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php网站页面转wordpress,家装在线设计平台,做家教什么网站,临沂网站建设方案书作者的话#xff1a;GDI看起来是更好的解决方案#xff0c;但是IPicture的OLE实现更简单。 问题的起源 很久以来#xff0c;我都被一个问题困扰。关于程序中显示图像的问题#xff0c;我在网络上搜索了很长时间#xff0c;找到了无数的解决方案#xff0c;比如分析文件格… 作者的话GDI看起来是更好的解决方案但是IPicture的OLE实现更简单。 问题的起源 很久以来我都被一个问题困扰。关于程序中显示图像的问题我在网络上搜索了很长时间找到了无数的解决方案比如分析文件格式,直接读取文件的;用控件的(柯达的ImgEdit控件);以及不知道内部实现方法的库ImageLoad。而我找到的方法大都不容易使用特别是那些直接按位读取图像的。很多时候我不得不为每种文件格式写一段代码。 目前我的解决方案 在使用了多种图形显示方案之后我决定使用微软提供的IPicture的OLE实现来显示图像。由于MFC的CPictureHolder类是这个实现的一个封装而且自带了从图像句柄读入图形的功能所以我的工作以CPictureHolder类为基础。要是你不喜欢MFC的话你可以把CPictureHolder类的代码从MFC的源代码里面分离出来单独使用。 CPictureHolder类的设计目的是实现ActiveX控件的Picture属性允许用户在控件中显示图像。作为默认的Picture属性开发者可以指定一个位图(Bitmap)图标(Icon)或者图元文件(Metafile)来显示。虽然微软的文档中并未说明支持JPEG格式的图像但是经过我的测试在Windows98以上以及Windows2000中它实际上是支持JPEG格式的根据微软的文档支持的图像格式有BMP,DIB,WMFICO。笔者并未测试其他图像格式是否被支持例如PNG、GIF、PCX等等有兴趣的读者可以去自己测试一下。(据111222的文档http://www.csdn.net/develop/read_article.asp?id10632也支持GIF格式) 由于CPictureHolder类并未实现从文件/资源/内存读入图像使用起来很不方便所以我扩展了这个类以支持上述功能。部分工作基于Dr. Yovav Gad, SourcesSuperMain.com www.SuperMain.com和http://www.thecodeproject.com/bitmap/cpicture.asp的代码。 要使用CPictureHolder类必须先包含afxctl.h 源代码 #include class CPicture:public CPictureHolder { public:  BOOL Load(CString sFilePathName);//从文件读取图像  BOOL Load(HINSTANCE hInstance,LPCTSTR lpszResourceName, LPCSTR ResourceType);//从资源读取图像  BOOL LoadPictureData(BYTE* pBuffer, int nSize);//从内存读取图像  BOOL SaveAsBitmap(CString sFilePathName);//写入到BMP文件  void Render(CDC* pDC, LPRECT pDrawRect/目标矩形单位是逻辑坐标单位/, LPRECT pSrcRectNULL/来源矩形单位是0.01毫米,如果为空则拉伸整个图像到目标矩形/,LPCRECT prcWBoundsNULL/图元文件专用绑定矩形/);//在给定的DC上画图 CPicture(); virtual ~CPicture(); void  UnloadPicture();//释放图像作用同CPictureHolder::~CPictureHolder()public: LONG      get_Height(); // 以0.01毫米为单位的图像高度 LONG      get_Width();  // 以0.01毫米为单位的图像宽度}; //—————————————————————————–// 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::UnloadPicture()//{ if(m_pPict ! NULL){  m_pPict-Release();  m_pPict NULL; }}//—————————————————————————–// 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(HINSTANCE hInstance,LPCTSTR lpszResourceName, LPCSTR ResourceType)//{ HGLOBAL  hGlobal NULL; HRSRC  hSource NULL; LPVOID  lpVoid  NULL; int   nSize   0; BOOL  bResultFALSE; if(m_pPict ! NULL) UnloadPicture(); // Important - Avoid Leaks…  hSource FindResource(hInstance, lpszResourceName, 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(hInstance, 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(hInstance, hSource); if(LoadPictureData((BYTE)hGlobal, nSize)) bResult TRUE;  UnlockResource(hGlobal); // 16Bit Windows Needs This FreeResource(hGlobal); // 16Bit Windows Needs This (32Bit - Automatic Release) 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)//{ if(!PathFileExists(sFilePathName))return FALSE; BOOL bResult FALSE; CFile PictureFile; CFileException e; int nSize 0;  if(m_pPict ! NULL) UnloadPicture(); // 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)   {   if(LoadPictureData(pBuffer, nSize)) bResult TRUE;   }   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;  } 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); memcpy(pData, pBuffer, nSize); GlobalUnlock(hGlobal);  IStream* pStream NULL;  if(CreateStreamOnHGlobal(hGlobal, TRUE, pStream) S_OK)  {  HRESULT hr;  if((hr OleLoadPicture(pStream, nSize, FALSE, IID_IPicture, (LPVOID )m_pPict)) 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);} //—————————————————————————–// Does:   Draw The Loaded Picture Direct To The Client DC// ~~~~//// Note:   Bigger OR Smaller Dimentions Than The Original Picture Size// ~~~~    Will Draw The Picture Streached To Its New Given NEW Dimentions…//// InPut:  