www.pudn.com > JPEG_DEMO.rar > JPEG_DEMODlg.cpp

// JPEG_DEMODlg.cpp : implementation file 
// 
 
#include "stdafx.h" 
#include "JPEG_DEMO.h" 
#include "JPEG_DEMODlg.h" 
 
#ifdef _DEBUG 
#define new DEBUG_NEW 
#undef THIS_FILE 
static char THIS_FILE[] = __FILE__; 
#endif 
 
///////////////////////////////////////////////////////////////////////////// 
// CJPEG_DEMODlg dialog 
 
CJPEG_DEMODlg::CJPEG_DEMODlg(CWnd* pParent /*=NULL*/) 
	: CDialog(CJPEG_DEMODlg::IDD, pParent) 
{ 
	//{{AFX_DATA_INIT(CJPEG_DEMODlg) 
		// NOTE: the ClassWizard will add member initialization here 
	//}}AFX_DATA_INIT 
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 
} 
 
void CJPEG_DEMODlg::DoDataExchange(CDataExchange* pDX) 
{ 
	CDialog::DoDataExchange(pDX); 
	//{{AFX_DATA_MAP(CJPEG_DEMODlg) 
		// NOTE: the ClassWizard will add DDX and DDV calls here 
	//}}AFX_DATA_MAP 
} 
 
BEGIN_MESSAGE_MAP(CJPEG_DEMODlg, CDialog) 
	//{{AFX_MSG_MAP(CJPEG_DEMODlg) 
	ON_WM_PAINT() 
	ON_WM_QUERYDRAGICON() 
	ON_BN_CLICKED(ID_SHOW_JPEG, OnShowJpeg) 
	//}}AFX_MSG_MAP 
END_MESSAGE_MAP() 
 
///////////////////////////////////////////////////////////////////////////// 
// CJPEG_DEMODlg message handlers 
 
BOOL CJPEG_DEMODlg::OnInitDialog() 
{ 
	CDialog::OnInitDialog(); 
 
	// Set the icon for this dialog.  The framework does this automatically 
	//  when the application's main window is not a dialog 
	SetIcon(m_hIcon, TRUE);			// Set big icon 
	SetIcon(m_hIcon, FALSE);		// Set small icon 
	 
	// TODO: Add extra initialization here 
	 
	return TRUE;  // return TRUE  unless you set the focus to a control 
} 
 
// If you add a minimize button to your dialog, you will need the code below 
//  to draw the icon.  For MFC applications using the document/view model, 
//  this is automatically done for you by the framework. 
 
void CJPEG_DEMODlg::OnPaint()  
{ 
	if (IsIconic()) 
	{ 
		CPaintDC dc(this); // device context for painting 
 
		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 
 
		// Center icon in client rectangle 
		int cxIcon = GetSystemMetrics(SM_CXICON); 
		int cyIcon = GetSystemMetrics(SM_CYICON); 
		CRect rect; 
		GetClientRect(&rect); 
		int x = (rect.Width() - cxIcon + 1) / 2; 
		int y = (rect.Height() - cyIcon + 1) / 2; 
 
		// Draw the icon 
		dc.DrawIcon(x, y, m_hIcon); 
	} 
	else 
	{ 
		CDialog::OnPaint(); 
	} 
} 
 
// The system calls this to obtain the cursor to display while the user drags 
//  the minimized window. 
HCURSOR CJPEG_DEMODlg::OnQueryDragIcon() 
{ 
	return (HCURSOR) m_hIcon; 
} 
 
void CJPEG_DEMODlg::OnShowJpeg()  
{ 
	 
	OPENFILENAME of; 
	char filename[100]=""; 
	char szFilter[100]="所有文件(*.*)\0*.*\0图象源文件(*.jpg)\0*.jpg\0\0"; 
	char szCustomFilter[]="*.jpg\0"; 
	 
	of.Flags=OFN_PATHMUSTEXIST|OFN_FILEMUSTEXIST; 
	of.hInstance=NULL; 
	of.hwndOwner=this->m_hWnd; 
	of.lCustData=0; 
	of.lpfnHook=NULL; 
	of.lStructSize=sizeof(of); 
	 
	of.lpstrCustomFilter=NULL; 
	of.nMaxCustFilter=0; 
	 
	of.lpstrDefExt=NULL; 
	of.lpstrFile=NULL; 
	of.nMaxFile=0; 
	 
	of.lpstrFileTitle=filename; 
	of.nMaxFileTitle=sizeof(filename); 
	 
	of.lpstrFilter=szFilter; 
	of.nFilterIndex=1; 
	of.lpstrInitialDir="d:\\qcif"; 
	 
	of.lpstrTitle=NULL; 
	of.lpTemplateName=NULL; 
	 
	of.nFileExtension=0; 
	of.nFileOffset=0; 
 
	unsigned char *fJpegBuf; 
	int i=0; 
	char bfilename[100]="c:\\"; 
	FILE *fJpeg=NULL; 
	static HFILE file; 
 
	if(GetOpenFileName(&of)) 
	{ 
		static OFSTRUCT ofs; 
		ofs.cBytes=sizeof(ofs); 
 
		file=OpenFile(filename,&ofs,OF_READ); 
		int nBytetoRead=GetFileSize((HANDLE)file,NULL); 
		unsigned long nByteRead; 
		fJpegBuf=(unsigned char *) malloc(nBytetoRead); 
		ReadFile((HANDLE)file,fJpegBuf,nBytetoRead,&nByteRead,NULL); 
 
		i=0; 
		while(filename[i]!='.') { bfilename[i+3]=filename[i]; i++; } 
		bfilename[i+3]='\0'; 
		strcat(bfilename,".bmp"); 
 
 
		if(!this->m_clrJpegDec.ShowJpegToScreen(fJpegBuf,bfilename)) 
			MessageBox("解码出错!"); 
		else MessageBox("解码成功，BMP文件保存到C盘根目录"); 
 
	}	 
	else this->MessageBox("文件出错!"); 
}