Reading and Saving to a txt file in a certain directory HELP!!!

Programming Questions

xdemonx456

Reading and Saving to a txt file in a certain directory HELP!!!

in Programming Questions • 1 year ago

Hello,

Basically i am working on a Web based RC car. I have already made the server and client and everything works great :D

But i have one slight problem. I have exported the client side of the RC Car Controller as a applet to my website and it works fine. But the IP Address and Port are defined within the Source Code. I did have it so that it read a txt file containing the IP Address and Port but when i exported as applet, the txt file became part of the jar file which i dont want. I need to be able to edit this txt file on my website which can then be read by processing and connect to the server.

Thats my first methord but im not sure on how to do it.

The second thing i thought of is prehaps bringing up a dialog box which you enter the IP Address and port into. But the client is created in the void.setup(){}. So i need to bring up the dialog box within the void.setup(){}, you enter the information and when you hit enter it continues with the code with the varibles you just set. Im not sure if this is possible.

I would paste the web link for the client so you can see what i mean by all this but then i would have random people controlling my RC car :P

Any help would be great,

Thanks,

Calum.

Replies(4)

PhiLho

Re: Reading and Saving to a txt file in a certain directory HELP!!!

1 year ago

The first method is simple: loadStrings("http://your.server.org/path/to/config.txt"); should work. It even works without signing the applet since it is on your server, but you might need to sign it for network communication anyway.
The second method is more tricky, as you need to add a GUI library to take user input, and delay client connection until you get the user input.
You can also think out of the box, and of the applet, and use a good old HTML input form, use JavaScript to read it and to send it to the applet. JS communication with applets isn't that hard... (if you know a bit of JS).

xdemonx456

Re: Reading and Saving to a txt file in a certain directory HELP!!!

1 year ago

Thanks for the reply,

I think ill go for the simple methord. And i used loadStrings at first to load from a txt file but like i said because it was in the data folder when i exported as applet it became part of the jar file making it impossible to edit without downloading from my server changing then reuploading. Well my applet is located in:

"http://c*******-c********.nn.pe/Processing/WebCar/WebCarClient/"

Thats where my applet is. So if i had a txt file in that same folder i could just do:

loadStrings("http://C*******-c*******.nn.pe/Processing/WebCar/WebCarClient/IPAddressPort.txt");

And it would load in the strings from the txt file?

If thats correct then that could work. But how would i edit that file? Could i use maybe a seperate Processing program to edit the txt file. Can i still save to a txt file if its on a website?

Thanks,

Calum.

P.S. oh and my applet is already signed for :P

PhiLho

Re: Reading and Saving to a txt file in a certain directory HELP!!!

1 year ago

Yes, I missed the "saving" part which was only in the subject line...
It is much more tricky, alas... You need to have a server side script (or program) that will take some input from the applet (file upload, POST request, some data in a GET request) and write it to the file.
For quite obvious reasons (security), something running on a client cannot, in general, change files on a Web server, unless there is a defined API (generally strictly controlled) on the server to allow this.

xdemonx456

Re: Reading and Saving to a txt file in a certain directory HELP!!!

1 year ago

Hmmm that sounds a bit tricky to me. Think it may be easier to use some sort of HTML (if its possible) to edit the txt file rather then using processing. Im sure i can find something on the web.

Thanks for the help :D

Calum.

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