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by knute
Sun Dec 06, 2020 2:18 am
Forum: Troubleshooting
Topic: Pulseaudio and VLC?
Replies: 17
Views: 866

Re: Pulseaudio and VLC?

I tried your tone file and it skips in the first couple of seconds of playback. I have noticed that once in a while it doesn't do that but no repeatable and only very rarely.
by knute
Sat Dec 05, 2020 8:09 pm
Forum: Troubleshooting
Topic: Pulseaudio and VLC?
Replies: 17
Views: 866

Pulseaudio and VLC?

When vlc starts now it skips audio in the first few seconds of playing. The only thing new is the updates to use pulseaudio. This only happens when I use vlc, if I play sounds with Java it never skips. Any body know how to fix it?
by knute
Mon Nov 30, 2020 2:50 am
Forum: C/C++
Topic: multi threading in c
Replies: 7
Views: 737

Re: multi threading in c

Threads are pretty simple in C++. The compiler command line is in the code. #include <iostream> #include <unistd.h> #include <thread> // g++ mt.c -o mt -lpthread using namespace std; void a() { for (int i=0; i<25; i++) { cout << "a"; cout.flush(); sleep(1); } } void b() { for (int i=0; i<1...
by knute
Mon Nov 30, 2020 2:20 am
Forum: Advanced users
Topic: VPN Client?
Replies: 5
Views: 241

Re: VPN Client?

Have you looked at pptp-linux (pptp client) and/or pptpd (pptp server)? Yes, they're rudimentary, but better than /dev/null Yes, that's all I found. I got to believe there is something simpler available for the Pi. On Xubuntu it is super simple to set up. The little network widget on the taskbar ha...
by knute
Mon Nov 30, 2020 12:27 am
Forum: Advanced users
Topic: VPN Client?
Replies: 5
Views: 241

Re: VPN Client?

logcabin wrote:
Sun Nov 29, 2020 10:39 pm
Have you considered WireGuard? Easy to set up, and runs like greased lightning.
That's an VPN tunnel scheme. I need a VPN client to connect with existing servers. The servers are running in routers at remote locations. I can't use a different scheme.
by knute
Sun Nov 29, 2020 4:07 pm
Forum: Advanced users
Topic: VPN Client?
Replies: 5
Views: 241

VPN Client?

I need to set up a client to use with several PPTP VPN servers at remote locations. I looked around for information on RaspberryPi PPTP VPN clients and found nothing. There is some data out there on setting up a PPTP VPN client under Debian. On Xubuntu there is a widget that does network connections...
by knute
Thu Nov 26, 2020 4:02 pm
Forum: Java
Topic: Display JPG images on JAVAFX does'nt work
Replies: 7
Views: 849

Re: Display JPG images on JAVAFX does'nt work

I tried to use openjdk11 without success that's why I use Bellsoft. If you have any time to help me it would be great ! It can be a bit daunting to figure out what's actually going on (not that I really have a good handle on it) and make it work. So I'm going to assume that you installed openjdk-11...
by knute
Fri Nov 20, 2020 5:01 pm
Forum: Java
Topic: Display JPG images on JAVAFX does'nt work
Replies: 7
Views: 849

Re: Display JPG images on JAVAFX does'nt work

I'm pretty sure it is a BellSoft bug. Loading a JPEG image works fine if you use the OpenJDK11 and OpenJFX11 from the repository. Using it is a little more complicated than using Liberica because you have to list the module path and added modules on the command line. Let me know if you want any help...
by knute
Thu Nov 19, 2020 4:46 pm
Forum: Java
Topic: Display JPG images on JAVAFX does'nt work
Replies: 7
Views: 849

Re: Display JPG images on JAVAFX does'nt work

I found the same thing with Bellsoft JDK 15 on my Pi. I'm not sure what's causing it but it looks like a bug. I'm really surprised this hasn't shown up some where before. I'll look into it some more.
by knute
Tue Nov 17, 2020 9:56 pm
Forum: Graphics, sound and multimedia
Topic: Small monitor - big clock!
Replies: 5
Views: 410

Re: Small monitor - big clock!

How about an analog clock? With Java 11 or later run it with: java AnalogClock.java import java.awt.*; import java.awt.event.*; import java.awt.geom.*; import java.time.*; import javax.swing.*; /** * AnalogClock is a resizable Swing component that draws an analog clock. * * @author Knute Johnson * @...
by knute
Mon Nov 16, 2020 4:24 pm
Forum: Troubleshooting
Topic: Unable to properly install java
Replies: 13
Views: 593

Re: Unable to properly install java

In your first attempt I thought that apt was supposed to check processor against the install and bomb out before trying to install the wrong version? Perhaps it was just that one file jks-keystore that slipped through the net? Strange! I haven't tried to install it from the repository to a Pi 1 in ...
by knute
Mon Nov 16, 2020 4:07 am
Forum: Troubleshooting
Topic: Unable to properly install java
Replies: 13
Views: 593

Re: Unable to properly install java

Ok, maybe im just stupid and overread something but I followed the installation guide and well [pi@raspberrypi:/usr/lib/jvm $ java -bash: java: command not found If the java program is in /usr/lib/jvm and it appears you are too then you need to use the command: ./java Where did you unzip the Zulu J...
by knute
Fri Oct 23, 2020 8:29 pm
Forum: Troubleshooting
Topic: gpio-shutdown not working?
Replies: 3
Views: 148

Re: gpio-shutdown not working?

