comm.cpp

可以找到串口,可以写MTK手机的IMEI

#include "stdafx.h"
#include "Comm.h"

// 串口设备句柄
/*HANDLE hComm;

// 打开串口
// 输入: pPort - 串口名称或设备路径，可用"COM1"或"\\.\COM1"两种方式，建议用后者
//       nBaudRate - 波特率
//       nParity - 奇偶校验
//       nByteSize - 数据字节宽度
//       nStopBits - 停止位
BOOL OpenComm(const char* pPort, int nBaudRate, int nParity, int nByteSize, int nStopBits)
{
	DCB dcb;		// 串口控制块
	COMMTIMEOUTS timeouts = {	// 串口超时控制参数
		1,				// 读字符间隔超时时间: 100 ms
		1,					// 读操作时每字符的时间: 1 ms (n个字符总共为n ms)
		10,				// 基本的(额外的)读超时时间: 500 ms
		5,					// 写操作时每字符的时间: 1 ms (n个字符总共为n ms)
		10};				// 基本的(额外的)写超时时间: 100 ms

	hComm = CreateFile(pPort,	// 串口名称或设备路径
			GENERIC_READ | GENERIC_WRITE,	// 读写方式
			0,				// 共享方式：独占
			NULL,			// 默认的安全描述符
			OPEN_EXISTING,	// 创建方式
			0,				// 不需设置文件属性
			NULL);			// 不需参照模板文件
	
	if(hComm == INVALID_HANDLE_VALUE) return FALSE;		// 打开串口失败

	GetCommState(hComm, &dcb);		// 取DCB

	dcb.BaudRate = nBaudRate;
	dcb.ByteSize = nByteSize;
	dcb.Parity = nParity;
	dcb.StopBits = nStopBits;

	SetCommState(hComm, &dcb);		// 设置DCB

	SetupComm(hComm, 4096, 1024);	// 设置输入输出缓冲区大小

	SetCommTimeouts(hComm, &timeouts);	// 设置超时

	return TRUE;
}

// 关闭串口
BOOL CloseComm()
{
	return CloseHandle(hComm);
}

// 写串口
// 输入: pData - 待写的数据缓冲区指针
//       nLength - 待写的数据长度
// 返回: 实际写入的数据长度
int WriteComm(void* pData, int nLength)
{
	DWORD dwNumWrite;	// 串口发出的数据长度

	WriteFile(hComm, pData, (DWORD)nLength, &dwNumWrite, NULL);

	return (int)dwNumWrite;
}

// 读串口
// 输入: pData - 待读的数据缓冲区指针
//       nLength - 待读的最大数据长度
// 返回: 实际读出的数据长度
int ReadComm(void* pData, int nLength)
{
	DWORD dwNumRead;	// 串口收到的数据长度

	ReadFile(hComm, pData, (DWORD)nLength, &dwNumRead, NULL);
	
	return (int)dwNumRead;
}*/
CComm::CComm()
{

	memset( &m_OverlappedRead, 0, sizeof( OVERLAPPED ) );
 	memset( &m_OverlappedWrite, 0, sizeof( OVERLAPPED ) );
	m_hIDComDev = NULL;
	m_bOpened = FALSE;

}

CComm::~CComm()
{

	Close();

}

BOOL CComm::Open( int nPort, int nBaud )
{

	if( m_bOpened ) return( TRUE );

	char szPort[15];
	char szComParams[50];
	DCB dcb;

	wsprintf( szPort, "COM%d", nPort );
	m_hIDComDev = CreateFile( szPort, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL );
	if( m_hIDComDev == NULL ) return( FALSE );

	memset( &m_OverlappedRead, 0, sizeof( OVERLAPPED ) );
 	memset( &m_OverlappedWrite, 0, sizeof( OVERLAPPED ) );

