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  Problem reading chars 128-159  (Read 1355 times)
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Offline kidluff

Senior Newbie





« Posted 2007-04-11 01:56:58 »

Hoping this is will be a simple problem  Wink

Using BufferedReader.read() to read a file char by char, I came across a problem when reading the characters 128-159

Here's an image of what I mean:
http://i14.photobucket.com/albums/a326/kidluff/Clipboard02.png

I found out that 128-159 have something to do with the Win32-system-thing, is there a way to fix this?
Offline Riven
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« Reply #1 - Posted 2007-04-11 17:48:49 »

Readers use charsets to convert the byte(s) into a char. When a char requires more than 8 bits, you have to use the highest bit to flag that a 2nd (or a 3rd) byte should be read. So you can only have 7 bits of data in each byte. Above 127, the 8th bit if 1, which makes the char-decoder think a second byte should be read, which is does, resulting in the larger-than-expected value. If you just want to read the bytes, don't use a reader, but an InputStream.

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Offline asc

Senior Newbie





« Reply #2 - Posted 2007-04-11 19:14:38 »

It doesn't look as simple as that because he has the correct number of outputs. But it does look like a charset issue; Windows-1252 and ISO-8859-1 are different in that range. I suggest you specify a charset when creating the InputStreamReader that you pass to the BufferedReader.
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Offline SimonH
« Reply #3 - Posted 2007-04-11 19:47:54 »

Have you tried BufferedReader.read(char[] cbuf, int off, int len) then examining the cbuf array?


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Offline Riven
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« Reply #4 - Posted 2007-04-11 20:10:37 »

And that should do?

effectively (not implementated that way) it just calls read() len-times.

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