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] = {};
     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(,
                     MCI_OPEN,
                     MCI_OPEN_ELEMENT|MCI_WAIT|MCI_OPEN_SHAREABLE,
                     (DWORD)(LPVOID)&mciOP);
 
     if (dwReturn == )
     {
         m_wID = mciOP.wDeviceID;
     }
     else
     {
         m_wID = NULL;
     }
 
     CyclePlay();
 }
 
 void CMp3Dlg::CyclePlay()
 {
     MCI_PLAY_PARMS PlayParms;
     PlayParms.dwCallback = (DWORD)GetSafeHwnd();
     PlayParms.dwFrom = ;
     //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 = ;
             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！