	COMMTIMEOUTS CommTimeOuts;
	CommTimeOuts.ReadIntervalTimeout = 0xFFFFFFFF;
	CommTimeOuts.ReadTotalTimeoutMultiplier = 100;
	CommTimeOuts.ReadTotalTimeoutConstant = 50;
	CommTimeOuts.WriteTotalTimeoutMultiplier = 100;
	CommTimeOuts.WriteTotalTimeoutConstant = 50000;
	SetCommTimeouts( m_hIDComDev, &CommTimeOuts );

	wsprintf( szComParams, "\\\\.\\COM%d:%d,n,8,1", nPort, nBaud );

	m_OverlappedRead.hEvent = CreateEvent( NULL, TRUE, FALSE, NULL );
	m_OverlappedWrite.hEvent = CreateEvent( NULL, TRUE, FALSE, NULL );

	dcb.DCBlength = sizeof( DCB );
	GetCommState( m_hIDComDev, &dcb );
	dcb.BaudRate = nBaud;
	dcb.ByteSize = 8;
	unsigned char ucSet;
	ucSet = (unsigned char) ( ( FC_RTSCTS & FC_DTRDSR ) != 0 );
	ucSet = (unsigned char) ( ( FC_RTSCTS & FC_RTSCTS ) != 0 );
	ucSet = (unsigned char) ( ( FC_RTSCTS & FC_XONXOFF ) != 0 );
	if( !SetCommState( m_hIDComDev, &dcb ) ||
		!SetupComm( m_hIDComDev, 10000, 10000 ) ||
		m_OverlappedRead.hEvent == NULL ||
		m_OverlappedWrite.hEvent == NULL ){
		DWORD dwError = GetLastError();
		if( m_OverlappedRead.hEvent != NULL ) CloseHandle( m_OverlappedRead.hEvent );
		if( m_OverlappedWrite.hEvent != NULL ) CloseHandle( m_OverlappedWrite.hEvent );
		CloseHandle( m_hIDComDev );
		return( FALSE );
		}

	m_bOpened = TRUE;

	return( m_bOpened );

}

BOOL CComm::Close( void )
{

	if( !m_bOpened || m_hIDComDev == NULL ) return( TRUE );

	if( m_OverlappedRead.hEvent != NULL ) CloseHandle( m_OverlappedRead.hEvent );
	if( m_OverlappedWrite.hEvent != NULL ) CloseHandle( m_OverlappedWrite.hEvent );
	CloseHandle( m_hIDComDev );
	m_bOpened = FALSE;
	m_hIDComDev = NULL;

	return( TRUE );

}

BOOL CComm::WriteCommByte( unsigned char ucByte )
{
	BOOL bWriteStat;
	DWORD dwBytesWritten;

	bWriteStat = WriteFile( m_hIDComDev, (LPSTR) &ucByte, 1, &dwBytesWritten, &m_OverlappedWrite );
	if( !bWriteStat && ( GetLastError() == ERROR_IO_PENDING ) ){
		if( WaitForSingleObject( m_OverlappedWrite.hEvent, 1000 ) ) dwBytesWritten = 0;
		else{
			GetOverlappedResult( m_hIDComDev, &m_OverlappedWrite, &dwBytesWritten, FALSE );
			m_OverlappedWrite.Offset += dwBytesWritten;
			}
		}

	return( TRUE );

}

int CComm::SendData( const char *buffer, int size )
{

	if( !m_bOpened || m_hIDComDev == NULL ) return( 0 );

	DWORD dwBytesWritten = 0;
	int i;
	for( i=0; i<size; i++ ){
		WriteCommByte( buffer[i] );
		dwBytesWritten++;
		}

	return( (int) dwBytesWritten );

}

int CComm::ReadDataWaiting( void )
{

	if( !m_bOpened || m_hIDComDev == NULL ) return( 0 );

	DWORD dwErrorFlags;
	COMSTAT ComStat;

	ClearCommError( m_hIDComDev, &dwErrorFlags, &ComStat );

	return( (int) ComStat.cbInQue );

}

int CComm::ReadData( void *buffer, int limit )
{

	if( !m_bOpened || m_hIDComDev == NULL ) return( 0 );

	BOOL bReadStatus;
	DWORD dwBytesRead, dwErrorFlags;
	COMSTAT ComStat;

	ClearCommError( m_hIDComDev, &dwErrorFlags, &ComStat );
	if( !ComStat.cbInQue ) return( 0 );

	dwBytesRead = (DWORD) ComStat.cbInQue;
	if( limit < (int) dwBytesRead ) dwBytesRead = (DWORD) limit;

	bReadStatus = ReadFile( m_hIDComDev, buffer, dwBytesRead, &dwBytesRead, &m_OverlappedRead );
	if( !bReadStatus ){
		if( GetLastError() == ERROR_IO_PENDING ){
			WaitForSingleObject( m_OverlappedRead.hEvent, 2000 );
			return( (int) dwBytesRead );
			}
		return( 0 );
		}

	return( (int) dwBytesRead );

}