重绘listbox遇到个问题向大家请教

[luckywll]

void CMyListBox::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
	// TODO:  添加您的代码以绘制指定项
	COLORREF clrItemText; 
	LPDRAWITEMSTRUCT lpDIS = lpDrawItemStruct; 
	switch ( lpDIS->itemAction ) //lpDIS为一个LPMEASUREITEMSTRUCT（记录控件信息） 
	{ 
	case ODA_SELECT: 
	case ODA_DRAWENTIRE: 
		// Is the item selected? 
		if ( lpDIS->itemState & ODS_SELECTED ) 
		{ 
			clrItemText = GetSysColor( COLOR_HIGHLIGHTTEXT ); 
			// Clear the rectangle 
			FillRect( lpDIS->hDC, &lpDIS->rcItem, (HBRUSH)(COLOR_ACTIVECAPTION+1) ); 
		} 
		else 
		{ 
			clrItemText = GetSysColor( COLOR_WINDOWTEXT ); 
			// Clear the rectangle 
			FillRect( lpDIS->hDC, &lpDIS->rcItem, (HBRUSH)(COLOR_WINDOW+1) ); 
		} 
	} 

	CDC dc; 
	dc.Attach(lpDIS->hDC); 
	CRect rectFull = lpDIS->rcItem; 
	CRect rectName = rectFull; 
	rectName.left = rectFull.left + 60;
	rectName.bottom = rectName.top + 30;
	rectName.right = rectFull.Width() - 1; 
	CRect rectImage = rectFull;
	rectImage.top = rectFull.top + 5;
	rectImage.left = rectFull.left +5;
	rectImage.bottom = rectFull.bottom -5;
	rectImage.right = rectImage.left +50;
	CRect rectID = rectFull;
	rectID.left = rectFull.left + 60;
	rectID.top = rectFull.top + 30;

	UINT nIndex = lpDIS->itemID; 
	LPITEMDATA pItemData = (LPITEMDATA)GetItemDataPtr(nIndex);
	if (nIndex != (UINT) -1) 
	{ 
		if(-1 != pItemData->nImage )
		{
			HICON hIco = m_ImageList.ExtractIcon(pItemData->nImage);
			DrawIcon(dc,rectImage.left,rectImage.top,hIco);
		}

		LOGFONT lf; 
		dc.GetCurrentFont()->GetLogFont(&lf); 
		CFont fontUser, fontID, *pOldFont; 
		//lf.lfCharSet = SHIFTJIS_CHARSET; 
		//lstrcpy(lf.lfFaceName,_T("MS Mincho")); 

		lf.lfHeight=25; 
		lf.lfWidth=0; 
		fontUser.CreateFontIndirect(&lf); 
		pOldFont=dc.SelectObject(&fontUser); 
		dc.SetBkMode(TRANSPARENT); 
		dc.SetTextColor(pItemData->crTextColor); 
		dc.DrawText(pItemData->cstrUserName,CRect(rectName.left+3,rectName.top+3, rectName.right-3,rectName.bottom+3), DT_LEFT | DT_SINGLELINE); 

		lf.lfHeight=20; 
		lf.lfWidth=0; 
		fontID.CreateFontIndirect(&lf); 
		dc.SelectObject(&fontID); 
		dc.SetBkMode(TRANSPARENT); 
		dc.SetTextColor(pItemData->crTextColor); 
		dc.DrawText(pItemData->cstrUserID,CRect(rectID.left+3,rectID.top+3, rectID.right-3,rectID.bottom+3), DT_LEFT | DT_SINGLELINE); 

		dc.SelectObject(pOldFont);
	} 
	dc.Detach(); 
}

问题1：拉伸图标大小，将绘图代码改成
IMAGEINFO info;
m_ImageList.GetImageInfo(pItemData->nImage,&info);
CDC memdc;
memdc.CreateCompatibleDC(&dc);
HICON hIco = m_ImageList.ExtractIcon(pItemData->nImage);
DrawIcon(memdc,0,0,hIco);
dc.StretchBlt(rectImage.left,rectImage.top,rectImage.Width(),rectImage.Height(),&memdc,
0,0,info.rcImage.right-info.rcImage.left, info.rcImage.bottom-info.rcImage.top,SRCCOPY);

图标就显示不出来了，不知道什么原因

问题2：选中的item上文字会有背景，并且拉动scrollbar会导致颜色越来越深，如果是黑色的字，最终会被覆盖，刷新就好了。

[luckywll]

问题2，如果只绘制一行文字，就不会出现背景了，可是就是需要两行

[lgstudyvc]

dc.StretchBlt看各rect的位置对不

2 绘完后刷新下,Invalidate什么的

[luckywll]

dc.StretchBlt(rectImage.left,rectImage.top,rectImage.Width(),rectImage.Height(),&dc,
0,0,info.rcImage.right-info.rcImage.left, info.rcImage.bottom-info.rcImage.top,SRCCOPY);

就能够画出来，但是这样肯定会出现重叠，说明可以画图，memdc有问题，
第二个问题现在出不来了，代码也没动啊。