Loading JPEG files

Loading JPEG files

• Frank I. garcia

  Found none.
  
  

• Glandorf

  www.wotsit.com
  
  

• Calvinator

  Thanks martin.
  
  You've done it this time [:}]
  
  

• AmR EiSa

  http://www.graphics.net.cn/article/001/038.asp
  
  

• S. Allard

  I knew one solution.
  The below code supports GIF, BMP
  , JPG and so on.
  
  Have a Good Programming!!!
  
  -------------------------------------------------
  
  HRESULT LoadPicture(LPCTSTR szType, LPTSTR szID, char OverrideBPP,LPPICTURE* ppv)
  {
   HRSRC hRes;
   LPVOID pMem;
   HGLOBAL pGlobal;
   LPPICTURE pPic=0;
   LPSTREAM pStream=0;
   HBITMAP hBmp=0,hRetBmp;
   BITMAP bmp;
   HDC hDCDest,hDCSrc;
   DWORD dwSize;
   int file;
   DWORD dwRead,dwTotal;
   PICTDESC pd;
   if (!szID || !ppv) return E_INVALIDARG;
   if (!szType)
   {
    file=_topen(szID,_O_RDONLY | _O_BINARY);
    if (file==-1) goto Err;
    dwSize=_filelength(file);
    pGlobal=GlobalAlloc(0,dwSize);
    dwRead=0;dwTotal=0;
    
    while (dwTotal<dwSize){
     dwRead=_read(file,((LPBYTE)pGlobal)+dwTotal,512); //Read sector by sector
     if (!dwRead) {_close(file);goto Err;}
     dwTotal+=dwRead;
    }
    _close(file);
   } else {
    hRes=FindResource(NULL,szID,szType);
    if (!hRes) return NULL;
    pMem=LoadResource(NULL,hRes);
    if (!pMem) return NULL;
    dwSize=SizeofResource(NULL,hRes);

    pGlobal=GlobalAlloc(0,dwSize);
    memcpy(pGlobal,pMem,dwSize);
   }

   if (FAILED(CreateStreamOnHGlobal(pGlobal,FALSE,&pStream))) goto Err;
   
   if (FAILED(OleLoadPicture(pStream,dwSize,TRUE,IID_IPicture,(LPVOID*)&pPic))) goto Err;
   
   pStream->Release(); pStream=0;
   GlobalFree(pGlobal);pGlobal=0;
   if (OverrideBPP<=0) {
    *ppv=pPic;
   } else {

    if (FAILED(pPic->get_Handle((OLE_HANDLE*)&hBmp))) goto Err;
    hDCSrc=CreateCompatibleDC(0);
    GetObject(hBmp,sizeof(BITMAP),&bmp);
    hBmp=(HBITMAP)SelectObject(hDCSrc,hBmp);
    hRetBmp=CreateBitmap(bmp.bmWidth,bmp.bmHeight,1,OverrideBPP,NULL);
    hDCDest=CreateCompatibleDC(0);
    hRetBmp=(HBITMAP)SelectObject(hDCDest,hRetBmp);
    BitBlt(hDCDest,0,0,bmp.bmWidth,bmp.bmHeight,hDCSrc,0,0,SRCCOPY);
    SelectObject(hDCSrc,hBmp);
    hRetBmp=(HBITMAP)SelectObject(hDCDest,hRetBmp);
    DeleteDC(hDCSrc);hDCSrc=0;
    DeleteDC(hDCDest);hDCDest=0;
    pPic->Release();pPic=NULL;

    pd.cbSizeofstruct=sizeof(PICTDESC);
    pd.picType=PICTYPE_BITMAP;
    pd.bmp.hbitmap=hRetBmp;
    pd.bmp.hpal=NULL;
    if (FAILED(OleCreatePictureIndirect(&pd,IID_IPicture,TRUE,(LPVOID*)&pPic))) {DeleteObject(hRetBmp); return E_FAIL;}
   }
   return S_OK;
  Err:
   if (pStream) {pStream->Release();}
   if (pGlobal) GlobalFree(pGlobal);
   if (pPic) pPic->Release();
   if (hBmp) DeleteObject(hBmp);
   return E_FAIL;
  }

  //For use IPicture you can use
  HBITMAP LoadPictureEx(LPTSTR szFile)
  {
   HBITMAP hBmp;
   LPPICTURE pPic=NULL;
   if (FAILED(LoadPicture(NULL, szFile,0,&pPic)))
    goto Err;
   if (FAILED(pPic->get_Handle((OLE_HANDLE *)&hBmp)))
    goto Err;
   hBmp = (HBITMAP)CopyImage(hBmp,IMAGE_BITMAP,0,0,LR_CREATEDIBSECTION);
   if (!hBmp)
    goto Err;
   pPic->Release();
   return hBmp;
  Err:
   if (pPic != NULL) pPic->Release();
   return NULL;
  }
  

  
  
  

• vaibhavsaxena17

  Look at IPicture
  http://msdn.microsoft.com/library/default.asp url=/library/en-us/com/html/42e3cd0e-2413-494a-8be8-2952089e02d2.asp
  http://msdn.microsoft.com/msdnmag/issues/01/10/c/
  http://msdn.microsoft.com/msdnmag/issues/02/03/c/
  
  
  

• rashe

  Thanks
  
  Out of curiosity may I ask what is the file structure of a JPEG and a GIF.
  
  Can't help it you know.
  
  

• Cadabuz

  Sorry its www.wotsit.org
  
  
• Loading JPEG files