关于工具栏真彩位图的加载问题

/***=========================================================================
====                                                                     ====
====                          D C U t i l i t y                          ====
====                                                                     ====
=============================================================================
====                                                                     ====
====    File name           :  TrueColorToolBar.cpp                      ====
====    Project name        :  Tester                                    ====
====    Project number      :  ---                                       ====
====    Creation date       :  13/1/2003                                 ====
====    Author(s)           :  Dany Cantin                               ====
====                                                                     ====
====                  Copyright ?DCUtility  2003                        ====
====                                                                     ====
=============================================================================
===========================================================================*/

#include "stdafx.h"
#include "TrueColorToolBar.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CTrueColorToolBar

CTrueColorToolBar::CTrueColorToolBar()
{
	m_bDropDown = FALSE;
}

CTrueColorToolBar::~CTrueColorToolBar()
{
}


BEGIN_MESSAGE_MAP(CTrueColorToolBar, CToolBar)
	//{{AFX_MSG_MAP(CTrueColorToolBar)
	ON_NOTIFY_REFLECT(TBN_DROPDOWN, OnToolbarDropDown)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CTrueColorToolBar message handlers
BOOL CTrueColorToolBar::LoadTrueColorToolBar(int  nBtnWidth,
											 UINT uToolBar,
											 UINT uToolBarHot,
											 UINT uToolBarDisabled)
{
	if (!SetTrueColorToolBar(TB_SETIMAGELIST, uToolBar, nBtnWidth))
		return FALSE;
	
	if (uToolBarHot) {
		if (!SetTrueColorToolBar(TB_SETHOTIMAGELIST, uToolBarHot, nBtnWidth))
			return FALSE;
	}

	if (uToolBarDisabled) {
		if (!SetTrueColorToolBar(TB_SETDISABLEDIMAGELIST, uToolBarDisabled, nBtnWidth))
			return FALSE;
	}

	return TRUE;
}


BOOL CTrueColorToolBar::SetTrueColorToolBar(UINT uToolBarType, 
							     	        UINT uToolBar,
										    int  nBtnWidth)
{
	CImageList	cImageList;
	CBitmap		cBitmap;
	BITMAP		bmBitmap;
	
	if (!cBitmap.Attach(LoadImage(AfxGetResourceHandle(), MAKEINTRESOURCE(uToolBar),
								  IMAGE_BITMAP, 0, 0,
								  LR_DEFAULTSIZE|LR_CREATEDIBSECTION)) ||
	    !cBitmap.GetBitmap(&bmBitmap))//存储位图信息到结构体
		return FALSE;


			CSize		cSize(bmBitmap.bmWidth, bmBitmap.bmHeight); //位图大小
			int			nNbBtn	= cSize.cx/nBtnWidth;//按钮个数
			//对于真彩也就是大于256的像素，the actual bitmap data (color) is the color itself, relative intensities of RGB. 
		RGBTRIPLE*	rgb		= (RGBTRIPLE*)(bmBitmap.bmBits);//获得像素内存块地址
			COLORREF	rgbMask	= RGB(rgb[0].rgbtRed, rgb[0].rgbtGreen, rgb[0].rgbtBlue);//获得掩码，掩码就是与的概念吧，目的是背景色和窗口一致
			
			if (!cImageList.Create(nBtnWidth, cSize.cy, ILC_COLOR24|ILC_MASK, nNbBtn, 0))
				return FALSE;
		
//	COLORREF	rgbMask	= RGB(255,255,255);


	if (cImageList.Add(&cBitmap, rgbMask) == -1)
		return FALSE;

	SendMessage(uToolBarType, 0, (LPARAM)cImageList.m_hImageList);
	cImageList.Detach(); 
	cBitmap.Detach();
	
	return TRUE;
}

void CTrueColorToolBar::AddDropDownButton(CWnd* pParent, UINT uButtonID, UINT uMenuID)
{
	if (!m_bDropDown) {
		GetToolBarCtrl().SendMessage(TB_SETEXTENDEDSTYLE, 0, (LPARAM)TBSTYLE_EX_DRAWDDARROWS);
		m_bDropDown = TRUE;
	}

	SetButtonStyle(CommandToIndex(uButtonID), TBSTYLE_DROPDOWN);

	stDropDownInfo DropDownInfo;
	DropDownInfo.pParent	= pParent;
	DropDownInfo.uButtonID	= uButtonID;
	DropDownInfo.uMenuID	= uMenuID;
	m_lstDropDownButton.Add(DropDownInfo);
}

void CTrueColorToolBar::OnToolbarDropDown(NMTOOLBAR* pnmtb, LRESULT *plr)
{
	for (int i = 0; i < m_lstDropDownButton.GetSize(); i++) 
	{
		
		stDropDownInfo DropDownInfo = m_lstDropDownButton.GetAt(i);

		if (DropDownInfo.uButtonID == UINT(pnmtb->iItem)) 
		{

			CMenu menu;
			menu.LoadMenu(DropDownInfo.uMenuID);
			CMenu* pPopup = menu.GetSubMenu(0);
			
			CRect rc;
			SendMessage(TB_GETRECT, (WPARAM)pnmtb->iItem, (LPARAM)&rc);
			ClientToScreen(&rc);
			
			pPopup->TrackPopupMenu(TPM_LEFTALIGN/*|TPM_LEFTBUTTON|TPM_VERTICAL*/,
				                   rc.left, rc.bottom, DropDownInfo.pParent, &rc);
			break;
		}
	}
}