How to transfer file through serial communication

[shamik]

hii friends,

i am using Qt3 which comes bydefault with FC-6 installation.
i want to transfer files like zip, pdf, jpeg etc through serial communication (i.e. using com port)

can anyone please tell me how can i achieve this?!?
if possible please provide me with a sample code.

[wysota]

Please start by searching the forum.

[shamik]

i've downloaded the QExtSerialPort1.1 from the net

in this when i go to the /example/ folder and type "make" to compile everything
it gives following error :

make
make: Warning: File `Makefile' has modification time 2.3e+08 s in the
future
g++ -c -pipe -Wall -W -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2
-fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32
-march=i386 -mtune=generic -fasynchronous-unwind-tables -D_REENTRANT
-D_TTY_POSIX_ -DQT_NO_DEBUG -DQT_THREAD_SUPPORT -DQT_SHARED
-I/usr/lib/qt-3.3/mkspecs/default -I. -I../.. -I/usr/lib/qt-3.3/include
-Iuic/ -Imoc/ -o obj/main.o main.cpp
main.cpp:8:28: error: qextserialport.h: No such file or directory
In file included from main.cpp:12:
MessageWindow.h:12:25: error: qdockwidget.h: No such file or directory
MessageWindow.h:20: error: expected class-name before ‘{’ token
MessageWindow.h:20: warning: ‘class MessageWindow’ has virtual functions
but non-virtual destructor
make: *** [obj/main.o] Error 1

can anybody please help me with this ?

[wysota]

main.cpp:8:28: error: qextserialport.h: No such file or directory

This seems obvious - the file is missing.

MessageWindow.h:12:25: error: qdockwidget.h: No such file or directory

This suggest you've downloaded the wrong release as QDockWidget is part of Qt4 and not Qt3.

[freeskydiver]

...
MessageWindow.h:12:25: error: qdockwidget.h: No such file or directory
can anybody please help me with this ?

Look to the file. If it exists? Then look for QTDIR.

[shamik]

u're right......i had downloaded a wrong package

now i have downloaded a correct one which works with Qt3. The make command has generated the libraries well.

but i dont know how to use this class and its functions.

all the function i found deals with byte transfer i.e. getch(), putch() etc.

but i want to transfer and recieve files like zip, pdf etc.

i cant find any such functions directly sending and recieving files...

can any1 plz suggest

[wysota]

Use getch or putch in a loop.

[shamik]

suppose its a zip file stored somewhere like /root/xp.zip

then how to use that getch() and putch() ??

[wysota]

Oh come on.... What kind of a question is that?
Open the file, read characters and transmit them over the serial line. You'll probably need some protocol of communication to transfer the file length and file name. You can probably use QDataStream to ease your task.

[high_flyer]

no need to use getch().
Just use readBytes() and you don't need a loop.
But the rest is the same as wysota said.

[steg90]

Hi,

Plenty of serial comms classes on the web...

Personally, I use my own I wrote which is for windows, if it is for windows you want to use serial comms, just use api calls such as ::CreateFile, ::WriteFile etc...

Here is some code from my serial class, may help ( this is for Windows )?

template<class T=char, int nSize=100> class CSerialComms  
{
public:
	T& operator[]( int nIndex ) { return m_buf[nIndex]; }
 
	CSerialComms& operator=( const CSerialComms& r ) 
	{
		memcpy( m_buf, r.m_buf, nSize );
		m_cto = r.m_cto;
		m_dcb = r.m_dcb;
		m_hFile = r.m_hFile;
		return *this;
	}
 
 
	inline int SetTimeouts( DWORD dwReadInterval = 1, DWORD dwReadTotalTimeout = 100, DWORD dwReadTotalTimeoutConstant = 1000, DWORD dwWriteTotalTimeout = 0, DWORD dwWriteTotalTimeoutConstant = 0 )
	{
		int nError = SUCCESS;
		m_cto.ReadIntervalTimeout = dwReadInterval;
		m_cto.ReadTotalTimeoutMultiplier = dwReadTotalTimeout;
		m_cto.ReadTotalTimeoutConstant = dwReadTotalTimeoutConstant;
		m_cto.WriteTotalTimeoutMultiplier = dwWriteTotalTimeout;
		m_cto.WriteTotalTimeoutConstant = dwWriteTotalTimeoutConstant;
		if( !::SetCommTimeouts( m_hFile, &m_cto) )
		{
			nError = GetLastError();
		}
		return nError;
	}
 
	inline int OpenPort( LPCTSTR szPort = "COM1" )
	{
		int nError = SUCCESS;
		m_hFile = ::CreateFile( szPort, GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL);
		if( m_hFile == INVALID_HANDLE_VALUE )
		{
			nError = GetLastError();
		}
		return nError;
	}
 
	inline int SetCommsDevice( DWORD dwBaud = 57600, BYTE iParity = NOPARITY, BYTE iStopBits = ONESTOPBIT, BYTE iByteSize = 8 )
	{
		int nError = SUCCESS;
		memset( &m_dcb, 0, sizeof( m_dcb ) );
		m_dcb.DCBlength = sizeof( m_dcb );
		m_dcb.BaudRate = dwBaud;
		m_dcb.Parity = iParity;
		m_dcb.StopBits = iStopBits;
		m_dcb.ByteSize = iByteSize;
 
		if( !::SetCommState( m_hFile, &m_dcb ) )
		{
			nError = GetLastError();
		}
		return nError;
	}
 
