picture.cpp

vc中处理jpeg文件以及vc中对现有jpeg图片建立数据库的文件。有较大参考价值

//-----------------------------------------------------------------------------
// Picture (Implementations) Version 1.00
//
// Routins 4 Showing Picture Files... (.BMP .DIB .EMF .GIF .ICO .JPG .WMF)
//
// Author: Dr. Yovav Gad, EMail: [e-mail] ,Web: www.SuperMain.com
//=============================================================================
// 
// Full Story:
// ~~~~~~~~~~~
// There R Many Libraries To Handle Image Files, Anyway Most Of Them Do Not
// Include Source Files Or Just Very Complicated To Implement / Understand,
// 
// After Many Days Of Searching (And Not Finding) a Way To Load a JPG From a
// Resource And Show It On a *Dialog Based* Application, I Decided 2 Take Steps
//
// So I Created What I Call a Very *Simple* & Useful Class,
// It Can Easily Implemented By Adding It To a Project, And U Do Not Have To
// Be a Real JPEG Freak - And Invent All Header Reading From The Beginning
// (It Uses The IPicture Interface - Same Way As Internet Explorer Does)
//
// I Would Like To Thank Mr.Peter Hendrix For His Wonderful Work
// That I Found On: http://www.thecodeproject.com/bitmap/cpicture.asp
// Which I Was Inspired And Got The IPicture Interface Idea From...
//
// Guess U Will Find It Useful,
// Appreciate If U Can Mention My Name On Your Final Code,
// Please Feel Free To Send Me Any Improvements Or SaveAsJPG() Functions:
//
// (This Program Has No Bugs - Only Undocumented Solutions)
//
// Author: Dr. Yovav Gad, EMail: [e-mail] ,Web: www.SuperMain.com
//
//--------------------------Example & Usage 4 Dummies--------------------------
//
//  U Need 2 Add "CPicture.CPP" and "CPicture.H" Into Your Project (From FileView)
//  So U Will Get Control Over The Functions In This Class,
//  Then U Can Create a Picture Object And Show It On a Device Context
//
//  CPicture m_Picture;  // Create a Picture Object (An Instance Of This Class)
//  #include "Picture.h" // Make Sure U Include This Where U Gonna Create The Object...
//
//  Load Picture Data Into The IPicture Interface (.BMP .DIB .EMF .GIF .ICO .JPG .WMF)
//  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	m_Picture.Load("Test.JPG"); // Load From a File - Just Load It (Show Later)
//	m_Picture.Load(IDR_TEST, "JPG"); // Load From a Resource - Just Load It (Show Later)
//  (U Must Include IDR_TEST In Your Resources Under a Custom Name, 4 Example - "JPG")
//  
//  When Using DC Object On a *Dialog Based* Application (CPaintDC dc(this);)
//  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	m_Picture.UpdateSizeOnDC(&dc); // Get Picture Dimentions In Pixels
//	m_Picture.Show(&dc, CPoint(0,0), CPoint(m_Picture.m_Width, m_Picture.m_Height), 0,0);
//	m_Picture.Show(&dc, CRect(0,0,100,100)); // Change Original Dimentions
//	m_Picture.ShowBitmapResource(&dc, IDB_TEST, CPoint(0,0)); // Show Bitmap Resource
//
//  OR When Using a Pointer On a "Regular" MFC Application (CDC* pDC)
//  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//	m_Picture.UpdateSizeOnDC(pDC); // Get Picture Dimentions In Pixels
//	m_Picture.Show(pDC, CPoint(0,0), CPoint(m_Picture.m_Width, m_Picture.m_Height), 0,0);
//	m_Picture.Show(pDC, CRect(0,0,100,100)); // Change Original Dimentions
//	m_Picture.ShowBitmapResource(pDC, IDB_TEST, CPoint(0,0)); // Show Bitmap Resource
//
//  Show Picture Information
//  ~~~~~~~~~~~~~~~~~~~~~~~~
//	CString S;
//	S.Format("Size = %4d\nWidth = %4d\nHeight = %4d\nWeight = %4d\n",
//	m_Picture.m_Weight, m_Picture.m_Width, m_Picture.m_Height, m_Picture.m_Weight);
//	AfxMessageBox(S);
//
//----------------------------Cut The Bullshit Here----------------------------

#include "stdafx.h"
#include "Picture.h"

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

#define HIMETRIC_INCH 2540
#define ERROR_TITLE "CPicture Error" // Error Title (Related To This Class)...

