PictureEx.h和PictureEx.cpp源文件

http://www.bccn.net/Article/net/vcnet/jszl/200709/6386.html　

近日，看到网上不少朋友要PictureEx.h和PictureEx.cpp源文件，于是就在网上找了一下，还真不多，整理了一下，发布出来，供大家查看和使用。

PictureEx.h

//////////////////////////////////////////////////////////////////////// PictureEx.cpp: implementation of the CPictureEx class.//// Picture displaying control with support for the following formats:// GIF (including animated GIF87a and GIF89a), JPEG, BMP, WMF, ICO, CUR// // Written by Oleg Bykov ([e-mail])// Copyright (c) 2001//// To use CPictureEx, follow these steps://   - place a static control on your dialog (either a text or a bitmap)//   - change its identifier to something else (e.g. IDC_MYPIC)//   - associate a CStatic with it using ClassWizard//   - in your dialog's header file replace CStatic with CPictureEx//     (don't forget to #include "PictureEx.h" and add //     PictureEx.h and PictureEx.cpp to your project)//   - call one of the overloaded CPictureEx::Load() functions somewhere//     (OnInitDialog is a good place to start)//   - if the preceding Load() succeeded call Draw()//  // You can also add the control by defining a member variable of type // CPictureEx, calling CPictureEx::Create (derived from CStatic), then // CPictureEx::Load and CPictureEx::Draw.//// By default, the control initializes its background to COLOR_3DFACE// (see CPictureEx::PrepareDC()). You can change the background by// calling CPictureEx::SetBkColor(COLORREF) after CPictureEx::Load().//// I decided to leave in the class the functions to write separate frames from // animated GIF to disk. If you want to use them, uncomment #define GIF_TRACING // and an appropriate section in CPictureEx::Load(HGLOBAL, DWORD). These functions // won't be compiled and linked to your project unless you uncomment #define GIF_TRACING,// so you don't have to worry.// // Warning: this code hasn't been subject to a heavy testing, so// use it on your own risk. The author accepts no liability for the // possible damage caused by this code.//// Version 1.0  7 Aug 2001//              Initial release//// Version 1.1  6 Sept 2001//              ATL version of the class//// Version 1.2  14 Oct 2001//              - Fixed a problem with loading GIFs from resources//                in MFC-version of the class for multi-modules apps.//                Thanks to Ruben Avila-Carretero for finding this out.////              - Got rid of waitable timer in ThreadAnimation()//                Now CPictureEx[Wnd] works in Win95 too.//                Thanks to Alex Egiazarov and Wayne King for the idea.////              - Fixed a visual glitch of using SetBkColor.//                Thanks to Kwangjin Lee for finding this out.//// Version 1.3  10 Nov 2001//              - Fixed a DC leak. One DC leaked per each UnLoad()//                (forgot to put a ReleaseDC() in the end of //                CPictureExWnd::PrepareDC() function).////              - Now it is possible to set a clipping rectangle using//                CPictureEx[Wnd]::SetPaintRect(const LPRECT) function.//                The LPRECT parameter tells the class what portion of//                a picture should it display. If the clipping rect is //                not set, the whole picture is shown.//                Thanks to Fabrice Rodriguez for the idea.////              - Added support for Stop/Draw. Now you can Stop() an//                animated GIF, then Draw() it again, it will continue//                animation from the frame it was stopped on. You can //                also know if a GIF is currently playing with the //                IsPlaying() function.//             //              - Got rid of math.h and made m_bExitThread volatile. //                Thanks to Piotr Sawicki for the suggestion.////////////////////////////////////////////////////////////////////////#if !defined(AFX_PICTUREEX_H__0EFE5DE0_7B68_4DB7_8B34_5DC634948438__INCLUDED_)#define AFX_PICTUREEX_H__0EFE5DE0_7B68_4DB7_8B34_5DC634948438__INCLUDED_#if _MSC_VER > 1000#pragma once#endif // _MSC_VER > 1000#include <vector>//#define GIF_TRACING  // uncomment it if you want detailed TRACEsclass CPictureEx : public CStatic{public:struct TFrame    // structure that keeps a single frame info{ IPicture *m_pPicture;  // pointer to the interface used for drawing SIZE     m_frameSize; SIZE     m_frameOffset; UINT     m_nDelay;     // delay (in 1/100s of a second) UINT     m_nDisposal;  // disposal method};#pragma pack(1)   // turn byte alignment onenum GIFBlockTypes{ BLOCK_UNKNOWN, BLOCK_APPEXT, BLOCK_COMMEXT, BLOCK_CONTROLEXT, BLOCK_PLAINTEXT, BLOCK_IMAGE, BLOCK_TRAILER};enum ControlExtValues // graphic control extension packed field values{ GCX_PACKED_DISPOSAL,  // disposal method GCX_PACKED_USERINPUT, GCX_PACKED_TRANSPCOLOR};enum LSDPackedValues  // logical screen descriptor packed field values{ LSD_PACKED_GLOBALCT, LSD_PACKED_CRESOLUTION, LSD_PACKED_SORT, LSD_PACKED_GLOBALCTSIZE};enum IDPackedValues   // image descriptor packed field values{ ID_PACKED_LOCALCT, ID_PACKED_INTERLACE, ID_PACKED_SORT, ID_PACKED_LOCALCTSIZE};struct TGIFHeader       // GIF header  { char m_cSignature[3]; // Signature - Identifies the GIF Data Stream        // This field contains the fixed value 'GIF' char m_cVersion[3]; // Version number. May be one of the following:      // "87a" or "89a"};struct TGIFLSDescriptor // Logical Screen Descriptor{ WORD m_wWidth; // 