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Index › Programming Questions & Help › Syntax Questions › Serial.list question
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Serial.list question (Read 634 times)
Jassper
Serial.list question
Apr 16th, 2009, 7:32am  
How do I trap the Array Out of bounds error if no com ports are found?
Code:

void setup()
{
  println(Serial.list());
  myPort = new Serial(this, Serial.list()[0], 9600);
  myPort.bufferUntil(sc);
  

If I run the sketch and no ports are available I get this error;
Code:

Stable Library
=========================================
Native lib Version = RXTX-2.1-7
Java lib Version   = RXTX-2.1-7

Exception in thread "Animation Thread" java.lang.ArrayIndexOutOfBoundsException: 0
	at Test.setup(Test.java:34)
	at processing.core.PApplet.handleDraw(PApplet.java:1400)
	at processing.core.PApplet.run(PApplet.java:1328)
	at java.lang.Thread.run(Unknown Source)


How can I trap this? I have been looking threw the referance but can't find anything and everything I try gives me other errors.

Thanks
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NoahBuddy
Re: Serial.list question
Reply #1 - Apr 16th, 2009, 8:21am  
Test for the size of the returned array:
Code:

if (Serial.list().length > 0) {
  //then go ahead
} else {
  //none available
}
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Jassper
Re: Serial.list question
Reply #2 - Apr 16th, 2009, 8:39am  
NoahBuddy wrote on Apr 16th, 2009, 8:21am:
Test for the size of the returned array:
Code:

if (Serial.list().length > 0) {
  //then go ahead
} else {
  //none available
}


Hay thanks, why can I not find length in the referance, or the srial lib?
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PhiLho 
Re: Serial.list question
Reply #3 - Apr 16th, 2009, 9:48am  
Jassper wrote on Apr 16th, 2009, 8:39am:
why can I not find length in the referance, or the srial lib
Serial.list() returns a Java array. length is a standard feature / property of these arrays.
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Jassper
Re: Serial.list question
Reply #4 - Apr 16th, 2009, 10:04am  
PhiLho  wrote on Apr 16th, 2009, 9:48am:
Jassper wrote on Apr 16th, 2009, 8:39am:
why can I not find length in the referance, or the srial lib
Serial.list() returns a Java array. length is a standard feature / property of these arrays.

Ah ok, I don't know enough about all this, just enough to get in trouble  Cheesy
But I learn fast  Cool
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