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我从网上下的垄建平老师的串口调试程序，运行后能发送数据，但是不能接收！
debug后发现运行到数据类型转换的时候有问题，但是不知道怎么解决，请教大哥！！不胜感激！！（这个问题老师也不给我弄）麻烦写一下这段数据类型转换程序

// SCommTestDlg.cpp : implementation file
//

#include "stdafx.h"
#include "SCommTest.h"
#include "SCommTestDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CSCommTestDlg dialog

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

void CSCommTestDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CSCommTestDlg)
DDX_Control(pDX, IDC_MSCOMM1, m_ctrlComm);
DDX_Text(pDX, IDC_EDIT_RXDATA, m_strRXData);
DDX_Text(pDX, IDC_EDIT_TXDATA, m_strTXData);
//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CSCommTestDlg, CDialog)
//{{AFX_MSG_MAP(CSCommTestDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_BUTTON_MANUALSEND, OnButtonManualsend)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CSCommTestDlg message handlers

BOOL CSCommTestDlg::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
if(m_ctrlComm.GetPortOpen())
    m_ctrlComm.SetPortOpen(FALSE);

    m_ctrlComm.SetCommPort(1); //选择com1
    if( !m_ctrlComm.GetPortOpen())
    m_ctrlComm.SetPortOpen(TRUE);//打开串口
    else
    AfxMessageBox("cannot open serial port");

    m_ctrlComm.SetSettings("9600,n,8,1"); //波特率9600，无校验，8个数据位，1个停止位
    m_ctrlComm.SetRThreshold(1);
 //参数1表示每当串口接收缓冲区中有多于或等于1个字符时将引发一个接收数据的OnComm事件
    m_ctrlComm.SetInputLen(0); //设置当前接收区数据长度为0
    m_ctrlComm.GetInput();//先预读缓冲区以清除残留数据


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

void CSCommTestDlg::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 d

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void CSCommTestDlg::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 CSCommTestDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}

BEGIN_EVENTSINK_MAP(CSCommTestDlg, CDialog)
    //{{AFX_EVENTSINK_MAP(CSCommTestDlg)
ON_EVENT(CSCommTestDlg, IDC_MSCOMM1, 1 /* OnComm */, OnComm, VTS_NONE)
//}}AFX_EVENTSINK_MAP
END_EVENTSINK_MAP()

void CSCommTestDlg::OnComm()
{
// TODO: Add your control notification handler code here
VARIANT variant_inp;
    COleSafeArray safearray_inp;
    LONG len,k;
    BYTE rxdata[2048]; //设置BYTE数组 An 8-bit integerthat is not signed.
    CString strtemp;
    if(m_ctrlComm.GetCommEvent()==2) //事件值为2表示接收缓冲区内有字符
    {             ////////以下你可以根据自己的通信协议加入处理代码
        variant_inp=m_ctrlComm.GetInput(); //读缓冲区
        safearray_inp=variant_inp; //VARIANT型变量转换为ColeSafeArray型变量
        len=safearray_inp.GetOneDimSize(); //得到有效数据长度
        for(k=0;k            safearray_inp.GetElement(&k,rxdata+k);//转换为BYTE型数组
        for(k=0;k        {
            BYTE bt=*(char*)(rxdata+k); //字符型
            strtemp.Format("%c",bt); //将字符送入临时变量strtemp存放
            m_strRXData+=strtemp; //加入接收编辑框对应字符串
        }
    }
    UpdateData(FALSE); //更新编辑框内容
}




void CSCommTestDlg::OnButtonManualsend()
{
// TODO: Add your control notification handler code here
UpdateData(TRUE); //读取编辑框内容
    m_ctrlComm.SetOutput(COleVariant(m_strTXData));//发送数据
}





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