jpegshowview.cpp

JPEG压缩标准。这是我在数字图像编码的书书中找到的

// jpegshowView.cpp : implementation of the CJpegshowView class
//

#include "stdafx.h"
#include "jpegshow.h"


#include "jpegshowDoc.h"
#include "jpegshowView.h"
#include"Dib.h"
#include "Jpeg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CJpegshowView

IMPLEMENT_DYNCREATE(CJpegshowView, CView)

BEGIN_MESSAGE_MAP(CJpegshowView, CView)
	//{{AFX_MSG_MAP(CJpegshowView)
	ON_COMMAND(ID_FILE_OPEN, OnFileOpen)
	ON_COMMAND(ID_FILE_SAVE_AS, OnFileSaveAs)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CJpegshowView construction/destruction

CJpegshowView::CJpegshowView()
{
	// TODO: add construction code here


}

CJpegshowView::~CJpegshowView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CJpegshowView drawing

void CJpegshowView::OnDraw(CDC* pDC)
{
	CJpegshowDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
    BeginWaitCursor();
   	if (!m_dib.IsEmpty())
    m_dib.Display(pDC, 0, 0);
    EndWaitCursor();
   
      
}

/////////////////////////////////////////////////////////////////////////////
// CJpegshowView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CJpegshowView message handlers

void CJpegshowView::OnFileOpen() 
{
	// TODO: Add your command handler code here
	CString fileName;
    CString szOpenFilter = "图象文件|*.bmp; *.dib;  *.jpg; *.jpe; *.jpeg; |位图文件 (*.bmp;*.dib)|*.bmp; *.dib|JPEG文件 (*.jpg;*.jpe;*.jpeg)|*.jpg; *.jpe; *.jpeg|All Files (*.*)|*.*||";
	CFileDialog FileDlg(TRUE,NULL, NULL, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, szOpenFilter);
    
  
	if (FileDlg.DoModal() == IDOK)
	{  
		fileName=FileDlg.GetPathName();
	    char drive[_MAX_DRIVE];   
	    char dir[_MAX_DIR];
	    char fname[_MAX_FNAME];   
	    char ext[_MAX_EXT];
	    _splitpath((LPCSTR)fileName, drive, dir, fname, ext);

	    CJpeg jpeg;

	   	if (! stricmp(ext, ".jpg") ||
			 ! stricmp(ext, ".jpe") ||
			 ! stricmp(ext, ".jpeg") )
        
		{
		  if (! jpeg.Load(fileName))
	      AfxMessageBox("false");

	      
          HDIB hDIB = CopyHandle(jpeg.m_dib.GetHandle());

		  m_dib.Attach(hDIB);
		}
		
	
       if (! stricmp(ext, ".bmp") ||
			 ! stricmp(ext, ".dib") )
			 	   
	   { if (!m_dib.Load(fileName))
	      AfxMessageBox("false");
	   
	     HDIB hDIB = CopyHandle(m_dib.GetHandle());
		 m_dib.Attach(hDIB);
	   	}
	
	}
   	
    Invalidate(TRUE);
}


void CJpegshowView::OnFileSaveAs() 
{
	// TODO: Add your command handler code here
	CString fileName;
   	CString szSaveFilter= "位图 (*.bmp;*.dib)|*.bmp; *.dib|JPEG文件 (*.jpg;*.jpe;*.jpeg)|*.jpg; *.jpe; *.jpeg|All Files (*.*)|*.*||";
	CFileDialog FileDlg(FALSE, "*.bmp", NULL, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, szSaveFilter);

	
	if (FileDlg.DoModal() == IDOK)
	{
		fileName=FileDlg.GetPathName();
        char drive[_MAX_DRIVE];   
	    char dir[_MAX_DIR];
	    char fname[_MAX_FNAME];   
	    char ext[_MAX_EXT];
	    _splitpath((LPCSTR)fileName, drive, dir, fname, ext);

		CJpeg jpeg;
		
		if (! stricmp(ext, ".jpg") ||
			 ! stricmp(ext, ".jpe") ||
			 ! stricmp(ext, ".jpeg") )
        
		{	
            
			//将文件存储为JPEG格式
			jpeg.Save(fileName,&m_dib, TRUE, 75);

			
		}

        if (! stricmp(ext, ".bmp") ||
			 ! stricmp(ext, ".dib") )
		{  
			//将文件存储为BMP格式
			m_dib.Save(fileName);
		}

	}
		
}