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Parsing JSON
I have expressed some interest in developing the interface withthe Hatchery forthe MCH2022 badge. Theplan is that aRESTAPI will bedeveloped for the Hatchery. For this it will be needed to parse someJSON. For this, I am lookinginto some existing JSON parsing libraries. These are the libraries that Ilooked into:- cJSON: Ultralightweight JSON parser in ANSI C. I would not call itultralightweight, because it builds a tree structure when parsing the JSON.But for processing JSON it is not neccessary to first build a genericdata structure and next process this structure. I think that in anembedded system memory allocations should be avoided as much as possible.The fact that it does not use a union in the definition of the nodes, doesnot make it particular lightweight with respect to memory usage.
- JSMN jsmn (pronounced like'jasmine') is a minimalistic JSON parser in C. It looks a little moreleightweight because it does not build up a structure, but instead fillsan array with tokens that point to the JSON input. It does thus notallocate any memory when called, but you have to specify the number oftokens before calling the function. That is nice when you for parsing JSONmessages with a known structures and a limited length. This too is alibrary that parses the whole JSON in one go and requires you to processthe result.
- Frozen: JSON parser and emitterfor C/C++. It has a different approach. It has aSAX parser where you need to provide a call-back function.Personally, Idislike SAX like parsers.But beside this it also has some other methods to extract data from aJSON string similar tothe scanf function. It also has some functions to parse JSON arrays.
- Parson is a lightweight jsonlibrary written in C. Also uses some internal structure to represent theJSON.
- tiny-json also parsesa JSON string into a tree. Also provides some methods to navigate thatstructure.
- JSON-C: A JSONimplementation in C. It looks very complete, but not very lightweight.
- Jansson. Also looks verycomplete, but again not very lightweight. In theload.c, I did find thelex_scan function, thatimplements a lexical scanner for JSON.
I am thinking about developing my own JSON parser as an iterator, much likethelex_scan function from Jansson, for processing data received fromthe Hatchery. I think, I first want to study the code from performing anHTTP request in the badge and/or storing the data in a local file system (forcaching).
Staggering Genius
I finishedreading the bookA Heartbreaking Work of Staggering Genius by Dave Eggers, which Istarted reading on May 6 after I bought it onFriday,April 29 second-hand. On the front of the book there is a round stickerfromIllini Union Bookstore withthe text '30% off' suggesting that the book was bought there. OnMay 8, I already wrote something about the book. At some point, I wasafraid that the author was just being funny for the sagke of being funny, butthe book also has some serious content. I found the book a bit long-winded hereand there, especially regarding the parts with internal dialogue. I searchedabout some information about theMight magazin but did not find much.With respect to implementing an app store for thethe MCH2022 badge, have been studying theESP HTTP Client andthe example program . It works with a callback function that is calledwhenever results are received. If the data is JSON and you immediately wantto process it, you need a JSON parser that can process chunks of data. If youimmediately want to process the parsed JSON, you could use some techniquelikeprotothreads for C.I started to writesome example code.
KunstenLandschap
This afternoon, I biked around the route ofKunstenLandschap 2022. I found the following worksworth mentioning:
Een oude stem van wind en zoutI also paid a visit toRijksmuseum Twenthe,which also made part of the event, where I saw the following works part of theexhibitionCollectie Wilploo:
- WetmatigeBeweging (Zwart-Wit) (1965) by Peter Struycken.
- Buiten de oever (2002) byElsbeth Cochius.
- Beukenbos (2006) by Elsbeth Cochius.
- The Embium Building in the Sky (2011) by Rik Smits.
- Recreatiegebied #9 (2003) byRenie Spoelstra.
- ZT (B03#12) (2019) by Ruri Matsumoto.
- Zonder titel (2011) by Abdalbagi Ainyal.
On the way home, I went tobookshop Broekhuis,were at 17:02:39, I bought the bookHenry & June written byAnaïs Nin,translated fromtheEnglish edition into Dutch by Margaretha Dorothea Ferguson, publishedby Volkskrant Verboden Boeken in 2012,ISBN:8710371001989, for € 6.95. At home I discovered that I alreadyat an edition of this book.
Books and cable
Around 11 o'clock, I got two books and a USB-cable in the mail. The books are:The USB cable is to connect myPanasonic LumixDMC-TZ8 and download the date. Just like in2018 the SD card has become stuck in the camera after a period where itdid not want to stay inside and I had to push it in during taking a photograph.This was also after the cover for the SD card and the battery broke off. Sincesome time the camera also has some wear on the LCD screen. But for the rest, itis still working. This time, I thought it was beter not to try to repair theSD card holder like I did before, but use the USB cable. It took me some timeto figure out which USB cable I needed.
Doublets
After I saw theexhibitionErgens in hetmidden... again, I went to Concorodia, where I saw the exhibitionDoublet with murals byPetravan Noort (who is from Rotterdam) and an installation byMarleen Kappe (who is fromAmsterdam).
