Pd-dev October 2004

pd-dev@lists.iem.at

32 participants
58 discussions

How compile an external with visual c++ 6.0 ?
by TotoEtLiTiti 15 Oct '04

15 Oct '04

Hello ! I found this document: http://iem.at/pd/externals-HOWTO/HOWTO-externals-en.html But I have few questions... An external is a "win32 Dynamic-link library" or a "win32 static library" ? Must I use MFC (Microsoft Foundation Classes) ? If yes, in shared or in static library ? I tested the "helloworld" from the HOWTO (in "win32 Dynamic-link library", with no MFC), and I can't load my object in PD... I have this error : "load_object: symbol "helloworld_setup" not found helloworld: can't load library" Why ? Where is the error ?!

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more ideas... registering abstractions/externals etc..
by B. Bogart 14 Oct '04

14 Oct '04

hey all, to contextualize this idea I'll take pixelTANGO as my example. In pixelTANGO there is a pt.layerfx that deals with pixel processing. Inside it there are a number of abstractions that each correspond to a particular filter fx/edge.pd or fx/negative.pd These abstractions have a standard interface, gem inlet and outlet and a sigle control inlet to control the amount of effect, from 0-1. The filters are turned and and off by routing the gem-data through spigots. A really usefuly feature for pixelTANGO would be the ability to drop your own patch into fx/ since they have a standard interface. The problem becomes how to register this added effect, and worse yet how to build a dynamic gem chain that changes based on the number of effects in the fx/ folder. Follwing this the popup widget would have to get an updated list of abstractions in fx/ and build its contents dynamically. Beyond those learning PD hacking the contents of a high-level abstraction it would be even more useful if they could create a component of that abstraction using certain API standards, and drop it in without actually having to worry about breaking the abstraction. Even better if the abstraction just uses components sitting in a special folder. Argument here is that its perhaps easier to make the component than to hack the high-level abstraction or than making a new abstraction for what you want to do. Alright thats enough of my creativity for the list. B.

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string external & usage count
by joerg piringer 14 Oct '04

14 Oct '04

hi all, i am trying to develop a string external that does not use symbols for string storage because of known problems with symbols. what i am now doing is using string handles (int) and store the strings internally in my external. that works quite well. the only problem is that i had to introduce usage counters to free my string memory when it is no longer needed. when a string is generated (each operation that returns a string generates a new string) the usage count is set to one and when an object receives a string at one of its inlets the usage count is reduced. if the usage count is zero the string mem is freed. that works as long as i don't split outlets. my objects don't know how many connections are plugged into an outlet so it cannot set the usage count to the number of connections as it should be. so my (not very beautiful) solution is to introduce an object that splits an inlet into multiple outlets and increases the usage counter accordingly. i did not find a possibility to find out the number of connections attached to an outlet and i guess there is no method for that. is that correct? or could maybe future versions of pd make it possible for externals to detect the number of connections? anyway my solution works quite well but i'd like to improve it. best joerg -- http://joerg.piringer.net http://www.transacoustic-research.com http://www.iftaf.org http://www.vegetableorchester.org

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Re: [PD-dev] C++ templates - question
by Georg Holzmann 13 Oct '04

13 Oct '04

Hallo! Okay, everytime I write the question I find the mistake myself :-) I must define the Container Type of course in the base class ! Now everything is working !! (at least with g++!) Thanks again, LG Georg -- GMX ProMail mit bestem Virenschutz http://www.gmx.net/de/go/mail +++ Empfehlung der Redaktion +++ Internet Professionell 10/04 +++

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Re: [PD-dev] C++ templates - question
by Georg Holzmann 13 Oct '04

13 Oct '04

Hallo! Okay, I think the code-organisation problem is solved now. Now it compiles, but I have an other Problem: I use a static map in HMap.h (which is declared in TPDContainerBase.h) and normally I have to define the map in HMap.h like: // define the static member: map<Element,atom,Compare> HMap::data_; But then I get the compiler error: src/HMap.cpp:18: error: ISO C++ does not permit `TPDContainer<std::map<Element, atom, Compare, std::allocator<std::pair<const Element, atom> > >, std::_Rb_tree_iterator<std::pair<const Element, atom>, std::pair<const Element, atom>&, std::pair<const Element, atom>*> >::data_' to be defined as `HMap::data_' And if I don't define it, it compiles but I get an undefined symbol in PD: c++filt _ZN12TPDContainerISt3mapI7Element5_atom7CompareSaISt4pairIKS1_S2_EEESt17_Rb_tree_iteratorIS6_RS6_PS6_EE5data_E TPDContainer<std::map<Element, _atom, Compare, std::allocator<std::pair<Elementconst, _atom> > >, std::_Rb_tree_iterator<std::pair<Element const, _atom>, std::pair<Element const, _atom>&, std::pair<Element const, _atom>*> >::data_ holzi@holzi:~$ c++filt _ZN12TPDContainerISt3mapI7Element5_atom7CompareSaISt4pairIKS1_S2_EEESt17_Rb_tree_iteratorIS6_RS6_PS6_EE5data_E TPDContainer<std::map<Element, _atom, Compare, std::allocator<std::pair<Elementconst, _atom> > >, std::_Rb_tree_iterator<std::pair<Element const, _atom>, std::pair<Element const, _atom>&, std::pair<Element const, _atom>*> >::data_ Has anyone an idea ?? Thanks a lot! LG Georg -- GMX ProMail mit bestem Virenschutz http://www.gmx.net/de/go/mail +++ Empfehlung der Redaktion +++ Internet Professionell 10/04 +++

