Playback of music using MCI in MFC

Recently I have studied playing music in MFC, mainly using MCI.

1. library files to be included

Add the library file vfw32.lib winmm. lib to the link resource.

 

2. Included header files

1 #include <mmsystem.h>2 3 #include "stdafx.h"4 5 #include "vfw.h"6 7 #include <digitalv.h>8 9 #pragma comment(lib,"winmm.lib")

3. Declaration and definition of member variables and member functions to be called

 1 class CMp3Dlg : public CDialog 2 { 3 // Construction 4 public: 5     CMp3Dlg(CWnd* pParent = NULL);    // standard constructor 6  7 // Dialog Data 8     //{{AFX_DATA(CMp3Dlg) 9     enum { IDD = IDD_MP3_DIALOG };10     CButton    m_Play;11     CString    m_Path;12     //}}AFX_DATA13 14     // ClassWizard generated virtual function overrides15     //{{AFX_VIRTUAL(CMp3Dlg)16     protected:17     virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support18     //}}AFX_VIRTUAL19 20 // Implementation21 protected:22     HICON m_hIcon;23 24     // Generated message map functions25     //{{AFX_MSG(CMp3Dlg)26     virtual BOOL OnInitDialog();27     afx_msg void OnSysCommand(UINT nID, LPARAM lParam);28     afx_msg void OnPaint();29     afx_msg HCURSOR OnQueryDragIcon();30     afx_msg void OnButtonOpenFile();31     afx_msg void OnButtonPlayMusic();32     afx_msg void OnButtonCyclePlay();33     afx_msg void OnMciNotify(WPARAM wParam,LPARAM lParam);34     //}}AFX_MSG35     DECLARE_MESSAGE_MAP()36 37 public:38     void CyclePlay();39     40 41 private:42     HWND m_video;43     BOOL Pause;44 45     MCIDEVICEID m_wID;46 };

4. Add a message response

 1 BEGIN_MESSAGE_MAP(CMp3Dlg, CDialog) 2     //{{AFX_MSG_MAP(CMp3Dlg) 3     ON_WM_SYSCOMMAND() 4     ON_WM_PAINT() 5     ON_WM_QUERYDRAGICON() 6     ON_BN_CLICKED(IDC_BUTTON_OPEN, OnButtonOpenFile) 7     ON_BN_CLICKED(IDC_BUTTON_PLAY, OnButtonPlayMusic) 8     ON_BN_CLICKED(IDC_BUTTON_CYCLE_PLAY, OnButtonCyclePlay) 9     ON_MESSAGE(MM_MCINOTIFY,OnMciNotify)10     //}}AFX_MSG_MAP11 END_MESSAGE_MAP()

5. Open the corresponding file
Method 1:

1 void cmp3dlg: onbuttonopenfile () 2 {3 // todo: add your control notification handler code here 4 tchar szbuffer [max_path] = {0}; 5 browseinfo Bi; 6 zeromemory (& BI, sizeof (browseinfo); 7 bi. hwndowner = NULL; 8 bi. pszdisplayname = szbuffer; 9 bi. lpsztitle = _ T ("select a file or folder from the following:"); 10 bi. ulflags = bif_browseincludefiles; 11 lpitemidlist IDL = shbrowseforfolder (& BI); 12 13 if (null = IDL) 14 {15 return; 16} 17 shgetpathfromidlist (IDL, szbuffer); 18}

Method 2:

 1 void CMp3Dlg::OnButtonOpenFile() 2 { 3     m_video = NULL; 4     if (m_video == NULL) 5     { 6         CFileDialog filedialog(TRUE,NULL,NULL,OFN_HIDEREADONLY,"MP3 Files (*.mp3)|*.mp3|"); 7         if (filedialog.DoModal() == IDOK) 8         { 9             m_Path = filedialog.GetPathName();10             UpdateData(FALSE);11         }12     }13 }

6. Playing music
Method 1:

 1 void CMp3Dlg::OnButtonPlayMusic()  2 { 3     // TODO: Add your control notification handler code here 4     m_video = NULL;     5     if(m_video == NULL) 6     { 7         m_video = MCIWndCreate(this->GetSafeHwnd(), 8             AfxGetInstanceHandle(), 9           WS_CHILD | WS_VISIBLE|MCIWNDF_NOMENU,m_Path);10     }11     else12     {13         MCIWndHome(m_video);14     }15     MCIWndPlay(m_video);16     m_Play.EnableWindow(FALSE);17 }

Method 2:

 1 void CMp3Dlg::OnButtonCyclePlay()  2 { 3     // TODO: Add your control notification handler code here 4     MCI_OPEN_PARMS mciOP; 5     DWORD dwReturn; 6  7      8     //ASSERT(m_wID == NULL); 9 10     mciOP.lpstrDeviceType = NULL;11     mciOP.lpstrElementName = m_Path;12     dwReturn = mciSendCommand(0,13                     MCI_OPEN,14                     MCI_OPEN_ELEMENT|MCI_WAIT|MCI_OPEN_SHAREABLE,15                     (DWORD)(LPVOID)&mciOP);16 17     if (dwReturn == 0)18     {19         m_wID = mciOP.wDeviceID;20     }21     else22     {23         m_wID = NULL;24     }25 26     CyclePlay();27 }28 29 void CMp3Dlg::CyclePlay()30 {31     MCI_PLAY_PARMS PlayParms;32     PlayParms.dwCallback = (DWORD)GetSafeHwnd();33     PlayParms.dwFrom = 0;34     //mciSendCommand(m_wID,MCI_PLAY,MCI_DGV_PLAY_REPEAT,(DWORD)(LPVOID)&PlayParms);35     mciSendCommand(m_wID,MCI_PLAY,MCI_NOTIFY,(DWORD)(LPVOID)&PlayParms);36 }

7. Loop playback
Method 1:

1 mcisendcommand (m_wid, mci_play, mci_dgv_play_repeat, (DWORD) (lpvoid) & playparms );

1 // mcisendcommand (m_wid, mci_play, mci_notify, (DWORD) (lpvoid) & playparms );

Comment out the 35 rows above and use 34 rows

Method 2: Add a message Response Function

 1 void CMp3Dlg::OnMciNotify(WPARAM wParam,LPARAM lParam) 2 { 3         if(MCI_NOTIFY_SUCCESSFUL == wParam) 4         { 5             //mciSendCommand(m_wID,MCI_CLOSE,0,NULL); 6             //CyclePlay(); 7             MCI_PLAY_PARMS PlayParms;             8             PlayParms.dwFrom = 0;             9             PlayParms.dwCallback = (DWORD)m_hWnd;            10             mciSendCommand(m_wID, MCI_SEEK,MCI_SEEK_TO_START, NULL);            11             mciSendCommand(m_wID, MCI_PLAY, MCI_NOTIFY, (DWORD)(LPVOID)&PlayParms);12         }13 }

The above has been tested!