comport.cpp

通过使机器人进行简单的图像识别

#include "stdafx.h"
#include "ComPort.h"

CComPort::CComPort()
: m_hPort(INVALID_HANDLE_VALUE)
{

}

CComPort::~CComPort()
{
	ClosePort();
}

// 初始化端口
bool CComPort::OpenPort(void)
{
	ClosePort();

	m_hPort = CreateFile("COM1",
		GENERIC_READ | GENERIC_WRITE,
		0,    // exclusive access 
		NULL, // no security attributes 
		OPEN_EXISTING,
		FILE_ATTRIBUTE_NORMAL,  //同步I/O
		NULL
	);

	if(m_hPort == INVALID_HANDLE_VALUE)
		return false;

	SetupComm(m_hPort, 1024, 512);

	DCB dcb;
	if (!GetCommState(m_hPort, &dcb))
	{
		ClosePort();
		return false;
	}

	//设置COM1
	dcb.BaudRate = CBR_4800;     // set the baud rate
	dcb.ByteSize = 8;            // data size, xmit, and rcv
	dcb.Parity = NOPARITY;       // no parity bit
	dcb.StopBits = ONESTOPBIT;   // one stop bit
	
	if (!SetCommState(m_hPort, &dcb))
	{
		ClosePort();
		return false;
	}

	return true;
}

// 关闭端口
void CComPort::ClosePort(void)
{
	if (INVALID_HANDLE_VALUE != m_hPort)
		CloseHandle(m_hPort);
	m_hPort= INVALID_HANDLE_VALUE;
}

// 发送缓冲区的数据
bool CComPort::SendBytes(const char *pBuf, unsigned int size)
{
	DWORD wsize= 0;
	if ((m_hPort != INVALID_HANDLE_VALUE) && (WriteFile(m_hPort, pBuf, size, &wsize, NULL)))
		return true;
	else
		return false;
}

// 接收数据,返回接收字节数
int CComPort::Recive(char *pBuf, unsigned int size)
{
	DWORD wsize= 0;
	if ((m_hPort != INVALID_HANDLE_VALUE))
	{
		COMSTAT		state;
		DWORD		errors;
		ClearCommError(m_hPort, &errors, &state);
		if ((state.cbInQue > 0) && (ReadFile(m_hPort, pBuf, size, &wsize, NULL)))
		{
			return wsize;
		}
		else
			return 0;
	}
	else
		return 0;
}