rs232dlg.cpp

例用MSCOMM控件实现最简单的串口通信

// RS232Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "RS232.h"
#include "RS232Dlg.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()

/////////////////////////////////////////////////////////////////////////////
// CRS232Dlg dialog

CRS232Dlg::CRS232Dlg(CWnd* pParent /*=NULL*/)
	: CDialog(CRS232Dlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CRS232Dlg)
	m_rece = _T("");
	m_send = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CRS232Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CRS232Dlg)
	DDX_Text(pDX, IDC_EDIT_RECE, m_rece);
	DDX_Text(pDX, IDC_EDIT_SEND, m_send);
	DDX_Control(pDX, IDC_MSCOMM, m_mscomm);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CRS232Dlg, CDialog)
	//{{AFX_MSG_MAP(CRS232Dlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDclear, Onclear)
	ON_BN_CLICKED(IDsend, Onsend)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CRS232Dlg message handlers

BOOL CRS232Dlg::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_mscomm.GetPortOpen())
	     m_mscomm.SetPortOpen(FALSE);
	//如果串口是打开的，则关闭，为了确保程序的正确性
	m_mscomm.SetCommPort(1);
	//设置使用端口2
//	m_mscomm.SetInBufferSize(1024);
//	m_mscomm.SetOutBufferSize(512);
	if(!m_mscomm.GetPortOpen())
		m_mscomm.SetPortOpen(TRUE);
	else
		AfxMessageBox("serial port open error");
	//打开端口，失败则弹出提示窗口


	m_mscomm.SetInputMode(1);
	//设置输入方式为二进制方式 
	m_mscomm.SetSettings("9600,n,8,1");
	//设置波特率为9600，无校验位，8数据位，1停止位
	m_mscomm.SetRThreshold(1);
	//串口接收缓冲区中的数据多于或等于一个时产生ONComm事件


	m_mscomm.SetInputLen(0);
	//设置当前接收区数据长度为0，也就是清空
	m_mscomm.GetInput();
	//预读缓冲区，以清除残留数据
	//这里没有设置发送和接收缓冲区的大小，因为以经有预设值
	//发送缓冲区大小为512字节，接收缓冲区为1024字节
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CRS232Dlg::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 CRS232Dlg::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 CRS232Dlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

BEGIN_EVENTSINK_MAP(CRS232Dlg, CDialog)
    //{{AFX_EVENTSINK_MAP(CRS232Dlg)
	ON_EVENT(CRS232Dlg, IDC_MSCOMM, 1 /* OnComm */, Oncomm, VTS_NONE)
	//}}AFX_EVENTSINK_MAP
END_EVENTSINK_MAP()

void CRS232Dlg::Onclear() 
{
	// TODO: Add your control notification handler code here
	m_send="";   
	//清空发送缓冲区
	m_rece="";
	//清空接收缓冲区
	UpdateData(FALSE);
	//更新发送和缓冲区的数据
}

void CRS232Dlg::Onsend() 
{
	// TODO: Add your control notification handler code here
	UpdateData(true);
	//获得窗口数据
	m_mscomm.SetOutput(COleVariant(m_send));
	//发送数据
}

void CRS232Dlg::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_mscomm.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_mscomm.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<len;k++)
            safearray_inp.GetElement(&k,rxdata+k);//转换为BYTE型数组
        for(k=0;k<len;k++) //将数组转换为Cstring型变量
        {
            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_rece+=strtemp; //加入接收编辑框对应字符串 
        }
    }
    UpdateData(FALSE); //更新编辑框内容

}