How to force Win10 to use certain interface for “browsing”
Problem was that before only two ethernet-interfaces were active. One for the company-intranet (which was gateway for internet) and the second one for some device connection.
After adding some 10 GigE-interface, somehow all DNS-requests were first routed via that interface. Which lead to a delay of 3-4 seconds for loading pages.
Can be fixed via setting a lower metrik to the interface, which influences the routing-table: “network- and sharing option > the specific adapter > “IPv4” > “Settings” > “Advanced settings” > bottom “metric” from “automatic metric” to some lower value. Usually it should be 25, I set 13.
You can check via CMD: $ route print for the current value. The used Gateway should have the lowest metric.
EFI partition on usb-stick: Win10 not able to remove it with the diskmanager
Regular formatting/diskmanager can not handle it.
Additional tools were not available/allowed to install.
So the trick was to use “diskpart” (CMD ..):
- then “list disk”
- “select disk1” (or the one medium which contains the partition(s))
- “clean”
- confirm the error
Then use a regular tool to create a new partition.
Qt: Error: Not a signal or slot declaration
This error is too ‘good’ to be just put into “Today I learned”.
While adapting some unit-testing-code for one of the classes, I received from minGW a error stating:
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Output ------ C:/Repos/repoName/filename.h:23: Error: Not a signal or slot declaration |
What is the problem? The member-declaration looked totally valid.
Until I realized I had removed the (now commented) “private”-statement and therefore the pointers were seen by the MOC as signals/slots. Which they weren’t!
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.. private Q_SLOTS: void initTestCase( void ); void cleanupTestCase( void ); //private: classA* _serialPort = nullptr; classB* _flickerSensor = nullptr; .. |
Shame on me :’)
Win: run script after executing the VisualStudio-environment-command
Problem: our CMakeLists.txt contained one specific variable which is just set via the VisualStudio-command-prompt. But I did not want to start that cmd, then execute our “start IDE”-script from there. Naa, too much clicks 😉
Copy this as bat-file to the directory where the qtcreator.bat would be.
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@echo off rem inspiration from https://www.codeproject.com/Questions/541856/Batchplusfile-3aplusOpenpluscmd-2cplusrunplusVSplu set workingDir=C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools\Common7\Tools\ set vs=VsDevCmd.bat rem execute the VS build enviroment cd %workingDir% call %vs% rem go back to current directory cd /d %~dp0 qtcreator.bat |
python: maximum size of certain containers
Getting the 64 bit version is quite important. Still don’t get it why for Win the 32 bit one was preferred ..
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import sys print(sys.maxsize) |
32 bit: 2147483647 (elements)
64 bit: 9223372036854775807 (elements)
20190711 edit: even if the container could keep that much elements – remember that [Boolean] is 24 Byte (intead of one Bit) in vanilla Python. Means: if you run out of real memory, then MemoryError :/
Education 2019
Time to reveal the plans of the supervised education for 2019: today my course from the “Volkshochschule” (adult evening school?) for “machine learning with Python” starts (you remember the course for advanced Python I did in May 2018 and which I backep up by doing exercises for Project Euler and “365 days coding challenge”? link ). I am really, really looking forward and am eager to learn 🙂
After this is finished in June my course for basic introduction to Mandarin will start (not a ‘computer’ language, but an interesting one) in addition to my daily Duolingo-exercises for this upcoming lingua franca (from my POV). Will be a challenge, especially the spoken version with its intonations.
Last but not least: on week ago I participated in a course as first responder for emergencies (at work).
And I still plan to do a professional certified course for software architecture (the big picture) in autumn.
edit: repo with a apart of the notes from the machine learning with Python-course are at Github.
Heltec WifiKit 8
Ordered myself two Wifikit8 Esp8266-based boards from Aliexpress.
Received them after roundabout two weeks and now the fun can start.
With the integrated 0.91″ display (128×32 Pixel) a lot of effort for integrating some display or LEDs can be saved. Just noticed that a LiPo-charger is built-in as well, wow. For 4,50 € not a bad choice. But I am not 100% sure if this is the real device or some copycat – nevertheless: in the end the functionality matters.
First project-idea is to create an extended and verifyable version of the random-reviewer. With display of the currently chosen person, a big buzzer-button as trigger and a web-interface for those who doubt the true randomness ..
good guides:
- https://robotzero.one/heltec-wifi-kit-8/ – hints for the board itself
- https://www.bastelgarage.ch/heltec-wifi-kit8-board-esp8266-32mbit – hints for the board itself
- https://github.com/olikraus/u8g2/wiki/u8x8reference#drawstring – library for drawing text; works well
Qt: clean includes
(I’ve decided to follow a more agile workflow: instead of creation a “one post covers the whole topic”-post, to post also updates for each step. Article will be therefore edited while “doing”)
Last week I’ve cleaned Qt-includes for a larger project. Like #include to #include how it should be. With proper indirection, so that the Qt-library handles how and where the class is implemented.
A colleauge raised the question, why not use #include to be even more precise and to see the used module directly (needed for the CMakeLists or qmake).
First step: identify all used Qt-includes
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$ git grep "include <Q" | cut -d : -f 2 | sort -u # include <QApplication> # include <QAtomicInt> # include <QDebug> # include <QFileDialog> # include <QHBoxLayout> |
Greps all includes starting with an uppercase Q; then split the result at the “:”; then sort und make it unique
Second step: create a replacement-list and a (python?) script which does this for all .h/.cpp-files
tdb
C++: proper init for double/float and the proper check
Problem was that I initialized some doubles with 0.0 and then hoped that the imported values are assigned, which does not happen always. So a check was needed. But checking if(0.0 == x) is a really bad idea. MinGW will tell you too (as other compilers).
So I was searching for a proper way to check against 0.0. And then I found a better idea: initialize with NaN and use the standard-check against this. Much better!
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#include <limits> .. // init them with NaN to prevent later issues double x{std::numeric_limits<double>::quiet_NaN()}; .. if(isnan(x)) { qDebug() << "uninitialized"; // todom remove return false; } |
(addendum: I know, a variant would be the best to fix the given task.)
I want my Wifi-repeater. Now!
Three weeks ago, while being in the garden, I noticed that there is no network connectivity except by superslow EDGE. Of course, three walls block the Wifi-router, but what about one repeater which is closer and just shielded by one wall? Also I remembered having read about the usage of some ESP-nodes for that. I don’t like the approach of buying some closed-source-product.
Short research yielded the project from martin-ger on Github, which I wanted to use. I was surprised that nothing for the ESP32 is available (only for ESP8266). So I tracked down my single ESP8266 (LoLin, NodeMCU, not sure which revision, but with CH340G-USB-connect and as DevKit (mingling with pulldown-resitors would add another layer of complexity, which I am not sure I want to tackle).
Turns out I could not flash the given item properly with the ESP8266 Download Tool 3.65. It blinks while doing so, but follow-up seral-monitoring onyl yields “lolin ts Jan 8 2013,rst cause:2, boot mode:(3,6)”.
So I ordered a from a german shop a new ESP8266. Looks like exactly the same model.
Will do some quicktest now with the blink-app (basic functionality and flashing works?). And then do a test with the ESP Download tool.
More later ..