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Originally Posted by mrklempae
So we can write to a text file
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Yes.
Don't ignore smart dashboard though. I really think it will be better for you to try that first. Smart dashboard is useful for debugging, but can also be used during a competition match to show information on your driver station.
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we can't read it unless we FTP the file
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Yes.
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we need to use the Preferences class to create and access it
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No. You can use standard file I/O routines to open and write to files. We use C stdio which looks like this:
Code:
#include <stdio.h>
...
FILE *output = fopen("/3322-output.txt", "w");
if (output) {
fprintf(output, "hello world\n");
fclose(output);
}
The file written above can be viewed with a web browser by visiting "ftp://10.te.am.2/3322-output.txt".
C++ stream I/O routines should also work, but I haven't tried. Can you post some working code if you get C++ streams working?
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can we still do complex tasks with the data such as reading comma separated values into an array?
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Yes.
The cRIO is an independent computer with its own files. The driver station is another independent computer. The cRIO and driver station use a limited network connection to communicate. If you want to share files between them you must copy them by FTP.
The only problem we've found using the cRIO file system with C is it will occasionally pause for up to 100ms to write data to permanent storage (flash storage). The C stdio routines I showed above buffer writes in memory. When the buffer fills up, it has to be written to permanent storage and that takes a long time.