vc12bview.cpp

Visual C++ 6.0编程基础与范例

// vc12bView.cpp : implementation of the CVc12bView class
//

#include "stdafx.h"
#include "vc12b.h"

#include "vc12bDoc.h"
#include "vc12bView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CVc12bView

IMPLEMENT_DYNCREATE(CVc12bView, CView)

BEGIN_MESSAGE_MAP(CVc12bView, CView)
	//{{AFX_MSG_MAP(CVc12bView)
	ON_COMMAND(ID_PAUSE, OnPause)
	ON_UPDATE_COMMAND_UI(ID_PAUSE, OnUpdatePause)
	ON_COMMAND(ID_PLAY, OnPlay)
	ON_UPDATE_COMMAND_UI(ID_PLAY, OnUpdatePlay)
	ON_COMMAND(ID_STOP, OnStop)
	ON_UPDATE_COMMAND_UI(ID_STOP, OnUpdateStop)
	ON_COMMAND(ID_FILE_OPEN, OnFileOpen)
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
	ON_MESSAGE(MM_MCINOTIFY,OnNotify)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CVc12bView construction/destruction

CVc12bView::CVc12bView()
{
	// TODO: add construction code here
	m_bPlay=FALSE;
	m_bPause=FALSE;
	m_MCIID=0;
}

CVc12bView::~CVc12bView()
{
	DWORD ErrorWord;
	if (m_MCIID!=0)
	{
	ErrorWord=mciSendCommand(m_MCIID,MCI_STOP,MCI_WAIT,NULL);
	if(ErrorWord)
		{
			DoError(ErrorWord);
		}
	ErrorWord=mciSendCommand(m_MCIID,MCI_CLOSE,MCI_WAIT,NULL);
	if(ErrorWord)
		{
			DoError(ErrorWord);
		}
	}
}

BOOL CVc12bView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CVc12bView drawing

void CVc12bView::OnDraw(CDC* pDC)
{
	CVc12bDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
}

/////////////////////////////////////////////////////////////////////////////
// CVc12bView printing

BOOL CVc12bView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CVc12bView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CVc12bView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CVc12bView diagnostics

#ifdef _DEBUG
void CVc12bView::AssertValid() const
{
	CView::AssertValid();
}

void CVc12bView::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

CVc12bDoc* CVc12bView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CVc12bDoc)));
	return (CVc12bDoc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CVc12bView message handlers

void CVc12bView::OnPause() 
{
	// TODO: Add your command handler code here
	DWORD ErrorWord;
	
	if(!m_bPause)
		ErrorWord=mciSendCommand(m_MCIID,MCI_PAUSE,0,NULL);
	else
		ErrorWord=mciSendCommand(m_MCIID,MCI_RESUME,0,NULL);
	
	if(ErrorWord)
		{
			DoError(ErrorWord);
			return;
		}
	m_bPause=!m_bPause;
}

void CVc12bView::OnUpdatePause(CCmdUI* pCmdUI) 
{
	// TODO: Add your command update UI handler code here

	pCmdUI->SetCheck(m_bPause);
}

void CVc12bView::OnPlay() 
{
	// TODO: Add your command handler code here

	DWORD ErrorWord;
	MCI_PLAY_PARMS mciPlay;	

	if(!m_bPlay)
	{
		mciPlay.dwCallback=(long)GetSafeHwnd();
		mciPlay.dwFrom=0;
		ErrorWord=mciSendCommand(m_MCIID,MCI_PLAY,MCI_FROM|MCI_NOTIFY,(DWORD)(LPVOID)&mciPlay);
		if(ErrorWord)
		{
			DoError(ErrorWord);
			return;
		}
	}
	m_bPlay=TRUE;
}

void CVc12bView::OnUpdatePlay(CCmdUI* pCmdUI) 
{
	// TODO: Add your command update UI handler code here

	pCmdUI->Enable(!m_bPlay);
}

void CVc12bView::OnStop() 
{
	// TODO: Add your command handler code here

	DWORD ErrorWord;
	
	ErrorWord=mciSendCommand(m_MCIID,MCI_STOP,MCI_WAIT,NULL);
	
	if(ErrorWord)
		{
			DoError(ErrorWord);
			return;
		}
	m_bPlay=FALSE;
	m_bPause=FALSE;
}

void CVc12bView::OnUpdateStop(CCmdUI* pCmdUI) 
{
	// TODO: Add your command update UI handler code here

	pCmdUI->Enable(m_bPlay);
}

void CVc12bView::OnFileOpen() 
{
	// TODO: Add your command handler code here
	
	CString OpenFileStr;
	CString lpszFilter ;
	DWORD ErrorWord;

	MCI_OPEN_PARMS mciOpen;

	lpszFilter ="MIDI音频文件(*.mid)|*.mid|波形音频文件(*.wav)|*.wav||";
	
	CFileDialog m_dlg(TRUE,NULL,NULL,OFN_HIDEREADONLY
					|OFN_OVERWRITEPROMPT,lpszFilter );
	if(m_dlg.DoModal()==IDOK)
	{
		OpenFileStr=m_dlg.GetPathName();
		
		if(m_bPlay)
		{
		
			ErrorWord=mciSendCommand(m_MCIID,MCI_CLOSE,0,NULL);

			if(ErrorWord)
			{
				DoError(ErrorWord);
				return;
			}
		}
		mciOpen.lpstrDeviceType=NULL;
		mciOpen.lpstrElementName=OpenFileStr;
		
		ErrorWord=mciSendCommand(0,MCI_OPEN,MCI_OPEN_ELEMENT,(DWORD)(LPVOID)&mciOpen);
		
		if(ErrorWord)
		{
			DoError(ErrorWord);
			return;
		}
		m_MCIID=mciOpen.wDeviceID;
		m_bPlay=FALSE;
		m_bPause=FALSE;
	}

}


void CVc12bView::DoError(DWORD ErrorWord)
{
	char ErrorMessage[MAXERRORLENGTH];
	
	if(mciGetErrorString(ErrorWord,(LPSTR)ErrorMessage,MAXERRORLENGTH))
	{
		MessageBox(ErrorMessage,"多媒体播放错误信息",MAXERRORLENGTH);
	}
	else
	{
		MessageBox("未知错误","多媒体播放错误信息",MAXERRORLENGTH);
	}
}

LRESULT CVc12bView::OnNotify(WPARAM wParam)
{
	if(wParam==MCI_NOTIFY_SUCCESSFUL)
	{
		m_bPlay=FALSE;
		m_bPause=FALSE;
		return 0;
	}
	return -1;
}