JPG图片的显示问题?

何吉元yuan 2008-1-28 15:13 楼主

下面是在网上找的代码,可是不知为什么报这样的错误?
Mywork.obj : error LNK2019: unresolved external symbol __imp__OleLoadPicture referenced in function "long __cdecl ShowPic(char *,struct HWND__ *,int,int)" (?ShowPic@@YAJPADPAUHWND__@@HH@Z)
Mywork.obj : error LNK2001: unresolved external symbol _IID_IPicture
Mywork.obj : error LNK2019: unresolved external symbol __imp__CreateStreamOnHGlobal referenced in function "long __cdecl ShowPic(char *,struct HWND__ *,int,int)" (?ShowPic@@YAJPADPAUHWND__@@HH@Z)
emulatorDbg/Mywork.exe : fatal error LNK1120: 3 unresolved externals
请各位大侠指点一下小弟该怎么办啊?在VC6.0++下可以编译通过,可在EVC4.0下面就编译不过了,出现了上面的问题.

//    lpstrFile：文件名（最好是包含路径在内）
//    hWnd
//    nScrWidth：输出图片的宽度
//    nScrHeight：输出图片的高度
//    nScrWidth、nScrHeight是输出图片的实际大小，换而言之是指缩放后的尺寸
HRESULT    ShowPic(char *lpstrFile,HWND hWnd,int nScrWidth,int nScrHeight)
{
      HDC    hDC_Temp=GetDC(hWnd);

      IPicture    *pPic;
      IStream       *pStm;
//       AfxOleInit();
      BOOL    bResult;
      HANDLE    hFile=NULL;
//       DWORD    dwFileSize,dwByteRead;
LONG    dwFileSize;
DWORD dwByteRead;
   //打开硬盘中的图形文件
      hFile=CreateFile(_T("lpstrFile"),GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
      if(hFile!=NULL)//INVALID_HANDLE_value)
            {
               dwFileSize=GetFileSize(hFile,NULL);//获取文件字节数
               if(dwFileSize==0xFFFFFFFF)
               return    E_FAIL;
            }
      else    return    E_FAIL;

//分配全局存储空间
   HGLOBAL    hGlobal = GlobalAlloc(GMEM_MOVEABLE, dwFileSize);
   LPVOID       pvData    = NULL;
   if(hGlobal == NULL)
   return    E_FAIL;
   if((pvData = GlobalLock(hGlobal)) == NULL)//锁定分配内存块
   return    E_FAIL;
   ReadFile(hFile,pvData,dwFileSize,&dwByteRead,NULL);//把文件读入内存缓冲区
   GlobalUnlock(hGlobal);
   CreateStreamOnHGlobal(hGlobal,    TRUE,    &pStm);
//装入图形文件
   bResult=OleLoadPicture(pStm,dwFileSize,TRUE,IID_IPicture,(LPVOID*)&pPic);
//    (LPSTREAM lpstream, LONG lSize, BOOL fRunmode,REFIID riid, LPVOID FAR* lplpvObj);    REFIID riid//创建的Com对象的接口标识符
   if(FAILED(bResult))
   return    E_FAIL;
   OLE_XSIZE_HIMETRIC    hmWidth;//图片的真实宽度
   OLE_YSIZE_HIMETRIC    hmHeight;//图片的真实高度
   pPic-> get_Width(&hmWidth);
   pPic-> get_Height(&hmHeight);
//将图形输出到屏幕上（有点像BitBlt）
bResult=pPic-> Render(hDC_Temp,0,0,nScrWidth,nScrHeight,0,hmHeight,hmWidth,-hmHeight,NULL);
pPic-> Release();
CloseHandle(hFile);//关闭打开的文件
if(SUCCEEDED(bResult))          return    S_OK;
else    return    E_FAIL;
}