wavdwv.cpp

组态软件设计实例

// wavdwv.cpp : implementation file
//

#include "stdafx.h"
#include "waves.h"
#include "wave.h"
#include "wavesdoc.h"
#include "wavdvw.h"

#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CWaveDataView

IMPLEMENT_DYNCREATE(CWaveDataView, CScrollView)

CWaveDataView::CWaveDataView()
{
}

CWaveDataView::~CWaveDataView()
{
}


BEGIN_MESSAGE_MAP(CWaveDataView, CScrollView)
    //{{AFX_MSG_MAP(CWaveDataView)
    ON_COMMAND(ID_FILE_SAVE, OnFileSave)
    ON_COMMAND(ID_FILE_SAVE_AS, OnFileSaveAs)
    ON_COMMAND(ID_FILE_PLAY, OnFilePlay)
    ON_COMMAND(ID_FILE_STOP, OnFileStop)
	ON_WM_CREATE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CWaveDataView drawing

void CWaveDataView::OnInitialUpdate()
{
    CScrollView::OnInitialUpdate();

    CSize sizeTotal;
    // TODO: calculate the total size of this view
    sizeTotal.cx = m_iFontWidth * 40;   // Columns
    sizeTotal.cy = m_iFontHeight * 10;  // Lines
    SetScrollSizes(MM_TEXT, sizeTotal);
    ResizeParentToFit();
}

void CWaveDataView::At(CDC* pDC, int line, char* fmt, ...)
{
    char buf[256];
    // Format the string
    vsprintf(buf, fmt, (char*)(&fmt+1));
    pDC->TextOut(0,
                 line * m_iFontHeight,
                 buf,
                 strlen(buf));
}

void CWaveDataView::OnDraw(CDC* pDC)
{
    CWavesDoc* pDoc = GetDocument();
    CWave* pWave = pDoc->GetWave();
    CFont* pOldFont = pDC->SelectObject(&m_Font);
    pDC->SetBkColor(::GetSysColor(COLOR_WINDOW));
    int line = 0;
    At(pDC, line++, "Wave format...");
    WAVEFORMATEX* pfmt = pWave->GetFormat();
    ASSERT(pfmt);
    switch (pfmt->wFormatTag) {
    case WAVE_FORMAT_PCM:
        At(pDC, line++, "Format is PCM");
        break;
    default:
        At(pDC, line++, "Format is unknown (%u)", pfmt->wFormatTag);
        break;
    }
    At(pDC, line++, "%u channels", pfmt->nChannels);
    At(pDC, line++, "%lu samples per second", pfmt->nSamplesPerSec);
    At(pDC, line++, "%lu bytes per second (average)", pfmt->nAvgBytesPerSec);
    At(pDC, line++, "Block alignment is %u bytes", pfmt->nBlockAlign);
    if (pfmt->wFormatTag == WAVE_FORMAT_PCM) {
        PCMWAVEFORMAT* pp = (PCMWAVEFORMAT*) pfmt;
        At(pDC, line++, "PCM data has %u bits per sample", pp->wBitsPerSample);
    }
    At(pDC, line++, "%u samples", pWave->GetNumSamples());

    pDC->SelectObject(pOldFont);
}

/////////////////////////////////////////////////////////////////////////////
// CWaveDataView message handlers


void CWaveDataView::OnFileSave()
{
    AfxMessageBox("Not implemented");
}

void CWaveDataView::OnFileSaveAs()
{
    AfxMessageBox("Not implemented");
}

void CWaveDataView::OnFilePlay()
{
    CWavesDoc* pDoc = GetDocument();
    CWave* pWave = pDoc->GetWave();
    ASSERT(pWave);
    if (!pWave->Play()) {
        AfxMessageBox("Failed to play");
    }
}

void CWaveDataView::OnFileStop()
{
    CWavesDoc* pDoc = GetDocument();
    CWave* pWave = pDoc->GetWave();
    ASSERT(pWave);
    pWave->Stop();
}

int CWaveDataView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CScrollView::OnCreate(lpCreateStruct) == -1)
		return -1;

   m_Font.CreateStockObject(ANSI_FIXED_FONT);
   CDC* pDC = GetDC();
   CFont* pOldFont = pDC->SelectObject(&m_Font);
   TEXTMETRIC tm;
   pDC->GetTextMetrics(&tm);
   pDC->SelectObject(pOldFont);
   m_iFontHeight = tm.tmHeight + tm.tmExternalLeading;
   m_iFontWidth = tm.tmMaxCharWidth;
 	
   return 0;
}