将图象列表转换成设备无关位图

王朝vc·作者佚名  2006-01-08
窄屏简体版  字體: |||超大  

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;

CWindowDCdc( pWnd );

CDC memDC;

CRectrect;

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 );

}

 
 
 
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