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Topic: pass variables via command line? (Read 1844 times) |
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sspboyd
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pass variables via command line?
« on: Jul 21st, 2004, 12:06am » |
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I have a program that reads colour palettes from large images and I like to run it from the command line rather then via processing. Is it possible to pass a variable to an exported sketch via the command line?
eg:
/usr/bin/java -myVar="neon.jpg" -Xms512m -Xmx512m -classpath .:./rc5.jar BApplet rc5
Or I guess even better would be the ability to read a prefs file. (thinking outloud now, I guess I could just specify a text file to be read and parse it for the vars I want).
That would be much easier than recompile/export it each time I want to change the source image.
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gmail.com w/ sspboyd username
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sspboyd
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Re: pass variables via command line?
« Reply #2 on: Jul 21st, 2004, 6:11pm » |
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I have started using a text file to store the vars I want to use. Works really well. The first lines of the text file contain just one word or number each.
I am using it as such:
Code:String prefs[] = loadStrings("http://127.0.0.1/p5/bm3/prefs.txt");
// String Value
fn=prefs[1];
// Int values
divW=toInt(prefs[2]);
divH=toInt(prefs[3]);
minLen=toInt(prefs[4]);
pxSkip=toInt(prefs[5]);
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I have not figured out yet how to use this method to set boolean values though. Any ideas?
steve
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gmail.com w/ sspboyd username
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TomC
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Re: pass variables via command line?
« Reply #3 on: Jul 21st, 2004, 6:26pm » |
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I'm guessing there isn't a toBoolean function in the processing API, so you'll have to turn to the Java API to help you. There are 2 choices - use String.equals() or use Boolean.getBoolean().
Code:
String yes = "true";
String no = "anythingButTrue";
println(yes);
println(no);
boolean y1 = Boolean.getBoolean(yes);
boolean n1 = Boolean.getBoolean(no);
println(y1);
println(n1);
boolean y2 = yes.equals("true");
boolean n2 = no.equals("true");
println(y2);
println(n2);
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sspboyd
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Re: pass variables via command line?
« Reply #4 on: Jul 21st, 2004, 6:40pm » |
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very cool. thanks. I didn't know about those.
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gmail.com w/ sspboyd username
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fjen
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Re: pass variables via command line?
« Reply #5 on: Jul 24th, 2004, 1:17pm » |
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or ... to shorten things do like this:
Code:
String arg = "0"; // 1 for true, anything else for false
boolean t_or_f = arg == "1" ? true : false;
println(t_or_f);
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fry
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Re: pass variables via command line?
« Reply #6 on: Jul 24th, 2004, 2:53pm » |
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the "official" way to parse a boolean in java is:
booleab b = new Boolean(theString).booleanValue();
yech.
megabucket will have toBoolean(), and you can also cast strings to booleans, so:
boolean b = toBoolean(theString);
and
boolean b = boolean(theString);
will both be valid in the next release.
also, args[] will be an array inside your applet that magically reads all the command line args for you. so when you type
java PApplet MySketch apple bear cat
the args[] variable will contain:
{ "apple", "bear", "cat" }
also helpful for reading prefs is the java "Properties" class, in java.util. it makes it easy to read in a file full of
someattribute=somevalue
it's how pde.properties is (at least pre-megabucket) handled, for instance.
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