pDC - Given DC To Draw On// ~~~~~   pSrcRect- Dimentions Of The Picture To Draw From(As a Rectangle)//   DrawRect - Dimentions Of The Picture To Draw To(As a Rectangle)// OutPut: TRUE If Succeeded…// ~~~~~~//—————————————————————————–// void CPicture::Render(CDC pDC, LPRECT pDrawRect, LPRECT pSrcRect/NULL/,LPCRECT prcWBounds/NULL/){    if (pDC NULL || m_pPict NULL) return ;     CRect recrDest(pDrawRect);     long Width  0;    long Height 0;    m_pPict-get_Width(Width);    m_pPict-get_Height(Height);  CRect SrcRect(0,0,Width,Height);  if(pSrcRect){  SrcRect*pSrcRect; } CRect DrawRect(pDrawRect);    HRESULT hrP NULL;     hrP m_pPict-Render(pDC-m_hDC,                      DrawRect.left,                  // Left                      DrawRect.top,                   // Top                      DrawRect.Width(), // Right                      DrawRect.Height(), // Bottom                      SrcRect.left,                      SrcRect.top,                      SrcRect.Width(),                      SrcRect.Height(),                      prcWBounds);     if (SUCCEEDED(hrP)) return; AfxThrowMemoryException();    return;}//—————————————————————————–// Does:   Saves The Picture That Is Stored In The IPicture Object As a Bitmap// ~~~    (Converts From Any Known Picture Type To a Bitmap / Icon File)//// InPut:  sFilePathName - Path And FileName Target To Save// ~~~~//// OutPut: TRUE If Succeeded…// ~~~~~~//—————————————————————————–BOOL CPicture::SaveAsBitmap(CString sFilePathName)//{ BOOL bResult FALSE; ILockBytes *Buffer 0; IStorage   *pStorage 0; IStream    *FileStream 0; BYTE    *BufferBytes; STATSTG  BytesStatistics; DWORD  OutData; long  OutStream; CFile  BitmapFile; CFileException e; double  SkipFloat 0; DWORD  ByteSkip 0; _ULARGE_INTEGER RealData;  CreateILockBytesOnHGlobal(NULL, TRUE, Buffer); // Create ILockBytes Buffer  HRESULT hr ::StgCreateDocfileOnILockBytes(Buffer,     STGM_SHARE_EXCLUSIVE | STGM_CREATE | STGM_READWRITE, 0, pStorage);  hr pStorage-CreateStream(LPICTURE,   STGM_SHARE_EXCLUSIVE | STGM_CREATE | STGM_READWRITE, 0, 0, FileStream);  m_pPict-SaveAsFile(FileStream, TRUE, OutStream); // Copy Data Stream FileStream-Release(); pStorage-Release(); Buffer-Flush();  // Get Statistics For Final Size Of Byte Array Buffer-Stat(BytesStatistics, STATFLAG_NONAME);  // Cut UnNeeded Data Coming From SaveAsFile() (Leave Only Pure Picture Data) SkipFloat (double(OutStream) / 512); // Must Be In a 512 Blocks… if(SkipFloat DWORD(SkipFloat)) ByteSkip (DWORD)SkipFloat 1; else ByteSkip (DWORD)SkipFloat; ByteSkip ByteSkip * 512; // Must Be In a 512 Blocks…  // Find Difference Between The Two Values ByteSkip (DWORD)(BytesStatistics.cbSize.QuadPart - ByteSkip);  // Allocate Only The Pure Picture Data RealData.LowPart 0; RealData.HighPart 0; RealData.QuadPart ByteSkip; BufferBytes (BYTE*)malloc(OutStream); if(BufferBytes NULL)  {  Buffer-Release();  HWND hWnd AfxGetApp()-GetMainWnd()-m_hWnd;  MessageBoxEx(hWnd, Can not allocate enough memory/t, ERROR_TITLE, MB_OK | MB_ICONSTOP, LANG_ENGLISH);  }  Buffer-ReadAt(RealData, BufferBytes, OutStream, OutData);  if(BitmapFile.Open(sFilePathName, CFile::typeBinary | CFile::modeCreate | CFile::modeWrite, e))  {  BitmapFile.Write(BufferBytes, OutData);  BitmapFile.Close();  bResult TRUE;  } else // Write File 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;  }  Buffer-Release(); free(BufferBytes);  return(bResult);} LONG      CPicture::get_Height(){ LONG     nHeight 0;  if (m_pPict ! NULL) {  m_pPict-get_Height(nHeight); }  return nHeight;}LONG      CPicture::get_Width(){ LONG     nWidth 0;  if (m_pPict ! NULL) {  m_pPict-get_Width(nWidth); }  return nWidth; }