playsong.cpp

本系统实现了简单的点歌功能

// Playsong.cpp : implementation file
//

#include "stdafx.h"
#include "songclient.h"
#include "Playsong.h"

#include "ClientWnd.h"

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

/////////////////////////////////////////////////////////////////////////////
// CPlaysong dialog

CPlaysong::CPlaysong(CWnd* pParent /*=NULL*/)
	: CDialog(CPlaysong::IDD, pParent)
{
	//{{AFX_DATA_INIT(CPlaysong)
	//}}AFX_DATA_INIT

	m_nTotalNum = 0;
 	m_nCurrentIndex = -1;
	m_pstrFilePath = NULL;
}

void CPlaysong::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CPlaysong)
	DDX_Control(pDX, IDC_Mediaplay, m_mediaplay);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CPlaysong, CDialog)
	//{{AFX_MSG_MAP(CPlaysong)
	ON_WM_TIMER()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CPlaysong message handlers
BOOL CPlaysong::OnInitDialog() 
{
	CDialog::OnInitDialog();

 	m_mediaplay.SetShowControls(false);
	m_mediaplay.SetShowDisplay(false);
 	m_mediaplay.SetAutoStart(true);//自动播放
	
 	m_mediaplay.SetFullScreenMode(true);//全屏播放
	m_mediaplay.SetVolume(0);//声音最大
 	m_mediaplay.SetBalance(0);//设置平衡

	//注册系统热键
	RegisterHotKey(m_hWnd, 50000, 0, 'A');//音量增
	RegisterHotKey(m_hWnd, 50001, 0, 'B');//音量减
	RegisterHotKey(m_hWnd, 50002, 0, 'D');//停唱
 	RegisterHotKey(m_hWnd, 50003, 0, VK_F2);//伴唱，换声道
// 	RegisterHotKey(m_hWnd, 50004, 0, VK_RETURN);//回车键，暂停或继续播放

	SetTimer(1, 100, NULL);
 
	return TRUE;  // return TRUE unless you set the focus to a control
	              // EXCEPTION: OCX Property Pages should return FALSE
}

BOOL CPlaysong::PreTranslateMessage(MSG* pMsg) 
{
	if( pMsg->message == WM_HOTKEY)
	{
		switch( (int)pMsg->wParam )
		{
		case 50000://按下了a
			SetVolume();
			break;
		case 50001://按下了b
			SetVolume(false);
			break;
		case 50002://按下了d
			//找到全屏播放窗口，发WM_CLOSE给它，让其退出全屏
 			CWnd* pWnd;
			pWnd = FindWindow("VideoRenderer", "ActiveMovie Window");
			if( pWnd != NULL)
 				::SendMessage(pWnd->m_hWnd, WM_CLOSE, 0, 0);
  			//找到全屏播放窗口，发WM_CLOSE给它，让其退出全屏 end
				
			m_mediaplay.SetFullScreenMode(false);
 			m_mediaplay.Stop();
			ShowWindow(SW_HIDE);
   			break;
 		case 50003://按下了F2
			SetBalance();
 			break;
 	/*	case 50004://按下了回车键
 		//	CWnd* pWnd;
			pWnd = FindWindow("VideoRenderer", "ActiveMovie Window");
			if( pWnd != NULL)
			{
				static BOOL bplay = false;
				bplay = !bplay;
				if(bplay)
					m_mediaplay.Run();
				else
					m_mediaplay.Pause();
				break;
			}
			::SendMessage(GetParent()->m_hWnd, WM_KEYDOWN, VK_RETURN, 0);
 			break;*/
		}
	}
   	
	return CDialog::PreTranslateMessage(pMsg);
}

/////////////////////////////////////////////////////////////
/*函数功能: 设置播放列表
//参数说明: lpszFilePath: 文件路径
            bFst: 是否为第一次调用该函数，是则将m_pstrFilePath数组清空，
			      以后调用则把歌曲加到m_pstrFilePath数组中 */
void CPlaysong::SetFilePath(LPCTSTR lpszFilePath, BOOL bFst)
{
	if(!strcmp(lpszFilePath, ""))
		return;

	if( bFst )
	{
		delete[] m_pstrFilePath;
		m_nTotalNum = 0;
		m_nCurrentIndex = -1;
		m_pstrFilePath = NULL;
	}

	CString *strtmp;
 	if(m_pstrFilePath != NULL)
	{
		strtmp = new CString[m_nTotalNum];
		for(int i = 0; i < m_nTotalNum; i++)
			strtmp[i] = m_pstrFilePath[i];
		
		delete[] m_pstrFilePath;
		m_pstrFilePath = NULL;
	}

	m_pstrFilePath = new CString[++m_nTotalNum];
	for(int i = 0; i < m_nTotalNum - 1; i++)
		m_pstrFilePath[i] = strtmp[i];
	m_pstrFilePath[i] = lpszFilePath;
}

void CPlaysong::Play(int nIndex)
{
	if( nIndex >= m_nTotalNum || m_pstrFilePath == NULL )
		return;

	m_nCurrentIndex = nIndex;
 	m_mediaplay.SetFileName(m_pstrFilePath[m_nCurrentIndex]);
 	m_mediaplay.SetFullScreenMode(false);
 	m_mediaplay.SetFullScreenMode(true);
}

/////////////////////////////////////////////////////////////
/*函数功能: 改变声音大小
//参数说明: bTurnup: 是否为增大 */
void CPlaysong::SetVolume(BOOL bTurnup)
{
	long lVolume = bTurnup ? m_mediaplay.GetVolume()+200 : m_mediaplay.GetVolume()-200;
	if(lVolume > 0)
		lVolume = 0;
	else if(lVolume < -4000)
		lVolume = -4000;

	m_mediaplay.SetVolume(lVolume);
}

/////////////////////////////////////////////////////////////
/*函数功能: 改变声道
//参数说明: bLeft: 是否为左声道 */
void CPlaysong::SetBalance()
{
	static long lBalance = -10000;
	lBalance += 10000;
	if(lBalance > 10000)
		lBalance = -10000;
	m_mediaplay.SetBalance(lBalance);
}

void CPlaysong::PlayNextSong()
{
	m_nCurrentIndex++;
	if( m_nCurrentIndex >= m_nTotalNum )//循环播放
		m_nCurrentIndex = 0;
	Play( m_nCurrentIndex );
}

void CPlaysong::OnTimer(UINT nIDEvent) 
{
	double nCurrentPos = m_mediaplay.GetCurrentPosition();//当前播放的位置
	double nTotalLen = m_mediaplay.GetDuration();//歌曲的总时间
	//自动播放下一首
	if( (int)nTotalLen != 0  && (int)nCurrentPos >= (int)nTotalLen - 1 )
	{
		PlayNextSong();
	}
   	
	CDialog::OnTimer(nIDEvent);
}