2 bytes. Logical screen width WORD m_wHeight; // 2 bytes. Logical screen height unsigned char m_cPacked;      // packed field  unsigned char m_cBkIndex;     // 1 byte. Background color index unsigned char m_cPixelAspect; // 1 byte. Pixel aspect ratio inline int GetPackedValue(enum LSDPackedValues Value);};struct TGIFAppExtension // application extension block{ unsigned char m_cExtIntroducer; // extension introducer (0x21) unsigned char m_cExtLabel; // app. extension label (0xFF) unsigned char m_cBlockSize; // fixed value of 11 char m_cAppIdentifier[8];   // application identifier char m_cAppAuth[3];  // application authentication code};struct TGIFControlExt // graphic control extension block{ unsigned char m_cExtIntroducer; // extension introducer (0x21) unsigned char m_cControlLabel;  // control extension label (0xF9) unsigned char m_cBlockSize; // fixed value of 4 unsigned char m_cPacked;    // packed field WORD m_wDelayTime; // delay time unsigned char m_cTColorIndex; // transparent color index unsigned char m_cBlockTerm;   // block terminator (0x00)public: inline int GetPackedValue(enum ControlExtValues Value);};struct TGIFCommentExt  // comment extension block{ unsigned char m_cExtIntroducer; // extension introducer (0x21) unsigned char m_cCommentLabel;  // comment extension label (0xFE)};struct TGIFPlainTextExt // plain text extension block{ unsigned char m_cExtIntroducer;  // extension introducer (0x21) unsigned char m_cPlainTextLabel; // text extension label (0x01) unsigned char m_cBlockSize; // fixed value of 12 WORD m_wLeftPos;    // text grid left position WORD m_wTopPos;     // text grid top position WORD m_wGridWidth;  // text grid width WORD m_wGridHeight; // text grid height unsigned char m_cCellWidth;  // character cell width unsigned char m_cCellHeight; // character cell height unsigned char m_cFgColor; // text foreground color index unsigned char m_cBkColor; // text background color index};struct TGIFImageDescriptor // image descriptor block{ unsigned char m_cImageSeparator; // image separator byte (0x2C) WORD m_wLeftPos; // image left position WORD m_wTopPos;  // image top position WORD m_wWidth;   // image width WORD m_wHeight;  // image height unsigned char m_cPacked; // packed field inline int GetPackedValue(enum IDPackedValues Value);};#pragma pack() // turn byte alignment offpublic: BOOL GetPaintRect(RECT *lpRect); BOOL SetPaintRect(const RECT *lpRect); CPictureEx(); virtual ~CPictureEx(); void Stop();   // stops animation void UnLoad(); // stops animation plus releases all resources BOOL IsGIF() const; BOOL IsPlaying() const; BOOL IsAnimatedGIF() const; SIZE GetSize() const; int GetFrameCount() const; COLORREF GetBkColor() const; void SetBkColor(COLORREF clr); // draws the picture (starts an animation thread if needed) // if an animation was previously stopped by Stop(), // continues it from the last displayed frame BOOL Draw(); // loads a picture from a file // i.e. Load(_T("mypic.gif")); BOOL Load(LPCTSTR szFileName); // loads a picture from a global memory block (allocated by GlobalAlloc) // Warning: this function DOES NOT free the global memory, pointed to by hGlobal BOOL Load(HGLOBAL hGlobal, DWORD dwSize); // loads a picture from a program resource // i.e. Load(MAKEINTRESOURCE(IDR_MYPIC),_T("GIFTYPE")); BOOL Load(LPCTSTR szResourceName,LPCTSTR szResourceType);protected:#ifdef GIF_TRACING void EnumGIFBlocks(); void WriteDataOnDisk(CString szFileName, HGLOBAL hData, DWORD dwSize);#endif // GIF_TRACING RECT m_PaintRect; SIZE m_PictureSize; COLORREF m_clrBackground; UINT m_nCurrFrame; UINT m_nDataSize; UINT m_nCurrOffset; UINT m_nGlobalCTSize; BOOL m_bIsGIF; BOOL m_bIsPlaying; volatile BOOL m_bExitThread; BOOL m_bIsInitialized; HDC m_hMemDC; HDC m_hDispMemDC; HBITMAP m_hDispMemBM; HBITMAP m_hDispOldBM; HBITMAP m_hBitmap; HBITMAP m_hOldBitmap; HANDLE m_hThread; HANDLE m_hExitEvent; IPicture * m_pPicture; TGIFHeader * m_pGIFHeader; unsigned char * m_pRawData; TGIFLSDescriptor * m_pGIFLSDescriptor; std::vector<TFrame> m_arrFrames; void ThreadAnimation(); static UINT WINAPI _ThreadAnimation(LPVOID pParam); int GetNextBlockLen() const; BOOL SkipNextBlock(); BOOL SkipNextGraphicBlock(); BOOL PrepareDC(int nWidth, int nHeight); void ResetDataPointer(); enum GIFBlockTypes GetNextBlock() const; UINT GetSubBlocksLen(UINT nStartingOffset) const; HGLOBAL GetNextGraphicBlock(UINT *pBlockLen, UINT *pDelay,   SIZE *pBlockSize, SIZE *pBlockOffset, UINT *pDisposal); // Generated message map functions //{{AFX_MSG(CPictureEx) afx_msg void OnDestroy(); afx_msg void OnPaint(); //}}AFX_MSG  DECLARE_MESSAGE_MAP()};#endif // !defined(AFX_PICTUREEX_H__0EFE5DE0_7B68_4DB7_8B34_5DC634948438__INCLUDED_)

PictureEx.cpp

