IPicture总结

1、IPicture接口对象的创建
         方法1：直接通过文件创建
LPCSTR szFileUrl;
 IPicture *pIPicture;
 OleLoadPicturePath(CComBSTR(szFileUrl), 
   (LPUNKNOWN)NULL, 
   0, 
   0, 
   IID_IPicture,
   (LPVOID*)&pIPicture))
        方法2：通过IStream来创建
 // 加载电子地图
 LPCSTR szFileUrl;
 IStream *pStream = NULL;
 IPicture *pIPicture = NULL;;
 CFileStatus fstatus;
 CFile file;
 LONG lFileSize;
 HGLOBAL hGlobal;
 if(file.Open(szFileUrl, CFile::modeRead) && file.GetStatus(szFileUrl, fstatus) 
  && ((lFileSize = fstatus.m_size) != -1))
 {
  hGlobal = GlobalAlloc(GMEM_MOVEABLE, lFileSize);// 开辟大内存
  if(hGlobal != NULL)
  {
   LPVOID pvData = NULL;
   pvData = GlobalLock(hGlobal);
   if(pvData != NULL)
   { 
    file.ReadHuge(pvData, lFileSize);   // 将图片数据保存在内存中
    GlobalUnlock(hGlobal);
    CreateStreamOnHGlobal(hGlobal, TRUE, &m_pIStream);  // 创建流
    file.Close();
   }
   else
   {
    GlobalFree(hGlobal);
    return;
   }
  }
  else
  {
   file.Close();
   return;
  }
 }
 else
 {
  //打开图片失败
  return;
 }
 OleLoadPicture(m_pIStream, fstatus.m_size, TRUE, IID_IPicture, (LPVOID*)&m_pIPicture);
 GlobalFree(hGlobal);

2、通过IPicture来获取图片的尺寸
 OLE_XSIZE_HIMETRIC hmPicWidth;       
 OLE_YSIZE_HIMETRIC hmPicHeight;      
 pIPicture->get_Width(&hmPicWidth);   // 获取图像宽度
 pIPicture->get_Height(&hmPicHeight); // 获取图像高度
 // 转化单位为象素
 nPicWidth = MulDiv(hmPicWidth, GetDeviceCaps(GetDC()->m_hDC, LOGPIXELSX), HIMETRIC_PER_INCH);
 nPicHeight = MulDiv(hmPicHeight, GetDeviceCaps(GetDC()->m_hDC, LOGPIXELSY), HIMETRIC_PER_INCH);

3、通过IPicture来画图
void ShowPicture(CDC *pDC)
{
 OLE_XPOS_HIMETRIC xSrc;  // 图片中当前显示区域的x
 OLE_YPOS_HIMETRIC ySrc;  // 图片中当前显示区域的y
 OLE_XSIZE_HIMETRIC cxSrc; // 图片中当前显示区域的宽度
 OLE_YSIZE_HIMETRIC cySrc; // 图片中当前显示区域的高度
 m_pIPicture->Render(*pDC, 0, 0, m_rcBox.Width(), m_rcBox.Height(), xSrc, ySrc, cxSrc, cySrc, NULL);
}

4、将IPicture中的图片保存起来
BOOL SaveToFileFromIPicture(LPCSTR szFileName, IPicture *pPic)
{
 // Create ILockBytes Buffer
 ILockBytes *plkbyt = NULL;
 CreateILockBytesOnHGlobal(NULL, TRUE, &plkbyt);

 // Create IStorage
 IStorage   *pStorage = NULL;
 HRESULT hr = ::StgCreateDocfileOnILockBytes(plkbyt,
  STGM_SHARE_EXCLUSIVE | STGM_CREATE | STGM_READWRITE, 0, &pStorage);
 if (FAILED(hr))
 {
  plkbyt->Release();
  plkbyt = NULL;
  return FALSE;
 }

 // Create IStream
 IStream    *pStream = NULL;
 hr = pStorage->CreateStream(L"PICTURE",
  STGM_SHARE_EXCLUSIVE | STGM_CREATE | STGM_READWRITE, 0, 0, &pStream);
 if (FAILED(hr))
 {
  pStorage->Release();
  pStorage = NULL;
  plkbyt->Release();
  plkbyt = NULL;
  return FALSE;
 }
 
 // Copy Data Stream
 long  lSize;
 hr = pPic->SaveAsFile(pStream, TRUE, &lSize); 
 if (FAILED(hr))
 {
  pStream->Release();
  pStream = NULL;
  pStorage->Release();
  pStorage = NULL;
  plkbyt->Release();
  plkbyt = NULL;
  return FALSE;
 }
 // Get Statistics For Final Size Of Byte Array
 STATSTG  statStg;
 hr = plkbyt->Stat(&statStg, STATFLAG_NONAME);
 if (FAILED(hr))
 {
  pStream->Release();
  pStream = NULL;
  pStorage->Release();
  pStorage = NULL;
  plkbyt->Release();
  plkbyt = NULL;
  return FALSE;
 }