Do you have I2C enabled? Enabling I2C 1 on the default pins blocks the gpio-shutdown overlay from functioning on GPIO 3. It has no impact on using GPIO 3 for restart. Not too sure why I2C was enabled but it was. Disabled it works again. Thanks very much. What is set for HandlePowerKey in /etc/syste...
by knute
Fri Oct 23, 2020 4:43 pm
Forum: Troubleshooting
Topic: gpio-shutdown not working?
Replies: 3
Views: 148

gpio-shutdown not working?

For some reason gpio-shutdown is not working on my Pi4. I have the dtoverlay=gpio-shutdown in my /boot/config.txt file under [all]. I have a push button switch between pins 5 and 6. The button works if the Pi is halted to restart it so the GPIO is probably not bad.

Any ideas?
by knute
Thu Oct 22, 2020 1:40 am
Forum: C/C++
Topic: Interpreting command line arguments passed to main()
Replies: 11
Views: 803

Re: Interpreting command line arguments passed to main()

To add to what DEA said: From man strcmp: DESCRIPTION The strcmp() function compares the two strings s1 and s2. It returns an integer less than, equal to, or greater than zero if s1 is found, respectively, to be less than, to match, or be greater than s2. So a match returns 0. This is a template tha...
by knute
Wed Oct 07, 2020 9:07 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Serial port versus USB?
Replies: 1
Views: 198

Serial port versus USB?

I don't know much about the serial port on the Pi (read that as nothing). I've got a sensor I've been communicating with via /dev/ttyUSB0. I'm using a C++ SDK to write code for this sensor. The plan is to change from the USB port to using the serial port on the Pi and stop using the USB to serial co...
by knute
Wed Oct 07, 2020 8:12 pm
Forum: Networking and servers
Topic: iptables reverse resolving ufw IPs?
Replies: 17
Views: 554

Re: iptables reverse resolving ufw IPs?

Google hit a badly configured rate limit on day-one so has slowed its crawl rate ever since - it seems to be going on forever. Since then I've tuned my DOS limit to 600 hits a minute with a 200 second ban time but you can't tune Googles crawl speed so I'm stuck on slow crawl. Does the Google crawle...
by knute
Wed Oct 07, 2020 1:53 pm
Forum: Networking and servers
Topic: iptables reverse resolving ufw IPs?
Replies: 17
Views: 554

Re: iptables reverse resolving ufw IPs?

My router firewall has a huge collection of IPs from China, Russia and a few other places. What are you going to do. Looks like I can't alter the apache timings without getting performance hits. I don't trust my router so I have started putting some perm-bans in ufw, I have a cron that logs all IPs...
by knute
Wed Oct 07, 2020 2:01 am
Forum: Networking and servers
Topic: iptables reverse resolving ufw IPs?
Replies: 17
Views: 554

Re: iptables reverse resolving ufw IPs?

My router firewall has a huge collection of IPs from China, Russia and a few other places. What are you going to do.
by knute
Wed Oct 07, 2020 1:59 am
Forum: General discussion
Topic: Running Rasberry Pi in background without Gui
Replies: 14
Views: 556

Re: Running Rasberry Pi in background without Gui

I wish people would quit saying that Java is slow. Java has some startup time but then it runs really fast. I will grant that Java's virtual machine is impressively quick for a byte code interpreter. JIT compilers are amazing. But it is demonstrably slower than compiled to native languages: https:/...
by knute
Wed Oct 07, 2020 1:26 am
Forum: Beginners
Topic: GUI programming outside the RPi Desktop...?
Replies: 11
Views: 524

Re: GUI programming outside the RPi Desktop...?

Have it boot to the desktop and start your program with systemd. Wait for the graphical target. Here is an example of a systemd service file that runs a Java program. This boots, starts the program after the desktop is up, and restarts it if it stops for any reason. If you need specific instructions...
by knute
Mon Oct 05, 2020 11:14 pm
Forum: Networking and servers
Topic: iptables reverse resolving ufw IPs?
Replies: 17
Views: 554

Re: iptables reverse resolving ufw IPs?

It is UFW that places all the entries into Iptables. I'm suspecting something is wrong because some ufw/iptable reject IPs still get through to apache over a minute after they are set to reject. Any connections that were established before the new rules were enabled will probably still be connected...
by knute
Mon Oct 05, 2020 10:58 pm
Forum: General discussion
Topic: Running Rasberry Pi in background without Gui
Replies: 14
Views: 556

Re: Running Rasberry Pi in background without Gui

How could I fix the heat issue or is this just normal (my program uses Javas Timer at fixed rate every 12 hours)? The other, way bigger problem right now is, that I don’t get the program to the Pi. My USB - Stick doesn’t get shown in the media folder and I couldn’t figure the connection via WIFI ou...
by knute
Mon Oct 05, 2020 10:15 pm
Forum: Beginners
Topic: GUI programming outside the RPi Desktop...?
Replies: 11
Views: 524

Re: GUI programming outside the RPi Desktop...?

pidd wrote:
Mon Oct 05, 2020 3:00 pm
wizrod wrote:
Mon Oct 05, 2020 2:34 pm
My issue with the Desktop is that its unusably slow...it takes seconds for any input (mouse or keyboard) to be recognised... Imagine taking 30+secs just to type in 'Hello world!'...?!
I suspect there is something seriously wrong there
I agree!

Are you running a 0 or 1 pidd?
by knute
Sun Oct 04, 2020 7:10 pm
Forum: Beginners
Topic: GUI programming outside the RPi Desktop...?
Replies: 11
Views: 524

Re: GUI programming outside the RPi Desktop...?

Hi all, I'm now planning a new project that will combine a couple of rotary encoders and a touch screen, to give a 'digital finder scope' for a telescope. To this end, I will need to build a GUI, but I don't want to build a Desktop application, as the desktop sucks up far too much system performanc...

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