picture1.cpp

用VC++ 6.0在SQL server中添加JPG格式图片

// Picture1.cpp: implementation of the CPicture class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "test1.h"
#include "Picture1.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
#define HIMETRIC_INCH 2540
#define ERROR_TITLE "CPicture Error" // Error Title (Related To This Class)...


//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////


CPicture::CPicture()
//=============================================================================
{
	m_IPicture = NULL;
	m_Height = 0;
	m_Weight = 0;
	m_Width = 0;
}

CPicture::~CPicture()
//=============================================================================
{
	if(m_IPicture != NULL) FreePictureData(); // Important - Avoid Leaks...
}

void CPicture::FreePictureData()
//=============================================================================
{
	if(m_IPicture != NULL)
		{
		m_IPicture->Release();
		m_IPicture = NULL;
		m_Height = 0;
		m_Weight = 0;
		m_Width = 0;
		}
}

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);
}

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);
}

BOOL CPicture::LoadPictureData(BYTE *pBuffer, int nSize)
//=============================================================================
{
	BOOL bResult = FALSE;

	HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, nSize);  //分配内存空间

	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);  //锁存内存空间并返回地址
	memcpy(pData, pBuffer, nSize);    //拷贝内存地址
	GlobalUnlock(hGlobal);             //解除锁定

	IStream* pStream = NULL;

	if(CreateStreamOnHGlobal(hGlobal, TRUE, &pStream) == S_OK)
		{
		HRESULT hr;
		if((hr = OleLoadPicture(pStream, nSize, FALSE, IID_IPicture, (LPVOID *)&m_IPicture)) == E_NOINTERFACE)
			{
			HWND hWnd = AfxGetApp()->GetMainWnd()->m_hWnd;
			MessageBoxEx(hWnd, "IPicture interface is not supported\t", ERROR_TITLE, MB_OK | MB_ICONSTOP, LANG_ENGLISH);
			return(FALSE);
			}
		else // S_OK
			{
			pStream->Release();
			pStream = NULL;
			bResult = TRUE;
			}
		}

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

	return(bResult);
}

//-----------------------------------------------------------------------------
BOOL CPicture::Show(CDC *pDC, CRect DrawRect)
//=============================================================================
{
    if (pDC == NULL || m_IPicture == NULL) return FALSE;
    
    long Width  = 0;
    long Height = 0;
    m_IPicture->get_Width(&Width);
    m_IPicture->get_Height(&Height);

    HRESULT hrP = NULL;
    
    hrP = m_IPicture->Render(pDC->m_hDC,
                      DrawRect.left,                  // Left
                      DrawRect.top,                   // Top
                      DrawRect.right - DrawRect.left, // Right
                      DrawRect.bottom - DrawRect.top, // Bottom
                      0,
                      Height,
                      Width,
                      -Height,
                      &DrawRect);

    if (SUCCEEDED(hrP)) return(TRUE);

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

//-----------------------------------------------------------------------------
BOOL CPicture::Show(CDC *pDC, CPoint LeftTop, CPoint WidthHeight, int MagnifyX, int MagnifyY)
//=============================================================================
{
    if (pDC == NULL || m_IPicture == NULL) return FALSE;
    
    long Width  = 0;
    long Height = 0;
    m_IPicture->get_Width(&Width);
    m_IPicture->get_Height(&Height);
	if(MagnifyX == NULL) MagnifyX = 0;
	if(MagnifyY == NULL) MagnifyY = 0;
	MagnifyX = int(MulDiv(Width, pDC->GetDeviceCaps(LOGPIXELSX), HIMETRIC_INCH) * MagnifyX);
	MagnifyY = int(MulDiv(Height,pDC->GetDeviceCaps(LOGPIXELSY), HIMETRIC_INCH) * MagnifyY);

	CRect DrawRect(LeftTop.x, LeftTop.y, MagnifyX, MagnifyY);

    HRESULT hrP = NULL;

    hrP = m_IPicture->Render(pDC->m_hDC,
                      LeftTop.x,               // Left
                      LeftTop.y,               // Top
                      WidthHeight.x +MagnifyX, // Width
                      WidthHeight.y +MagnifyY, // Height
                      0,
                      Height,
                      Width,
                      -Height,
                      &DrawRect);

    if(SUCCEEDED(hrP)) return(TRUE);

	HWND hWnd = AfxGetApp()->GetMainWnd()->m_hWnd;
	MessageBoxEx(hWnd, "Can not allocate enough memory\t", ERROR_TITLE, MB_OK | MB_ICONSTOP, LANG_ENGLISH);
    return(FALSE);
}
BOOL CPicture::UpdateSizeOnDC(CDC *pDC)

{
	if(pDC == NULL || m_IPicture == NULL) { m_Height = 0; m_Width = 0; return(FALSE); };

    m_IPicture->get_Height(&m_Height);
    m_IPicture->get_Width(&m_Width);

	// Get Current DPI - Dot Per Inch
    int CurrentDPI_X = pDC->GetDeviceCaps(LOGPIXELSX);
    int CurrentDPI_Y = pDC->GetDeviceCaps(LOGPIXELSY);

	// Use a "Standard" Print (When Printing)
    if(pDC->IsPrinting())
		{
		CurrentDPI_X = 200;
        CurrentDPI_Y = 200;
		}

    m_Height = MulDiv(m_Height, CurrentDPI_Y, HIMETRIC_INCH);
    m_Width  = MulDiv(m_Width,  CurrentDPI_X, HIMETRIC_INCH);

    return(TRUE);
}