MFC制作简易音乐播放器

// MFC音乐播放器Dlg.cpp : implementation file
//
#include "stdafx.h"
#include "MFC音乐播放器.h"
#include "MFC音乐播放器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

//定义三个全局变量
HWND m_hWnd;//记录当前窗口的句柄
DWORD DeviceID;//指定播放音乐的设备
MCI_OPEN_PARMS mciopenparms;//指定打开音乐文件的参数

void Load(HWND hWnd,CString strFilepath)
{
m_hWnd=hWnd;
mciSendCommand(DeviceID,MCI_CLOSE,0,0);//在加载文件前先清空上一次播放的设备
mciopenparms.lpstrElementName=strFilepath;//将音乐文件路径传给设备
DWORD dwReturn;
if(dwReturn=mciSendCommand(NULL,MCI_OPEN,MCI_OPEN_ELEMENT|MCI_WAIT,(DWORD)(LPVOID)&mciopenparms))
{
//如果打开文件失败，则将出错信息储存在buffer，并显示出错警告
char buffer[256];
mciGetErrorString(dwReturn,buffer,256);
MessageBox(hWnd,buffer,"出错警告!",MB_ICONHAND|MB_ICONERROR|MB_ICONSTOP);

}
DeviceID=mciopenparms.wDeviceID;
//打开文件成功就关联文件到设备
}

void play()
{
MCI_PLAY_PARMS mciplayparms;
mciplayparms.dwCallback=(DWORD)m_hWnd;
mciplayparms.dwFrom=0;//每次播放都是从0开始播放  dwFrom用于设置音乐播放的起始位置
mciSendCommand(DeviceID,MCI_PLAY,MCI_FROM|MCI_NOTIFY,(DWORD)(LPVOID)&mciplayparms);//dwCallback与MCI_NOTIFY是配对出现的
}

void pause()
{
mciSendCommand(DeviceID,MCI_PAUSE,0,0);
}
void resume()
{
mciSendCommand(DeviceID,MCI_RESUME,0,0);
}
void stop()
{
mciSendCommand(DeviceID,MCI_STOP,0,0);//当点击停止按钮时，将所有的信息都清除掉
mciSendCommand(DeviceID,MCI_CLOSE,0,0);//点关闭按钮的时候，清除设备信息，再点播放按钮，就播放不了音乐了

}
DWORD setvolume(DWORD vol)
{
MCI_DGV_SETAUDIO_PARMS setvolume;//这是设置音量的参数数据结构
setvolume.dwCallback=NULL;
setvolume.dwItem=MCI_DGV_SETAUDIO_VOLUME;//动作是设置音量
setvolume.dwValue=vol;//音量值是vol
mciSendCommand(DeviceID,MCI_SETAUDIO,MCI_DGV_SETAUDIO_ITEM|MCI_DGV_SETAUDIO_VALUE,(DWORD)(LPVOID)&setvolume);
return 0;
}

/////////////////////////////////////////////////////////////////////////////
// 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()

/////////////////////////////////////////////////////////////////////////////
// CMFCDlg dialog

CMFCDlg::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 Win32
m_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 handlers

BOOL 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 dialog
SetIcon(m_hIcon, TRUE);			// Set big icon
SetIcon(m_hIcon, FALSE);		// Set small icon
m_slider.SetRange(0,1000);//滑块的移动范围0~1000
m_slider.SetPos(500);//滑块指针的初始位置设为500代表初始音量为50
GetDlgItem(IDC_play)->EnableWindow(false);//文件没有读取时所有按钮应该是不可选的
GetDlgItem(IDC_pause)->EnableWindow(false);
GetDlgItem(IDC_stop)->EnableWindow(false);
// TODO: Add extra initialization here

return 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 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
{
//修改对话框的背景
//CDialog::OnPaint();
CPaintDC   dc(this);
CRect   rect;
GetClientRect(&rect);
CDC   dcMem;
dcMem.CreateCompatibleDC(&dc);
CBitmap   bmpBackground;
bmpBackground.LoadBitmap(IDB_BITMAP);  //IDB_BITMAP：自己导入位图的ID
BITMAP   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()    //退出软件按钮的函数
{
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(*.*)|*.*|";//文件类型过滤
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);
//文件读取成功时所有按钮变为可选
GetDlgIte
4000
m(IDC_play)->EnableWindow(true);
GetDlgItem(IDC_pause)->EnableWindow(true);
GetDlgItem(IDC_stop)->EnableWindow(true);
}
}

void CMFCDlg::Onplay()
{
play();
SetDlgItemText(IDC_pause,"暂停");
}

void CMFCDlg::Onpause()
{
CString strtemp;
GetDlgItemText(IDC_pause,strtemp);//获取按钮状态
if(strtemp.Compare("暂停")==0)
{
pause();
SetDlgItemText(IDC_pause,"恢复");
}
if(strtemp.Compare("恢复")==0)
{
resume();
SetDlgItemText(IDC_pause,"暂停");
}
}

void CMFCDlg::Onstop()
{
stop();
SetDlgItemText(IDC_pause,"暂停");
GetDlgItem(IDC_play)->EnableWindow(false);//当stop按钮按下时,播放和暂停应该均不可用
GetDlgItem(IDC_pause)->EnableWindow(false);
}

// MFC音乐播放器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 dialog

class 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_MSG
DECLARE_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_)