提示 error LNK2001: 无法解析的外部符号 "class Linklist link" (?link@@3VLinklist@@
做链表作业，都写好了，结果运行的时候突然出来这么个提示，该怎么处理啊，代码上也没看出错误来啊，求大神啊！！！！
程序代码：struct node
{
CString num,name,photo;
node *next;
};
class Linklist
{
private:
node *p;
public:
node *head;
Linklist();
bool add(CString a,CString b);
bool add(CString a,CString b,CString c);
bool del(CString a);
bool del(CString a,CString b);
node* find(CString a);
node* find(CString a,CString b);
bool change(CString a,CString b,CString c);
};
#include "stdafx.h"
#include"linklist.h"
Linklist::Linklist()
{
head=new node;
head->next=NULL;
}
node* Linklist::find(CString a)
{
node *p;
for(p=head->next;p!=NULL;p=p->next)
{
if(p->num==a) return p;
}
return p;
}
node* Linklist::find(CString a,CString b)
{
node *p;
for(p=head->next;p!=NULL;p=p->next)
{
if(p->name==b) return p;
}
return p;
}
bool Linklist::add(CString a, CString b)
{
node *p=find(a);
if(p!=NULL) return 0;
else
{
node *q=new node;
q->next=head->next;
head->next=q;
q->num=a;
q->name=b;
return 1;
}
}
bool Linklist::add(CString a, CString b,CString c)
{
node *p=find(a);
if(p!=NULL) return 0;
else
{
node *q=new node;
q->next=head->next;
head->next=q;
q->num=a;
q->name=b;
q->photo=c;
return 1;
}
}
bool Linklist::del(CString a)
{
node *p,*q;
for(p=head->next,q=head;p!=NULL;p=p->next,q=q->next)
{
if(p->num==a)
{
q->next=p->next;
delete p;
return 1;
}
}
return 0;
}
bool Linklist::del(CString a, CString b)
{
node *p,*q;
for(p=head->next,q=head;p!=NULL;p=p->next,q=q->next)
{
if(p->name==b)
{
q->next=p->next;//MessageBox(NULL,_T("ok"),_T("ok"),MB_ICONWARNING);
delete p;
return 1;
}
}
return 0;
}
bool Linklist::change(CString a, CString b, CString c)
{
node *p=find(a);
if(p==NULL) return 0;
else
{
p->num=a;
p->name=b;
p->photo=c;
return 1;
}
}
// bhtDlg.cpp : 实现文件
//
#include "stdafx.h"
#include "bht.h"
#include "bhtDlg.h"
#include "linklist.h"
extern Linklist link;
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
// 用于应用程序“关于”菜单项的CAboutDlg 对话框
class CAboutDlg : public CDialog
{
public:
CAboutDlg();
// 对话框数据
enum { IDD = IDD_ABOUTBOX };
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV 支持
// 实现
protected:
DECLARE_MESSAGE_MAP()
};
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
}
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
}
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
END_MESSAGE_MAP()
// CbhtDlg 对话框
CbhtDlg::CbhtDlg(CWnd* pParent /*=NULL*/)
: CDialog(CbhtDlg::IDD, pParent)
, t_num(_T(""))
, t_photo(_T(""))
, t_name(_T(""))
{
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
void CbhtDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
DDX_Text(pDX, IDC_EDIT1, t_num);
DDV_MaxChars(pDX, t_num, 100);
DDX_Text(pDX, IDC_EDIT3, t_photo);
DDX_Text(pDX, IDC_EDIT2, t_name);
DDX_Control(pDX, IDC_LIST1, x_list);
DDX_Control(pDX, IDC_photo, m_photo);
}
BEGIN_MESSAGE_MAP(CbhtDlg, CDialog)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
//}}AFX_MSG_MAP
ON_BN_CLICKED(IDC_BUTTON2, &CbhtDlg::OnBnClickedButton2)
ON_BN_CLICKED(IDC_BUTTON3, &CbhtDlg::OnBnClickedButton3)
ON_BN_CLICKED(IDC_BUTTON4, &CbhtDlg::OnBnClickedButton4)
ON_BN_CLICKED(IDC_BUTTON5, &CbhtDlg::OnBnClickedButton5)
ON_BN_CLICKED(IDC_BUTTON1, &CbhtDlg::OnBnClickedButton1)
END_MESSAGE_MAP()
// CbhtDlg 消息处理程序
BOOL CbhtDlg::OnInitDialog()
{
CDialog::OnInitDialog();
// 将“关于...”菜单项添加到系统菜单中。
DWORD dwStyle = x_list.GetExtendedStyle();
dwStyle |= LVS_EX_FULLROWSELECT;//选中某行使整行高亮（只适用与report风格的listctrl）
