wavopendlg.cpp

VC++6开发指南的源代码第24章-第25章

// WAVOpenDlg.cpp : implementation file
//

#include "stdafx.h"
#include "WAVOpen.h"
#include "WAVOpenDlg.h"

#include "Mmsystem.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()

/////////////////////////////////////////////////////////////////////////////
// CWAVOpenDlg dialog

CWAVOpenDlg::CWAVOpenDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CWAVOpenDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CWAVOpenDlg)
	m_wavfile = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CWAVOpenDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CWAVOpenDlg)
	DDX_Text(pDX, IDC_EDIT1, m_wavfile);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CWAVOpenDlg, CDialog)
	//{{AFX_MSG_MAP(CWAVOpenDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_FILE, OnFile)
	ON_BN_CLICKED(IDC_PLAY, OnPlay)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CWAVOpenDlg message handlers

BOOL CWAVOpenDlg::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 CWAVOpenDlg::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 CWAVOpenDlg::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 CWAVOpenDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CWAVOpenDlg::OnFile() 
{
	// TODO: Add your control notification handler code here
	CString szFilters="WAV Files (*.wav)|*.wav|All Files (*.*)|*.*||";		//定义文件过滤器
   //创建打开文件对话框对象，默认的文件扩展名为 ".my".
   CFileDialog fileDlg (TRUE, "WAV", "*.wav",OFN_FILEMUSTEXIST| OFN_HIDEREADONLY, szFilters, this);
   //调用DoModal()函数显示打开文件对话框
   if( fileDlg.DoModal ()==IDOK )
   {
      m_wavfile = fileDlg.GetPathName();
	  UpdateData(false);//编辑框显示
      //将当前窗口的标题设置为打开文件的名字
      CString fileName = fileDlg.GetFileTitle ();
      SetWindowText(fileName);
   }
}

void CWAVOpenDlg::OnPlay() 
{
// TODO: Add your control notification handler code here
  HMMIO m_hmmio;	//音频文件句柄
  DWORD           WaveLong;       
  DWORD           dwFmtSize; //fmt数据大小          
  DWORD           dwDataOffset;//偏移地址           
  DWORD           dwDataSize; //数组大小  
  MMCKINFO     mmckinfoParent; //父块结构          
  MMCKINFO     mmckinfoSubChunk;//子块结构        
  WAVEFORMATEX     *lpFormat; //波形结构                     
  LONG SoundOffset=0;  //声音数据偏移地址     
  LONG SoundLong=0;    //声音数据的大小
  HPSTR m_lpData;//音频数据
  HWAVEOUT m_hWaveOut;//HWAVEOUT结构
//打开波形文件
  m_hmmio = mmioOpen((LPSTR)(LPCTSTR)m_wavfile,NULL,MMIO_READ);       
  if(!m_hmmio)           
  {             
  mmioClose(m_hmmio,MMIO_FHOPEN); //关闭文件
  return;           
  }           
  //检查打开文件是否为WAV文件           
  mmckinfoParent.fccType =  mmioFOURCC('W','A','V','E');           
  if(mmioDescend(m_hmmio,(LPMMCKINFO)&mmckinfoParent,NULL,MMIO_FINDRIFF))           
  {           
  //不是WAV文件,关闭文件并退出      
  mmioClose(m_hmmio,MMIO_FHOPEN);           
  return;           
  }           
  //查找'fmt'块        
  mmckinfoSubChunk.ckid=mmioFOURCC('f','m','t',' ');           
  if(mmioDescend(m_hmmio,&mmckinfoSubChunk,&mmckinfoParent,MMIO_FINDCHUNK))           
  {           
  //找不到fmt块,关闭文件并退出      
  mmioClose(m_hmmio,MMIO_FHOPEN);       
  return;           
  }             
  //获取fmt块的大小，申请内存         
  dwFmtSize= mmckinfoSubChunk.cksize;         
  HLOCAL m_hFormat=LocalAlloc(LMEM_MOVEABLE,LOWORD(dwFmtSize));           
  if(!m_hFormat)           
  {           
  //申请内存失败,关闭文件并退出       
  mmioClose(m_hmmio,MMIO_FHOPEN);       
  return;           
  }           
  //锁定fmt块内存  
  lpFormat = (WAVEFORMATEX*)LocalLock(m_hFormat);           
  if(!lpFormat)           
  {           
  //锁定内存失败,关闭文件并退出    
  mmioClose(m_hmmio,MMIO_FHOPEN);       
  LocalUnlock(m_hFormat);           
  LocalFree(m_hFormat);       
  return;           
  }           
  //将波形文件的Fmt块数据读入lpFormat 
  if((unsigned long)mmioRead(m_hmmio,(HPSTR)lpFormat,dwFmtSize)!= dwFmtSize)           
  {           
  //读数据失败,关闭文件并退出       
  mmioClose(m_hmmio,MMIO_FHOPEN);       
  LocalUnlock(m_hFormat);           
  LocalFree(m_hFormat);       
  return;           
  }            
  //离开'fmt'块           
  mmioAscend(m_hmmio,&mmckinfoSubChunk,0);            
  //查找'data'块         
  mmckinfoSubChunk.ckid   =   mmioFOURCC('d','a','t','a');           
  if(mmioDescend(m_hmmio,&mmckinfoSubChunk,&mmckinfoParent,MMIO_FINDCHUNK))           
  {           
  //不能找到data块, 关闭文件并退出         
  mmioClose(m_hmmio,MMIO_FHOPEN);       
  LocalUnlock(m_hFormat);           
  LocalFree(m_hFormat);       
  return;           
  }              
  //获取'data'块的大小及偏移地址           
  dwDataSize =   mmckinfoSubChunk.cksize;           
  dwDataOffset  =   mmckinfoSubChunk.dwDataOffset;           
  if(dwDataSize== 0L)           
  {           
  //如果data块中没有数据,关闭文件并退出      
  mmioClose(m_hmmio,MMIO_FHOPEN);       
  LocalUnlock(m_hFormat);           
  LocalFree(m_hFormat);       
  return;           
  }           
  //为音频数据分配内存
  m_lpData = new  char[dwDataSize];         
  if(!m_lpData)           
  {           
  //分配失败,HPSTR m_lpData;//音频数据        
  mmioClose(m_hmmio,MMIO_FHOPEN);       
  LocalUnlock(m_hFormat);           
  LocalFree(m_hFormat);           
  if(m_lpData!= NULL)       
  delete[] m_lpData;       
  return;           
  }             
  //将波形文件定位到声音数据处
  SoundOffset =   dwDataOffset;   
  if(mmioSeek(m_hmmio,SoundOffset,SEEK_SET) < 0 )           
  {           
  //定位失败,关闭文件并退出       
  mmioClose(m_hmmio,MMIO_FHOPEN);       
  LocalUnlock(m_hFormat);           
  LocalFree(m_hFormat);           
  delete[]  m_lpData; 
  return;             
  }           
  //读取声音波形数据data  
  SoundLong = dwDataSize;   
  WaveLong=mmioRead(m_hmmio,m_lpData,SoundLong);           
  if(WaveLong <0)           
  {           
  //读取data数据失败,关闭文件并退出       
  mmioClose(m_hmmio,MMIO_FHOPEN);       
  LocalUnlock(m_hFormat);           
  LocalFree(m_hFormat);           
  delete[]  m_lpData;    
  return;           
  }       
	//检查音频设备
   if(waveOutGetNumDevs()==0)
   {
	AfxMessageBox("没有可用的音频设备!");
	return;
   } 

