg.cpp : implementation file // #include "stdafx.h" #include "MFC音樂播放器.h" #include "MFC音樂播放器Dlg.h" #include "Mmsystem.h" #include "Digitalv.h" #pragma comment(lib,"Winmm.lib") #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif//定義三個全局變量 HWND m_hWnd;//記錄當前窗口的句柄 DWORD DeviceID;//指定播放音樂的設備 MCI_OPEN_PARMS mciopenparms;//指定打開音樂文件的參數void Load(HWND hWnd,CString strFilepath) {m_hWnd=hWnd;mciSendCommand(DeviceID,MCI_CLOSE,0,0);//在加載文件前先清空上一次播放的設備mciopenparms.lpstrElementName=strFilepath;//將音樂文件路徑傳給設備DWORD dwReturn;if(dwReturn=mciSendCommand(NULL,MCI_OPEN,MCI_OPEN_ELEMENT|MCI_WAIT,(DWORD)(LPVOID)&mciopenparms)){//如果打開文件失敗，則將出錯信息儲存在buffer，并顯示出錯警告char buffer[256];mciGetErrorString(dwReturn,buffer,256);MessageBox(hWnd,buffer,"出錯警告!",MB_ICONHAND|MB_ICONERROR|MB_ICONSTOP);}DeviceID=mciopenparms.wDeviceID;//打開文件成功就關聯文件到設備 }void play() {MCI_PLAY_PARMS mciplayparms;mciplayparms.dwCallback=(DWORD)m_hWnd;mciplayparms.dwFrom=0;//每次播放都是從0開始播放 dwFrom用于設置音樂播放的起始位置mciSendCommand(DeviceID,MCI_PLAY,MCI_FROM|MCI_NOTIFY,(DWORD)(LPVOID)&mciplayparms);//dwCallback與MCI_NOTIFY是配對出現的 }void pause() {mciSendCommand(DeviceID,MCI_PAUSE,0,0); } void resume() {mciSendCommand(DeviceID,MCI_RESUME,0,0); } void stop() {mciSendCommand(DeviceID,MCI_STOP,0,0);//當點擊停止按鈕時，將所有的信息都清除掉mciSendCommand(DeviceID,MCI_CLOSE,0,0);//點關閉按鈕的時候，清除設備信息，再點播放按鈕，就播放不了音樂了} DWORD setvolume(DWORD vol) {MCI_DGV_SETAUDIO_PARMS setvolume;//這是設置音量的參數數據結構setvolume.dwCallback=NULL;setvolume.dwItem=MCI_DGV_SETAUDIO_VOLUME;//動作是設置音量setvolume.dwValue=vol;//音量值是volmciSendCommand(DeviceID,MCI_SETAUDIO,MCI_DGV_SETAUDIO_ITEM|MCI_DGV_SETAUDIO_VALUE,(DWORD)(LPVOID)&setvolume);return 0; }/ // CAboutDlg dialog used for App Aboutclass 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_MSGDECLARE_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()/ // CMFCDlg dialogCMFCDlg::CMFCDlg(CWnd* pParent /*=NULL*/): CDialog(CMFCDlg::IDD, pParent) {//{{AFX_DATA_INIT(CMFCDlg)m_int = 0;//}}AFX_DATA_INIT// Note that LoadIcon does not require a subsequent DestroyIcon in Win32m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); }void CMFCDlg::DoDataExchange(CDataExchange* pDX) {CDialog::DoDataExchange(pDX);//{{AFX_DATA_MAP(CMFCDlg)DDX_Control(pDX, IDC_SLIDER, m_slider);DDX_Text(pDX, IDC_vol, m_int);//}}AFX_DATA_MAP }BEGIN_MESSAGE_MAP(CMFCDlg, CDialog)//{{AFX_MSG_MAP(CMFCDlg)ON_WM_SYSCOMMAND()ON_WM_PAINT()ON_WM_QUERYDRAGICON()ON_BN_CLICKED(IDC_about, Onabout)ON_BN_CLICKED(IDC_exitbt, Onexitbt)ON_NOTIFY(NM_CUSTOMDRAW, IDC_SLIDER, OnCustomdrawSlider)ON_BN_CLICKED(IDC_filechoice, Onfilechoice)ON_BN_CLICKED(IDC_play, Onplay)ON_BN_CLICKED(IDC_pause, Onpause)ON_BN_CLICKED(IDC_stop, Onstop)//}}AFX_MSG_MAP END_MESSAGE_MAP()/ // CMFCDlg message handlersBOOL CMFCDlg::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 dialogSetIcon(m_hIcon, TRUE); // Set big iconSetIcon(m_hIcon, FALSE); // Set small iconm_slider.SetRange(0,1000);//滑塊的移動范圍0~1000m_slider.SetPos(500);//滑塊指針的初始位置設為500代表初始音量為50GetDlgItem(IDC_play)->EnableWindow(false);//文件沒有讀取時所有按鈕應該是不可選的GetDlgItem(IDC_pause)->EnableWindow(false);GetDlgItem(IDC_stop)->EnableWindow(false);// TODO: Add extra initialization herereturn TRUE; // return TRUE unless you set the focus to a control }void CMFCDlg::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 CMFCDlg::OnPaint() {if (IsIconic()){CPaintDC dc(this); // device context for paintingSendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);// Center icon in client rectangleint 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 icondc.DrawIcon(x, y, m_hIcon);}else{//修改對話框的背景//CDialog::OnPaint();CPaintDC dc(this); CRect rect; GetClientRect(&rect); CDC dcMem; dcMem.CreateCompatibleDC(&dc); CBitmap bmpBackground; bmpBackground.LoadBitmap(IDB_BITMAP); //IDB_BITMAP：自己導入位圖的IDBITMAP bitmap; bmpBackground.GetBitmap(&bitmap); CBitmap *pbmpOld=dcMem.SelectObject(&bmpBackground); dc.StretchBlt(0,0,rect.Width(),rect.Height(),&dcMem,0,0, bitmap.bmWidth,bitmap.bmHeight,SRCCOPY); } }// The system calls this to obtain the cursor to display while the user drags // the minimized window. HCURSOR CMFCDlg::OnQueryDragIcon() {return (HCURSOR) m_hIcon; }void CMFCDlg::Onabout() {CAboutDlg dlg;dlg.DoModal(); }void CMFCDlg::Onexitbt() //退出軟件按鈕的函數 {CDialog::OnCancel(); }void CMFCDlg::OnCustomdrawSlider(NMHDR* pNMHDR, LRESULT* pResult) {UpdateData(true);m_int=m_slider.GetPos()/10;setvolume(m_slider.GetPos());UpdateData(false);*pResult = 0; }void CMFCDlg::Onfilechoice() {char szFileFilter[]="mp3文件(*.mp3)|*.mp3|""wma文件(*.wma)|*.wma|""wav文件(*.wav)|*.wav|""所有文件(*.*)|*.*|";//文件類型過濾 CFileDialog dlg(true,NULL,NULL,OFN_HIDEREADONLY,szFileFilter);if(dlg.DoModal()==IDOK){CString strFilepath=dlg.GetPathName();CString strFilename=dlg.GetFileName();SetDlgItemText(IDC_filename,strFilename);Load(this->m_hWnd,strFilepath);//文件讀取成功時所有按鈕變為可選GetDlgItem(IDC_play)->EnableWindow(true);GetDlgItem(IDC_pause)->EnableWindow(true);GetDlgItem(IDC_stop)->EnableWindow(true);} }void CMFCDlg::Onplay() {play();SetDlgItemText(IDC_pause,"暫停"); }void CMFCDlg::Onpause() {CString strtemp;GetDlgItemText(IDC_pause,strtemp);//獲取按鈕狀態if(strtemp.Compare("暫停")==0){pause();SetDlgItemText(IDC_pause,"恢復");} if(strtemp.Compare("恢復")==0){resume();SetDlgItemText(IDC_pause,"暫停");} }void CMFCDlg::Onstop() {stop(); SetDlgItemText(IDC_pause,"暫停");GetDlgItem(IDC_play)->EnableWindow(false);//當stop按鈕按下時,播放和暫停應該均不可用GetDlgItem(IDC_pause)->EnableWindow(false); }

