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在VC中加载GIF动画

提供者：qiaoyongbo 张贴时间：2007-12-20 15:36:17.0 出处：vchelp.net 作者：Oleg

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在VC中加载GIF动画

有一个CPictureEx类，用于加载GIF动画，不过该类是mfc封装类，对于不使用mfc的c++程序员来讲，不能使用。为了让该类能够让更多的人方便的使用，使其不再被局限于MFC，本人花时间改造了一下这个类，改造后，该类可以应用于任何MFC、 WTL/ATL及其它WINDOWS API编程。

由于原来的CPictureEx是继承于CStatic类，本人改造后，在CPictureEx中直接封装了一个窗口句柄HWND。

假设您在一个弹出式Dialog对话框中加载gif动画，您要做的就是在对话框中放一个控件，可以是BUTTON、STATIC等等。假设您加的这个控件的ID是IDC_FLASH，您的对话框窗口句柄是hDlg，则要使用CPictureEx，将非常简单。详情参见源代码。

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，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。

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); creenToClient(&rect); if (rect.PtInRect(point)) hellExecute(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); creenToClient(&rect); CPoint point; GetCursorPos(&point); creenToClient(&point); if (rect.PtInRect(point) && m_hCursor) { etCursor(m_hCursor); return TRUE; }; return CDialog::OnSetCursor(pWnd, nHitTest, message); }

呵呵完成了试一下吧！！

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re:在VC中加载GIF动画

... 收到，谢谢lz

ecbian 于 2007-12-21 17:31:47.0 编辑 [回复该贴]

re:在VC中加载GIF动画

...lz能否share下你写的CPictureEx类呀？谢谢

ecbian 于 2007-12-20 19:37:35.0 编辑 [回复该贴]

