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by rasp87
Tue Aug 11, 2015 5:34 am
Forum: Advanced users
Topic: SD data seems to be corrupted after a while
Replies: 3
Views: 921

Re: SD data seems to be corrupted after a while

...The app is tested and error free. error free?! is your app a oneliner?! :P ;) Well, :D I mean I'm sure this abnormal behavior is not due to software errors since I 've seen it working for a while. ...By the way, our app is run when the raspbian os starts automatically every time. when it starts ...
by rasp87
Sun Aug 09, 2015 12:17 pm
Forum: Advanced users
Topic: SD data seems to be corrupted after a while
Replies: 3
Views: 921

SD data seems to be corrupted after a while

So we are running an app on the pi to communicate with Psoc and control a device that we have made. The app is tested and error free. We can keep using of it for a while (say 2 weeks) with the device working fine. But after some time the device is strangely malfunctioning. Some random movement comma...
by rasp87
Tue May 26, 2015 11:19 am
Forum: Advanced users
Topic: how to reduce image size
Replies: 5
Views: 12830

how to reduce image size

I usually use win32diskimager to read an 8gb sd card images. Even though I have enough free space on card my image sizes are very big. How can I reduce the image size in a way that it is easily written on another card of the same size?
by rasp87
Mon Apr 27, 2015 3:46 pm
Forum: Advanced users
Topic: How to produce sound with C++ on Raspbian?
Replies: 11
Views: 5054

Re: How to produce sound with C++ on Raspbian?

PeterO wrote:
rasp87 wrote: Is there a simpler way with c++ built-in libraries without a need to install other stuff?
I assumed you knew C++ but it seems you don't :roll:

PeterO
I know c++ bro. But I just didn't want to add other libraries and packages and etc.
by rasp87
Mon Apr 27, 2015 3:33 pm
Forum: Advanced users
Topic: How to produce sound with C++ on Raspbian?
Replies: 11
Views: 5054

Re: How to produce sound with C++ on Raspbian?

ghans wrote:Here is some creative application of this technique :
https://www.youtube.com/watch?v=GtQdIYUtAHg
ghans
Wow! This job is beautiful. Thank you for the video!
by rasp87
Sun Apr 26, 2015 10:22 am
Forum: Advanced users
Topic: How to produce sound with C++ on Raspbian?
Replies: 11
Views: 5054

Re: How to produce sound with C++ on Raspbian?

One way is to use the ALSA API. http://www.alsa-project.org/alsa-doc/alsa-lib/index.html A simple example http://www.alsa-project.org/alsa-doc/alsa-lib/_2test_2pcm_min_8c-example.html A comprehensive example http://www.alsa-project.org/alsa-doc/alsa-lib/_2test_2pcm_8c-example.html PeterO Is there a...
by rasp87
Sun Apr 26, 2015 9:40 am
Forum: Advanced users
Topic: How to produce sound with C++ on Raspbian?
Replies: 11
Views: 5054

How to produce sound with C++ on Raspbian?

How can I produce beep sound with c++ code on Raspbian os (and how can I produce other sounds)?
by rasp87
Tue Mar 17, 2015 12:13 pm
Forum: Advanced users
Topic: Can't write sd card image to another sd of the same typr
Replies: 5
Views: 903

Re: Can't write sd card image to another sd of the same typr

I agree with your point that copying or rsyncing the files is the best overall solution (though not that newbie-accessible). Are you saying that, instead of reading/writing the image, if I open up my card on a linux system and just copy all of it's contents and paste them into another card, I will ...
by rasp87
Tue Mar 17, 2015 11:30 am
Forum: Advanced users
Topic: Can't write sd card image to another sd of the same typr
Replies: 5
Views: 903

Can't write sd card image to another sd of the same typr

I have an image of a silicon power sdhc card (class4 - 8GB) with a size of 7.48 GBs. Now when I try to write that image to another fresh card of the exact same type, I don't have enough space. It shows me 7.20 GB free space. Where is this space wasted?
by rasp87
Sat Jan 03, 2015 7:45 am
Forum: Advanced users
Topic: How to build a local website on pi
Replies: 8
Views: 2234

Re: How to build a local website on pi

MalSoft wrote: Best of luck and a Happy New Year ;)
Happy new year! And thank you everybody for your help.
by rasp87
Wed Dec 31, 2014 10:43 am
Forum: Advanced users
Topic: How to build a local website on pi
Replies: 8
Views: 2234

Re: How to build a local website on pi

DougieLawson wrote:sudo apt-get install apache2 mysql-server python-mysql libapache2-php
Should get you a LAMP stack running on your RPi.
OK, now that I've installed apache, how can I access files in other folders of filesystem (for example what URL I need to access a file on /media/usb0)?
by rasp87
Mon Dec 29, 2014 11:50 am
Forum: Advanced users
Topic: How to build a local website on pi
Replies: 8
Views: 2234

