MFC下MCI的使用播放音乐

最近研究了一下MFC下的音乐的播放，主要使用了MCI

1.需要包含的库文件

在链接资源里（link）添加库文件VFW32.lib winmm.lib

2.包含的头文件

#include <mmsystem.h>

#include "stdafx.h"

#include "vfw.h"

#include <digitalv.h>

#pragma comment(lib,"winmm.lib")

3.需要调用的成员变量和成员函数的声明、定义

class CMp3Dlg : public CDialog
{
// Construction
public:
    CMp3Dlg(CWnd* pParent = NULL);    // standard constructor

// Dialog Data
    //{{AFX_DATA(CMp3Dlg)
    enum { IDD = IDD_MP3_DIALOG };
    CButton    m_Play;
    CString    m_Path;
    //}}AFX_DATA

    // ClassWizard generated virtual function overrides
    //{{AFX_VIRTUAL(CMp3Dlg)
    protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
    //}}AFX_VIRTUAL

// Implementation
protected:
    HICON m_hIcon;

    // Generated message map functions
    //{{AFX_MSG(CMp3Dlg)
    virtual BOOL OnInitDialog();
    afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
    afx_msg void OnPaint();
    afx_msg HCURSOR OnQueryDragIcon();
    afx_msg void OnButtonOpenFile();
    afx_msg void OnButtonPlayMusic();
    afx_msg void OnButtonCyclePlay();
    afx_msg void OnMciNotify(WPARAM wParam,LPARAM lParam);
    //}}AFX_MSG
    DECLARE_MESSAGE_MAP()

public:
    void CyclePlay();
    

private:
    HWND m_video;
    BOOL Pause;

    MCIDEVICEID m_wID;
};

4.添加消息响应

BEGIN_MESSAGE_MAP(CMp3Dlg, CDialog)
    //{{AFX_MSG_MAP(CMp3Dlg)
    ON_WM_SYSCOMMAND()
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_BN_CLICKED(IDC_BUTTON_OPEN, OnButtonOpenFile)
    ON_BN_CLICKED(IDC_BUTTON_PLAY, OnButtonPlayMusic)
    ON_BN_CLICKED(IDC_BUTTON_CYCLE_PLAY, OnButtonCyclePlay)
    ON_MESSAGE(MM_MCINOTIFY,OnMciNotify)
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

5.打开相应的文件
方法一：

void CMp3Dlg::OnButtonOpenFile() 
{
    // TODO: Add your control notification handler code here
    TCHAR szBuffer[MAX_PATH] = {0};
    BROWSEINFO bi;
    ZeroMemory(&bi,sizeof(BROWSEINFO));
    bi.hwndOwner = NULL;
    bi.pszDisplayName = szBuffer;
    bi.lpszTitle = _T("从下面选择文件或者文件夹:");
    bi.ulFlags = BIF_BROWSEINCLUDEFILES;
    LPITEMIDLIST idl = SHBrowseForFolder(&bi);

    if (NULL == idl)
    {
        return;
    }
    SHGetPathFromIDList(idl,szBuffer);
}

方法二：

void CMp3Dlg::OnButtonOpenFile()
{
    m_video = NULL;
    if (m_video == NULL)
    {
        CFileDialog filedialog(TRUE,NULL,NULL,OFN_HIDEREADONLY,"MP3 Files (*.mp3)|*.mp3|");
        if (filedialog.DoModal() == IDOK)
        {
            m_Path = filedialog.GetPathName();
            UpdateData(FALSE);
        }
    }
}

6.音乐的播放
方法一：

void CMp3Dlg::OnButtonPlayMusic() 
{
    // TODO: Add your control notification handler code here
    m_video = NULL;    
    if(m_video == NULL)
    {
        m_video = MCIWndCreate(this->GetSafeHwnd(),
            AfxGetInstanceHandle(),
          WS_CHILD | WS_VISIBLE|MCIWNDF_NOMENU,m_Path);
    }
    else
    {
        MCIWndHome(m_video);
    }
    MCIWndPlay(m_video);
    m_Play.EnableWindow(FALSE);
}

方法二：

void CMp3Dlg::OnButtonCyclePlay() 
{
    // TODO: Add your control notification handler code here
    MCI_OPEN_PARMS mciOP;
    DWORD dwReturn;

    
    //ASSERT(m_wID == NULL);

    mciOP.lpstrDeviceType = NULL;
    mciOP.lpstrElementName = m_Path;
    dwReturn = mciSendCommand(0,
                    MCI_OPEN,
                    MCI_OPEN_ELEMENT|MCI_WAIT|MCI_OPEN_SHAREABLE,
                    (DWORD)(LPVOID)&mciOP);

    if (dwReturn == 0)
    {
        m_wID = mciOP.wDeviceID;
    }
    else
    {
        m_wID = NULL;
    }

    CyclePlay();
}

void CMp3Dlg::CyclePlay()
{
    MCI_PLAY_PARMS PlayParms;
    PlayParms.dwCallback = (DWORD)GetSafeHwnd();
    PlayParms.dwFrom = 0;
    //mciSendCommand(m_wID,MCI_PLAY,MCI_DGV_PLAY_REPEAT,(DWORD)(LPVOID)&PlayParms);
    mciSendCommand(m_wID,MCI_PLAY,MCI_NOTIFY,(DWORD)(LPVOID)&PlayParms);
}

7.循环播放
方法一：

 mciSendCommand(m_wID,MCI_PLAY,MCI_DGV_PLAY_REPEAT,(DWORD)(LPVOID)&PlayParms);

 //mciSendCommand(m_wID,MCI_PLAY,MCI_NOTIFY,(DWORD)(LPVOID)&PlayParms);  

将上面的35行注释掉，使用34行

方法二：添加消息响应函数

void CMp3Dlg::OnMciNotify(WPARAM wParam,LPARAM lParam)
{
        if(MCI_NOTIFY_SUCCESSFUL == wParam)
        {
            //mciSendCommand(m_wID,MCI_CLOSE,0,NULL);
            //CyclePlay();
            MCI_PLAY_PARMS PlayParms;            
            PlayParms.dwFrom = 0;            
            PlayParms.dwCallback = (DWORD)m_hWnd;            
            mciSendCommand(m_wID, MCI_SEEK,MCI_SEEK_TO_START, NULL);            
            mciSendCommand(m_wID, MCI_PLAY, MCI_NOTIFY, (DWORD)(LPVOID)&PlayParms);
        }
}

以上所述经过测试！