将图象列表转换成设备无关位图

在我的PrintTree例子中，我想打印彩色的树控制.对于文本很容易，但是图标就 不简单了.我试着将图象列表转换成DIB,但是我真正需要的是一个方法，能够取出一 个ICON的DIB，而不是整个图象列表。下面就是我使用的具体方法： 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 ); }