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Index › Programming Questions & Help › Other Libraries › Recording serial stream
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Recording serial stream (Read 1059 times)
soulid1
Recording serial stream
Nov 23rd, 2009, 12:30am  
Hi,
I do want to record the serial stream coming from arduino to a file. I found "saveStream(targetFilename, sourceLocation)
" describtion in the Reference, but it doesn't work.

I opened a empty file in C:\ and named it test.txt

The code I used was:
Code:
saveStream(test.txt, c:\)


I tried several other syntax but couldn't get it running. What did I do wrong?
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PhiLho 
Re: Recording serial stream
Reply #1 - Nov 23rd, 2009, 4:24am  
These parameters are strings. You have to put them between double quotes:
saveStream("test.txt", "c:\\")
Notice also the doubled backslash. You could have written also "C:/".
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soulid1
Re: Recording serial stream
Reply #2 - Nov 23rd, 2009, 7:23am  
Ahhh- now somthing is happening.

Unfortunately is creates an empty file everytime the line of code is executed. The file names are something like

Code:
test.txt2177642737759354087.tmp
test.txt926895826807246688.tmp
test.txt4216974103557002931.tmp
test.txt7871416774013919003.tmp
test.txt789356447962487591.tmp
test.txt8426553106928063825.tmp
test.txt4183177127317637710.tmp
test.txt5447273698457453285.tmp


This is not what should happen Embarrassed
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PhiLho 
Re: Recording serial stream
Reply #3 - Nov 23rd, 2009, 9:14am  
Actually, I was always perplexed by this function, failing to understand its usage... The terse explanation in the reference page doesn't help much...

So I searched this function name (with top search box), and the first forum link (saveStream troubles) was enlightening: apparently, its canonical usage is to save on disk a file fetched from the network (eg. Internet).

The reference page says: "Save the contents of a stream to a file in the sketch folder. This is basically saveBytes(blah, loadBytes()) [...]" and "saveStream(targetFilename, sourceLocation)
targetFilename        String: name of the file to write to
sourceLocation      String: location to save the file"

I think it should state: "Save the contents of a stream loaded from given location to a file in the sketch folder. This is basically saveBytes(targetFilename, loadBytes(sourceLocation)) [...]" and "saveStream(targetFilename, sourceLocation)
targetFilename        String: name of the file to write to
sourceLocation      String: location to get the data from"

I will report this thread in the documentation fix suggestions forum. [Done: saveStream confusing description]

In short, I don't think this function is what you need...
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