file i/o in java

[amk]

Does anyone have example code for how to open and write to a text file on the cRIO? We would like to write out information while the robot for debugging purposes, then ftp the file to a laptop for viewing. Any help is appreciated.

[Robototes2412]

if i remember right, they removed that feature from java, i suggest writing a class in c++ then use JNA to call it

[rrossbach]

Originally Posted by amk

Does anyone have example code for how to open and write to a text file on the cRIO? We would like to write out information while the robot for debugging purposes, then ftp the file to a laptop for viewing. Any help is appreciated.

Take a look at my post here for an example.

- Ron
Team #2607 controls mentor

[derekwhite]

I'll second Ron's approach.

As an FYI, once you have an OutputStream to the file, you can wrap it with a PrintStream and use the typical print methods on the file.

PrintStream out;
DataOutputStream theFile;
FileConnection fc;

try {
fc = (FileConnection)Connector.open("file:///output.txt", Connector.WRITE);
fc.create();
theFile = fc.openDataOutputStream();
out = new PrintStream(theFile);
} catch (Exception e) {
...
}

[spartango]

See
http://code.google.com/p/grtframewor...GRTFileIO.java

You can use that file verbatim or copy it and use its innards in your code.

[Robototes2412]

THanks, is there anyway to append to a file?