//////////////////////////////////////////////////////////////////////// PictureEx.cpp: implementation of the CPictureEx class.//// Picture displaying control with support for the following formats:// GIF (including animated GIF87a and GIF89a), JPEG, BMP, WMF, ICO, CUR// // Written by Oleg Bykov ([e-mail])// Copyright (c) 2001//// To use CPictureEx, follow these steps://   - place a static control on your dialog (either a text or a bitmap)//   - change its identifier to something else (e.g. IDC_MYPIC)//   - associate a CStatic with it using ClassWizard//   - in your dialog's header file replace CStatic with CPictureEx//     (don't forget to #include "PictureEx.h" and add //     PictureEx.h and PictureEx.cpp to your project)//   - call one of the overloaded CPictureEx::Load() functions somewhere//     (OnInitDialog is a good place to start)//   - if the preceding Load() succeeded call Draw()//  // You can also add the control by defining a member variable of type // CPictureEx, calling CPictureEx::Create (derived from CStatic), then // CPictureEx::Load and CPictureEx::Draw.//// By default, the control initializes its background to COLOR_3DFACE// (see CPictureEx::PrepareDC()). You can change the background by// calling CPictureEx::SetBkColor(COLORREF) after CPictureEx::Load().//// I decided to leave in the class the functions to write separate frames from // animated GIF to disk. If you want to use them, uncomment #define GIF_TRACING // and an appropriate section in CPictureEx::Load(HGLOBAL, DWORD). These functions // won't be compiled and linked to your project unless you uncomment #define GIF_TRACING,// so you don't have to worry.// // Warning: this code hasn't been subject to a heavy testing, so// use it on your own risk. The author accepts no liability for the // possible damage caused by this code.//// Version 1.0  7 Aug 2001//              Initial release//// Version 1.1  6 Sept 2001//              ATL version of the class//// Version 1.2  14 Oct 2001//              - Fixed a problem with loading GIFs from resources//                in MFC-version of the class for multi-modules apps.//                Thanks to Ruben Avila-Carretero for finding this out.////              - Got rid of waitable timer in ThreadAnimation()//                Now CPictureEx[Wnd] works in Win95 too.//                Thanks to Alex Egiazarov and Wayne King for the idea.////              - Fixed a visual glitch of using SetBkColor.//                Thanks to Kwangjin Lee for finding this out.//// Version 1.3  10 Nov 2001//              - Fixed a DC leak. One DC leaked per each UnLoad()//                (forgot to put a ReleaseDC() in the end of //                CPictureExWnd::PrepareDC() function).////              - Now it is possible to set a clipping rectangle using//                CPictureEx[Wnd]::SetPaintRect(const LPRECT) function.//                The LPRECT parameter tells the class what portion of//                a picture should it display. If the clipping rect is //                not set, the whole picture is shown.//                Thanks to Fabrice Rodriguez for the idea.////              - Added support for Stop/Draw. Now you can Stop() an//                animated GIF, then Draw() it again, it will continue//                animation from the frame it was stopped on. You can //                also know if a GIF is currently playing with the //                IsPlaying() function.//             //              - Got rid of math.h and made m_bExitThread volatile. //                Thanks to Piotr Sawicki for the suggestion.////////////////////////////////////////////////////////////////////////#include "stdafx.h"#include "PictureEx.h"#include <process.h>#ifdef _DEBUG#undef THIS_FILEstatic char THIS_FILE[]=__FILE__;#define new DEBUG_NEW#endif//////////////////////////////////////////////////////////////////////// Nested structures member functions//////////////////////////////////////////////////////////////////////inline int CPictureEx::TGIFControlExt::GetPackedValue(enum ControlExtValues Value){ int nRet = (int)m_cPacked; switch (Value) { case GCX_PACKED_DISPOSAL:  nRet = (nRet & 28) >> 2;  break; case GCX_PACKED_USERINPUT:  nRet = (nRet & 2) >> 1;  break; case GCX_PACKED_TRANSPCOLOR:  nRet &= 1;  break; }; return nRet;}inline int CPictureEx::TGIFLSDescriptor::GetPackedValue(enum LSDPackedValues Value){ int nRet = (int)m_cPacked; switch (Value) { case LSD_PACKED_GLOBALCT:  nRet = nRet >> 7;  break; case LSD_PACKED_CRESOLUTION:  nRet = ((nRet & 0x70) >> 4) + 1;  break; case LSD_PACKED_SORT:  nRet = (nRet & 8) >> 3;  break; case LSD_PACKED_GLOBALCTSIZE:  nRet &= 7;  break; }; return nRet;}inline int CPictureEx::TGIFImageDescriptor::GetPackedValue(enum IDPackedValues Value){ int nRet = (int)m_cPacked; switch (Value) { case ID_PACKED_LOCALCT:  nRet >>= 7;  break; case ID_PACKED_INTERLACE:  nRet = ((nRet & 0x40) >> 6);  break; case ID_PACKED_SORT:  nRet = (nRet & 0x20) >> 5;  break; case ID_PACKED_LOCALCTSIZE:  nRet &= 7;  break; }; return nRet;}//////////////////////////////////////////////////////////////////////// Construction/Destruction//////////////////////////////////////////////////////////////////////CPictureEx::CPictureEx(){ // check structures size ASSERT(sizeof(TGIFImageDescriptor) == 10); ASSERT(sizeof(TGIFAppExtension)    == 14); ASSERT(sizeof(TGIFPlainTextExt)    == 15); ASSERT(sizeof(TGIFLSDescriptor)    ==  7); ASSERT(sizeof(TGIFControlExt)    ==  8); ASSERT(sizeof(TGIFCommentExt)    ==  2); ASSERT(sizeof(TGIFHeader)     ==  6); m_pGIFLSDescriptor = NULL; m_pGIFHeader    = NULL; m_pPicture     = NULL; m_pRawData     = NULL; m_hThread     = NULL; m_hBitmap          = NULL; m_hMemDC     = NULL; m_hDispMemDC       = NULL; m_hDispMemBM       = NULL; m_hDispOldBM       = NULL; m_bIsInitialized   = FALSE; m_bExitThread    = FALSE; m_bIsPlaying       = FALSE; m_bIsGIF     = FALSE; m_clrBackground    = RGB(255,255,255); // white by default m_nGlobalCTSize    = 0; m_nCurrOffset    = 0; m_nCurrFrame    = 0; m_nDataSize     = 0; m_PictureSize.cx = m_PictureSize.cy = 0; SetRect(&m_PaintRect,0,0,0,0); m_hExitEvent = CreateEvent(NULL,TRUE,FALSE,NULL);}CPictureEx::~CPictureEx(){ UnLoad(); CloseHandle(m_hExitEvent);}BEGIN_MESSAGE_MAP(CPictureEx, CStatic) //{{AFX_MSG_MAP(CPictureEx) ON_WM_DESTROY() ON_WM_PAINT() //}}AFX_MSG_MAPEND_MESSAGE_MAP()BOOL CPictureEx::Load(HGLOBAL hGlobal, DWORD dwSize){ IStream *pStream = NULL; UnLoad(); if (!