//-----------------------------------------------------------------------------
// Does:   Constructor - Create a New CPicture Object To Hold Picture Data
// ~~~~
//
//-----------------------------------------------------------------------------
CPicture::CPicture()
//=============================================================================
{
	m_IPicture = NULL;
	m_Height = 0;
	m_Weight = 0;
	m_Width = 0;
}

//-----------------------------------------------------------------------------
// Does:   Destructor - Free Data And Information From The CPicture Object
// ~~~~
//
//-----------------------------------------------------------------------------
CPicture::~CPicture()
//=============================================================================
{
	if(m_IPicture != NULL) FreePictureData(); // Important - Avoid Leaks...
}


//-----------------------------------------------------------------------------
// Does:   Free The Allocated Memory That Holdes The IPicture Interface Data
// ~~~~    And Clear Picture Information
//
// Note:   This Might Also Be Useful If U Only Need To Show The Picture Once
// ~~~~~   Or If U Copy The Picture To The Device Context, So It Can Still
//         Remain On Screen - But IPicture Data Is Not Needed No More
//
//-----------------------------------------------------------------------------
void CPicture::FreePictureData()
//=============================================================================
{
	if(m_IPicture != NULL)
		{
		m_IPicture->Release();
		m_IPicture = NULL;
		m_Height = 0;
		m_Weight = 0;
		m_Width = 0;
		}
}

//-----------------------------------------------------------------------------
// Does:   Open a Resource And Load It Into IPicture (Interface)
// ~~~~    (.BMP .DIB .EMF .GIF .ICO .JPG .WMF)
//
// Note:   When Adding a Bitmap Resource It Would Automatically Show On "Bitmap"
// ~~~~    This NOT Good Coz We Need To Load It From a Custom Resource "BMP"
//         To Add a Custom Rresource: Import Resource -> Open As -> Custom
//         (Both .BMP And .DIB Should Be Found Under "BMP")
//
// InPut:  ResourceName - As a UINT Defined (Example: IDR_PICTURE_RESOURCE)
// ~~~~~   ResourceType - Type Name (Example: "JPG")
//
// OutPut: TRUE If Succeeded...
// ~~~~~~
//-----------------------------------------------------------------------------
BOOL CPicture::Load(UINT ResourceName, LPCSTR ResourceType)
//=============================================================================
{
	BOOL bResult = FALSE;

	HGLOBAL		hGlobal = NULL;
	HRSRC		hSource = NULL;
	LPVOID		lpVoid  = NULL;
	int			nSize   = 0;

	if(m_IPicture != NULL) FreePictureData(); // Important - Avoid Leaks...

	hSource = FindResource(AfxGetResourceHandle(), MAKEINTRESOURCE(ResourceName), ResourceType);

	if(hSource == NULL)
		{
		HWND hWnd = AfxGetApp()->GetMainWnd()->m_hWnd;
		MessageBoxEx(hWnd, "FindResource() Failed\t", ERROR_TITLE, MB_OK | MB_ICONSTOP, LANG_ENGLISH);
		return(FALSE);
		}

	hGlobal = LoadResource(AfxGetResourceHandle(), hSource);
	if(hGlobal == NULL)
		{
		HWND hWnd = AfxGetApp()->GetMainWnd()->m_hWnd;
		MessageBoxEx(hWnd, "LoadResource() Failed\t", ERROR_TITLE, MB_OK | MB_ICONSTOP, LANG_ENGLISH);
		return(FALSE);
		}

	lpVoid = LockResource(hGlobal);
	if(lpVoid == NULL)
		{
		HWND hWnd = AfxGetApp()->GetMainWnd()->m_hWnd;
		MessageBoxEx(hWnd, "LockResource() Failed\t", ERROR_TITLE, MB_OK | MB_ICONSTOP, LANG_ENGLISH);
		return(FALSE);
		}

	nSize = (UINT)SizeofResource(AfxGetResourceHandle(), hSource);
	if(LoadPictureData((BYTE*)hGlobal, nSize)) bResult = TRUE;

