请帮忙看看程序代码（网络编程初步）

DryFisHH 2004-07-30 04:17:20

开始学网络编程，看《vc++6.0实效编程百例》第84个例子：获得主机名和IP地址，
编译链接所附的代码，却运行不了，不知道是什么原因。

我的操作系统是win2000 server

下面是主要部分的源码：
// NetWorkDlg.h : header file
//

#if !defined(AFX_NETWORKDLG_H__2E21CA0F_C415_11D3_9E0B_00A0C9395AB0__INCLUDED_)
#define AFX_NETWORKDLG_H__2E21CA0F_C415_11D3_9E0B_00A0C9395AB0__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

/////////////////////////////////////////////////////////////////////////////
// CNetWorkDlg dialog

class CNetWorkDlg : public CDialog
{
// Construction
public:
void GetIP();
CNetWorkDlg(CWnd* pParent = NULL); // standard constructor

// Dialog Data
//{{AFX_DATA(CNetWorkDlg)
enum { IDD = IDD_NETWORK_DIALOG };
CString m_hostname;
CString m_ipaddress;
//}}AFX_DATA

// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CNetWorkDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL

// Implementation
protected:
HICON m_hIcon;

// Generated message map functions
//{{AFX_MSG(CNetWorkDlg)
virtual BOOL OnInitDialog();
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
afx_msg void OnPaint();
afx_msg HCURSOR OnQueryDragIcon();
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_NETWORKDLG_H__2E21CA0F_C415_11D3_9E0B_00A0C9395AB0__INCLUDED_)

// NetWorkDlg.cpp : implementation file
//

#include "stdafx.h"
#include "NetWork.h"
#include "NetWorkDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
CAboutDlg();

// Dialog Data
//{{AFX_DATA(CAboutDlg)
enum { IDD = IDD_ABOUTBOX };
//}}AFX_DATA

// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAboutDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL

// Implementation
protected:
//{{AFX_MSG(CAboutDlg)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
//{{AFX_DATA_INIT(CAboutDlg)
//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CAboutDlg)
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
// No message handlers
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CNetWorkDlg dialog

CNetWorkDlg::CNetWorkDlg(CWnd* pParent /*=NULL*/)
: CDialog(CNetWorkDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CNetWorkDlg)
m_hostname = _T("");
m_ipaddress = _T("");
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CNetWorkDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CNetWorkDlg)
DDX_Text(pDX, IDC_EDIT1, m_hostname);
DDX_Text(pDX, IDC_EDIT2, m_ipaddress);
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CNetWorkDlg, CDialog)
//{{AFX_MSG_MAP(CNetWorkDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CNetWorkDlg message handlers

BOOL CNetWorkDlg::OnInitDialog()
{
CDialog::OnInitDialog();

// Add "About..." menu item to system menu.

// IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);

CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}

// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon

// TODO: Add extra initialization here
//获得IP和主机名
GetIP();
return TRUE; // return TRUE unless you set the focus to a control
}

void CNetWorkDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}

// If you add a minimize button to your dialog, you will need the code below
// to draw the icon. For MFC applications using the document/view model,
// this is automatically done for you by the framework.

void CNetWorkDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting

SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

// Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;

// Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}

// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CNetWorkDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}

void CNetWorkDlg::GetIP()
{
char szhostname[128];
CString str;
//获得主机名
if( gethostname(szhostname, 128) == 0 )
{
// 获得主机ip地址
struct hostent * phost;
int i;
phost = gethostbyname(szhostname);
m_hostname=szhostname;
i=0;
int j;
int h_length=4;
for( j = 0; j<h_length; j++ )
{
CString addr;

if( j > 0 )
str += ".";

addr.Format("%u", (unsigned int)((unsigned
char*)phost->h_addr_list[i])[j]);
str += addr;
}

}
m_ipaddress=str;
UpdateData(FALSE);

}

谢谢了

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