Организовать передачу данных через СОМ-порт между двумя компьютерами

// laba1Dlg.cpp : implementation file
//
 
#include "stdafx.h"
#include "laba1.h"
#include "laba1Dlg.h"
#include "ComPort.h"
 
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
 
/////////////////////////////////////////////////////////////////////////////
// CLaba1Dlg dialog
 
CLaba1Dlg::CLaba1Dlg(CWnd* pParent /*=NULL*/)
    : CDialog(CLaba1Dlg::IDD, pParent)
{
    //{{AFX_DATA_INIT(CLaba1Dlg)
    m_Edit = _T("");
    //}}AFX_DATA_INIT
    // Note that LoadIcon does not require a subsequent DestroyIcon in Win32
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
 
void CLaba1Dlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    //{{AFX_DATA_MAP(CLaba1Dlg)
    DDX_Text(pDX, IDC_EDIT1, m_Edit);
    //}}AFX_DATA_MAP
}
 
BEGIN_MESSAGE_MAP(CLaba1Dlg, CDialog)
    //{{AFX_MSG_MAP(CLaba1Dlg)
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()
 
/////////////////////////////////////////////////////////////////////////////
// CLaba1Dlg message handlers
 
BOOL CLaba1Dlg::OnInitDialog()
{
    CDialog::OnInitDialog();
 
    // 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
    
    return TRUE;  // return TRUE  unless you set the focus to a control
}
 
// 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 CLaba1Dlg::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 CLaba1Dlg::OnQueryDragIcon()
{
    return (HCURSOR) m_hIcon;
}
 
int CLaba1Dlg::WriteString(string Str)
{
    PurgeComm(hPort,PURGE_TXCLEAR | PURGE_RXCLEAR);
    Str = Str + "\r";
    DWORD dwError , dwNumBytesWritten;
    WriteFile(
        hPort,
        Str.c_str(),
        Str.length(),
        &dwNumBytesWritten,
        NULL);
    return (int)dwNumBytesWritten;
}
 
int CLaba1Dlg ::Open()
{
    hPort = CreateFile(
        ComPortName.c_str(),
        GENERIC_READ | GENERIC_WRITE,
        0,
        NULL,
        OPEN_EXISTING,
        0,
        NULL
        );
    if(hPort == INVALID_HANDLE_VALUE)
    {
        return 0;
    }
    DCB PortDCB;
 
    PortDCB.DCBlength = sizeof(DCB);
 
 
    GetCommState(hPort , &PortDCB);
 
    PortDCB.BaudRate = 9600;
    PortDCB.fBinary = true;  //!
    PortDCB.fParity = true;
    PortDCB.fOutxCtsFlow = false;
    PortDCB.fOutxDsrFlow = false;
    PortDCB.fDtrControl = DTR_CONTROL_ENABLE;
 
    PortDCB.fDsrSensitivity = false;
    PortDCB.fTXContinueOnXoff = false;
    PortDCB.fOutX = false;
    PortDCB.fInX = false;
    PortDCB.fErrorChar = true;
    PortDCB.fNull = false;
    PortDCB.fRtsControl = RTS_CONTROL_ENABLE;
 
    PortDCB.fAbortOnError = false;
 
    PortDCB.ByteSize = 8;
    PortDCB.Parity = NOPARITY;
    PortDCB.StopBits = ONESTOPBIT;
//    PortDCB.EofChar = '!';
 
    if(!SetCommState(hPort , &PortDCB))
    {
        return 0;
//        ShowMessage("Unable to configure the serial port");
    }
 
    COMMTIMEOUTS CommTimeouts;
 
    GetCommTimeouts(hPort,&CommTimeouts);
 
 
 
    CommTimeouts.ReadIntervalTimeout = 50;
    CommTimeouts.ReadTotalTimeoutMultiplier = 1;
    CommTimeouts.ReadTotalTimeoutConstant = 50;
    CommTimeouts.WriteTotalTimeoutMultiplier = 1;
    CommTimeouts.WriteTotalTimeoutConstant = 50;
 
    SetCommTimeouts(hPort,&CommTimeouts);
    FlushFileBuffers(hPort);
    Opened = true;
    return 1;
}
 
int CLaba1Dlg ::Close()
{
    if(Opened)
    {
        CloseHandle(hPort);
        Opened = false;
        return 1;
    }    
    else
        return 0;
}
 
void CLaba1Dlg::OnButton1() 
{
    // TODO: Add your control notification handler code here
    Open();
            WriteString(m_Edit.LoadString);
           Close();
}