dwStyle |= LVS_EX_GRIDLINES;//网格线（只适用与report风格的listctrl）
x_list.SetExtendedStyle(dwStyle); //设置扩展风格
x_list.InsertColumn(0,"学号",LVCFMT_LEFT,95,0);
x_list.InsertColumn(1,"姓名",LVCFMT_LEFT,85,1);
// IDM_ABOUTBOX 必须在系统命令范围内。
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);
}
}
// 设置此对话框的图标。当应用程序主窗口不是对话框时，框架将自动
// 执行此操作
SetIcon(m_hIcon, TRUE); // 设置大图标
SetIcon(m_hIcon, FALSE); // 设置小图标
// TODO: 在此添加额外的初始化代码
return TRUE; // 除非将焦点设置到控件，否则返回TRUE
}
void CbhtDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}
// 如果向对话框添加最小化按钮，则需要下面的代码
// 来绘制该图标。对于使用文档/视图模型的MFC 应用程序，
// 这将由框架自动完成。
void CbhtDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // 用于绘制的设备上下文
SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);
// 使图标在工作区矩形中居中
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;
// 绘制图标
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}
//当用户拖动最小化窗口时系统调用此函数取得光标
//显示。
HCURSOR CbhtDlg::OnQueryDragIcon()
{
return static_cast<HCURSOR>(m_hIcon);
}
void CbhtDlg::OnBnClickedButton2()
{
// TODO: 在此添加控件通知处理程序代码'
UpdateData(true);
if(t_num.IsEmpty()) MessageBox("学号不能为空","错误",MB_ICONWARNING);
else if(t_name.IsEmpty()) MessageBox("姓名不能为空","错误",MB_ICONWARNING);
else if(t_photo.IsEmpty())
{
if(link.add(t_num,t_name))
{
x_list.InsertItem(0,t_num);
x_list.SetItemText(0,1,t_name);
}
else MessageBox("该数据已存在","错误",MB_ICONWARNING);
}
else
{
if(link.add(t_num,t_name,t_photo))
{
x_list.InsertItem(0,t_num);
x_list.SetItemText(0,1,t_name);
}
else MessageBox("该数据已存在","错误",MB_ICONWARNING);
}
UpdateData(false);
}
void CbhtDlg::OnBnClickedButton3()
{
// TODO: 在此添加控件通知处理程序代码
UpdateData(true);
if(t_num.IsEmpty()) MessageBox("学号不能为空","错误",MB_ICONWARNING);
else if(t_name.IsEmpty()) MessageBox("姓名不能为空","错误",MB_ICONWARNING);
else
{
if(link.del(t_num,t_name))
{
MessageBox("删除成功");
for(int i=0;;i++)
if(x_list.GetItemText(i,0)==t_num) {x_list.DeleteItem(i);break;}
}
else MessageBox("该数据不存在","错误",MB_ICONWARNING);
}
UpdateData(false);
}
void CbhtDlg::OnBnClickedButton4()
{
// TODO: 在此添加控件通知处理程序代码
UpdateData(true);
node *p;
if(!t_num.IsEmpty()) p=link.find(t_num);
else if(!t_name.IsEmpty()) p=link.find(t_num,t_name);
else {MessageBox("学号和姓名不能全为空","提示");return;}
if(p==NULL) MessageBox("没有找到该数据","提示");
else
{
t_num=p->num;t_name=p->name;t_photo=p->photo;
if(!t_photo.IsEmpty()) photo_show();
}
UpdateData(false);
}
void CbhtDlg::OnBnClickedButton5()
{
// TODO: 在此添加控件通知处理程序代码
UpdateData(true);
if(!t_name.IsEmpty()&&!t_num.IsEmpty())
{
if(link.change(t_num,t_name,t_photo))
{
MessageBox("修改成功","提示");
for(int i=0;;i++)
if(x_list.GetItemText(i,0)==t_num)
{
x_list.SetItemText(i,0,t_num);
x_list.SetItemText(i,1,t_name);
break;
}
if(!t_photo.IsEmpty()) photo_show();
}
else MessageBox("该学号不存在","错误");
}
else {MessageBox("学号或姓名不能为空","提示");return;}
UpdateData(false);
}
void CbhtDlg::OnBnClickedButton1()
{
// TODO: 在此添加控件通知处理程序代码
UpdateData(true);
CFileDialog m_file(true,"bmp",NULL,NULL,"位图文件(.bmp)|*.bmp",this);
if(m_file.DoModal()==IDOK)
{
CString pathname=m_file.GetPathName();
t_photo=pathname;
}
photo_show();
UpdateData(false);
}
void CbhtDlg::photo_show()
{
HBITMAP hbitmap=(HBITMAP)::LoadImage(AfxGetInstanceHandle(),t_photo,IMAGE_BITMAP,0,0,LR_LOADFROMFILE|LR_DEFAULTCOLOR|LR_DEFAULTSIZE);
m_photo.SetBitmap(hbitmap);
/*CRect rect,imageRect;
m_photo.GetWindowRect(imageRect);
this->GetWindowRect(rect);
rect.right=imageRect.right+20;
rect.bottom=imageRect.bottom+20;
this->MoveWindow(rect);*/
}
