evctestcomdlg.cpp

我编写的一个EVC下的串口测试程序

// EVCTestCOMDlg.cpp : implementation file
//

#include "stdafx.h"
#include "EVCTestCOM.h"
#include "EVCTestCOMDlg.h"
#include "winerror.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

static HANDLE hComport;

/////////////////////////////////////////////////////////////////////////////
// CEVCTestCOMDlg dialog

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

void CEVCTestCOMDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CEVCTestCOMDlg)
	DDX_Text(pDX, IDC_EDIT1, m_send);
	DDX_Text(pDX, IDC_EDIT2, m_recv);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CEVCTestCOMDlg, CDialog)
	//{{AFX_MSG_MAP(CEVCTestCOMDlg)
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	ON_BN_CLICKED(IDC_BUTTON2, OnButton2)
	ON_WM_DESTROY()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEVCTestCOMDlg message handlers

BOOL CEVCTestCOMDlg::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
	
	CenterWindow(GetDesktopWindow());	// center to the hpc screen

	// TODO: Add extra initialization here

	DCB dcb;
	COMMTIMEOUTS timeouts;	 

    hComport = CreateFile(L"COM2:", GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0);

	if (hComport == INVALID_HANDLE_VALUE)
	{
		CString err;

		err.Format(L"COM open failed ! error = %d", GetLastError());
        MessageBox(err, L"Error", MB_ICONERROR);
	}
	else
	{
        GetCommState(hComport ,&dcb);

		dcb.BaudRate = 38400;
		dcb.ByteSize = 8;
		dcb.StopBits = ONESTOPBIT;
		dcb.fParity = FALSE;
		dcb.Parity = NOPARITY;
		dcb.fOutxCtsFlow = FALSE;
		dcb.fOutxDsrFlow = FALSE;
		dcb.fOutX = FALSE;
		dcb.fInX = FALSE;
		dcb.fDtrControl = DTR_CONTROL_ENABLE;
		dcb.fRtsControl = RTS_CONTROL_ENABLE;
		dcb.fDsrSensitivity = FALSE;
		dcb.fErrorChar = FALSE;
		dcb.fAbortOnError = FALSE;

		SetCommState(hComport, &dcb);

		timeouts.ReadIntervalTimeout = MAXWORD;
		timeouts.ReadTotalTimeoutMultiplier = 0;
		timeouts.ReadTotalTimeoutConstant = 0;
		timeouts.WriteTotalTimeoutMultiplier = 0;
		timeouts.WriteTotalTimeoutConstant = 0;
		SetCommTimeouts(hComport, &timeouts);
	}
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CEVCTestCOMDlg::OnButton1() 
{
	char tx_buf[1024];
	DWORD bytes_written;

	UpdateData(TRUE); 

	for (int i = 0; i < m_send.GetLength(); i++)
	{
		tx_buf[i] = (char)m_send[i];
	}

	tx_buf[m_send.GetLength()] = '\0';

	PurgeComm(hComport, PURGE_TXCLEAR|PURGE_RXCLEAR);
	WriteFile(hComport, tx_buf, (DWORD)strlen(tx_buf), &bytes_written, 0);

	CString str;
	str.Format(L"Send bytes: %d", bytes_written);
	MessageBox(str);
}

void CEVCTestCOMDlg::OnButton2() 
{
	DWORD bytes_read = 0;
	DWORD errors;
	COMSTAT stat;
	char response[1024];

	response[0] = '\0';
	ClearCommError(hComport, &errors, &stat);

	if (stat.cbInQue > 0)
	{
		ReadFile(hComport, response, stat.cbInQue, &bytes_read, 0);
	}

	response[bytes_read] = '\0';

	m_recv = response;
	UpdateData(FALSE);

	CString str;
	str.Format(L"Receive bytes: %d", bytes_read);
	MessageBox(str);
}

void CEVCTestCOMDlg::OnDestroy() 
{
	CDialog::OnDestroy();

	PurgeComm(hComport, PURGE_TXCLEAR | PURGE_RXCLEAR);
	CloseHandle(hComport);	
}