mycomdlg.cpp

串口通信程序设置

// mycomDlg.cpp : implementation file
//

#include "stdafx.h"
#include "mycom.h"
#include "mycomDlg.h"

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

#define INBUF_SIZE          10
#define OUTBUF_SIZE         10

char szReadBuffer[INBUF_SIZE];
char szWriteBuffer[OUTBUF_SIZE];

HANDLE hCom; //准备打开的串口的句柄 
HANDLE hCommWatchThread; //辅助线程的全局函数


#define WM_SHOW_RECV_DATA   WM_USER+100

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

DWORD WINAPI ReciveProc(HWND hSendWnd);


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()

/////////////////////////////////////////////////////////////////////////////
// CMycomDlg dialog

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


void CMycomDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CMycomDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CMycomDlg, CDialog)
	//{{AFX_MSG_MAP(CMycomDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_MESSAGE(WM_SHOW_RECV_DATA, OnShowData)
	ON_BN_CLICKED(IDC_BUTTON_RECV, OnButtonRecv)
	ON_BN_CLICKED(IDC_BUTTON_SEND, OnButtonSend)
	ON_BN_CLICKED(IDC_CHECK_HEXDECIMAL, OnCheckHexdecimal)
	ON_CBN_SELCHANGE(IDC_COMBO_BAUTRATE, OnSelchangeComboBautrate)
	ON_CBN_SELCHANGE(IDC_COMBO_BYTESIZE, OnSelchangeComboBytesize)
	ON_CBN_SELCHANGE(IDC_COMBO_STOPBIT, OnSelchangeComboStopbit)
	ON_WM_CLOSE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMycomDlg message handlers

BOOL CMycomDlg::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 
	CComboBox *pComBox;

	pComBox = (CComboBox*)GetDlgItem(IDC_COMBO_BAUTRATE);
	pComBox->ResetContent();
	pComBox->InsertString(0,"110");
	pComBox->InsertString(1,"300");
    pComBox->InsertString(2,"600");
	pComBox->InsertString(3,"1200");
    pComBox->InsertString(4,"2400");
	pComBox->InsertString(5,"4800");
    pComBox->InsertString(6,"9600");
	pComBox->InsertString(7,"14400");
    pComBox->InsertString(8,"19200");
	pComBox->InsertString(9,"38400");
    pComBox->InsertString(10,"57600");
	pComBox->InsertString(11,"115200");
	pComBox->InsertString(12,"128000");
    pComBox->InsertString(13,"256000");
    pComBox->SetCurSel(6);

    pComBox = (CComboBox*)GetDlgItem(IDC_COMBO_STOPBIT);
    pComBox->ResetContent();
	pComBox->InsertString(0,"1");
	pComBox->InsertString(1,"1.5");
	pComBox->InsertString(2,"2");
    pComBox->SetCurSel(0);


	pComBox = (CComboBox*)GetDlgItem(IDC_COMBO_BYTESIZE);
	pComBox->ResetContent();
	pComBox->AddString("8");
    pComBox->SetCurSel(0);


	//得到串口句柄
	hCom = GetCommHandle(_T("COM1"));
	ASSERT(hCom != INVALID_HANDLE_VALUE);
    
	//设置串口
	SetDCB(hCom,9600,1,8);	
    InitCom(hCom);

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

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

void CMycomDlg::SetDCB(HANDLE hCom, DWORD bautRate, UINT stopBit, UINT byteSize)
{

	DCB dcb;
	BOOL bSuccess;
	memset(&dcb,0,sizeof(DCB));
    dcb.DCBlength = sizeof(DCB);
    bSuccess = GetCommState(hCom, &dcb);
	
	if(!bSuccess)
	{
		AfxMessageBox("can't get Com state!");
		return;
	}

    dcb.BaudRate = bautRate;
	dcb.ByteSize = byteSize;   // data size, xmit, and rcv
	dcb.Parity = NOPARITY;     // no parity bit

	if(stopBit == 1)
	{
		dcb.StopBits = ONESTOPBIT; // one stop bit
	}
	else if(stopBit == 2)
	{
        dcb.StopBits = ONE5STOPBITS;//1.5 stop bit
	}
	else 
	{
        dcb.StopBits = TWOSTOPBITS;//two stop bit
	}
	
