picture.cpp

对列表中的图片的浏览,可以进行上下翻页,可以装载jpg的图片

//////////////////////////////////////////////////////////////////////
// Picture.cpp: implementation of the CPicture class.
// Lounge Stdio  2003     
// 作者：边城浪子（QQ：16168666）
// E-mail: [e-mail]
//////////////////////////////////////////////////////////////////////

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


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


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

CPicture::CPicture()
:m_pPic(NULL), _h_him(0), _w_him(0), m_size(0,0)
{
}

CPicture::~CPicture()
{
 Release();
}

void CPicture::Release()
{
 if(m_pPic != NULL)
 {
  m_pPic->Release();
  m_pPic = NULL;
  _h_him = _w_him = 0;
  m_size.cx = m_size.cy = 0;
 }
}

BOOL CPicture::LoadPicture(LPCTSTR lpszResource, LPCTSTR lpszResType)
{
 Release();

 HINSTANCE  hInst = AfxFindResourceHandle(lpszResource, lpszResType);
 HRSRC hRsrc = ::FindResource(hInst, lpszResource, lpszResType);
 if(hRsrc == NULL) return FALSE;
 HGLOBAL hGlobal = LoadResource(hInst, hRsrc);
 
 if(hGlobal == NULL) return FALSE;
 
 
 DWORD dwSize = SizeofResource(hInst, hRsrc);
 
 HGLOBAL hMem = ::GlobalAlloc(GMEM_MOVEABLE, dwSize);
 if(hMem == NULL) return  FALSE;
 
 LPVOID  pSrc = ::LockResource(hGlobal);
 if(pSrc == NULL) {
  ::GlobalFree(hMem);
  return FALSE;
 }
 
 LPVOID pDes = ::GlobalLock(hMem);
 if(pDes == NULL){
  //::GlobalUnlock(hGlobal);
  ::GlobalFree(hMem);
  return FALSE;
 }
 
 memcpy(pDes, pSrc, dwSize);
 
 //GlobalUnlock(hGlobal);
 GlobalUnlock(hMem);
 
 ::FreeResource(hGlobal);
 
 IStream* pStm = NULL;
 CreateStreamOnHGlobal(hMem, TRUE, &pStm);
  
 if(!SUCCEEDED(OleLoadPicture(pStm,dwSize,TRUE,IID_IPicture,(LPVOID*)&m_pPic)))
 {
  pStm -> Release();
  ::GlobalFree(hMem);
  pStm = NULL;
  return FALSE;
 }
 
 pStm->Release();
 ::GlobalFree(hMem);
 
 CalcSize();
 return TRUE;

}

BOOL CPicture::LoadPictureFromFile(LPCTSTR lpszFileName)
{
 Release();

 CFile   file;
 if(!file.Open(lpszFileName, CFile::modeRead))
  return FALSE;

 DWORD dwSize = file.GetLength();
 
 HGLOBAL hMem = ::GlobalAlloc(GMEM_MOVEABLE, dwSize);
 if(hMem == NULL) return  FALSE;
  
 LPVOID pDes = ::GlobalLock(hMem);
 if(pDes == NULL){
  ::GlobalFree(hMem);
  return FALSE;
 }
 
 file.ReadHuge(pDes, dwSize);
 
 file.Close();

 GlobalUnlock(hMem);
  
 IStream* pStm = NULL;
 CreateStreamOnHGlobal(hMem, TRUE, &pStm);
 
 if(!SUCCEEDED(OleLoadPicture(pStm,dwSize,TRUE,IID_IPicture,(LPVOID*)&m_pPic)))
 {
  pStm -> Release();
  ::GlobalFree(hMem);
  pStm = NULL;
  return FALSE;
 }
 
 pStm->Release();
 ::GlobalFree(hMem);
 
 CalcSize();
 return TRUE;

}


void CPicture::CalcSize()
{
 if(m_pPic == NULL) return;

 m_pPic->get_Width(&_w_him);
 m_pPic->get_Height(&_h_him);

 CDC* pDC = CWnd::GetDesktopWindow()->GetDC();
 m_size.cx = _w_him;
 m_size.cy = _h_him;

 pDC->HIMETRICtoDP(&m_size);

 CWnd::GetDesktopWindow()->ReleaseDC(pDC);

}

void CPicture::Draw(CDC* pDC, LPCRECT lprcDest, LPCRECT lprcSrc)
{
 if(m_pPic)
 {
  CSize  szOrig(lprcSrc->left, lprcSrc->top);
  CSize  szSrc(lprcSrc->right - lprcSrc->left, lprcSrc->bottom - lprcSrc->top);
  pDC->DPtoHIMETRIC(&szOrig);
  pDC->DPtoHIMETRIC(&szSrc);

  m_pPic->Render(*pDC, lprcDest->left,lprcDest->top,lprcDest->right-lprcDest->left,
   lprcDest->bottom-lprcDest->top, szOrig.cx, _h_him-szOrig.cy, szSrc.cx,
   -szSrc.cy, NULL);
 }
}

void CPicture::Draw(CDC* pDC, int xDest,int yDest, int cxDest, int cyDest ,
  int xSrc ,int ySrc ,int cxSrc ,int cySrc)
{
 Draw(pDC, CRect(xDest, yDest, xDest+cxDest, yDest+cyDest), CRect(xSrc, ySrc, xSrc+cxSrc, ySrc+cySrc));
}