When you need help with PlDoc (SWI-Prolog documentation), e.g. writing declaration headers, creating output, etc.
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## [How to generate full doc files of a project?](https://swi-prolog.discourse.group/t/how-to-generate-full-doc-files-of-a-project/9831)
I tried using doc\_save(., \[\]), but it does not generate separate pages for predicates, while still generating the respective hrefs in index.html. Suppose I have a prolog file test.pl I want to have a documentation for, …
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## [How to use swipl within my C++ program?](https://swi-prolog.discourse.group/t/how-to-use-swipl-within-my-c-program/9620)
I compiled and built swipl-devel in this way: raphy@raphy:~$ git clone --recursive https://github.com/SWI-Prolog/swipl-devel.git raphy@raphy:~/swipl-devel$ cmake -DCMAKE\_INSTALL\_PREFIX=/home/raphy/MyPrj/src/swipl-deve…
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## [Can't create a file](https://swi-prolog.discourse.group/t/cant-create-a-file/9531)
Hi, it’s my first day with prolog because im studying IT, i have to create a file in prolog but on my computer i can’t. Only i get that message, and when i click to create file it automatically crash.
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## [XPCE, Boîte de Dialog](https://swi-prolog.discourse.group/t/xpce-boite-de-dialog/9363)
Bonjour, peut-être ai-je négligé une option de configuration, mais je ne parviens pas à obtenir la boîte de dialog telle que présentée par le manuel de XPCE (commande manpce. sous le prompt Prolog ou en cliquant su…
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## [Random number generation, seeds, and GMP](https://swi-prolog.discourse.group/t/random-number-generation-seeds-and-gmp/9317)
Is the claim in the documentation to getrand/1 and setrand/1 still correct? It says, Errors - existence\_error(random\_state, \_) is raised if the underlying infrastructure cannot fetch the random state. This is currentl…
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## [Is the documentation of library(heaps) confusing?](https://swi-prolog.discourse.group/t/is-the-documentation-of-library-heaps-confusing/9259)
Maybe it is just me. I think the underlying reason is the generous use of the forward slash in the text. For example, we find the following pairs (with a bit of context, because I am not even sure how should this parse, …
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## [Janus: py\_call(1 + 2, Sum)](https://swi-prolog.discourse.group/t/janus-py-call-1-2-sum/8876)
In the Foreign Include File section, there is subsection 12.4.9, Serializing and deserializing Prolog terms. If I am reading this correctly, it only discusses de-serialization through PL\_put\_term\_from\_chars(). Is the se…
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## [Misleading documentation of sort/4](https://swi-prolog.discourse.group/t/misleading-documentation-of-sort-4/8716)
Hi The documention of sort/4 sort/4 says: The following example sorts a list of rows, for example resulting from csv\_read\_file/2) ascending on the 3th column and descending on the 4th column: sort(4, @\>=, Rows0, Rows…
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## [PlDoc and foreign code](https://swi-prolog.discourse.group/t/pldoc-and-foreign-code/8577)
Can I get PlDoc to slurp up predicate documentation comments for foreign predicates (i.e., written in C or C++ and registered using some variety of PL\_register\_\*)? I have a definition this, registered using the SWI-cpp2…
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## [How to Retrieve All Outputs from SWISH Prolog?](https://swi-prolog.discourse.group/t/how-to-retrieve-all-outputs-from-swish-prolog/7703)
How to Retrieve All Outputs and Understand Variable Creation as we can do it in web version of swi prolog?
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## [Http\_open throwing an error in version 9.3.6](https://swi-prolog.discourse.group/t/http-open-throwing-an-error-in-version-9-3-6/7563)
I just ran a script that used to work (I posted the code a while back at Initial attempt at a kif to Prolog translator), but running the same example now produces: ERROR: /usr/lib/swipl/library/http/http\_open.pl:67: ERR…
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## [Exported procedure socket:tcp\_connect/2 is not defined](https://swi-prolog.discourse.group/t/exported-procedure-socket-tcp-connect-2-is-not-defined/7546)
Hi, Past year I had no time to play with Prolog but today I finally found time to get back to work on a project I had started earlier. I was still using a Swipl version that was over a year old. Updating Swipl did not …
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## [Confusion with C++ interface and Prolog lists](https://swi-prolog.discourse.group/t/confusion-with-c-interface-and-prolog-lists/6355)
The examples do a good job of explaining PREDICATE and unifying atoms and integers within those predicates. I am struggling to understand how to unify new Prolog lists within this context and there are not a lot of exam…
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## [Unit test fails from R](https://swi-prolog.discourse.group/t/unit-test-fails-from-r/7448)
I copied this snipped from the unit tests: test\_interrupt(Goal) :- thread\_self(Me), thread\_create(run(Me, Goal), Id, \[\]), thread\_get\_message(running), sleep(0.1), thread\_signal(Id…
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## [Problem with Calling Prolog from Python](https://swi-prolog.discourse.group/t/problem-with-calling-prolog-from-python/7350)
I successfully did some Prolog from Python examples but failed on this one: import janus\_swi as janus janus.consult("get", """ :- use\_module(library(lists)). frame(name(bird), isa(animal), \[travel(flies), feathers\], \[ …
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## [Pldoc predicate ordering](https://swi-prolog.discourse.group/t/pldoc-predicate-ordering/7264)
I’m in the process of adding pldoc to a module and I’m struggling with the order in which the exported predicates appear in the doc. Basic scenario: I have a module with fairly long export list. About half the exported p…
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## [Swipl-win.exe crash... hint about debugging](https://swi-prolog.discourse.group/t/swipl-win-exe-crash-hint-about-debugging/7096)
I’m trying to develop a swipl-win (Qt 6.6) interface for OGDF, but I’ve got the following SIGSEGV GDB report in QtCreator:1 strlen 0x7ffb3ec92071 2 libswipl!PL\_new\_ato…
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## [Module unload/delete](https://swi-prolog.discourse.group/t/module-unload-delete/7222)
I am sure i have missed the obvious,… but if i have loaded a large module, but then dont need it anymore, how do I unload / delete the module so resources can be returned to the core ! … Ready to be embarrassed
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## [PlDoc with reexport](https://swi-prolog.discourse.group/t/pldoc-with-reexport/7039)
Hi all, I noticed a glitch of PlDoc with modules that reexports the predicates of another module with the reexport directive. When showing the PlDoc page of the original module, the reexported predicates, even if corre…
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## [How to use "gtrace" in VScode?](https://swi-prolog.discourse.group/t/how-to-use-gtrace-in-vscode/7033)
I have \[SWI-Prolog 9.0.4\] installed. When I open swipl in vscode and type “gtrace.” in terminal, it shows: ?- gtrace. Correct to: "trace"? no ERROR: Unknown procedure: gtrace/0 ERROR: However, there are definitions f…
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## [Linux 22.04, wanting graphical user interface](https://swi-prolog.discourse.group/t/linux-22-04-wanting-graphical-user-interface/6992)
on ubuntu 2204 hi im , prolog 9.1.18 wanted deve version so used snap install. start from commandline as prolog other names dont work swi-prolog etc pce does not work Also use\_library( pce ) which loads but …
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## [How to preserve JS expressions unquoted in arguments](https://swi-prolog.discourse.group/t/how-to-preserve-js-expressions-unquoted-in-arguments/6853)
I can’t figure out how to preserve a JS expression in an HTML argument in html\_write. Here is an example from the HTMX book (Extending HTML As Hypermedia). I want to generate this expression in HTML: \