win32显示gif图片

最近在写win32的发送图片程序,由于要求适配gif格式,不得不强迫自己写了这么一个程序,主要参考了VC++ win32 sdk 显示 gif 图片,不过里面的每一帧的显示时间时间设成了固定值,我在代码中写了一个函数获取gif的间隔时间进行了修改

我把函数写到了一个cpp和一个h文件中,大家使用的时候调用OpenGifThread函数就可了

ShowGif.h的内容

#include <windows.h>  #include <ocidl.h>  #include <olectl.h>  #include <vector>  #include <math.h>  #include <process.h>  #include <gdiplus.h>using namespace Gdiplus;#pragma comment(lib,"GdiPlus.lib")typedef struct gifImage{WORD logX;WORD logY;WORD width;WORD height;struct flag{BYTE d : 3;BYTE c : 1;BYTE b : 3;BYTE a : 1;}Flag;}GifImage, *PGifImage;struct ArgInfo{HWND       hwnd;LPCTSTR   szImagePath;};aUINT WINAPI DrawGif(LPVOID pParam);UINT OpenGifThread(HWND hWnd, LPCTSTR szImagePath);int GetFramePause(const ArgInfo* arg);bool IsGif(LPCTSTR szImagePath);void GetGifFrame(void *pImageMemory, BYTE* lpBy, BYTE** pByte, DWORD * nu, DWORD& dwReadedSize, int& num, DWORD& firstLocation);void ShowFrame(HWND& hWnd, HGLOBAL& hImageMemory, BYTE* lpBy, BYTE** pByte, DWORD * nu, DWORD& dwReadedSize, int& num, DWORD& firstLocation, int& lPause);