 // calculate "Pure" Picture Data, Must Be In a 512 Blocks...
 double  dbSkipFloat = (double(lSize) / 512);   
 DWORD  dwPicDataSize = 0;
 if(dbSkipFloat > DWORD(dbSkipFloat)) 
 {
  dwPicDataSize = (DWORD)dbSkipFloat + 1;
 }
 else 
 {
  dwPicDataSize = (DWORD)dbSkipFloat;
 }
 dwPicDataSize = dwPicDataSize * 512; 
 // Allocate Only The "Pure" Picture Data
 BYTE  *pPicDataBuffer = (BYTE*)malloc(dwPicDataSize);
 if (pPicDataBuffer == NULL)
 {
  pStream->Release();
  pStream = NULL;
  plkbyt->Release();
  pStorage->Release();
  pStorage = NULL;
  plkbyt = NULL;
  return FALSE;
 }
 
 // Read "Pure" Picture Data to Buffer
 _ULARGE_INTEGER ulOffset;
 ulOffset.LowPart = 0;
 ulOffset.HighPart = 0;
 ulOffset.QuadPart = (DWORD)(statStg.cbSize.QuadPart - dwPicDataSize);
 DWORD dwRealDataSize;
 hr = plkbyt->ReadAt(ulOffset, pPicDataBuffer, dwPicDataSize, &dwRealDataSize);
 if (FAILED(hr))
 {
  free(pPicDataBuffer);
  pPicDataBuffer = NULL;
  pStream->Release();
  pStream = NULL;
  pStorage->Release();
  pStorage = NULL;
  plkbyt->Release();
  plkbyt = NULL;
  return FALSE;
 }
 
 // Save "Pure" Picture Data to file
 CFile  fBmp; 
 CFileException e;
 if (!fBmp.Open(szFileName, CFile::typeBinary | CFile::modeCreate | CFile::modeWrite, &e))
 {
  free(pPicDataBuffer);
  pPicDataBuffer = NULL;
  pStream->Release();
  pStream = NULL;
  pStorage->Release();
  pStorage = NULL;
  plkbyt->Release();
  plkbyt = NULL;
  return FALSE;
 }
 fBmp.Write(pPicDataBuffer, dwRealDataSize);
 fBmp.Close();
 free(pPicDataBuffer);
 pPicDataBuffer = NULL;
 pStream->Release();
 pStream = NULL;
 pStorage->Release();
 pStorage = NULL;
 plkbyt->Release();
 plkbyt = NULL;
 return TRUE;
}

5、将IPicture中图片按规定的尺寸保存
BOOL CIPictureDlg::Save2File(LPCSTR szFileName, IPicture *pPic, int nWidth, int nHeight)
{
 // create a new IPicture
 OLE_HANDLE hPic = NULL;
 if (FAILED(pPic->get_Handle(&hPic)))
 {
  return FALSE;
 }
 HBITMAP hBmp = (HBITMAP)CopyImage((HANDLE)hPic,
   IMAGE_BITMAP, 
   nWidth, 
   nWidth, 
   LR_CREATEDIBSECTION);
 if (hBmp == NULL)
 {
  return FALSE;
 }
 PICTDESC picDesc;
 picDesc.cbSizeofstruct = sizeof(PICTDESC);
 picDesc.picType = PICTYPE_BITMAP;
 picDesc.bmp.hbitmap = hBmp;

 IPicture *pNewPic = NULL;
 if (SUCCEEDED(OleCreatePictureIndirect(&picDesc, IID_IPicture, FALSE, (LPVOID *)&pNewPic)))
 {
  // Save to file
  Save2File(szFileName, pNewPic);
  pNewPic->Release();
  pNewPic = NULL;
  DeleteObject(hBmp);
  hBmp = NULL;
  return TRUE;
 }
 DeleteObject(hBmp);
 hBmp = NULL;
 return FALSE;
}

 

下面是有关 IPicture 的方法描述：

方法	描述
get_Handle	返回图像对象的Windows GDI句柄
get_Hpal	返回图像对象当前使用的调色板拷贝
get_Type	返回当前图像对象的的图像类型
get_Width	返回当前图像对象的图像宽度
get_Height	返回当前图像对象的图像高度
Render	在指定的位置、指定的设备上下文上绘制指定的图像部分
set_Hpal	设置当前图像的调色板
get_CurDC	返回当前选中这个图像的设备上下文
SelectPicture	将一个位图图像选入给定的设备上下文，返回选中图像的设备上下文和图像的GDI句柄
get_KeepOriginalForma	返回图像对象KeepOriginalFormat 属性的当前值
put_KeepOriginalFormat	设置图像对象的KeepOriginalFormat 属性
PictureChanged	通知图像对象它的图像资源改变了
SaveAsFile	将图像数据存储到流中，格式与存成文件格式相同
get_Attributes	返回图像位属性当前的设置

