TraceListener in win32 application?

[John Batdorf]

Ugh. I obviously don't understand the correct way to use this thing!
I have several #if(DEBUG) code blocks to write to a file ErrorLog.txt
to troubleshoot why and what exceptions are being encountered.

So in my class this is defined:

static FileStream traceLog = new FileStream("Err orLog.txt",
FileMode.OpenOr Create, FileAccess.Writ e);

static TextWriterTrace Listener traceListener = new
TextWriterTrace Listener(traceL og);

then in the same class I have this method

private static void Logger(string errorMessage)
{
// Create a text file to write messages to
// Create a TextWriterTrace Listener
//TextWriterTrace Listener traceListener = new
TextWriterTrace Listener(traceL og);
// Add the traceListener to the Trace.Listeners collection
Trace.Listeners .Add(traceListe ner);
Trace.WriteLine (errorMessage);
//Trace.Listeners .Remove(traceLi stener);
Trace.Flush();
}

At various places in my program... I make this call:

Logger("Excepti on thrown from Logout()");
Logger(ex.Messa ge.ToString());

And here's the problem! My file, the first time Logger is called no
problem errorMessage is written to the file.
the second time it's called, it creates two entries of the
errorMessage to the file. The third time... you get the point.

Here's a sample file: (each of the items only happened once, but was
written multiple times)
MAILSERVER=some configfilesetti ng
Connection Made
Connection Made
Login Success
Login Success
Login Success
MailCount = 0
MailCount = 0
MailCount = 0
MailCount = 0
Ideas? I can't figure out why this is happening... when stepping into
the debugger, I don' see this data replicated, and I'm not seeing it
written duplicate

[David Browne]

"John Batdorf" <jo*********@ho tmail.com> wrote in message
news:a9******** *************** ***@posting.goo gle.com...

Ugh. I obviously don't understand the correct way to use this thing!
I have several #if(DEBUG) code blocks to write to a file ErrorLog.txt
to troubleshoot why and what exceptions are being encountered.

So in my class this is defined:

You only add the TraceListener once.
If you add it a second time, then Trace.WriteLine will call it twice.

Looks like this is really a code organization problem. You need to run some
setup code before you static methods will work. You need a static
constructor:
class MyType()
{
static MyType()
{
System.IO.Strea mWriter sw =
new
System.IO.Strea mWriter("Errors .txt",false,Sys tem.Text.Encodi ng.ASCII);
sw.AutoFlush = True;
TextWriterTrace Listener tl = new TextWriterTrace Listener(sw);
Trace.Listeners .Add(tl);
}
private static void Logger(string errorMessage)
{
Trace.WriteLine (errorMessage);
}

}
David

[John Batdorf]

Thanks I realized this, and actually ended up implementing a different
way, but I really appreciate the quick responses.

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