(m_pRawData = reinterpret_cast<unsigned char*> (GlobalLock(hGlobal))) ) {  TRACE(_T("Load: Error locking memory\n"));  return FALSE; }; m_nDataSize = dwSize; m_pGIFHeader = reinterpret_cast<TGIFHeader *> (m_pRawData); if ((memcmp(&m_pGIFHeader->m_cSignature,"GIF",3) != 0) &&  ((memcmp(&m_pGIFHeader->m_cVersion,"87a",3) != 0) ||   (memcmp(&m_pGIFHeader->m_cVersion,"89a",3) != 0)) ) { // it's neither GIF87a nor GIF89a // do the default processing  // clear GIF variables  m_pRawData = NULL;  GlobalUnlock(hGlobal);  // don't delete memory on object's release  if (CreateStreamOnHGlobal(hGlobal,FALSE,&pStream) != S_OK)   return FALSE;  if (OleLoadPicture(pStream,dwSize,FALSE,IID_IPicture,   reinterpret_cast<LPVOID *>(&m_pPicture)) != S_OK)  {   pStream->Release();   return FALSE;  };  pStream->Release();  // store picture's size  long hmWidth;  long hmHeight;  m_pPicture->get_Width(&hmWidth);  m_pPicture->get_Height(&hmHeight);  HDC hDC = ::GetDC(m_hWnd);  m_PictureSize.cx = MulDiv(hmWidth, GetDeviceCaps(hDC,LOGPIXELSX), 2540);  m_PictureSize.cy = MulDiv(hmHeight, GetDeviceCaps(hDC,LOGPIXELSY), 2540);  ::ReleaseDC(m_hWnd,hDC); } else {  // it's a GIF  m_bIsGIF = TRUE;  m_pGIFLSDescriptor = reinterpret_cast<TGIFLSDescriptor *>   (m_pRawData + sizeof(TGIFHeader));  if (m_pGIFLSDescriptor->GetPackedValue(LSD_PACKED_GLOBALCT) == 1)  {   // calculate the globat color table size   m_nGlobalCTSize = static_cast<int>    (3* (1 << (m_pGIFLSDescriptor->GetPackedValue(LSD_PACKED_GLOBALCTSIZE)+1)));   // get the background color if GCT is present   unsigned char *pBkClr = m_pRawData + sizeof(TGIFHeader) +     sizeof(TGIFLSDescriptor) + 3*m_pGIFLSDescriptor->m_cBkIndex;   m_clrBackground = RGB(pBkClr[0],pBkClr[1],pBkClr[2]);  };  // store the picture's size  m_PictureSize.cx = m_pGIFLSDescriptor->m_wWidth;  m_PictureSize.cy = m_pGIFLSDescriptor->m_wHeight;  // determine frame count for this picture  UINT nFrameCount=0;  ResetDataPointer();  while (SkipNextGraphicBlock())   nFrameCount++;#ifdef GIF_TRACING  TRACE(   _T(" -= GIF encountered\n"      "Logical Screen dimensions = %dx%d\n"      "Global color table = %d\n"      "Color depth = %d\n"      "Sort flag = %d\n"      "Size of Global Color Table = %d\n"      "Background color index = %d\n"      "Pixel aspect ratio = %d\n"      "Frame count = %d\n"      "Background color = %06Xh\n\n"     ),   m_pGIFLSDescriptor->m_wWidth,   m_pGIFLSDescriptor->m_wHeight,   m_pGIFLSDescriptor->GetPackedValue(LSD_PACKED_GLOBALCT),   m_pGIFLSDescriptor->GetPackedValue(LSD_PACKED_CRESOLUTION),   m_pGIFLSDescriptor->GetPackedValue(LSD_PACKED_SORT),   m_pGIFLSDescriptor->GetPackedValue(LSD_PACKED_GLOBALCTSIZE),   m_pGIFLSDescriptor->m_cBkIndex,   m_pGIFLSDescriptor->m_cPixelAspect,   nFrameCount,   m_clrBackground   );  EnumGIFBlocks();#endif  if (nFrameCount == 0) // it's an empty GIF!  {   m_pRawData = NULL;   GlobalUnlock(hGlobal);   return FALSE;  };  // now check the frame count  // if there's only one frame, no need to animate this GIF  // therefore, treat it like any other pic  if (nFrameCount == 1)  {   // clear GIF variables   m_pRawData = NULL;   GlobalUnlock(hGlobal);   // don't delete memory on object's release   if (CreateStreamOnHGlobal(hGlobal,FALSE,&pStream) != S_OK)    return FALSE;   if (OleLoadPicture(pStream,dwSize,FALSE,IID_IPicture,    (LPVOID *)&m_pPicture) != S_OK)   {    pStream->Release();    return FALSE;   };   pStream->Release();  }  else  {  // if, on the contrary, there are several frames  // then store separate frames in an array   TFrame frame;   UINT nBlockLen;   HGLOBAL hFrameData;   UINT nCurFrame = 0;   ResetDataPointer();   while (hFrameData = GetNextGraphicBlock(&nBlockLen,    &frame.m_nDelay, &frame.m_frameSize,    &frame.m_frameOffset, &frame.m_nDisposal) )   {    #ifdef GIF_TRACING    //////////////////////////////////////////////    // uncomment the following strings if you want     // to write separate frames on disk    //    // CString szName;    // szName.Format(_T("%.4d.gif"),nCurFrame);    // WriteDataOnDisk(szName,hFrameData,nBlockLen);    // nCurFrame++;    #endif // GIF_TRACING    IStream *pStream = NULL;    // delete memory on object's release    if (CreateStreamOnHGlobal(hFrameData,TRUE,&pStream) != S_OK)    {     GlobalFree(hFrameData);     continue;    };    if (OleLoadPicture(pStream,nBlockLen,FALSE,     IID_IPicture,     reinterpret_cast<LPVOID *>(&frame.m_pPicture)) != S_OK)    {     pStream->Release();     continue;    };    pStream->Release();       // everything went well, add this frame    m_arrFrames.push_back(frame);   };   // clean after ourselves   m_pRawData = NULL;   GlobalUnlock(hGlobal);   if (m_arrFrames.empty()) // couldn't load any frames    return FALSE;  }; }; // if (!IsGIF... return PrepareDC(m_PictureSize.cx,m_PictureSize.cy);}void CPictureEx::UnLoad(){ Stop(); if (m_pPicture) {  m_pPicture->Release();  m_pPicture = NULL; };  std::vector<TFrame>::iterator it; for (it=m_arrFrames.begin();it<m_arrFrames.end();it++)  (*it).m_pPicture->Release(); m_arrFrames.clear(); if (m_hMemDC) {  SelectObject(m_hMemDC,m_hOldBitmap);  ::DeleteDC(m_hMemDC);  ::DeleteObject(m_hBitmap);  m_hMemDC  = NULL;  m_hBitmap = NULL; }; if (m_hDispMemDC) {  SelectObject(m_hDispMemDC,m_hDispOldBM);  ::DeleteDC(m_hDispMemDC);  ::DeleteObject(m_hDispMemBM);  m_hDispMemDC  = NULL;  m_hDispMemBM = NULL; }; SetRect(&m_PaintRect,0,0,0,0); m_pGIFLSDescriptor = NULL; m_pGIFHeader    = NULL; m_pRawData     = NULL; m_hThread     = NULL; m_bIsInitialized   = FALSE; m_bExitThread    = FALSE; m_bIsGIF     = FALSE; m_clrBackground    = RGB(255,255,255); // white by default m_nGlobalCTSize    = 0; m_nCurrOffset    = 0; m_nCurrFrame    = 0; m_nDataSize     = 0;}BOOL CPictureEx::Draw(){ if (!m_bIsInitialized) {  TRACE(_T("Call one of the CPictureEx::Load() member functions before calling Draw()\n"));  return FALSE; }; if (IsAnimatedGIF()) { // the picture needs animation // we'll start the thread that will handle it for us   unsigned int nDummy;  m_hThread = (HANDLE) _beginthreadex(NULL,0,_ThreadAnimation,this,   CREATE_SUSPENDED,&nDummy);  if (!m_hThread)  {   TRACE(_T("Draw: Couldn't start a GIF animation thread\n"));   return FALSE;  }   else    ResumeThread(m_hThread); }  else {  if (m_pPicture)  {   long hmWidth;   long hmHeight;   m_pPicture->get_Width(&hmWidth);   m_pPicture->get_Height(&hmHeight);   if (m_pPicture->Render(m_hMemDC, 0, 0, m_PictureSize.cx, m_PictureSize.cy,     0, hmHeight, hmWidth, -hmHeight, NULL) == S_OK)   {    Invalidate(FALSE);    return TRUE;   };  }; }; return FALSE; }SIZE CPictureEx::GetSize() const{ return m_PictureSize;}BOOL CPictureEx::Load(LPCTSTR szFileName){ ASSERT(szFileName);  CFile file; HGLOBAL hGlobal; DWORD dwSize; if (!file.Open(szFileName,    CFile::modeRead |     CFile::shareDenyWrite) ) {  TRACE(_T("Load (file): Error opening file %s\n"),szFileName);  return FALSE; }; dwSize = file.GetLength(); hGlobal = GlobalAlloc(GMEM_MOVEABLE | GMEM_NODISCARD,dwSize); if (!hGlobal) {  TRACE(_T("Load (file): Error allocating memory\n"));  return FALSE; };  char *pData = reinterpret_cast<char*>(GlobalLock(hGlobal)); if (!pData) {  TRACE(_T("Load (file): Error locking memory\n"));  GlobalFree(hGlobal);  return FALSE; }; TRY {  file.Read(pData,dwSize); } CATCH(CFileException, e);                                           {  TRACE(_T("Load (file): An exception occured while reading the file %s\n"),   szFileName);  GlobalFree(hGlobal);  e->Delete();  file.Close();  return FALSE; } END_CATCH GlobalUnlock(hGlobal); file.Close(); BOOL bRetValue = Load(hGlobal,dwSize); GlobalFree(hGlobal); return bRetValue;}BOOL CPictureEx::Load(LPCTSTR szResourceName, LPCTSTR szResourceType){ ASSERT(szResourceName); ASSERT(szResourceType); HRSRC hPicture = FindResource(AfxGetResourceHandle(),szResourceName,szResourceType); HGLOBAL hResData; if (!hPicture || !(hResData = LoadResource(AfxGetResourceHandle(),hPicture))) {  TRACE(_T("Load (resource): Error loading resource %s\n"),szResourceName);  return FALSE; }; DWORD dwSize = SizeofResource(AfxGetResourceHandle(),hPicture); // hResData is not the real HGLOBAL (we can't lock it) // let's make it real HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE | GMEM_NODISCARD,dwSize); if (!hGlobal) {  TRACE(_T("Load (resource): Error allocating memory\n"));  FreeResource(hResData);  return FALSE; };  char *pDest = reinterpret_cast<char *> (GlobalLock(hGlobal)); char *pSrc = reinterpret_cast<char *> (LockResource(hResData)); if (!pSrc || !pDest) {  TRACE(_T("Load (resource): Error locking memory\n"));  GlobalFree(hGlobal);  FreeResource(hResData);  return FALSE; }; CopyMemory(pDest,pSrc,dwSize); FreeResource(hResData); GlobalUnlock(hGlobal); BOOL bRetValue = Load(hGlobal,dwSize); GlobalFree(hGlobal); return bRetValue;}void CPictureEx::ResetDataPointer(){ // skip header and logical screen descriptor m_nCurrOffset =   sizeof(TGIFHeader)+sizeof(TGIFLSDescriptor)+m_nGlobalCTSize;}BOOL CPictureEx::SkipNextGraphicBlock(){ if (!m_pRawData) return FALSE; // GIF header + LSDescriptor [+ GCT] [+ Control block] + Data enum GIFBlockTypes nBlock; nBlock = GetNextBlock(); while ((nBlock != BLOCK_CONTROLEXT) &&     (nBlock != BLOCK_IMAGE) &&     (nBlock != BLOCK_PLAINTEXT) &&     (nBlock != BLOCK_UNKNOWN) &&     (nBlock != BLOCK_TRAILER) ) {  if (!SkipNextBlock()) return NULL;  nBlock = GetNextBlock(); }; if ((nBlock == BLOCK_UNKNOWN) ||  (nBlock == BLOCK_TRAILER))  return FALSE; // it's either a control ext.block, an image or a plain text if (GetNextBlockLen() <= 0) return FALSE; if (nBlock == BLOCK_CONTROLEXT) {  if (!SkipNextBlock()) return FALSE;  nBlock = GetNextBlock();  // skip everything until we meet an image block or a plain-text block  while ((nBlock != BLOCK_IMAGE) &&      (nBlock != BLOCK_PLAINTEXT) &&      (nBlock != BLOCK_UNKNOWN) &&      (nBlock != BLOCK_TRAILER) )  {   if (!SkipNextBlock()) return NULL;   nBlock = GetNextBlock();  };  if ((nBlock == BLOCK_UNKNOWN) ||   (nBlock == BLOCK_TRAILER))   return FALSE; }; // skip the found data block (image or plain-text) if (!SkipNextBlock()) return FALSE; return TRUE;}UINT CPictureEx::GetSubBlocksLen(UINT nStartingOffset) const{ UINT nRet = 0; UINT nCurOffset = nStartingOffset;  while (m_pRawData[nCurOffset] != 0) {  nRet += m_pRawData[nCurOffset]+1;  nCurOffset += m_pRawData[nCurOffset]+1; }; return nRet+1;}enum CPictureEx::GIFBlockTypes CPictureEx::GetNextBlock() const{ switch(m_pRawData[m_nCurrOffset]) { case 0x21: // extension block  switch(m_pRawData[m_nCurrOffset+1])  {  case 0x01:  // plain text extension   return BLOCK_PLAINTEXT;   break;  case 0xF9:  // graphic control extension   return BLOCK_CONTROLEXT;   break;  case 0xFE:  // comment extension   return BLOCK_COMMEXT;   break;  case 0xFF:  // application extension   return BLOCK_APPEXT;   break;  };  break;  case 0x3B: // trailer  return BLOCK_TRAILER;  break; case 0x2C: // image data  return BLOCK_IMAGE;  break; }; return BLOCK_UNKNOWN;}BOOL CPictureEx::SkipNextBlock(){ if (!m_pRawData) return FALSE; int nLen = GetNextBlockLen(); if ((nLen <= 0) || ((m_nCurrOffset+nLen) > m_nDataSize))  return FALSE; m_nCurrOffset += nLen; return TRUE;}int CPictureEx::GetNextBlockLen() const{ GIFBlockTypes nBlock = GetNextBlock(); int nTmp; switch(nBlock) { case BLOCK_UNKNOWN:  return -1;  break; case BLOCK_TRAILER:  return 1;  break; case BLOCK_APPEXT:  nTmp = GetSubBlocksLen(m_nCurrOffset+sizeof(TGIFAppExtension));  if (nTmp > 0)   return sizeof(TGIFAppExtension)+nTmp;  break; case BLOCK_COMMEXT:  nTmp = GetSubBlocksLen(m_nCurrOffset+sizeof(TGIFCommentExt));  if (nTmp > 0)   return sizeof(TGIFCommentExt)+nTmp;  break; case BLOCK_CONTROLEXT:  return sizeof(TGIFControlExt);  break; case BLOCK_PLAINTEXT:  nTmp = GetSubBlocksLen(m_nCurrOffset+sizeof(TGIFPlainTextExt));  if (nTmp > 0)   return sizeof(TGIFPlainTextExt)+nTmp;  break; case BLOCK_IMAGE:  TGIFImageDescriptor *pIDescr =    reinterpret_cast<TGIFImageDescriptor *> (&m_pRawData[m_nCurrOffset]);  int nLCTSize = (int)   (pIDescr->GetPackedValue(ID_PACKED_LOCALCT)*3*   (1 << (pIDescr->GetPackedValue(ID_PACKED_LOCALCTSIZE)+1)));  int nTmp = GetSubBlocksLen(m_nCurrOffset+   sizeof(TGIFImageDescriptor) + nLCTSize + 1);  if (nTmp > 0)   return sizeof(TGIFImageDescriptor) + nLCTSize + 1 + nTmp;  break; }; return 0;}UINT WINAPI CPictureEx::_ThreadAnimation(LPVOID pParam){ ASSERT(pParam); CPictureEx *pPic = reinterpret_cast<CPictureEx *> (pParam); pPic->m_bIsPlaying = TRUE; pPic->ThreadAnimation(); pPic->m_bIsPlaying = FALSE; // this thread has finished its work so we close the handle CloseHandle(pPic->m_hThread);  // and init the handle to zero (so that Stop() doesn't Wait on it) pPic->m_hThread = 0; return 0;}void CPictureEx::ThreadAnimation(){ // first, restore background (for stop/draw support) // disposal method #2 if (m_arrFrames[m_nCurrFrame].m_nDisposal == 2) {  HBRUSH hBrush = CreateSolidBrush(m_clrBackground);  if (hBrush)  {   RECT rect = {    m_arrFrames[m_nCurrFrame].m_frameOffset.cx,    m_arrFrames[m_nCurrFrame].m_frameOffset.cy,    m_arrFrames[m_nCurrFrame].m_frameOffset.cx + m_arrFrames[m_nCurrFrame].m_frameSize.cx,    m_arrFrames[m_nCurrFrame].m_frameOffset.cy + m_arrFrames[m_nCurrFrame].m_frameSize.cy };   FillRect(m_hMemDC,&rect,hBrush);   DeleteObject(hBrush);  }; }  else  // disposal method #3  if (m_hDispMemDC && (m_arrFrames[m_nCurrFrame].m_nDisposal == 3) )  {   // put it back   BitBlt(m_hMemDC,    m_arrFrames[m_nCurrFrame].m_frameOffset.cx,    m_arrFrames[m_nCurrFrame].m_frameOffset.cy,    m_arrFrames[m_nCurrFrame].m_frameSize.cx,    m_arrFrames[m_nCurrFrame].m_frameSize.cy,    m_hDispMemDC,0,0, SRCCOPY);   // init variables   SelectObject(m_hDispMemDC,m_hDispOldBM);   DeleteDC(m_hDispMemDC); m_hDispMemDC = NULL;   DeleteObject(m_hDispMemBM); m_hDispMemBM = NULL;  }; while (!m_bExitThread) {  if (m_arrFrames[m_nCurrFrame].m_pPicture)  {  ///////////////////////////////////////////////////////  // Before rendering a frame we should take care of what's   // behind that frame. TFrame::m_nDisposal will be our guide:  //   0 - no disposal specified (do nothing)  //   1 - do not dispose (again, do nothing)  //   2 - restore to background color (m_clrBackground)  //   3 - restore to previous   //////// disposal method #3   if (m_arrFrames[m_nCurrFrame].m_nDisposal == 3)   {    // prepare a memory DC and store the background in it    m_hDispMemDC = CreateCompatibleDC(m_hMemDC);    m_hDispMemBM = CreateCompatibleBitmap(m_hMemDC,       m_arrFrames[m_nCurrFrame].m_frameSize.cx,       m_arrFrames[m_nCurrFrame].m_frameSize.cy);        if (m_hDispMemDC && m_hDispMemBM)    {     m_hDispOldBM = reinterpret_cast<HBITMAP> (SelectObject(m_hDispMemDC,m_hDispMemBM));     BitBlt(m_hDispMemDC,0,0,      m_arrFrames[m_nCurrFrame].m_frameSize.cx,      m_arrFrames[m_nCurrFrame].m_frameSize.cy,      m_hMemDC,      m_arrFrames[m_nCurrFrame].m_frameOffset.cx,      m_arrFrames[m_nCurrFrame].m_frameOffset.cy,      SRCCOPY);    };   };   ///////////////////////   long hmWidth;   long hmHeight;   m_arrFrames[m_nCurrFrame].m_pPicture->get_Width(&hmWidth);   m_arrFrames[m_nCurrFrame].m_pPicture->get_Height(&hmHeight);   if (m_arrFrames[m_nCurrFrame].m_pPicture->Render(m_hMemDC,     m_arrFrames[m_nCurrFrame].m_frameOffset.cx,     m_arrFrames[m_nCurrFrame].m_frameOffset.cy,     m_arrFrames[m_nCurrFrame].m_frameSize.cx,     m_arrFrames[m_nCurrFrame].m_frameSize.cy,     0, hmHeight, hmWidth, -hmHeight, NULL) == S_OK)   {    Invalidate(FALSE);   };      if (m_bExitThread) break;   // if the delay time is too short (like in old GIFs), wait for 100ms   if (m_arrFrames[m_nCurrFrame].m_nDelay < 5)     WaitForSingleObject(m_hExitEvent, 100);   else    WaitForSingleObject(m_hExitEvent, 10*m_arrFrames[m_nCurrFrame].m_nDelay);   if (m_bExitThread) break;   // disposal method #2   if (m_arrFrames[m_nCurrFrame].m_nDisposal == 2)   {    HBRUSH hBrush = CreateSolidBrush(m_clrBackground);    if (hBrush)    {     RECT rect = {      m_arrFrames[m_nCurrFrame].m_frameOffset.cx,      m_arrFrames[m_nCurrFrame].m_frameOffset.cy,      m_arrFrames[m_nCurrFrame].m_frameOffset.cx + m_arrFrames[m_nCurrFrame].m_frameSize.cx,      m_arrFrames[m_nCurrFrame].m_frameOffset.cy + m_arrFrames[m_nCurrFrame].m_frameSize.cy };     FillRect(m_hMemDC,&rect,hBrush);     DeleteObject(hBrush);    };   }    else    if (m_hDispMemDC && (m_arrFrames[m_nCurrFrame].m_nDisposal == 3) )    {     // put it back     BitBlt(m_hMemDC,      m_arrFrames[m_nCurrFrame].m_frameOffset.cx,      m_arrFrames[m_nCurrFrame].m_frameOffset.cy,      m_arrFrames[m_nCurrFrame].m_frameSize.cx,      m_arrFrames[m_nCurrFrame].m_frameSize.cy,      m_hDispMemDC,0,0, SRCCOPY);     // init variables     SelectObject(m_hDispMemDC,m_hDispOldBM);     DeleteDC(m_hDispMemDC); m_hDispMemDC = NULL;     DeleteObject(m_hDispMemBM); m_hDispMemBM = NULL;    };  };  m_nCurrFrame++;  if (m_nCurrFrame == m_arrFrames.size())  {   m_nCurrFrame    = 0;   // init the screen for the first frame,   HBRUSH hBrush = CreateSolidBrush(m_clrBackground);   if (hBrush)   {    RECT rect = {0,0,m_PictureSize.cx,m_PictureSize.cy};    FillRect(m_hMemDC,&rect,hBrush);    DeleteObject(hBrush);   };  }; };}void CPictureEx::Stop(){ m_bIsPlaying = FALSE; m_bExitThread = TRUE; SetEvent(m_hExitEvent); if (m_hThread) {  // we'll wait for 5 seconds then continue execution  WaitForSingleObject(m_hThread,5000);  CloseHandle(m_hThread);  m_hThread = NULL; } // make it possible to Draw() again ResetEvent(m_hExitEvent); m_bExitThread = FALSE;}HGLOBAL CPictureEx::GetNextGraphicBlock(UINT *pBlockLen,  UINT *pDelay, SIZE *pBlockSize, SIZE *pBlockOffset,  UINT *pDisposal){ if (!m_pRawData) return NULL; // GIF header + LSDescriptor [+ GCT] [+ Control block] + Data *pDisposal = 0; enum GIFBlockTypes nBlock; nBlock = GetNextBlock(); while (  (nBlock != BLOCK_CONTROLEXT) &&  (nBlock != BLOCK_IMAGE) &&  (nBlock != BLOCK_PLAINTEXT) &&  (nBlock != BLOCK_UNKNOWN) &&  (nBlock != BLOCK_TRAILER)  ) {  if (!SkipNextBlock()) return NULL;  nBlock = GetNextBlock(); }; if ((nBlock == BLOCK_UNKNOWN) ||  (nBlock == BLOCK_TRAILER))  return NULL; // it's either a control ext.block, an image or a plain text int nStart = m_nCurrOffset; int nBlockLen = GetNextBlockLen(); if (nBlockLen <= 0) return NULL; if (nBlock == BLOCK_CONTROLEXT) {  // get the following data  TGIFControlExt *pControl =    reinterpret_cast<TGIFControlExt *> (&m_pRawData[m_nCurrOffset]);  // store delay time  *pDelay = pControl->m_wDelayTime;  // store disposal method  *pDisposal = pControl->GetPackedValue(GCX_PACKED_DISPOSAL);  if (!SkipNextBlock()) return NULL;  nBlock = GetNextBlock();    // skip everything until we find data to display   // (image block or plain-text block)    while (   (nBlock != BLOCK_IMAGE) &&   (nBlock != BLOCK_PLAINTEXT) &&   (nBlock != BLOCK_UNKNOWN) &&   (nBlock != BLOCK_TRAILER)   )  {   if (!SkipNextBlock()) return NULL;   nBlock = GetNextBlock();   nBlockLen += GetNextBlockLen();  };  if ((nBlock == BLOCK_UNKNOWN) || (nBlock == BLOCK_TRAILER))   return NULL;  nBlockLen += GetNextBlockLen(); } else  *pDelay = -1; // to indicate that there was no delay value if (nBlock == BLOCK_IMAGE) {  // store size and offsets  TGIFImageDescriptor *pImage =    reinterpret_cast<TGIFImageDescriptor *> (&m_pRawData[m_nCurrOffset]);  pBlockSize->cx = pImage->m_wWidth;  pBlockSize->cy = pImage->m_wHeight;  pBlockOffset->cx = pImage->m_wLeftPos;  pBlockOffset->cy = pImage->m_wTopPos; }; if (!SkipNextBlock()) return NULL; HGLOBAL hGlobal = GlobalAlloc(GMEM_FIXED,  sizeof(TGIFHeader) +  sizeof(TGIFLSDescriptor) +  m_nGlobalCTSize +  nBlockLen +   1);  // for the trailer if (!hGlobal) return NULL; int nOffset = 0; // GMEM_FIXED means we get a pointer unsigned char *pGlobal = reinterpret_cast<unsigned char *> (hGlobal); CopyMemory(pGlobal,m_pRawData,   sizeof(TGIFHeader)+sizeof(TGIFLSDescriptor)+m_nGlobalCTSize); nOffset += sizeof(TGIFHeader)+sizeof(TGIFLSDescriptor)+m_nGlobalCTSize; CopyMemory(pGlobal + nOffset,&m_pRawData[nStart], nBlockLen); nOffset += nBlockLen; pGlobal[nOffset] = 0x3B; // trailer nOffset++; *pBlockLen = nOffset; return hGlobal;}BOOL CPictureEx::IsGIF() const{ return m_bIsGIF;}BOOL CPictureEx::IsAnimatedGIF() const{ return (m_bIsGIF && (m_arrFrames.size() > 1));}BOOL CPictureEx::IsPlaying() const{ return m_bIsPlaying;}int CPictureEx::GetFrameCount() const{ if (!IsAnimatedGIF())  return 0; return m_arrFrames.size();}COLORREF CPictureEx::GetBkColor() const{ return m_clrBackground;}void CPictureEx::OnPaint() { CPaintDC dc(this); // device context for painting LONG nPaintWidth = m_PaintRect.right-m_PaintRect.left; if (nPaintWidth > 0) {  LONG nPaintHeight = m_PaintRect.bottom - m_PaintRect.top;  ::BitBlt(dc.m_hDC, 0, 0, nPaintWidth, nPaintHeight,    m_hMemDC, m_PaintRect.left, m_PaintRect.top, SRCCOPY); } else {  ::BitBlt(dc.m_hDC, 0, 0, m_PictureSize.cx, m_PictureSize.cy,   m_hMemDC, 0, 0, SRCCOPY); };}BOOL CPictureEx::PrepareDC(int nWidth, int nHeight){ SetWindowPos(NULL,0,0,nWidth,nHeight,SWP_NOMOVE | SWP_NOZORDER); HDC hWinDC = ::GetDC(m_hWnd); if (!hWinDC) return FALSE;  m_hMemDC = CreateCompatibleDC(hWinDC); if (!m_hMemDC)  {  ::ReleaseDC(m_hWnd,hWinDC);  return FALSE; }; m_hBitmap  = CreateCompatibleBitmap(hWinDC,nWidth,nHeight); if (!m_hBitmap)  {  ::ReleaseDC(m_hWnd,hWinDC);  ::DeleteDC(m_hMemDC);  return FALSE; }; m_hOldBitmap = reinterpret_cast<HBITMAP>       (SelectObject(m_hMemDC,m_hBitmap));  // fill the background m_clrBackground = GetSysColor(COLOR_3DFACE); RECT rect = {0,0,nWidth,nHeight}; FillRect(m_hMemDC,&rect,(HBRUSH)(COLOR_WINDOW)); ::ReleaseDC(m_hWnd,hWinDC); m_bIsInitialized = TRUE; return TRUE;}void CPictureEx::OnDestroy() { Stop();  CStatic::OnDestroy();}void CPictureEx::SetBkColor(COLORREF clr){ if (!m_bIsInitialized) return; m_clrBackground = clr; HBRUSH hBrush = CreateSolidBrush(clr); if (hBrush) {  RECT rect = {0,0,m_PictureSize.cx,m_PictureSize.cy};  FillRect(m_hMemDC,&rect,hBrush);  DeleteObject(hBrush); };}#ifdef GIF_TRACINGvoid CPictureEx::WriteDataOnDisk(CString szFileName, HGLOBAL hData, DWORD dwSize){ CFile file; if (!file.Open(szFileName,   CFile::modeCreate |   CFile::modeWrite |   CFile::shareDenyNone)) {  TRACE(_T("WriteData: Error creating file %s\n"),szFileName);  return; }; char *pData = reinterpret_cast<char *> (GlobalLock(hData)); if (!pData) {  TRACE(_T("WriteData: Error locking memory\n"));  return; }; TRY {  file.Write(pData,dwSize); } CATCH(CFileException, e);                                           {  TRACE(_T("WriteData: An exception occured while writing to the file %s\n"),   szFileName);  e->Delete();  GlobalUnlock(hData);  file.Close();  return; } END_CATCH  GlobalUnlock(hData); file.Close();}void CPictureEx::EnumGIFBlocks(){ enum GIFBlockTypes nBlock; ResetDataPointer(); while(m_nCurrOffset < m_nDataSize) {  nBlock = GetNextBlock();  switch(nBlock)  {  case BLOCK_UNKNOWN:   TRACE(_T("- Unknown block\n"));   return;   break;  case BLOCK_TRAILER:   TRACE(_T("- Trailer block\n"));   break;  case BLOCK_APPEXT:   TRACE(_T("- Application extension block\n"));   break;  case BLOCK_COMMEXT:   TRACE(_T("- Comment extension block\n"));   break;  case BLOCK_CONTROLEXT:   {   TGIFControlExt *pControl =     reinterpret_cast<TGIFControlExt *> (&m_pRawData[m_nCurrOffset]);   TRACE(_T("- Graphic control extension block (delay %d, disposal %d)\n"),     pControl->m_wDelayTime, pControl->GetPackedValue(GCX_PACKED_DISPOSAL));   };   break;  case BLOCK_PLAINTEXT:   TRACE(_T("- Plain text extension block\n"));   break;  case BLOCK_IMAGE:   TGIFImageDescriptor *pIDescr =     reinterpret_cast<TGIFImageDescriptor *> (&m_pRawData[m_nCurrOffset]);   TRACE(_T("- Image data block (%dx%d  %d,%d)\n"),     pIDescr->m_wWidth,     pIDescr->m_wHeight,     pIDescr->m_wLeftPos,     pIDescr->m_wTopPos);   break;  };  SkipNextBlock();  }; TRACE(_T("\n"));}#endif // GIF_TRACINGBOOL CPictureEx::SetPaintRect(const RECT *lpRect){ return CopyRect(&m_PaintRect, lpRect);}BOOL CPictureEx::GetPaintRect(RECT *lpRect){ return CopyRect(lpRect, &m_PaintRect);}

示例程序下载后用WINZIP选择use folder解压，其中PictureEx.h，PictureEx.cpp两个文件为类文件
　　    PictureEx图片显示类支持以下格式的图片：GIF (including animated GIF87a and GIF89a), JPEG, BMP, WMF, ICO, CUR等，我特别推崇的是可以做出动画，而且轻而易举，确实很COOL。
　　下面是详细的编程过程：
　　1. 新建项目：在VC6中用MFC新建一个基于对话框的GifDemo应用程序，接受所有缺省选项即可；
　　2.在项目中插入文件：把PictureEx.h，PictureEx.cpp文件copy 到项目文件夹下，Project->Add to Project->Files中选上PictureEx.h，PictureEx.cpp， Insert;
　　3.加入图片控件：从对话框控件中把Picture Control（图片控件)拖入主对话框中，修改其属性：ID：IDC_GIF，TYPE：Rectangle，其余接受缺省选项。再在ClassWiard中为IDF_GIF加入CSatic控制变量m_GifPic, 注意看一下，GifDemoDlg.h中是否加上了#include "PictureEx.h"（由ClassWiard加入）。然后将CSatic m_GifPic;更改成CPictureEx m_GifPic;
　　4.加载动画文件：先将要加载的动画文件放到 res 资源文件夹下，再将其Import进项目中，由于MFC只支持256BMP文件的图片，因此，我们要新建一个图片类型："GIF",我在这里将我网站的宣传图片roaring.gif放进去 （希望大家多支持），并将其ID修改成：IDR_GIFROARING。
　　____________________________________
　　import(导入）gif动画的详细过程：
　　在resourceview窗口中，单击鼠标右键，在出现的环境菜单中选择“import...”命令，会出现“import resource”选择文件对话框，文件类型选择“所有文件（*.*）”，open as 选项为"auto",再选择动画文件所在目录，选上要载入的动画文件 roaring.gif,再单击 import,由于gif动画类型不是vc默认的文件类型，这时会出现"custom resource type"对话框，键入“"gif"”，再单击ok，然后再修改其id。
　　________________________________________________________________
　　5.在程序的适当位置添入加载代码： 这里，我们在CGifDemoDlg::OnInitDialog()函数中加入如下代码：
　　// TODO: Add extra initialization here
　　if (m_GifPic.Load(MAKEINTRESOURCE(IDR_GIFROARING),_T("Gif")))
　　m_GifPic.Draw();
　　如果仅仅把动画载入，到这就可以了，运行一下，应该看看您的的成果了。
　　下面附带说说如何将这幅动画制作成超链接，以后，咱们也可以宣传自已的公司、网站或产品了。
　　6.利用ClassWiard加入一个LButtonDown鼠标左键消息处理函数CGifDemoDlg::OnLButtonDown(UINT nFlags, CPoint point)， 添入如下代码：
　　void CGifDemoDlg::OnLButtonDown(UINT nFlags, CPoint point) 
　　{
　　// TODO: Add your message handler code here and/or call default
　　CRect rect;
　　m_GifPic.GetWindowRect(&rect);
　　ScreenToClient(&rect);
　　if (rect.PtInRect(point))
　　ShellExecute(AfxGetMainWnd()->m_hWnd,_T("open"),
　　_T("http://roaringwind.best.163.com"),_T(""),NULL,0);
　　CDialog::OnLButtonDown(nFlags, point);
　　}

我在这儿将我主页的地址放上了，运行，点击动画图片就能进入我的站点的了。当然要是能象所有的超链接一样，能将鼠标变成手形，就更好了。
　　7.改变鼠标形状：将一个鼠标文件放在res文件夹中，IMPORT，ID：IDC_CURSOR1，利用ClassWiard加入一个WM_SETCURSOR消息处理函数CGifDemoDlg::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)， 添入如下代码：
　　BOOL CGifDemoDlg::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) 
　　{
　　// TODO: Add your message handler code here and/or call default
　　CRect rect;
　　m_GifPic.GetWindowRect(&rect);
　　ScreenToClient(&rect);
　　CPoint point;
　　GetCursorPos(&point);
　　ScreenToClient(&point);
　　if (rect.PtInRect(point) && m_hCursor)
　　{
　　SetCursor(m_hCursor);
　　return TRUE;
　　};
　　return CDialog::OnSetCursor(pWnd, nHitTest, message);
　　}
　　不错吧。
　　大家看到了什么好东西，别忘记了告诉我，谢谢。