Drents Museum
Conny and I went to theDrenthe province. We first went toDrents Museum inAssen,the capital of Drenthe. There we saw severalexhibitions. The first exhibition we saw wasUnder the Spell of Mount Ararat.Next, we saw the exhibitionSam Drukker, which consist mainly of self-portrait of the painterSam Drukker. I found the followingpaintings noteworthy:- Self-Portrait with Lobster, 2002
- Portrait, 2009
- In the Bath with Marat, 2005
- Without Title (Naked Self-Portrait), 2019
- Portrait with Green Collar, 2015
- Self-Portrait with Bare Shoulder, 2004
- Self-Portrait in front of Easel, 2010
- It is a Boy, 1996
- The Connoisseur, 2002
- Remembrance of Matthijs / After Matthijs Röling, 2003
- The Nose Picker, circa 2006
- Lying man, 2009
- Self-Portrait with Red Shirt, 2022
- The Potato-Eater, 1993
- Portrait 464, 2003
- The Teacher, 1993
- Self-Portrait with Paper Hat, 2006
Next we saw three works byMerlijne Marell:- Dandelion and bumblebee, 2022
- River bullhead, 2022
- Stag-beetle, 2022
The last exhibition we saw, wasUnlimited with self-portraits from the collection of the museum. I foundthe following self-portraits noteworthy:- Self-Portrait in Red Bathrobe, Barend Blankert, 2007
- Self-Portrait, Rsemin Hendriks, 2003
- Self-Portrait, Louis Albert Roessingh, 1832
- Self-Portrait, Alfred Hafkenscheid, 2014
- Self-Portrait with Paintbrush, Theo l'Herminez, 1990
- Self-Portrait, Thy Jansen, 2008
- Self-Portrait, Jan Mankes, date unknown
- Self-Portrait, Sinta Salter-Heddema, date unknown
- Soulmate,Tamara Müller, 2007
- Self-Shortened, Arout van Albada, 2008
- Self-Portrait, Jan Roëde, date unknown
- Self-Portrait, Georg Ruefer, date unknown
- Self-Portrait, Chris Lebean, circa 1933
- Self-Portrait, Hans Hoekstra, 2013
- Self-Portrait Naked Full-Length, Karel Bushes, 1995
- Self-Portrait, Herman Tulp, 1978
- Self-Portrait with Snorkel, Pieter Pander, 2004
- The Mole Catcher, Rinus van der Meer, 1984
- Videocalling with Background, Peter Hartwig, 2021
- Toilet, Tamara Müller, 2009
- Jealousies, Ilse Meijer, 1996
- Self-Portrait, Theo l'Herminez, 1996
- Monochrome Self-Portrait with Cap,Philips Akkerman, 2003
- Self-Portrait, Philips Akkerman, 2007
- Inferior with Painter and his Model, Matthijs Röling, 1970
- Self-Portrait with wife, Bart Peizel, 1918
- In-Between Self, Deborah Poynton, 2021
Afterwards, we went walking inDwingelderveld National Park where we sawDwingeloo Radio Observatory near the offices ofASTRON.
This morning, I finishedreading the bookNietzsche written byPaul van Tongeren, who recently has been granted the honorary title'Thinker of the Fatherland'. I started reading the book on May 29. I boughtthe book onNovember 27. The book is aboutFriedrichNietzsche, his life as a philisopher and less about his personal life.(The name ofLou Salomé is only mentioned twice in the book.) After finishingthe book, I felt that the life of Nietzsche has some resemblance with thatof Vincent van Gogh. I liked the book and I got the impression that it is agood introduction to Nietzsche as a philosopher.
Truck Run 2022
Today,Andy and I joined the yearly Truck Runorganized byDeTukker Truckers, just like we didfour yearsago. The GPS-track of how we drove inKML fileforGoogle Earth.
AKI MUPI route 2022
I foundAKI MUPI ROUTE 2022 and spend some time in Google Earth connecting thelocations in order to be able to calculate a shortest route to visit all theMUPIs. Then I decided to write a program,ParseMUPIkml.cpp, to parse the KML file and generate input fortheTSP solver, I wrote last year.
32.1° Celsius
The temperature at Twenthe Airport has gone up to32.1° Celsius, which breaks the previous record of 31.3° on this datein 2016.The past two evening, I spend finding a new optimal route. The first shortroute did look a bit strange, crossing itself. When I added more connections,theTSP solver kept on finding only longerroutes. This evening, I made some changes to the solver, which came down togrouping all variants of the same length together and only keeping one. Thatdid result in an interesting route.
Visiting all MUPIs
This morning, I biked along all the MUPIs with a picture of a work of one ofthe AKI graduates on the back. I had written the names of all the students ona piece of paper and if I had not had this, I might have missed one of theMUPIs. It took me two hours and fourty minutes to finish the trip, which wasabout 26Km. I found the works of the following four students noteworthy:
Deventer murder trial
Today, the Dutch newspaperDe Volkskrant reported about the report of the cold case team that lookedat theDeventer murder trial. Just recently,the 2020 filmThe Judgement (Dutch: De veroordeling) was broadcast on Dutch TV, whichis based on a non-fiction book by journalist Bas Haan about the murder case.The film focusses on the fact thatMaurice de Hond in the media claimed that a handyman of the murderedwoman, Michaël de Jong, as being the murder without there being anysubstantial proof and that by doing so, damaged him. According to the book andthe film, it was a case oftrial by media. According to investigative journalist Bas Haan, thereport by the cold case team is not about new insights and new data. In asense this is true. However, it is remarkable that now a police team concludesthat exculpatory evidence for Louwes was withheld by the police and thatvarious disastrous mistakes were made during the investigation. It seems thatthe report states that the two most important pieces of evidence on which theconviction was based, do not hold. It states that it is indeed possible thatthe cell phone of Ernst Louwes connected with the cell tower in Deventer overa distance of 25Km, and that this fact can no longer be used to proof that hewas in Deventer during that time. In the withheld information a connection witha cell tower more than three times the distance was mentioned. The report alsostates that the evidence based on the presence of DNA is invalid, because theblouse on which it was found, was not handled properly. Bas Haan states thatdoubts about the reliability of the evidence was known to the judge whoconvicted Ernst Louwes. The question is what would be the judgement of a judgewhen presented with this case now. It seems that the public opinion now is thatErnst Louwes is the perpetrator and that Maurice de Hond is wrong.
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