Добрый вечер!
  Я пытаюсь написать прогу для работы с ком портом в асинхронном режиме, вот навояла код
[code=cpp]
// Com_ProjectDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Com_Project.h"
#include "Com_ProjectDlg.h"
#include ".\com_projectdlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
    CAboutDlg();

// Dialog Data
    enum { IDD = IDD_ABOUTBOX };

    protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

// Implementation
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()


// CCom_ProjectDlg dialog



CCom_ProjectDlg::CCom_ProjectDlg(CWnd* pParent /*=NULL*/)
    : CDialog(CCom_ProjectDlg::IDD, pParent)
{
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CCom_ProjectDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    DDX_Control(pDX, IDC_COMBO1, n_com);
    DDX_Control(pDX, IDC_EDIT2, m_ed);
}

BEGIN_MESSAGE_MAP(CCom_ProjectDlg, CDialog)
    ON_WM_SYSCOMMAND()
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    //}}AFX_MSG_MAP
    ON_BN_CLICKED(IDC_BUTTON1, OnBnClickedButton1)
END_MESSAGE_MAP()


// CCom_ProjectDlg message handlers

BOOL CCom_ProjectDlg::OnInitDialog()
{
    CDialog::OnInitDialog();

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