  //检查音频输出设备是否能播放指定的音频文件           
  if(waveOutOpen (&m_hWaveOut,0,lpFormat,NULL,NULL,CALLBACK_NULL) !=  MMSYSERR_NOERROR)           
  {               
  //如果不能播放, 关闭文件、释放内存并退出    
  mmioClose(m_hmmio,MMIO_FHOPEN);       
  waveOutReset(m_hWaveOut);           
  waveOutClose(m_hWaveOut);           
  LocalUnlock(m_hFormat);           
  LocalFree(m_hFormat);           
  delete [] m_lpData;       
  return;           
  }           

  //准备待播放的数据  
  WAVEHDR m_pWaveOutHdr;
  m_pWaveOutHdr.lpData  =   (HPSTR)m_lpData;//数据           
  m_pWaveOutHdr.dwBufferLength =   WaveLong;  //长度         
  m_pWaveOutHdr.dwFlags= 0;    
  m_pWaveOutHdr.dwFlags= WHDR_BEGINLOOP|WHDR_ENDLOOP   ;       
  m_pWaveOutHdr.dwLoops= 1;   //循环次数 
   //准备WAV数据 
  if(waveOutPrepareHeader(m_hWaveOut,&m_pWaveOutHdr,sizeof(WAVEHDR)) == MMSYSERR_INVALHANDLE)           
  {           
   //如果创建WAV数据内存失败, 关闭文件、释放内存并退出      
  mmioClose(m_hmmio,MMIO_FHOPEN);       
  waveOutReset(m_hWaveOut);           
  waveOutClose(m_hWaveOut);           
  LocalUnlock(m_hFormat);           
  LocalFree(m_hFormat);       
  return;           
  }
  //播放音频数据文件           
  if(waveOutWrite(m_hWaveOut,&m_pWaveOutHdr,sizeof(WAVEHDR))!=0)           
  {           
   //如果播放失败, 关闭文件、释放内存并退出     
  mmioClose(m_hmmio,MMIO_FHOPEN);       
  waveOutReset(m_hWaveOut);           
  waveOutClose(m_hWaveOut);           
  LocalUnlock(m_hFormat);           
  LocalFree(m_hFormat); 
  return;           
  } 

}