// rs485_2Dlg.cpp : 實現文件
//

#include "stdafx.h"
#include "rs485_2.h"
#include "rs485_2Dlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// 用于應用程序“關于”菜單項的 CAboutDlg 對話框

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

// 對話框數據
	enum { IDD = IDD_ABOUTBOX };

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

// 實現
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()


// Crs485_2Dlg 對話框



Crs485_2Dlg::Crs485_2Dlg(CWnd* pParent /*=NULL*/)
	: CDialog(Crs485_2Dlg::IDD, pParent)
	, m_disp(_T(""))
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void Crs485_2Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	DDX_Text(pDX, IDC_EDIT1, m_disp);
}

BEGIN_MESSAGE_MAP(Crs485_2Dlg, CDialog)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
	ON_BN_CLICKED(IDC_send, OnBnClickedsend)
	ON_BN_CLICKED(IDC_receive, OnBnClickedreceive)
	ON_BN_CLICKED(IDCANCEL, OnBnClickedCancel)
	ON_WM_CLOSE()
END_MESSAGE_MAP()


// Crs485_2Dlg 消息處理程序

BOOL Crs485_2Dlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// 將\“關于...\”菜單項添加到系統菜單中。

	// IDM_ABOUTBOX 必須在系統命令范圍內。
	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);
		}
	}

	// 設置此對話框的圖標。當應用程序主窗口不是對話框時，框架將自動
	//  執行此操作
	SetIcon(m_hIcon, TRUE);			// 設置大圖標
	SetIcon(m_hIcon, FALSE);		// 設置小圖標

	// TODO：在此添加額外的初始化代碼
	hCom=CreateFile("COM1",//COM1口
		GENERIC_READ|GENERIC_WRITE, //允許讀和寫
		0, //獨占方式
		NULL,
		OPEN_EXISTING, //打開而不是創建
		FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED, //重疊方式
		NULL);
	if(hCom==(HANDLE)-1)
	{
		AfxMessageBox("打開COM失敗!");
		return FALSE;
	}

	SetupComm(hCom,100,100); //輸入緩沖區和輸出緩沖區的大小都是100

	COMMTIMEOUTS TimeOuts;
	//設定讀超時
	TimeOuts.ReadIntervalTimeout=MAXDWORD;
	TimeOuts.ReadTotalTimeoutMultiplier=0;
	TimeOuts.ReadTotalTimeoutConstant=0;
	//在讀一次輸入緩沖區的內容后讀操作就立即返回，
	//而不管是否讀入了要求的字符。


	//設定寫超時
	TimeOuts.WriteTotalTimeoutMultiplier=100;
	TimeOuts.WriteTotalTimeoutConstant=500;
	SetCommTimeouts(hCom,&TimeOuts); //設置超時

	DCB dcb;
	GetCommState(hCom,&dcb);
	dcb.BaudRate=19200; //波特率為9600
	dcb.ByteSize=8; //每個字節有8位
	dcb.Parity=NOPARITY; //無奇偶校驗位
	dcb.StopBits=TWOSTOPBITS; //兩個停止位
	SetCommState(hCom,&dcb);

	PurgeComm(hCom,PURGE_TXCLEAR|PURGE_RXCLEAR);

	return TRUE;  // 除非設置了控件的焦點，否則返回 TRUE
}

void Crs485_2Dlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// 如果向對話框添加最小化按鈕，則需要下面的代碼
//  來繪制該圖標。對于使用文檔/視圖模型的 MFC 應用程序，
//  這將由框架自動完成。

void Crs485_2Dlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // 用于繪制的設備上下文

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

		// 使圖標在工作矩形中居中
		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;

		// 繪制圖標
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

//當用戶拖動最小化窗口時系統調用此函數取得光標顯示。
HCURSOR Crs485_2Dlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}

void Crs485_2Dlg::OnBnClickedsend()
{
	// TODO: 在此添加控件通知處理程序代碼
	OVERLAPPED m_osWrite;
	memset(&m_osWrite,0,sizeof(OVERLAPPED));
	m_osWrite.hEvent=CreateEvent(NULL,TRUE,FALSE,NULL);


	char lpOutBuffer[7];
	memset(lpOutBuffer,'\0',7);
	lpOutBuffer[0]='\x11';
	lpOutBuffer[1]='0';
	lpOutBuffer[2]='0';
	lpOutBuffer[3]='1';
	lpOutBuffer[4]='0';
	lpOutBuffer[5]='1';
	lpOutBuffer[6]='\x03';
	
	DWORD dwBytesWrite=7;
	COMSTAT ComStat;
	DWORD dwErrorFlags;
	BOOL bWriteStat;
	ClearCommError(hCom,&dwErrorFlags,&ComStat);
	bWriteStat=WriteFile(hCom,lpOutBuffer,
		dwBytesWrite,& dwBytesWrite,&m_osWrite);

	if(!bWriteStat)
	{
		if(GetLastError()==ERROR_IO_PENDING)
		{
			WaitForSingleObject(m_osWrite.hEvent,1000);
		}
	}

}

void Crs485_2Dlg::OnBnClickedreceive()
{
	// TODO: 在此添加控件通知處理程序代碼
	OVERLAPPED m_osRead;
	memset(&m_osRead,0,sizeof(OVERLAPPED));
	m_osRead.hEvent=CreateEvent(NULL,TRUE,FALSE,NULL);

	COMSTAT ComStat;
	DWORD dwErrorFlags;
	
	char str[100];
	memset(str,'\0',100);
	DWORD dwBytesRead=100;//讀取的字節數
	BOOL bReadStat;

	ClearCommError(hCom,&dwErrorFlags,&ComStat);
	dwBytesRead=min(dwBytesRead, (DWORD)ComStat.cbInQue);
	bReadStat=ReadFile(hCom,str,
		dwBytesRead,&dwBytesRead,&m_osRead);
	if(!bReadStat)
	{
		if(GetLastError()==ERROR_IO_PENDING)
	    //GetLastError()函數返回ERROR_IO_PENDING,表明串口正在進行讀操作
		{
			WaitForSingleObject(m_osRead.hEvent,2000);
		    //使用WaitForSingleObject函數等待，直到讀操作完成或延時已達到2秒鐘
		    //當串口讀操作進行完畢后，m_osRead的hEvent事件會變為有信號
		}
	}

	PurgeComm(hCom, PURGE_TXABORT|
		PURGE_RXABORT|PURGE_TXCLEAR|PURGE_RXCLEAR);
	m_disp=str;
	UpdateData(FALSE);

}

void Crs485_2Dlg::OnBnClickedCancel()
{
	// TODO: 在此添加控件通知處理程序代碼
	
	OnCancel();
}

void Crs485_2Dlg::OnClose()
{
	// TODO: 在此添加消息處理程序代碼和/或調用默認值
	CloseHandle(hCom);
	CDialog::OnClose();
}