How to build a local website on pi

My pi has got a static ip address. I'm trying to build some local website on it that is accessible by this ip for authorized users only in the local network. This site is going to get some data from files in pi and display them to the user and he might decide to modify this data. What is the easiest...
by rasp87
Tue Dec 09, 2014 11:47 am
Forum: C/C++
Topic: Restricting file access to an app
Replies: 23
Views: 3440

Re: Restricting file access to an app

That is not because of the setgid. It is happening because the gpio library uses direct register access to the hardware, so it needs root privilege to open /dev/mem. You can make the executable setuid root and setgid: sudo chown root:groupname app-path sudo chmod u+s,g+s app-path What do these comm...
by rasp87
Tue Dec 09, 2014 10:14 am
Forum: C/C++
Topic: Restricting file access to an app
Replies: 23
Views: 3440

Re: Restricting file access to an app

No you need to create a new group or use an existing one that doesn't have the current user as a member. So you need to replace groupname with the name of the group you are going to use and replace app-path with the path to the application. However, setting the user or the group of an executable on...
by rasp87
Sun Dec 07, 2014 1:05 pm
Forum: C/C++
Topic: Restricting file access to an app
Replies: 23
Views: 3440

Re: Restricting file access to an app

ghans wrote:You are replacing "groupname" etc. wih YOUR group , aren't you ?

If that still doesn't work , try chgrp instead.

ghans
Sure! :) But chgrp worked fine for me now. Thanks! I'll be continuing with the next steps tomorrow.
by rasp87
Sun Dec 07, 2014 12:54 pm
Forum: C/C++
Topic: Restricting file access to an app
Replies: 23
Views: 3440

Re: Restricting file access to an app

No you need to create a new group or use an existing one that doesn't have the current user as a member. So you need to replace groupname with the name of the group you are going to use and replace app-path with the path to the application. As I mentioned above, I've created a group (say groupname ...
by rasp87
Sun Dec 07, 2014 11:21 am
Forum: C/C++
Topic: Restricting file access to an app
Replies: 23
Views: 3440

Re: Restricting file access to an app

aTao wrote:Or you could encrypt the data.
The problem with encrypting is that although someone may be unable to understand the file, he can modify it and ruin stored data.
by rasp87
Sun Dec 07, 2014 9:19 am
Forum: C/C++
Topic: Restricting file access to an app
Replies: 23
Views: 3440

Re: Restricting file access to an app

joan wrote:Use chown on the executable.
chown groupname app-path says "invalid user". Do I have to create another user that belongs to newly created group and then use chown?
by rasp87
Sun Dec 07, 2014 8:31 am
Forum: C/C++
Topic: Restricting file access to an app
Replies: 23
Views: 3440

Re: Restricting file access to an app

[quote="joan"Assign the app to the group[/quote]
I created a group for my app. How can I assign an app to a group now?
by rasp87
Sat Dec 06, 2014 7:52 am
Forum: Advanced users
Topic: connecting to a flash memory via local network
Replies: 4
Views: 1017

Re: connecting to a flash memory via local network

Add /media/usb0 as a CIFS share in /etc/smb.conf. [media] path = /media/usb0 read only = no create mask = 0644 Then you should be able to connect to \\pi.local\media on your Windows machines. Yes! This works when editing /etc/samba/smb.conf! Thank you! I have another question about this config file...
by rasp87
Tue Dec 02, 2014 12:57 pm
Forum: Advanced users
Topic: connecting to a flash memory via local network
Replies: 4
Views: 1017

connecting to a flash memory via local network

I have installed usbmount. Whenever I insert a flash memory to usb port, it is accessible from /media/usb0. I have also installed samba. Now how can I access this flash from windows with a network drive (like I do for other shared folders or home directories of pi )?
by rasp87
Mon Dec 01, 2014 11:14 am
Forum: C/C++
Topic: Restricting file access to an app
Replies: 23
Views: 3440

Re: Restricting file access to an app

Any ideas?
by rasp87
Wed Nov 26, 2014 7:02 am
Forum: C/C++
Topic: Restricting file access to an app
Replies: 23
Views: 3440

Restricting file access to an app

I'm running a c++ app on a Raspbian system. Is there a way to make a txt file accessible only by this app? I mean even the user that the app is run by can't edit the file manually by txt editor and only the app itself can read/write in it.
by rasp87
Mon Nov 17, 2014 11:24 am
Forum: Advanced users
Topic: Where to store an app password
Replies: 5
Views: 1104

Re: Where to store an app password

ghans wrote:I don't know what you are planning to do :lol: ).
Actually I'm planning to send a rocket! :twisted: And that is the password you need to enter after pushing the big red button! ;)
by rasp87
Mon Nov 17, 2014 10:16 am
Forum: Advanced users
Topic: Where to store an app password
Replies: 5
Views: 1104

Re: Where to store an app password

Is there a reason why you can't hash the password with PBKDF2 or scrypt and store/compare to the hash instead ? That way , no plaintext password exists which could be leaked. Secondly , an attacker would have to use brute force and that would be extremely slow / extremely expensive for him. ghans U...

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