ShowGif.cpp的内容

#include "ShowGif"HANDLE m_hThread = 0;ArgInfo Info;const int MaxFrameNumber = 1000;UINT WINAPI DrawGif(LPVOID pParam){ArgInfo* arg = (ArgInfo*)pParam;HWND hWnd = arg->hwnd;LPCTSTR szImagePath = arg->szImagePath;//从指定的路径szImagePath中读取文件句柄  HANDLE hFile = CreateFile(szImagePath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);//获得图片文件的大小，用来分配全局内存  DWORD dwFileSize = GetFileSize(hFile, NULL);//给图片分配全局内存  HGLOBAL hImageMemory = GlobalAlloc(GMEM_MOVEABLE, dwFileSize);void *pImageMemory = GlobalLock(hImageMemory); //锁定内存  DWORD dwReadedSize; //保存实际读取的文件大小  ReadFile(hFile, pImageMemory, dwFileSize, &dwReadedSize, NULL); //读取图片到全局内存当中  GlobalUnlock(hImageMemory); //解锁内存  CloseHandle(hFile); //关闭文件句柄  BYTE* lpBy = (BYTE*)pImageMemory;   //获得图象的首地址  BYTE* pByte[10000];                    //用来储存gif每幅图象的地址  DWORD nu[10000];                   //用来储存每幅图象的大小 int num = 0;                    //用来计算有几副图象  DWORD firstLocation = 0;        //第一副图象的位置，用来替换 /*将gif分割为多个图片*/GetGifFrame(pImageMemory, lpBy, pByte, nu, dwReadedSize, num, firstLocation);/*获取gif的帧的时间*/int lPause = GetFramePause(arg);/*显示图片*/ShowFrame(hWnd, hImageMemory, lpBy, pByte, nu, dwReadedSize, num, firstLocation, lPause);return 0;}int GetFramePause(const ArgInfo* arg)//获取首个帧的间隔 在这里我们假设每个帧的间隔一样{/*获取gif的每一帧的时间*/ULONG_PTR gdiplusToken;GdiplusStartupInput gdiplusStartupInput;GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);Image* image = Image::FromFile(arg->szImagePath);//获得有多少个维度，对于gif就一个维度  UINT count = image->GetFrameDimensionsCount();//获得各帧之间的时间间隔  //先获得有多少个时间间隔，PropertyTagFrameDelay是GDI+中预定义的一个GIG属性ID值，表示标签帧数据的延迟时间  UINT   FrameDelayNums = image->GetPropertyItemSize(PropertyTagFrameDelay);PropertyItem *  lpPropertyItem = new  PropertyItem[FrameDelayNums];image->GetPropertyItem(PropertyTagFrameDelay, FrameDelayNums, lpPropertyItem);int lPause = ((int*)lpPropertyItem->value)[0] * 10; //实际上每一个帧的间隔都在数组中,在这里我们仅仅需要一个值return lPause;}UINT OpenGifThread(HWND hWnd, LPCTSTR szImagePath){Info.hwnd = hWnd;Info.szImagePath = szImagePath;if (!IsGif(szImagePath)) //不是gif格式return 0;unsigned int nDummy;m_hThread = (HANDLE)_beginthreadex(NULL, 0, DrawGif, &Info, 0, &nDummy);if (!m_hThread){//ATLTRACE(L"Draw: Couldn't start a GIF animation thread\n");  return FALSE;}else{ResumeThread(m_hThread);}return 1;}bool IsGif(LPCTSTR szImagePath){int length = _tcslen(szImagePath);if (szImagePath[length - 3] != 'g')return false;if (szImagePath[length - 2] != 'i')return false;if (szImagePath[length - 1] != 'f')return false;return true;}void GetGifFrame(void *pImageMemory, BYTE* lpBy, BYTE** pByte, DWORD * nu, DWORD& dwReadedSize,int& num ,DWORD& firstLocation ){ for (DWORD j = 0; j < dwReadedSize; j++){if (lpBy[j] == 0x2c) //图象开头  {if (lpBy[j - 1] == 0x00)             //确认是否图象开头  {if (num == 0){firstLocation = j;     //得到第一副图象位置  }PGifImage nowImage = (PGifImage)&lpBy[j + 1];if (nowImage->Flag.a == 0)    //a为0时指图象不存在局部调色板  {DWORD number = 1 + sizeof(GifImage);while (lpBy[j + number] != 0){number = number + (DWORD)lpBy[j + number] + 1;}                        //算得图象大小  number++;                //把最后一个0x00加上  pByte[num] = new BYTE[number];for (DWORD n = 0; n < number; n++){*(BYTE*)(pByte[num] + n) = lpBy[j + n];}                        //将图象储存起来。  nu[num] = number;j = j + number - 1;            //跳过图象  num++;}else{//当a为1时需要加上局部调色板的大小，其他与a为0时一样  int number = 1 + sizeof(GifImage)+3 * (int)floor(pow(2.0f, nowImage->Flag.d));while (lpBy[j + number] != 0){number = number + (DWORD)lpBy[j + number] + 1;}                        //算得图象大小  number++;                //把最后一个0x00加上  pByte[num] = new BYTE[number];for (DWORD n = 0; n < (DWORD)number; n++){*(BYTE*)(pByte[num] + n) = lpBy[j + n];}                        //将图象储存起来。  nu[num] = number;j = j + number - 1;            //跳过图象  num++;}}}}}void ShowFrame(HWND& hWnd, HGLOBAL& hImageMemory, BYTE* lpBy, BYTE** pByte, DWORD * nu, DWORD& dwReadedSize, int& num, DWORD& firstLocation, int& lPause){HDC hDC = GetDC(hWnd);HDC hMemDC = CreateCompatibleDC(hDC);RECT rt;GetClientRect(hWnd, &rt);int width = rt.right - rt.left;int height = rt.bottom - rt.top;HBITMAP hMemBmp = CreateCompatibleBitmap(hDC, width, height); // 创建兼容位图  HBITMAP hOldMem = (HBITMAP)SelectObject(hMemDC, hMemBmp);Sleep(10);while (true) {for (int m = 0; m < num; m++) {DWORD DDD;//修改页面的保护属性，以进行写操作  VirtualProtect(lpBy, dwReadedSize, PAGE_READWRITE, &DDD);for (DWORD n = 0; n < nu[m]; n++){lpBy[firstLocation + n] = *(BYTE*)(pByte[m] + n);}VirtualProtect(lpBy, dwReadedSize, DDD, NULL);//因为IPicture必须把图象存成流的形式才能工作，所以有下面一段函数  IStream *pIStream;//创建一个IStream接口指针，用来保存图片流  IPicture *pIPicture;//创建一个IPicture接口指针，表示图片对象  CreateStreamOnHGlobal(hImageMemory, false, &pIStream); //用全局内存初使化IStream接口指针  OleLoadPicture(pIStream, 0, false, IID_IPicture, (LPVOID*)&(pIPicture));//用OleLoadPicture获得IPicture接口指针  //得到IPicture COM接口对象后，你就可以进行获得图片信息、显示图片等操作  OLE_XSIZE_HIMETRIC hmWidth;OLE_YSIZE_HIMETRIC hmHeight;pIPicture->get_Width(&hmWidth); //用接口方法获得图片的宽和高  pIPicture->get_Height(&hmHeight);pIPicture->Render(hMemDC, 0, 0, width, height, 0, hmHeight, hmWidth, -hmHeight, NULL); //在指定的DC上绘出图片  //GlobalFree(hImageMemory); //释放全局内存  pIStream->Release(); //释放pIStream  pIPicture->Release(); //释放pIPicture  BitBlt(hDC, 0, 0, width, height, hMemDC, 0, 0, SRCCOPY);Sleep(lPause);                  //停止一段时间。  }}GlobalFree(hImageMemory); //释放全局内存  CloseHandle(m_hThread);SelectObject(hMemDC, hOldMem);DeleteDC(hMemDC);DeleteObject(hMemBmp);}