Using detectEncodingF romByteOrderMar ks while copying a text file

[Claire]

I've noticed after copying a text file line by line and comparing, that the
original had several bytes of data at the beginning denoting its encoding.
How do I use that in my copy?
My original code shown below, didn't produce a perfect copy, so I used the
StreamReader construct that includes detectEncodingF romByteOrderMar ks. But I
need to pass that to the construct for my StreamWriter so I need to be able
to work out the encoding type somehow. How please?

string InputPath = Path.GetDirecto ryName(Applicat ion.ExecutableP ath) +
@"\intext.tx t";
string OutputPath = Path.GetDirecto ryName(Applicat ion.ExecutableP ath)
+ @"\outtext.txt" ;
string In;
string Out;

using (StreamReader Input = new StreamReader(In putPath))
// using (StreamReader Input = new StreamReader(In putPath, true)) <<
construct
{
using (StreamWriter Output = new StreamWriter(Ou tputPath))
{
while ((In = Input.ReadLine( )) != null)
{
Out = DoSomethingTo(I n);
Output.WriteLin e(Out);
}
}
}

[Marc Gravell]

I'm guessing - tell the writer about it?

using (StreamWriter Output = new StreamWriter(Ou tputPath, false,
Input.CurrentEn coding)) {...}

Marc

[Marc Gravell]

Correction - the CurrentEncoding is not valid until it has read some
data; perhaps something like below; note that it also can't detect every
encoding possible...

Marc

using (StreamReader reader = new StreamReader(pa th1, true))
{
string line = reader.ReadLine ();
using (StreamWriter writer = new StreamWriter(pa th2, false,
reader.CurrentE ncoding))
{
Console.WriteLi ne("Reading {0} with {1}", path1,
reader.CurrentE ncoding.Encodin gName);
Console.WriteLi ne("Writing {0} with {1}", path2,
writer.Encoding .EncodingName);

while (line != null)
{
string t = Transform(line) ;
Console.WriteLi ne(t);
writer.WriteLin e(t);
line = reader.ReadLine ();
}
}
}

[Claire]

"Marc Gravell" <ma**********@g mail.comwrote in message
news:u4******** ******@TK2MSFTN GP03.phx.gbl...

Correction - the CurrentEncoding is not valid until it has read some data;
perhaps something like below; note that it also can't detect every
encoding possible...

That's great! thank you :)

[Mihai N.]

Using detectEncodingF romByteOrderMar ks while copying a text file

Unless you process the text somehow, it is not worth the trouble to
copy a text file as text file (with encoding detection, line ending,
and so on).
Just copy it as a binary. The routine can also be reused for any type
of files, and there is no risk of data corruption if you "guess" the
encoding wrong.
--
Mihai Nita [Microsoft MVP, Visual C++]
http://www.mihai-nita.net
------------------------------------------
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[Marc Gravell]

I very nearly said the same thing - but if you look carefully, there is
a transform hidden in the code:

Out = DoSomethingTo(I n);
Output.WriteLin e(Out);

Marc

[Mihai N.]

I very nearly said the same thing - but if you look carefully, there is

a transform hidden in the code:

Right, I missed that one. Got fouled by the subject :-)
--
Mihai Nita [Microsoft MVP, Visual C++]
http://www.mihai-nita.net
------------------------------------------
Replace _year_ with _ to get the real email