vc++6.0开发网络典型应用实例导航 1. 本光盘提供了本书中所有的实例源程序文件。 2. 附录文件夹下是Winsock 函数参考以及错误码列表

				/********************************************************************/
				/*																	*/
				/*  ColorListBox.cpp												*/
				/*																	*/
				/*  Implementation of the CColorListBox.							*/
				/*																	*/
				/*  Programmed by Pablo van der Meer								*/
				/*	http://www.pablovandermeer.nl									*/
				/*																	*/
				/*  Last updated: 10 july 2002										*/
				/*																	*/
				/********************************************************************/
				
				
				#include "stdafx.h"
				#include "ColorListBox.h"
				
				#ifdef _DEBUG
				#define new DEBUG_NEW
				#undef THIS_FILE
				static char THIS_FILE[] = __FILE__;
				#endif
				
				
				CColorListBox::CColorListBox()
				{
				}
				
				CColorListBox::~CColorListBox()
				{
				}
				
				
				BEGIN_MESSAGE_MAP(CColorListBox, CListBox)
					//{{AFX_MSG_MAP(CColorListBox)
						// NOTE - the ClassWizard will add and remove mapping macros here.
					//}}AFX_MSG_MAP
				END_MESSAGE_MAP()
				
				
				/********************************************************************/
				/*																	*/
				/* Function name : AddString										*/		
				/* Description   : Add string to the listbox and save color info.	*/
				/*																	*/
				/********************************************************************/
				int CColorListBox::AddString(LPCTSTR lpszItem, COLORREF itemColor)
				{
					// Add the string to the list box
					int nIndex = CListBox::AddString(lpszItem);
				   
					// save color data
					if (nIndex >= 0)
						SetItemData(nIndex, itemColor);
				
					return nIndex;
				}
				
				
				/********************************************************************/
				/*																	*/
				/* Function name : DrawItem											*/		
				/* Description   : Called by the framework when a visual aspect of	*/
				/*				   an owner-draw list box changes.					*/
				/*																	*/
				/********************************************************************/
				void CColorListBox::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct) 
				{
				    // Losing focus ?
				    if (lpDrawItemStruct->itemID == -1) 
					{
						DrawFocusRect(lpDrawItemStruct->hDC, &lpDrawItemStruct->rcItem);
						return;
				    }
				
					CDC* pDC = CDC::FromHandle(lpDrawItemStruct->hDC);
				
					COLORREF clrOld;
					CString sText;
					
					// get color info from item data
					COLORREF clrNew = (COLORREF)(lpDrawItemStruct->itemData);
				
					// item selected ?
					if ((lpDrawItemStruct->itemState & ODS_SELECTED) &&
						 (lpDrawItemStruct->itemAction & (ODA_SELECT | ODA_DRAWENTIRE)))
					{
						CBrush brush(::GetSysColor(COLOR_HIGHLIGHT));
						pDC->FillRect(&lpDrawItemStruct->rcItem, &brush);
					}
				
					// item deselected ?
					if (!(lpDrawItemStruct->itemState & ODS_SELECTED) &&	
						(lpDrawItemStruct->itemAction & ODA_SELECT))
					{
						CBrush brush(::GetSysColor(COLOR_WINDOW));
						pDC->FillRect(&lpDrawItemStruct->rcItem, &brush);
					}	 	
				
					// item has focus ?
					if ((lpDrawItemStruct->itemAction & ODA_FOCUS) && 
						(lpDrawItemStruct->itemState & ODS_FOCUS))
					{
						pDC->DrawFocusRect(&lpDrawItemStruct->rcItem); 
					}
				
					// lost focus ?
					if ((lpDrawItemStruct->itemAction & ODA_FOCUS) &&	
						!(lpDrawItemStruct->itemState & ODS_FOCUS))
					{
						pDC->DrawFocusRect(&lpDrawItemStruct->rcItem); 
					}
				
					// set the background mode to TRANSPARENT
					int nBkMode = pDC->SetBkMode(TRANSPARENT);
				
					if (lpDrawItemStruct->itemState & ODS_SELECTED)
						clrOld = pDC->SetTextColor(::GetSysColor(COLOR_HIGHLIGHTTEXT));
					else 
					if (lpDrawItemStruct->itemState & ODS_DISABLED)
						clrOld = pDC->SetTextColor(::GetSysColor(COLOR_GRAYTEXT));
					else
						clrOld = pDC->SetTextColor(clrNew);
				
					// get item text
					GetText(lpDrawItemStruct->itemID, sText);
					CRect rect = lpDrawItemStruct->rcItem;
				
					// text format
					UINT nFormat = DT_LEFT | DT_SINGLELINE | DT_VCENTER;
					if (GetStyle() & LBS_USETABSTOPS)
						nFormat |= DT_EXPANDTABS;
					
					// draw the text
					pDC->DrawText(sText, -1, &rect, nFormat);
				
					// restore old values
					pDC->SetTextColor(clrOld); 
					pDC->SetBkMode(nBkMode);
				}
				
				
				void CColorListBox::MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct) 
				{
					lpMeasureItemStruct->itemHeight = ::GetSystemMetrics(SM_CYMENUCHECK);	
				}