 

 

=========================================end=========================================================

 

1、利用IPicture接口加载、显示图片

IPicture接口管理一个图片对象和它的属性。图片对象提供对Bitmap Icon Metafile的语言不相关的抽象支持。图像对象的主要接口是IPicture和IPictureDisp。IPictureDisp从IDispatch继承，提供了通过自动化访问图片属性的能力。图片对象可通过OleCreatePictureIndirect创建。关于IPicture支持的其他接口和方法可以看MSDN，一般创建图片对象可以用OleLoadPicture函数，它简化了基于流内容创建图片对象。

IPicture接口管理一个图片对象和它的属性。图片对象提供对Bitmap Icon Metafile的语言不相关的抽象支持。图像对象的主要接口是IPicture和IPictureDisp。IPictureDisp从IDispatch继承，提供了通过自动化访问图片属性的能力。图片对象可通过OleCreatePictureIndirect创建。关于IPicture支持的其他接口和方法可以看MSDN，一般创建图片对象可以用OleLoadPicture函数，它简化了基于流内容创建图片对象。下面的代码中有两个未定义的变量是FilePath和hDC。
//FilePath是从外部传入的图片路径
//打开文件
HANDLE hFile = CreateFile(FilePath, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
_ASSERTE(INVALID_HANDLE_VALUE != hFile);
//取文件大小
DWORD dwFileSize = GetFileSize(hFile, NULL);
_ASSERTE(-1 != dwFileSize);
LPVOID pvData = NULL;
//分配内存，准备读入图片文件的数据
//GlobalAlloc从堆分配指定字节的内存区域
HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, dwFileSize);
_ASSERTE(NULL != hGlobal);
//GlobalLock函数锁住一个全局的内存对象同时返回一个指向对象首字节的指针
pvData = GlobalLock(hGlobal);
_ASSERTE(NULL != pvData);
DWORD dwBytesRead = 0;
//读取文件的数据到分配的全局内存
BOOL bRead = ReadFile(hFile, pvData, dwFileSize, &dwBytesRead, NULL);
_ASSERTE(FALSE != bRead);
GlobalUnlock(hGlobal);
CloseHandle(hFile);

//到此，我们已经把文件的数据读到了内存当中

LPSTREAM pstm = NULL;
//从全局内存创建IStream接口指针
HRESULT hr = CreateStreamOnHGlobal(hGlobal, TRUE, &pstm);
_ASSERTE(SUCCEEDED(hr) && pstm);
//根据图片文件创建IPicture接口指针
hr = ::OleLoadPicture(pstm, dwFileSize, FALSE, IID_IPicture, (LPVOID *)&gpPicture);
_ASSERTE(SUCCEEDED(hr) && gpPicture); 
pstm->Release();

//至此，IPicture接口建立好，下面开始画图片
//hDC是外部传入的画图设备
long hmWidth;
long hmHeight;
gpPicture->get_Width(&hmWidth);
gpPicture->get_Height(&hmHeight);
//转换himetric距离为pixels距离，1英寸=25.4毫米
int nWidth = MulDiv(hmWidth, GetDeviceCaps(hDC, LOGPIXELSX), 2540);
int nHeight = MulDiv(hmHeight, GetDeviceCaps(hDC, LOGPIXELSY), 2540);
RECT rc;
GetClientRect(hWnd, &rc);
//IPicture::Render显示图片
gpPicture->Render(hDC, 0, 0, nWidth, nHeight, 0, hmHeight, hmWidth, -hmHeight, &rc);

2、C++如何调用图片
有很多办法 ，比如用IPicture，用CBitmap //MFC，更直接的是，用File进行文件操作，用BitBlt显示，具体代码你用以上关键字Google下 
这里给你推荐几个,末尾给你附一个网上可以找到的CPicture类（需MFC支持）： 
-------IPicture 
// pDoc为文档对象指针 
// pDC为设备描述表指针 

::CoInitialize(NULL); // COM 初始化 
HRESULT hr; 
CFile file; 

file.Open(pDoc->GetPathName(), CFile::modeRead | CFile::shareDenyNone ); // 读入文件内容
DWORD dwSize = file.GetLength(); 
HGLOBAL hMem = ::GlobalAlloc( GMEM_MOVEABLE, dwSize ); 
LPVOID lpBuf = ::GlobalLock( hMem ); 
file.ReadHuge( lpBuf, dwSize ); 
file.Close(); 
::GlobalUnlock( hMem ); 

