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Visual C++ Article: free image library with image viewer with CxImage and CListCtrl thumbnail images

 
 Show thumbnails of images, include JPG, TIFF, BMP, etc.
 

There are several image libraries with source codes and sources currently available. So I made my mind up to make a free Image Viewer using a free image library, and I got many free demo programs. I think a good image viewer must be able to show thumbnail images in a selected directory. I found some sources showing thumbnails, but they didn't support several formats, only BMP files. This thumbnail viewer is based on CxImage, so if there is an image format supported by CxImage, this viewer also supports that format.

Implementation

I want to show you the core part in this article. How to make a CListCtrl,  and then how to load images and attach that image to an ImageList.

1. Creating CListCtrl and CImageList

I used a CListView instead of CListCtrl, but you know that CListView uses CListCtrl internally. So overriding Create(...) will make your icon view CListCtrl initially. And then on OnInitialUpdate(), make ImageList which can support 24 bit color images and attach to CListCtrl.

return CListView::Create(lpszClassName, _T("ListView"),
  dwStyle|LVS_SHOWSELALWAYS|LVS_ALIGNTOP|LVS_ICON|LVS_SINGLESEL|
  LVS_AUTOARRANGE, rect, pParentWnd, nID, pContext);

....
m_ImageListThumb.Create(THUMBNAIL_WIDTH, THUMBNAIL_HEIGHT, ILC_COLOR24, 0, 1);
 ListCtrl.SetImageList(&m_ImageListThumb, LVSIL_NORMAL);

2. Load Images and Insert Items

Create a Compatible DC and a Bitmap Handle. Stretch a loaded image to the Bitmap Handle and then attach it to CBitmap. Finally, replace CBitmap with an image in the ImageList.

unsigned __stdcall CMyView::LoadThumbNail(LPVOID lpParam)
{
 CMyView* pView=(CMyView*)lpParam;
 CThumbViewerDoc* pDoc=pView->GetDocument();

 CListCtrl& ListCtrl=pView->GetListCtrl();
 CImageList* pImgList=&pView->m_ImageListThumb;

 // reset our image list
 for(int i=0; i<pImgList->GetImageCount(); i++)
  pImgList->Remove(i); 

 // remove all items from list view
 ListCtrl.DeleteAllItems();

 pImgList->SetImageCount(pDoc->m_vFileName.size());

 char path[MAX_PATH];
 vector<CString>::iterator iter;
 
 // Set redraw to FALSE to avoid flickering during adding new items
 ListCtrl.SetRedraw(FALSE);
 int nIndex=0;
 for(iter=pDoc->m_vFileName.begin(); 
     iter!=pDoc->m_vFileName.end() && pView->m_bTerminate!=true; 
     iter++, nIndex++)
 {
          ListCtrl.InsertItem(nIndex, *iter, nIndex);
 }

 ListCtrl.SetRedraw(TRUE);
 ListCtrl.Invalidate();

 // Create Brushes for Border and BackGround
 HBRUSH hBrushBorder=::CreateSolidBrush(RGB(192, 192, 192));
 HBRUSH hBrushBk=::CreateSolidBrush(RGB(255, 255, 255));

 // Border Size
 RECT rcBorder;
 rcBorder.left=rcBorder.top=0;
 rcBorder.right=THUMBNAIL_WIDTH;
 rcBorder.bottom=THUMBNAIL_HEIGHT;

 const float fRatio=(float)THUMBNAIL_HEIGHT/THUMBNAIL_WIDTH;

 int XDest, YDest, nDestWidth, nDestHeight;
 nIndex=0;
 for(iter=pDoc->m_vFileName.begin(); 
     iter!=pDoc->m_vFileName.end() && pView->m_bTerminate!=true; 
     iter++, nIndex++)
 {
  // Load Image File
  sprintf(path, "%s\\%s", pDoc->m_strCurrentDirectory, *iter);

  int nImageType=pDoc->GetTypeFromFileName(path);
  if(nImageType==CXIMAGE_FORMAT_UNKNOWN)
   continue;

  CxImage image(path, nImageType);

  if(image.IsValid()==false)
   continue;

  // Calculate Rect to fit to canvas
  const float fImgRatio=(float)image.GetHeight()/image.GetWidth();
  if(fImgRatio > fRatio)
  {
   nDestWidth=THUMBNAIL_HEIGHT/fImgRatio;
   XDest=(THUMBNAIL_WIDTH-nDestWidth)/2;
   YDest=0;
   nDestHeight=THUMBNAIL_HEIGHT;
  }
  else
  {
   XDest=0;
   nDestWidth=THUMBNAIL_WIDTH;
   nDestHeight=THUMBNAIL_WIDTH*fImgRatio;
   YDest=(THUMBNAIL_HEIGHT-nDestHeight)/2;
  }

  CClientDC cdc(pView);
  HDC hDC=::CreateCompatibleDC(cdc.m_hDC);
  HBITMAP bm = CreateCompatibleBitmap(cdc.m_hDC, THUMBNAIL_WIDTH, 
                                      THUMBNAIL_HEIGHT);
  HBITMAP pOldBitmapImage = (HBITMAP)SelectObject(hDC,bm);
  // Draw Background
  ::FillRect(hDC, &rcBorder, hBrushBk);

  // Draw Image
  image.Stretch(hDC, XDest, YDest, nDestWidth, nDestHeight);

  // Draw Border
  ::FrameRect(hDC, &rcBorder, hBrushBorder);

  SelectObject(hDC, pOldBitmapImage);

  // Attach to Bitmap and Replace image in CImageList
  CBitmap bitmap;
  bitmap.Attach(bm);
  pImgList->Replace(nIndex, &bitmap, NULL);

  // Redraw only a current item for removing flickering and fast speed.
  ListCtrl.RedrawItems(nIndex, nIndex);

  // Release used DC and Object
  DeleteDC(hDC);
  DeleteObject(bm);
 }
 DeleteObject(hBrushBorder);
 DeleteObject(hBrushBk);

 ListCtrl.Invalidate();
 pView->m_bRunning=false;
 pView->m_bTerminate=false;

 _endthreadex( 0 );

 return 0;
}

Other

You can download CxImage freely from here.

 

 

 

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