	DWORD TxData( T* szBuf )
	{
		DWORD nowrote = 0;
		memset( m_buf, 0, sizeof( m_buf ) );
		if( sizeof( m_buf ) >= strlen( szBuf ) )   // check to see if buffer allocated is big enough
		{
			memcpy( &m_buf[1], szBuf, strlen( szBuf ) );
			m_buf[0] = 0x2;
			m_buf[ strlen(szBuf) + 1 ] = 0x3;
			return TxData();
		}
		return BUFFEROVERFLOW;
	}
 
	DWORD TxData()
	{
		DWORD nowrote = 0;
		::WriteFile( m_hFile, m_buf, strlen(m_buf), &nowrote, NULL ); 
		return nowrote;
	}
 
	CSerialComms( void ){ memset( m_buf, 0, nSize ); };
	~CSerialComms(){};
 
 
private:
	T				m_buf[nSize];
	COMMTIMEOUTS	m_cto;
	DCB				m_dcb;
	HANDLE			m_hFile;
 
	enum { FAILED = 0, SUCCESS = 1, BUFFEROVERFLOW = 2  };
};
 
#endif // !defined(AFX_SERIALCOMMS_H__BA76EBFF_6F02_4E79_BC65_DD4C2655354B__INCLUDED_)

template<class T=char, int nSize=100> class CSerialComms  
{
public:
	T& operator[]( int nIndex ) { return m_buf[nIndex]; }

	CSerialComms& operator=( const CSerialComms& r ) 
	{
		memcpy( m_buf, r.m_buf, nSize );
		m_cto = r.m_cto;
		m_dcb = r.m_dcb;
		m_hFile = r.m_hFile;
		return *this;
	}

	
	inline int SetTimeouts( DWORD dwReadInterval = 1, DWORD dwReadTotalTimeout = 100, DWORD dwReadTotalTimeoutConstant = 1000, DWORD dwWriteTotalTimeout = 0, DWORD dwWriteTotalTimeoutConstant = 0 )
	{
		int nError = SUCCESS;
		m_cto.ReadIntervalTimeout = dwReadInterval;
		m_cto.ReadTotalTimeoutMultiplier = dwReadTotalTimeout;
		m_cto.ReadTotalTimeoutConstant = dwReadTotalTimeoutConstant;
		m_cto.WriteTotalTimeoutMultiplier = dwWriteTotalTimeout;
		m_cto.WriteTotalTimeoutConstant = dwWriteTotalTimeoutConstant;
		if( !::SetCommTimeouts( m_hFile, &m_cto) )
		{
			nError = GetLastError();
		}
		return nError;
	}

	inline int OpenPort( LPCTSTR szPort = "COM1" )
	{
		int nError = SUCCESS;
		m_hFile = ::CreateFile( szPort, GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL);
		if( m_hFile == INVALID_HANDLE_VALUE )
		{
			nError = GetLastError();
		}
		return nError;
	}

	inline int SetCommsDevice( DWORD dwBaud = 57600, BYTE iParity = NOPARITY, BYTE iStopBits = ONESTOPBIT, BYTE iByteSize = 8 )
	{
		int nError = SUCCESS;
		memset( &m_dcb, 0, sizeof( m_dcb ) );
		m_dcb.DCBlength = sizeof( m_dcb );
		m_dcb.BaudRate = dwBaud;
		m_dcb.Parity = iParity;
		m_dcb.StopBits = iStopBits;
		m_dcb.ByteSize = iByteSize;

		if( !::SetCommState( m_hFile, &m_dcb ) )
		{
			nError = GetLastError();
		}
		return nError;
	}

	DWORD TxData( T* szBuf )
	{
		DWORD nowrote = 0;
		memset( m_buf, 0, sizeof( m_buf ) );
		if( sizeof( m_buf ) >= strlen( szBuf ) )   // check to see if buffer allocated is big enough
		{
			memcpy( &m_buf[1], szBuf, strlen( szBuf ) );
			m_buf[0] = 0x2;
			m_buf[ strlen(szBuf) + 1 ] = 0x3;
			return TxData();
		}
		return BUFFEROVERFLOW;
	}

	DWORD TxData()
	{
		DWORD nowrote = 0;
		::WriteFile( m_hFile, m_buf, strlen(m_buf), &nowrote, NULL ); 
		return nowrote;
	}
	
	CSerialComms( void ){ memset( m_buf, 0, nSize ); };
	~CSerialComms(){};


private:
	T				m_buf[nSize];
	COMMTIMEOUTS	m_cto;
	DCB				m_dcb;
	HANDLE			m_hFile;

	enum { FAILED = 0, SUCCESS = 1, BUFFEROVERFLOW = 2  };
};

#endif // !defined(AFX_SERIALCOMMS_H__BA76EBFF_6F02_4E79_BC65_DD4C2655354B__INCLUDED_)

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Regards,
Steve

[high_flyer]

Plenty of serial comms classes on the web...

True, but QextSerialPort is based on QIODevice and therefore integrates well withe Qt Stream classes, and you can sublass it and add signals and slots to it (if you need such a thing, I didn't so far)
And ofcourse, QextSerialPort is cross platform!