串口写入成功，读取失败

运行超级terminal或Docklight后，我的程序工作（写入和读取OK）。 但是，如果我从来没有运行过这些，我所有的读取都会失败。

所以我想我必须在我的串口初始化代码中丢失一些东西，但我不知道是什么。 这里是：

串口初始化：

bool CSerialPortDrivenHardware::InitSerialPort(){ m_SerialPort.Config( m_SerialPortConfig ); bool success = ( m_SerialPort.Open( m_SerialPortName ) == TRUE ); if( !success ) Log( LOG_TYPE_ERROR, "CSerialPortDrivenHardware", "InitSerialPort", "Could not establish serial port connection" ); else{ m_SerialPort.SetControlBit( DTR_CONTROL_BIT ); m_SerialPort.SetControlBit( RTS_CONTROL_BIT ); } return success; } 

串口类（相关代码）：

 BOOL CSerialPort::Config( SConfig sConfig ) { if( !m_hFile ) return FALSE; DCB dcb; if ( !::GetCommState( m_hFile, &dcb ) ) { m_dwLastError = ::GetLastError(); return FALSE; } dcb.BaudRate = sConfig.dwBaudRate; dcb.Parity = sConfig.bParity; dcb.StopBits = sConfig.bStopBits; dcb.ByteSize = sConfig.bDataBits; if ( !::SetCommState( m_hFile, &dcb ) ) { m_dwLastError = ::GetLastError(); return FALSE; } ::Sleep(200); return TRUE; } BOOL CSerialPort::Open( LPCSTR cszCOM ) { CHAR sPortName[256] = "\\\\.\\"; strcat_s( sPortName, cszCOM ); m_strPortName = sPortName; if( m_hFile ) return FALSE; m_hFile = ::CreateFile( m_strPortName.c_str(), GENERIC_READ|GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL); if( m_hFile == INVALID_HANDLE_VALUE ) m_hFile = NULL; if( !m_hFile ) return FALSE; SetFlags( 0 ); return TRUE; } void CSerialPort::SetFlags( DWORD dwFlags ) { if( dwFlags & READMODE_BLOCKING ) SetTimeout( INFINITE ); else SetTimeout( 0 ); } void CSerialPort::SetTimeout( DWORD dwTimeout ) { COMMTIMEOUTS sCommTimeouts; if( !::GetCommTimeouts( m_hFile, &sCommTimeouts ) ) { m_dwLastError = ::GetLastError(); return; } sCommTimeouts.ReadIntervalTimeout = 0; sCommTimeouts.ReadTotalTimeoutMultiplier = 0; sCommTimeouts.ReadTotalTimeoutConstant = dwTimeout; if ( !::SetCommTimeouts( m_hFile, &sCommTimeouts ) ) m_dwLastError = ::GetLastError(); } BOOL CSerialPort::SetControlBit( ESerialPortControlBit eControlBit ) { if( !m_hFile ) return FALSE; BOOL bResult = FALSE; switch( eControlBit ) { case DTR_CONTROL_BIT: bResult = ::EscapeCommFunction( m_hFile, SETDTR ); break; case RTS_CONTROL_BIT: bResult = ::EscapeCommFunction( m_hFile, SETRTS ); break; } return bResult; } 

 BOOL CSerialPort::Config( SConfig sConfig ) { if( !m_hFile ) return FALSE; .... 

 BOOL CSerialPort::Open( LPCSTR cszCOM ) { CHAR sPortName[256] = "\\\\.\\"; strcat_s( sPortName, cszCOM ); m_strPortName = sPortName; if( m_hFile ) return FALSE; m_hFile = ::CreateFile( m_strPortName.c_str(), GENERIC_READ|GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL); .....