error LNK2001: unresolved external symbol "public: __thiscall CMySmtpDlg::CMySmt

[ewq21qwe]

从网上下载了几个 邮件收发的程序，但是在vc上运行时出错，百度了一下是说，相关的函数没有实现，但是下载的那几个程序出的错误几乎是一样的，所以我在想会不会不是程序的问题，但是不知道怎么解决。求指教~

一开始的错误是这样子的：
MySmtp.obj : error LNK2001: unresolved external symbol "public: __thiscall CMySmtpDlg::CMySmtpDlg(class CWnd *)" (??0CMySmtpDlg@@QAE@PAVCWnd@@@Z)
nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol __endthreadex
nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol __beginthreadex
libcd.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
Debug/MySmtp.exe : fatal error LNK1120: 4 unresolved externals
执行 link.exe 时出错.

设置了project->settings以后，就只剩下一个错误了：

MySmtp.obj : error LNK2001: unresolved external symbol "public: __thiscall CMySmtpDlg::CMySmtpDlg(class CWnd *)" (??0CMySmtpDlg@@QAE@PAVCWnd@@@Z)
Debug/MySmtp.exe : fatal error LNK1120: 1 unresolved externals
执行 link.exe 时出错.

相关部分源程序：
// MySmtp.cpp : Defines the class behaviors for the application.
//

#include "stdafx.h"
#include "MySmtp.h"
#include "MySmtpDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CMySmtpApp

BEGIN_MESSAGE_MAP(CMySmtpApp, CWinApp)
//{{AFX_MSG_MAP(CMySmtpApp)
// NOTE - the ClassWizard will add and remove mapping macros here.
// DO NOT EDIT what you see in these blocks of generated code!
//}}AFX_MSG
ON_COMMAND(ID_HELP, CWinApp::OnHelp)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMySmtpApp construction

CMySmtpApp::CMySmtpApp()
{
// TODO: add construction code here,
// Place all significant initialization in InitInstance
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CMySmtpApp object

CMySmtpApp theApp;
ofstream LogOut; //日志流全局对象
/////////////////////////////////////////////////////////////////////////////
// CMySmtpApp initialization

BOOL CMySmtpApp::InitInstance()
{
AfxEnableControlContainer();
//create a file to record send log

LogOut.open("SendLog.txt");
if(!LogOut)
{
AfxMessageBox("打开日志文件失败");
return FALSE;
}
LogOut.seekp(0,ios::end);
// Standard initialization
// If you are not using these features and wish to reduce the size
// of your final executable, you should remove from the following
// the specific initialization routines you do not need.

#ifdef _AFXDLL
Enable3dControls(); // Call this when using MFC in a shared DLL
#else
Enable3dControlsStatic(); // Call this when linking to MFC statically
#endif

CMySmtpDlg dlg;
m_pMainWnd = &dlg;
int nResponse = dlg.DoModal();
if (nResponse == IDOK)
{
// TODO: Place code here to handle when the dialog is
// dismissed with OK
}
else if (nResponse == IDCANCEL)
{
// TODO: Place code here to handle when the dialog is
// dismissed with Cancel
}

// Since the dialog has been closed, return FALSE so that we exit the
// application, rather than start the application's message pump.
return FALSE;
}

// MySmtpDlg.h : header file
//

#if !defined(AFX_MYSMTPDLG_H__EC7C3A4B_2FFC_4865_B900_215B054EFEFA__INCLUDED_)
#define AFX_MYSMTPDLG_H__EC7C3A4B_2FFC_4865_B900_215B054EFEFA__INCLUDED_

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

/////////////////////////////////////////////////////////////////////////////
// CMySmtpDlg dialog

#include "ZSmtp.h"
#include "ZFileDialog.h"
#include "ZString.h"

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

// Dialog Data
//{{AFX_DATA(CMySmtpDlg)
enum { IDD = IDD_MYSMTP_DIALOG };
BOOL m_IsHtml;
//}}AFX_DATA

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

// Implementation
......

// MySmtpDlg.cpp : implementation file
#include "stdafx.h"
#include "MySmtp.h"
#include "MySmtpDlg.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
{
......
}
// CMySmtpDlg dialog

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

}

void CMySmtpDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CMySmtpDlg)
DDX_Check(pDX, IDC_CHECK_HTML, m_IsHtml);
//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CMySmtpDlg, CDialog)
//{{AFX_MSG_MAP(CMySmtpDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_BTN_SEND, OnBtnSend)
ON_BN_CLICKED(IDC_BTN_ABOUT, OnBtnAbout)
ON_BN_CLICKED(IDC_BTN_BROWSER, OnBtnBrowser)
ON_BN_CLICKED(IDC_BTN_DELFILE, OnBtnDelfile)
ON_BN_CLICKED(IDC_BUTTON_SENDLOG, OnButtonSendlog)
ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
ON_EN_CHANGE(IDC_EDIT_ACCOUNT, OnChangeEditAccount)
ON_EN_CHANGE(IDC_EDIT_CONTENT, OnChangeEditContent)
ON_CBN_EDITCHANGE(IDC_COMBO_SMTP, OnEditchangeComboSmtp)
ON_CBN_EDITCHANGE(IDC_COMBO_FILELIST, OnEditchangeComboFilelist)
ON_EN_CHANGE(IDC_EDIT_SENDERNAME, OnChangeEditSendername)
ON_WM_CTLCOLOR()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMySmtpDlg message handlers

BOOL CMySmtpDlg::OnInitDialog()
{
//SetDialogBkColor(RGB(255,0,0),RGB(0,255,0));
CDialog::OnInitDialog();

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

//SPLASH
......

[schlafenhamster]

一开始 libcd.lib(crt0.obj) : error LNK2001: unresolved external symbol _main 说明工程类型是 “控制台” 所以 Setting 要改 1 预处理 ——CONSOLE 改 _WINDOWS 2 link 也改 /subsystem:windows

[zgl7903]

向导建立一个 基于对话框的 名为 MySmtp 的 MFC 项目， 然后用这几个文件替换项目中的文件

[ewq21qwe]

已经弄好了，直接打开使用错误的，然后新建了一个MFC工程，再把所有源文件和头文件复制替换，就可以了~

[schlafenhamster]

"再把所有源文件和头文件复制替换" 舍近取远的 方法 ！

[kakabulusi]

选择全部重新编译就可以了。