頭文件如下：

// MFC音樂播放器Dlg.h : header file //#if !defined(AFX_MFCDLG_H__207E26CE_BBBE_4D81_8A38_AEA46E10AB5B__INCLUDED_) #define AFX_MFCDLG_H__207E26CE_BBBE_4D81_8A38_AEA46E10AB5B__INCLUDED_#if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000/ // CMFCDlg dialogclass CMFCDlg : public CDialog { // Construction public:CMFCDlg(CWnd* pParent = NULL); // standard constructor// Dialog Data//{{AFX_DATA(CMFCDlg)enum { IDD = IDD_MFC_DIALOG };CSliderCtrl m_slider;int m_int;//}}AFX_DATA// ClassWizard generated virtual function overrides//{{AFX_VIRTUAL(CMFCDlg)protected:virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support//}}AFX_VIRTUAL// Implementation protected:HICON m_hIcon;// Generated message map functions//{{AFX_MSG(CMFCDlg)virtual BOOL OnInitDialog();afx_msg void OnSysCommand(UINT nID, LPARAM lParam);afx_msg void OnPaint();afx_msg HCURSOR OnQueryDragIcon();afx_msg void Onabout();afx_msg void Onexitbt();afx_msg void OnCustomdrawSlider(NMHDR* pNMHDR, LRESULT* pResult);afx_msg void Onfilechoice();afx_msg void Onplay();afx_msg void Onpause();afx_msg void Onstop();//}}AFX_MSGDECLARE_MESSAGE_MAP() };//{{AFX_INSERT_LOCATION}} // Microsoft Visual C++ will insert additional declarations immediately before the previous line.#endif // !defined(AFX_MFCDLG_H__207E26CE_BBBE_4D81_8A38_AEA46E10AB5B__INCLUDED_)

最后運行效果如下：

總結

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