请高手帮忙回答，在龚建伟老师的串口调试中遇到了Serial串口类的问题

Question

点击打开串口按钮时，就会弹出以上图片的错误，

代码如下
// SerialPortTestDlg.h : header file
//
#include"SerialPort.h"

#if !defined(AFX_SERIALPORTTESTDLG_H__37F6643D_1905_4655_883E_24AD7F141ED0__INCLUDED_)
#define AFX_SERIALPORTTESTDLG_H__37F6643D_1905_4655_883E_24AD7F141ED0__INCLUDED_

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

/////////////////////////////////////////////////////////////////////////////
// CSerialPortTestDlg dialog

class CSerialPortTestDlg : public CDialog
{
// Construction
public:
CSerialPortTestDlg(CWnd* pParent = NULL); // standard constructor
CSerialPort m_SerialPort; //CSerailPort类对象
BOOL m_bSerialPortOpened; //标志串口是否打开
// Dialog Data
//{{AFX_DATA(CSerialPortTestDlg)
enum { IDD = IDD_SERIALPORTTEST_DIALOG };
CComboBox m_ctrlComboComPort;
CString m_strEditReceiveMsg;
CString m_strEditSendMsg;
//}}AFX_DATA

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

// Implementation
protected:
HICON m_hIcon;

// Generated message map functions
//{{AFX_MSG(CSerialPortTestDlg)
virtual BOOL OnInitDialog();
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
afx_msg LONG OnComm(WPARAM ch, LPARAM port);
afx_msg void OnPaint();
afx_msg HCURSOR OnQueryDragIcon();
afx_msg void OnButtonOpen();
afx_msg void OnButtonClose();
afx_msg void OnButtonSend();
//}}AFX_MSG
DECLARE_MESSAGE_MAP()

};

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

#endif // !defined(AFX_SERIALPORTTESTDLG_H__37F6643D_1905_4655_883E_24AD7F141ED0__INCLUDED_)

// SerialPortTestDlg.cpp : implementation file
//

#include "stdafx.h"
#include "SerialPortTest.h"
#include "SerialPortTestDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CSerialPortTestDlg dialog

CSerialPortTestDlg::CSerialPortTestDlg(CWnd* pParent /*=NULL*/)
: CDialog(CSerialPortTestDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CSerialPortTestDlg)
m_strEditReceiveMsg = _T("");
m_strEditSendMsg = _T("");
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
m_bSerialPortOpened=FALSE; //初始状态：串口没有打开
}

void CSerialPortTestDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CSerialPortTestDlg)
DDX_Control(pDX, IDC_COMBO_COMPORT, m_ctrlComboComPort);
DDX_Text(pDX, IDC_EDIT_RECEIVEMSG, m_strEditReceiveMsg);
DDX_Text(pDX, IDC_EDIT_SENDMSG, m_strEditSendMsg);
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CSerialPortTestDlg, CDialog)
//{{AFX_MSG_MAP(CSerialPortTestDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_BUTTON_OPEN, OnButtonOpen)
ON_BN_CLICKED(IDC_BUTTON_CLOSE, OnButtonClose)
ON_MESSAGE(WM_COMM_RXCHAR, OnComm)
ON_BN_CLICKED(IDC_BUTTON_SEND, OnButtonSend)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CSerialPortTestDlg message handlers

BOOL CSerialPortTestDlg::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
m_ctrlComboComPort.SetCurSel(0); //初始选择串口1
//以下两句分别设置“打开串口”、“关闭串口”两个按状态的使能状态
GetDlgItem(IDC_BUTTON_OPEN)->EnableWindow(!m_bSerialPortOpened);
GetDlgItem(IDC_BUTTON_CLOSE)->EnableWindow(m_bSerialPortOpened);

return TRUE;  // return TRUE  unless you set the focus to a control

}

void CSerialPortTestDlg::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 CSerialPortTestDlg::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 CSerialPortTestDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}
LONG CSerialPortTestDlg::OnComm(WPARAM ch, LPARAM port)
{
m_strEditReceiveMsg += ch;
UpdateData(FALSE); //将接收到的字符显示在接收编辑框中
return 0;
}

void CSerialPortTestDlg::OnButtonOpen()
{
// TODO: Add your control notification handler code here
int nPort=m_ctrlComboComPort.GetCurSel()+1; //得到串口号，想想为什么要加1
if(m_SerialPort.InitPort(this, nPort, 9600,'N',8,1,EV_RXFLAG | EV_RXCHAR,512))
{
m_SerialPort.StartMonitoring();
m_bSerialPortOpened=TRUE;
}
else
{
AfxMessageBox("没有发现此串口或被占用");
m_bSerialPortOpened=FALSE;
}
GetDlgItem(IDC_BUTTON_OPEN)->EnableWindow(!m_bSerialPortOpened);
GetDlgItem(IDC_BUTTON_CLOSE)->EnableWindow(m_bSerialPortOpened);
}

void CSerialPortTestDlg::OnButtonClose()
{
// TODO: Add your control notification handler code here
m_SerialPort.ClosePort();//关闭串口
m_bSerialPortOpened=FALSE;
GetDlgItem(IDC_BUTTON_OPEN)->EnableWindow(!m_bSerialPortOpened);
GetDlgItem(IDC_BUTTON_CLOSE)->EnableWindow(m_bSerialPortOpened);
}

void CSerialPortTestDlg::OnButtonSend()
{
// TODO: Add your control notification handler code here
if(!m_bSerialPortOpened) return; //检查串口是否打开
UpdateData(TRUE); //读入编辑框中的数据
m_SerialPort.WriteToPort((LPCTSTR)m_strEditSendMsg);//发送数据
}

Answer 1

系统认为你的COM口只能是COM1-COM4,你可能选了一个超出范围的,(或者没有选?)