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ImageList to DIB




This article was contributed by Mike Wild.



In my PrintTree sample I wanted to print the tree in color. This was easy for text, but not for the icons. I tried 
a lot to convert the imagelist to DIB, but what I really needed was a method, which gives back the DIB of one icon, 
not of the whole Imagelist. And here is the used method:



HANDLE CAdvancedTreeCtrl::ImageToDIB( CImageList* pImageList, int iImageNumber, CWnd* pWnd,
                                      BOOL bOverlay, HTREEITEM actualItem )
{
    // Local Variables
    CBitmap 	bitmap;
    CWindowDC	dc( pWnd );

    CDC 		memDC;
    CRect		rect;
    CPalette    	pal;
    IMAGEINFO   	imageInfo;

    if( FALSE == pImageList->GetImageInfo( iImageNumber, &imageInfo ) )
    {
        	// Getting of the Imageinfos failed
        	return NULL;
    }

    // Create compatible stuff and select Bitmap
    if( FALSE == memDC.CreateCompatibleDC( &dc ) )
    {
        	// Create failed
        	return NULL;
    }

    if( FALSE == bitmap.CreateCompatibleBitmap( &dc, 
                                            imageInfo.rcImage.bottom-imageInfo.rcImage.top, 
                                            imageInfo.rcImage.right-imageInfo.rcImage.left ) )
    {
        	// Create failed
        	return NULL;
    }

    CBitmap* pOldBitmap = memDC.SelectObject( &bitmap );
    if( NULL == pOldBitmap )
    {
        	// Select failed
        	return NULL;
    }

    // Local Variables for Draw
    CPoint point( 0, 0);
    UINT nStyle = ILD_NORMAL;

    // Is there an Overlay
    if( TRUE == bOverlay )
    {
        	TV_ITEM     tv_item;

        	// Set up the Item-Struct
        	tv_item.hItem       = actualItem;

        	// Get the full Item-Struct
        	GetItem( &tv_item );

        	// Set the wanted style
        	nStyle = ILD_TRANSPARENT|( tv_item.state & TVIS_OVERLAYMASK );
    }

    // Draw Image to the compatible DC
    if( FALSE == pImageList->Draw( &memDC, iImageNumber, point, nStyle ) )
    {
        	// Drawing of the Image failed
        	return NULL;
    }

    // Create logical palette if device support a palette
    if( dc.GetDeviceCaps( RASTERCAPS ) & RC_PALETTE )
    {
		UINT        nSize   = sizeof(LOGPALETTE) + ( sizeof(PALETTEENTRY) * 256 );
		LOGPALETTE* pLP     = (LOGPALETTE*)new BYTE[nSize];
		pLP->palVersion     = 0x300;
		pLP->palNumEntries = (unsigned short)GetSystemPaletteEntries( dc, 0, 255, 
		pLP->palPalEntry );

		// Create the palette
		pal.CreatePalette( pLP );

		// Free memory
		delete[] pLP;
    }

    memDC.SelectObject( pOldBitmap );

    // Convert the bitmap to a DIB
    return DDBToDIB( bitmap, BI_RGB, &pal );
}








The DDBToDIB-Method is the one already published under "Converting DDB to DIB".


Bugs and Improvements:
Please report all bugs and improvements to me, thanks and enjoy it.


Date Posted: 05/05/98








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© 1998 Zafir Anjum 



Contact me: zafir@home.com