	bSuccess = SetCommState(hCom, &dcb);

    if(bSuccess)
	{
	   //AfxMessageBox("初始化设置成功!");
	}
    
}

HANDLE CMycomDlg::GetCommHandle(TCHAR *pcCommPort)
{
	HANDLE hCom;
	hCom = INVALID_HANDLE_VALUE;
	hCom = CreateFile(pcCommPort,
                    GENERIC_READ | GENERIC_WRITE,
                    0,    // must be opened with exclusive-access
                    NULL, // default security attributes
                    OPEN_EXISTING, // must use OPEN_EXISTING
                    FILE_FLAG_OVERLAPPED,//overlapped I/O
                    NULL);  // hTemplate must be NULL for comm devices
    return hCom;
}

void CMycomDlg::InitCom(HANDLE hCom)
{
	
	ASSERT(hCom!=INVALID_HANDLE_VALUE); 

	SetCommMask(hCom, EV_RXCHAR|EV_TXEMPTY );//设置事件驱动的类型 

	SetupComm(hCom,INBUF_SIZE,OUTBUF_SIZE); //设置输入、输出缓冲区的大小 

	PurgeComm(hCom, PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR 
		 | PURGE_RXCLEAR);//清干净输入、输出缓冲区 

	COMMTIMEOUTS commTimeOuts;//定义超时结构，并填写该结构 
	commTimeOuts.ReadIntervalTimeout = 0; //interval time-outs are not used
	commTimeOuts.ReadTotalTimeoutConstant = 0;
	commTimeOuts.ReadTotalTimeoutMultiplier = 0;
	commTimeOuts.WriteTotalTimeoutConstant = 0;
	commTimeOuts.WriteTotalTimeoutMultiplier = 0;
	SetCommTimeouts(hCom, &commTimeOuts);//设置读写操作所允许的超时 

}

DWORD WINAPI ReciveProc(HWND hSendWnd)
{
	DWORD dwEvtMask=0;
	OVERLAPPED overlapped;
	memset(&overlapped, 0, sizeof(OVERLAPPED));
	WaitCommEvent( hCom, &dwEvtMask,&overlapped);//等待串口通信事件的发生 

    //检测返回的dwEvtMask，知道发生了什么串口事件
	if ((dwEvtMask & EV_RXCHAR) == EV_RXCHAR)
	{
	
		COMSTAT ComStat;
		DWORD dwLength,dwBytesRead,dwErrorFlags; 

		ClearCommError(hCom, &dwErrorFlags, &ComStat);
		dwLength = ComStat.cbInQue;//输入缓冲区有多少数据
		if(dwLength > 0)
		{
		  
			//Recv(hCom,szWriteBuffer,dwLength,dwBytesRead);
            BOOL bReadStat;
			bReadStat = ReadFile(hCom, //串口句柄
				szReadBuffer,//
				dwLength, //读最大数目
				&dwBytesRead,//实际读得的数目
				&overlapped);//
		
	
			if(!bReadStat)		
			{	
				if(GetLastError() == ERROR_IO_PENDING)			
				{	
					while(!GetOverlappedResult(hCom,
						&overlapped,
						&dwBytesRead, TRUE));//
				}
			}
			//通知主线程，串口收到数据
			::PostMessage((HWND)hSendWnd,WM_SHOW_RECV_DATA,0,0);
			
		}

	}
	CloseHandle(hCommWatchThread);
	return 1;
}

void CMycomDlg::Send(HANDLE hCom,char *szWriteBuffer,DWORD dwBytesToWrite,DWORD dwBytesWritten)
{

	BOOL bWriteStat;//
    OVERLAPPED overlapped;
	memset(&overlapped, 0, sizeof(OVERLAPPED));
    
	bWriteStat = WriteFile(hCom, szWriteBuffer, dwBytesToWrite,
		             &dwBytesWritten,
                     &overlapped); 
	if (!bWriteStat)
	{

		if(GetLastError() == ERROR_IO_PENDING)
		{
		
			while(!GetOverlappedResult(hCom,//
				&overlapped,//
				&dwBytesWritten,//
                TRUE));//
		}
	}

}