Dear Kjell and list ,
Thank you so mush, i wake up now,I wrote the following function as a
signal:
///////////////////////////////////////////////////
bool NetworkSocket::isDataReady()
{
void *buffer;
sockaddr_in from;
socklen_t fromLength = sizeof( from );
if (::recvfrom(this->socketFD,buffer,FRAMEBUFFER + 6, 0, (sockaddr *)&this->getSocketAddressStructureOfServer(), &fromLength ) == -1)
{
if (errno == EAGAIN || errno == EWOULDBLOCK)
return false;
}
return true;
}
/////////////////////////////////////////////////
When in blocking mode data is ready it can notify me that i can read
socket...
Then i wrote a function as slot:
///////////////////////////////////////////////////
int NetworkSocket::readDatagrams(unsigned char *buffer, string
&srcAddress, unsigned short int & srcPort)
{
unsigned int maximumPacketSize = FRAMEBUFFER + 6;
int returnValue ;
sockaddr_in from;
socklen_t fromLength = sizeof( from );
int receivedBytes;
fromLength = sizeof(this->getSocketAddressStructureOfServer());
receivedBytes = recvfrom( this->socketFD, buffer, maximumPacketSize, 0, (sockaddr *)&this->getSocketAddressStructureOfServer(), &fromLength );
returnValue = receivedBytes;
if ( receivedBytes <= 0 )
returnValue = -1;
srcAddress = inet_ntoa(this->getSocketAddressStructureOfServer().sin_addr);
srcPort = ntohs( ( unsigned short int)this->getSocketAddressStructureOfServer().sin_port );
return returnValue;
}
////////////////////////////////////////////////////////
Above functions work fine, Kjell helped and i debug my code that wrote
in asleep,
i define the following 2 lines in class body:
/////////////////////////////
sigc::signal<bool> ready;
void run();
///////////////////////////
the i wrote following code in constructor:
//////////////////////////
this->ready.connect(sigc::mem_fun(*this,&NetworkSocket::createThread));
/////////////////////////////////////////
Question:
But i don't relate my signal (isDataReady()) to createThread
Thank you for attention predictable....
--mohsen
On Wed, 2012-08-01 at 22:36 +0430, Mohsen Pahlevanzadeh wrote:
> Dear Kjell,
> At first Thank you for your reply,
> You woke up me,I was asleep and code, thank you, i need to rest...
>
> --mohsen
> On Wed, 2012-08-01 at 18:53 +0200, Kjell Ahlstedt wrote:
> > 2012-08-01 16:45, Mohsen Pahlevanzadeh skrev:
> > > Dear all,
> > >
> > > I have 2 question: a. about the libsigc b. about (this) word and typeof
> > > or decltype
> > > I have NetworkSocket class and coded in main() func such as the
> > > following:
> > > ///////////////////////////////////
> > > NetworkSocket *oo = new NetworkSocket();
> > > oo->ready.connect(sigc::ptr_fun(&NetworkSocket::createThread));
> > > oo->run();
> > > ///////////////////////////////////////
> > > Above code get the following error:
> > > /////////////////
> > > error: no matching function for call to ‘ptr_fun(bool (NetworkSocket::*)())’
> > > ////////////////
> > >
> > > When i comment the above code , and put the following code in constructor :
> > > //////////////////////////////////////
> > > typeof(this) sig = new NetworkSocket();
> > > sig->ready.connect(sigc::ptr_fun(createThread));
> > > this->run();
> > > ////////////////////////////////////////
> > > I get the following error:
> > > ////////////////////////////////
> > > error: no matching function for call to ‘ptr_fun(<unresolved overloaded function type>)’
> > > ////////////////////////////////
> > > So , i think g++ can't understand type of this reserverd word.And i don't understand no match call function.
> > >
> > > Yours,
> > > Mohsen
> > >
> > Is NetworkSocket::createThread() a static member function? If it's not
> > static, you must use sigc::mem_fun() instead of sigc::ptr_fun().
> >
> > NetworkSocket *oo = new NetworkSocket();
> > oo->ready.connect(sigc::mem_fun(*oo, &NetworkSocket::createThread));
> > oo->run();
> >
> > or
> >
> > typeof(this) sig = new NetworkSocket();
> > sig->ready.connect(sigc::mem_fun(*this, &NetworkSocket::createThread));
> > // or mem_fun(*sig...?
> > this->run();
> >
> > but here you have 2 NetworkSocket objects, *this and *sig. Is that what
> > you want? Should it be
> >
> > ready.connect(sigc::mem_fun(*this, &NetworkSocket::createThread));
> > this->run();
> >
> > What makes you suspect that g++ does not understand typeof(this)? You
> > don't mention any error message that contains 'typeof'.
> >
>
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