	UnlockResource(hGlobal); // 16Bit Windows Needs This
	FreeResource(hGlobal); // 16Bit Windows Needs This (32Bit - Automatic Release)

	m_Weight = nSize; // Update Picture Size Info...

	if(m_IPicture != NULL) // Do Not Try To Read From Memory That Is Not Exist...
		{ 
		m_IPicture->get_Height(&m_Height);
		m_IPicture->get_Width(&m_Width);
	    // Calculate Its Size On a "Standard" (96 DPI) Device Context
	    m_Height = MulDiv(m_Height, 96, HIMETRIC_INCH);
	    m_Width  = MulDiv(m_Width,  96, HIMETRIC_INCH);
		}
	else // Picture Data Is Not a Known Picture Type
		{
		m_Height = 0;
		m_Width = 0;
		bResult = FALSE;
		}

	return(bResult);
}

//-----------------------------------------------------------------------------
// Does:   Open a File And Load It Into IPicture (Interface)
// ~~~~    (.BMP .DIB .EMF .GIF .ICO .JPG .WMF)
//
// InPut:  sFilePathName - Path And FileName Target To Save
// ~~~~~   
//
// OutPut: TRUE If Succeeded...
// ~~~~~~
//-----------------------------------------------------------------------------
BOOL CPicture::Load(CString sFilePathName)
//=============================================================================
{
	BOOL bResult = FALSE;
	CFile PictureFile;
	CFileException e;
	int	nSize = 0;

	if(m_IPicture != NULL) FreePictureData(); // Important - Avoid Leaks...

	if(PictureFile.Open(sFilePathName, CFile::modeRead | CFile::typeBinary, &e))
		{
		nSize = PictureFile.GetLength();
		BYTE* pBuffer = new BYTE[nSize];
	
		if (PictureFile.Read(pBuffer, nSize) > 0 )  //从文件读到pBuffer
			{ if(LoadPictureData(pBuffer, nSize))	bResult = TRUE;	}//接作调用函数读pBuffer

		PictureFile.Close();
		
		delete [] pBuffer;
		}
	else // Open Failed...
		{
		TCHAR szCause[255];
		e.GetErrorMessage(szCause, 255, NULL);
		HWND hWnd = AfxGetApp()->GetMainWnd()->m_hWnd;
		MessageBoxEx(hWnd, szCause, ERROR_TITLE, MB_OK | MB_ICONSTOP, LANG_ENGLISH);
		bResult = FALSE;
		}

	m_Weight = nSize; // Update Picture Size Info...

	if(m_IPicture != NULL) // Do Not Try To Read From Memory That Is Not Exist...
		{ 
		m_IPicture->get_Height(&m_Height);
		m_IPicture->get_Width(&m_Width);
	    // Calculate Its Size On a "Standard" (96 DPI) Device Context
	    m_Height = MulDiv(m_Height, 96, HIMETRIC_INCH);
	    m_Width  = MulDiv(m_Width,  96, HIMETRIC_INCH);
		}
	else // Picture Data Is Not a Known Picture Type
		{
		m_Height = 0;
		m_Width = 0;
		bResult = FALSE;
		}

	return(bResult);
}

//-----------------------------------------------------------------------------
// Does:   Read The Picture Data From a Source (File / Resource)
// ~~~~    And Load It Into The Current IPicture Object In Use
//
// InPut:  Buffer Of Data Source (File / Resource) And Its Size
// ~~~~~   
//
// OutPut: Feed The IPicture Object With The Picture Data
// ~~~~~~  (Use Draw Functions To Show It On a Device Context)
//         TRUE If Succeeded...
//-----------------------------------------------------------------------------
BOOL CPicture::LoadPictureData(BYTE *pBuffer, int nSize)
//=============================================================================
{
	BOOL bResult = FALSE;

	HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, nSize);

	if(hGlobal == NULL)
		{
		HWND hWnd = AfxGetApp()->GetMainWnd()->m_hWnd;
		MessageBoxEx(hWnd, "Can not allocate enough memory\t", ERROR_TITLE, MB_OK | MB_ICONSTOP, LANG_ENGLISH);
		return(FALSE);
		}

	void* pData = GlobalLock(hGlobal);