re:re:在VC中加载GIF动画

...h #if !defined(CPICTUREEX__INCLUDED_) #define CPICTUREEX__INCLUDED_ #include "ocidl.h" #include <vector> #include <process.h> #include "assert.h" #include "Winbase.h" #include "olectl.h" class CPictureEx { public: class WndProcThunk { public: #pragma pack(push,1) struct _WndProcThunk { DWORD m_mov; DWORD m_this; BYTE m_jmp; DWORD m_relproc; }; #pragma pack(pop) _WndProcThunk thunk; void Init(WNDPROC proc, void* pThis) { thunk.m_mov = 0x042444C7; thunk.m_this = (DWORD)pThis; thunk.m_jmp = 0xe9; thunk.m_relproc = (int)proc - ((int)this+sizeof(_WndProcThunk)); ::FlushInstructionCache(GetCurrentProcess(), &thunk, sizeof(thunk)); } }; 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 on enum 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 off public: //add by Jason HWND m_hWnd; WndProcThunk m_thunk; ////////////////////////////////////////////////////////////////////////// BOOL GetPaintRect(RECT* lpRect); BOOL SetPaintRect(const RECT* lpRect); CPictureEx(HWND hWnd); 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(HINSTANCE hinst,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 unsigned __stdcall _ThreadAnimation(LPVOID pParam); //add by jason//////////////////////////////////////////////////////////// static LRESULT CALLBACK WindowProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam ); static WNDPROC m_pOldWindowProc; ////////////////////////////////////////////////////////////////////////// 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); //add by jason void OnDestroy(); void OnPaint(); ////////////////////////////////////////////////////////////////////////// }; #endif ......cpp #include "stdafx.h" #include "PictureEx.h" #define szShareDumpData "HTMLManager" void dbgPrintf(const TCHAR* fmt, ...) { va_list marker; TCHAR szBuf[1024]; va_start(marker, fmt); wvsprintf(szBuf, fmt, marker); va_end(marker); HANDLE hMap = OpenFileMapping( FILE_MAP_ALL_ACCESS,FALSE, szShareDumpData ); LPSTR pString = (LPSTR)MapViewOfFile(hMap,FILE_MAP_READ|FILE_MAP_WRITE,0,0,0); if(pString && strlen(szBuf) ) { lstrcpy( pString, szBuf ); UnmapViewOfFile((LPCVOID)pString); } CloseHandle(hMap); Sleep(100); } LRESULT CALLBACK CPictureEx::WindowProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam ) { CPictureEx * pMyThis = (CPictureEx *)hwnd; switch(uMsg) { case WM_PAINT: pMyThis->OnPaint(); return DefWindowProc(pMyThis->m_hWnd,uMsg,wParam,lParam); case WM_DESTROY: pMyThis->OnDestroy(); return DefWindowProc(pMyThis->m_hWnd,uMsg,wParam,lParam); } return CallWindowProc(m_pOldWindowProc,pMyThis->m_hWnd,uMsg,wParam,lParam); } WNDPROC CPictureEx::m_pOldWindowProc = NULL; ////////////////////////////////////////////////////////////////////// // 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(HWND hWnd) :m_hWnd(hWnd) { // 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); m_thunk.Init(WindowProc, this); WNDPROC pProc = (WNDPROC)&(m_thunk.thunk); CPictureEx::m_pOldWindowProc = (WNDPROC)::SetWindowLong(hWnd, GWL_WNDPROC, (LONG)pProc); dbgPrintf("CPictureEx(HWND hWnd = %x\n)",m_hWnd); } CPictureEx::~CPictureEx() { dbgPrintf("~CPictureEx()\n"); UnLoad(); CloseHandle(m_hExitEvent); } BOOL CPictureEx::Load(HGLOBAL hGlobal, DWORD dwSize) { dbgPrintf("Load(HGLOBAL hGlobal, DWORD dwSize)\n"); IStream* pStream = NULL; UnLoad(); if(!(m_pRawData = reinterpret_cast<unsigned char*>(GlobalLock(hGlobal)))) { OutputDebugString(_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 OutputDebugString(_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); } BOOL CPictureEx::Load(HINSTANCE hinst,LPCTSTR szResourceName, LPCTSTR szResourceType) { assert(szResourceName); assert(szResourceType); HRSRC hPicture = FindResource(hinst,szResourceName,szResourceType); HGLOBAL hResData; if (!hPicture || !(hResData = LoadResource(hinst,hPicture))) { dbgPrintf(_T("Load (resource): Error loading resource %s\n"),szResourceName); return FALSE; }; DWORD dwSize = SizeofResource(hinst,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) { dbgPrintf("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) { dbgPrintf(_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::UnLoad() { dbgPrintf("CPictureEx::UnLoad()\n"); 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) { OutputDebugString(_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, (void *)this, CREATE_SUSPENDED, &nDummy); if(!m_hThread) { OutputDebugString(_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) { InvalidateRect(m_hWnd,NULL,FALSE); return TRUE; }; }; }; return FALSE; } SIZE CPictureEx::GetSize() const { return m_PictureSize; } BOOL CPictureEx::Load(LPCTSTR szFileName) { assert(szFileName); FILE * file; HGLOBAL hGlobal; DWORD dwSize; file = _tfopen(szFileName, _T("rb")); if(!file) { OutputDebugString(_T("Load (file): Error opening file\n")); return FALSE; }; fseek(file,0,SEEK_END); dwSize = ftell(file); fseek(file,0,SEEK_SET); hGlobal = GlobalAlloc(GMEM_MOVEABLE | GMEM_NODISCARD, dwSize); if(!hGlobal) { OutputDebugString(_T("Load (file): Error allocating memory\n")); return FALSE; }; char* pData = reinterpret_cast<char*>(GlobalLock(hGlobal)); if(!pData) { OutputDebugString(_T("Load (file): Error locking memory\n")); GlobalFree(hGlobal); return FALSE; }; if (fread(pData,1,dwSize,file) != dwSize) { dbgPrintf(_T("Load (file): Error reading the file %s\n"), szFileName); GlobalFree(hGlobal); fclose(file); return FALSE; }; GlobalUnlock(hGlobal); fclose(file); 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 __stdcall 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) { InvalidateRect(m_hWnd,NULL,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() { dbgPrintf("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() { HDC m_hDC = GetDC(m_hWnd); LONG nPaintWidth = m_PaintRect.right - m_PaintRect.left; if(nPaintWidth > 0) { LONG nPaintHeight = m_PaintRect.bottom - m_PaintRect.top; ::BitBlt(m_hDC, 0, 0, nPaintWidth, nPaintHeight, m_hMemDC, m_PaintRect.left, m_PaintRect.top, SRCCOPY); } else ::BitBlt(m_hDC, 0, 0, m_PictureSize.cx, m_PictureSize.cy, m_hMemDC, 0, 0, SRCCOPY);; ReleaseDC(m_hWnd,m_hDC); } BOOL CPictureEx::PrepareDC(int nWidth, int nHeight) { ::SetWindowPos(m_hWnd,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(); } 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_TRACING void CPictureEx::WriteDataOnDisk(CString szFileName, HGLOBAL hData, DWORD dwSize) { CFile file; if(!file.Open(szFileName, CFile::modeCreate | CFile::modeWrite | CFile::shareDenyNone)) { OutputDebugString(_T("WriteData: Error creating file %s\n"), szFileName); return; }; char* pData = reinterpret_cast<char*>(GlobalLock(hData)); if(!pData) { OutputDebugString(_T("WriteData: Error locking memory\n")); return; }; TRY { file.Write(pData, dwSize); } CATCH(CFileException, e); { OutputDebugString(_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: OutputDebugString(_T("- Unknown block\n")); return; break; case BLOCK_TRAILER: OutputDebugString(_T("- Trailer block\n")); break; case BLOCK_APPEXT: OutputDebugString(_T("- Application extension block\n")); break; case BLOCK_COMMEXT: OutputDebugString(_T("- Comment extension block\n")); break; case BLOCK_CONTROLEXT: { TGIFControlExt* pControl = reinterpret_cast<TGIFControlExt*>(&m_pRawData[m_nCurrOffset]); OutputDebugString(_T("- Graphic control extension block (delay %d, disposal %d)\n"), pControl->m_wDelayTime, pControl->GetPackedValue(GCX_PACKED_DISPOSAL)); }; break; case BLOCK_PLAINTEXT: OutputDebugString(_T("- Plain text extension block\n")); break; case BLOCK_IMAGE: TGIFImageDescriptor* pIDescr = reinterpret_cast<TGIFImageDescriptor*>(&m_pRawData[m_nCurrOffset]); OutputDebugString(_T("- Image data block (%dx%d %d,%d)\n"), pIDescr->m_wWidth, pIDescr->m_wHeight, pIDescr->m_wLeftPos, pIDescr->m_wTopPos); break; }; SkipNextBlock(); }; OutputDebugString(_T("\n")); } #endif // GIF_TRACING BOOL CPictureEx::SetPaintRect(const RECT* lpRect) { return CopyRect(&m_PaintRect, lpRect); } BOOL CPictureEx::GetPaintRect(RECT* lpRect) { return CopyRect(lpRect, &m_PaintRect); }

qiaoyongbo 于 2007-12-21 14:56:00.0 编辑 [回复该贴]