Thanks for the example, I'll try tonight! I also started to mockup a simple version, and surprise, it's working...... I'll keep you informed if I find where the problem is.
Cheers ----------------------------------------------- Ahmidou Lyazidi Director | TD | CG artist http://vimeo.com/ahmidou/videos http://www.cappuccino-films.com 2013/6/10 Marc-Andre Belzile <[email protected]> > 1) Assigning buffer to a std::vector (copy data) > > Std::vector v(buffer,buffersize); > > 2) std::vector wrapper (untested) > > struct Wrapper : public std::vector > { > Wrapper( double* buffer,size_t size ) > { > // initialize stl internals with buffer > this->_M_impl _M_start = buffer; > this->_M_impl _M_finish = this->_M_impl _M_end_of_storage = buffer + size; > } > > ~Wrapper() > { > // nulls out internals to avoid deallocation from stl > this->_M_impl _M_start = this->_M_impl _M_finish = > this->_M_impl _M_end_of_storage = NULL; > } > }; > > I think boost have already a similar class, but boost is a big hammer for > such a tiny nail! > > -mab > > > From: [email protected] [mailto: > [email protected]] On Behalf Of Guillaume Laforge > Sent: Monday, June 10, 2013 8:53 AM > To: [email protected] > Subject: Re: [C++] Store a structure of vector in a UserData > > Hi Ahmidou, > > I'm often storing just a pointer to an array/buffer/vector to pass any > struct to a User Data and it is working fine. > It is hard to help you without seeing more chunks of your code :). > Maybe you could try to repro the issue on a simpler code that you could > share here ? > > Cheers, > > Guillaume > > On Mon, Jun 10, 2013 at 4:33 AM, Ahmidou Lyazidi <[email protected] > <mailto:[email protected]>> wrote: > Thanks everyone, unfortunatly I'm still stuck..... > > @ Stephane, this is what I'm doing, but it's not working: > sizeof( test.A ) + sizeof( double ) * test.A.size() + sizeof( test.B ) + > sizeof( double ) * test.B.size() + sizeof( bool ) * 2 > @ Guillame > Thanks, I tryed your example but I'm probably doing it the wrong way: > > Foo Test; > //Set some values > Test.A->pushback(12); > Test.B->pushback(24); > Test.B->pushback(32); > Test.C->pushback(true); > Test.D->pushback(false); > > myMap.PutItemValue( i, (unsigned char*)&Test, sizeof( Foo )) ; > // Get them back > const unsigned char* pInternalData = NULL ; > UINT cntData = 0 ; > myMap.GetItemValue( 0, pInternalData, cntData ) ; > > Foo *pData = (Foo*) pInternalData ; > if(pData) > { > Application().LogMessage("nb "+CString(pData->A->size())); > } > this return empty vector.... > @MAB > Could you point me to some ressources on the web about this? > Thanks!! > > > ----------------------------------------------- > Ahmidou Lyazidi > Director | TD | CG artist > http://vimeo.com/ahmidou/videos > http://www.cappuccino-films.com > > 2013/6/10 Marc-Andre Belzile <[email protected]<mailto: > [email protected]>> > Alternatively, you could store C++ buffers in your struct instead of > std::vector objects. Then if you need to access your data with stl, just > assign each buffer to an std::vector out from these buffers. > > If you can't afford the extra copy performed by std::vector constructor, > you'll need to implement your own wrapper class deriving from std::vector > that nulls out the internal container upon destruction. > This is required to avoid std::vector to deallocate your buffer memory. > > Of course I haven't tested this solution yet but it should work. :) > > -mab > > From: [email protected]<mailto: > [email protected]> [mailto: > [email protected]<mailto: > [email protected]>] On Behalf Of Guillaume Laforge > Sent: Sunday, June 09, 2013 3:29 PM > To: [email protected]<mailto:[email protected] > > > Subject: Re: [C++] Store a structure of vector in a UserData > > Well, if you need the exact number of bytes, you will need to take into > account the size of std::vector objects I think :). > > On Sun, Jun 9, 2013 at 10:07 AM, Stephan Woermann < > [email protected]<mailto:[email protected]><mailto: > [email protected]<mailto:[email protected]>>> wrote: > To get the total size of the struct, this should work: > > Foo test; > sizeof( double ) * test.A.size() + sizeof( double ) * test.B.size() + > sizeof( bool ) * 2 > Stephan > 2013/6/9 Guillaume Laforge <[email protected]<mailto: > [email protected]><mailto:[email protected] > <mailto:[email protected]>>> > Hi Ahmidou :), > > You could try to use pointers to std::vector. This way you will be able to > access those vector and get the double values correctly. > But you must handle the allocation/deallocation of those vectors by > yourself: > > struct Foo{ > std::vector<double> *A; > std::vector<double> *B; > bool C; > bool D; > > Foo() > { > A = new std::vector<double>; > B = new std::vector<double>; > } > ~Foo() > { > delete A; > delete B; > } > }; > > Hope this help, > > Guillaume > On Sun, Jun 9, 2013 at 8:07 AM, Ahmidou Lyazidi <[email protected] > <mailto:[email protected]><mailto:[email protected]<mailto: > [email protected]>>> wrote: > Hi List, > Is it possible to store this kind of struct in a UserData (map or blob): > > struct Foo{ > std::vector<double> A; > std::vector<double> B; > bool C; > bool D; > }; > I can pull out the structure, and the vectors have the good number of > item...but they are empty, the values are gone > > I'm not sure, but I think it's lost because of the size parameter in > UserDataMap.PutItemValue > I tried to set the real size ( sizeof(vector)+ > sizeof(double)*vector::size() ) but this gave me some crazy results. > Any idea? > Thanks > > ----------------------------------------------- > Ahmidou Lyazidi > Director | TD | CG artist > http://vimeo.com/ahmidou/videos > http://www.cappuccino-films.com > > > > >