IStream * pStream = NULL; 
IPicture * pPicture = NULL; 

// 由 HGLOBAL 得到 IStream，参数 TRUE 表示释放 IStream 的同时，释放内存 
hr = ::CreateStreamOnHGlobal( hMem, TRUE, &pStream ); 
ASSERT ( SUCCEEDED(hr) ); 

hr = ::OleLoadPicture( pStream, dwSize, TRUE, IID_IPicture, ( LPVOID * )&pPicture );
ASSERT(hr==S_OK); 

long nWidth,nHeight; // 宽高，MM_HIMETRIC 模式，单位是0.01毫米 
pPicture->get_Width( &nWidth ); // 宽 
pPicture->get_Height( &nHeight ); // 高 

CRect rect; 
GetClientRect(&rect); 

CSize sz( nWidth, nHeight ); 
pDC->HIMETRICtoDP( &sz ); // 转换 MM_HIMETRIC 模式单位为 MM_TEXT 像素单位 
long x, y, cx, cy; 

// 原始大小 
/* 
cx = sz.cx; 
cy = sz.cy; 
x = rect.Width() / 2 - cx / 2; 
y = rect.Height() / 2 - cy / 2; 
*/ 

// 自动适应窗口 
double fRatePic, fRateWnd; 
fRatePic = (double)sz.cx / (double)sz.cy; 
fRateWnd = (double)rect.Width() / (double)rect.Height(); 
if (fRatePic > fRateWnd) 
{ 
cx = rect.Width(); 
cy = (long)(rect.Width() / fRatePic); 
} 
else 
{ 
cx = (long)(rect.Height() * fRatePic); 
cy = rect.Height(); 
} 
if (cx == rect.Width()) 
{ 
x = 0; 
y = rect.Height() / 2 - cy / 2; 
} 
if (cy == rect.Height()) 
{ 
x = rect.Width() / 2 - cx / 2; 
y = 0; 
} 

pPicture->Render(pDC->m_hDC, x, y, cx, cy, 
0, nHeight, nWidth, -nHeight, NULL); 

if ( pPicture ) pPicture->Release();// 释放 IPicture 指针 
if ( pStream ) pStream->Release(); // 释放 IStream 指针，同时释放了 hMem 

::CoUninitialize(); 

--------------------------------CBitmap: 
HBITMAP bitmap; 
bitmap=(HBITMAP)LoadImage(AfxGetInstanceHandle(),strFileName,IMAGE_BITMAP,0,0,LR_LOADFROMFILE);
m_backBitmap.DeleteObject(); 
if(!m_backBitmap.Attach(bitmap)) 
{ 
MessageBox("导入背景图失败!","提示",MB_OK); 
return; 
} 

----------------------File：略 
前提是你要知道图片的编码格式 
一般比较简单的是BMP,包括 
BITMAPFILEHEADER，BITMAPINFO,BITMAPINFOHEADER 
如果图片采用了压缩算法可能会麻烦一点， 
关于详细情况你也以Google一下 

附CPicture(引用自网上） 

// Picture.h: interface for the CPicture 
#ifndef PICTURE_H 
#ifndef picture_h 

#define PICTURE_H 
#define picture_h 


#if _MSC_VER > 1000 
#pragma once 
#endif // _MSC_VER > 1000 


class CPicture 
{ 
public: 
CPicture(); 
virtual ~CPicture(); 

public: 
BOOL LoadPicture(UINT nResource, LPCTSTR lpszResType) 
{return LoadPicture(MAKEINTRESOURCE(nResource), lpszResType);} 
BOOL LoadPictureFromFile(LPCTSTR lpszFileName); 
BOOL LoadPicture(LPCTSTR lpszResource,LPCTSTR lpszResType); 
BOOL IsValid(){ return m_pPic!=NULL;} 
CSize GetSize(){return m_size;} 
void Draw(CDC* pDC, LPCRECT lprcDest, LPCRECT lprcSrc); 
void Draw(CDC* pDC, int xDest,int yDest, int cxDest, int cyDest , 
int xSrc ,int ySrc ,int cxSrc ,int cySrc); 

void Release(); 

protected: 
IPicture* m_pPic; 

OLE_XSIZE_HIMETRIC _w_him; 
OLE_YSIZE_HIMETRIC _h_him; 

CSize m_size; 

protected: 
void CalcSize(); 
}; 


#endif // define picture_h 
#endif // define PICTURE_H 



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

#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));
}