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Re: [PD-dev] C++ templates - question
by Georg Holzmann 13 Oct '04

13 Oct '04

Hallo! Thomas: > I'm not sure why this happens - i'm using templates all the time, and i find > the easiest solution to write all the implementations inside the class > declaration, like in > > template<class T> > class hula > { > public: > hula(): a(0) {} > T plus(T b) { return a+b; } > private: > T a; > }; OOps, I think the problem was, that I have included the Header file in the source file again, i think I should only include the source file in the header file and don't make an object ! (but I must try it at home !) Thanks for help, LG Georg -- GMX ProMail mit bestem Virenschutz http://www.gmx.net/de/go/mail +++ Empfehlung der Redaktion +++ Internet Professionell 10/04 +++

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Re: [PD-dev] C++ templates - question
by Georg Holzmann 13 Oct '04

13 Oct '04

Thomas Grill schrieb: > are you sure the gcc compiler can handle template code to be compiled in > separate object files? > I would try to include the TPDContainer.cpp into TPDContainer.h, just as for > NT defined. (line 122) I tried this, but then I get all the errors like "redifinition of ..." for each method! But yesterday I rethought the whole design and I think I'll make it without templates, because I don't have much advantages from them anyhow in my case. And then there are no problems with all the compilers ... But thanks for your efforts, LG Georg -- GMX ProMail mit bestem Virenschutz http://www.gmx.net/de/go/mail +++ Empfehlung der Redaktion +++ Internet Professionell 10/04 +++

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C++ templates - question
by Georg Holzmann 12 Oct '04

12 Oct '04

Hi List, hi C++Experts! I have a problem with C++-Templates. I currently try to implement all the C++ STL-Containers and decided to make it with templates, because a lot of them have the same methods. The attached program is only the map (I know it's the same as pool, but there will follow the other containers...). The problem: Everything compiles fine, but in PD: /win/Georg/PD-Externals/PDContainer/h_map.pd_linux: /win/Georg/PD-Externals/PDContainer/h_map.pd_linux: undefined symbol: _ZN12TPDContainerISt3mapI7Element5_atom7CompareSaISt4pairIKS1_S2_EEESt17_Rb_tree_iteratorIS6_RS6_PS6_EE8clearAllEv h_map ... couldn't create a c++filt gives me the method: c++filt _ZN12TPDContainerISt3mapI7Element5_atom7CompareSaISt4pairIKS1_S2_EEESt17_Rb_tree_iteratorIS6_RS6_PS6_EE8clearAllEv TPDContainer<std::map<Element, _atom, Compare, std::allocator<std::pair<Elementconst, _atom> > >, std::_Rb_tree_iterator<std::pair<Element const, _atom>, std::pair<Element const, _atom>&, std::pair<Element const, _atom>*> >::clearAll() This method is in the Base Class TPDContainer and the map (class HMap) should have access to this method! If I override this method directly in class HMap the undifined symbol is in the method from the Base class TPDContainer. Maybe it is a real trivial problem and some C++Expert could point me to it (or maybe the makefile should be modified ?) Thanks for any help, LG Georg -- +++ GMX DSL Premiumtarife 3 Monate gratis* + WLAN-Router 0,- EUR* +++ Clevere DSL-Nutzer wechseln jetzt zu GMX: http://www.gmx.net/de/go/dsl

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Re: [PD-dev] C++ templates - question
by Georg Holzmann 12 Oct '04

12 Oct '04

i forgot an important word: This method is in the Base Class TPDContainer and the map (class HMap) should have access to this method! If I override this method directly in class HMap the undifined symbol is in the _NEXT_ method from the Base class TPDContainer. ^ | (this one) LG Georg -- GMX ProMail mit bestem Virenschutz http://www.gmx.net/de/go/mail +++ Empfehlung der Redaktion +++ Internet Professionell 10/04 +++

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cvs questions
by Thomas Grill 12 Oct '04

12 Oct '04

Hi all, yesterday i was checking in a lot of new SIMD stuff into the devel_0_37, but then i took back the changes because i realized that my editor changed much of the whitespaces in the code which results in lengthy diffs and lots of work for future merging (hi Günther!!). Thus, my question is: Is there a common practice which kind of whitespace treatment should be used for newly created or modified PD source code? I personally use spaces rather than tabs and 4 space indents, which seems quite widespread. The other thing is that i wonder whether the configure file should be in the cvs at all, since it's created from configure.in . all the best, Thomas

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Pd-dev October 2004