How to write to file (with the last write on the top)

[Kaz32]

Hi, I want to make debug / log file, but I want to write it with the last write on the top of the file.
How to do that?

Thanks

[vineet.jain]

Using RFile ::TInt Write(TInt aPos, const TDesC8 &aDes);, you can specify aPos to be 0. If that doesn't suits your requirement then RFile::Seek() may also be used & then write to file.

[pooja_1650]

RFile::Write(TInt aPos, const TDesC8 &aDes, TInt aLength) can help you. Try giving the value of aPos as 0.

EDIT: Sorry, I just posted without having a refresh of page. So, duplicate answer.

[Kaz32]

Using RFile ::TInt Write(TInt aPos, const TDesC8 &aDes);, you can specify aPos to be 0. If that doesn't suits your requirement then RFile::Seek() may also be used & then write to file.

Thanks for your answer vineet, I will try it

RFile::Write(TInt aPos, const TDesC8 &aDes, TInt aLength) can help you. Try giving the value of aPos as 0.

EDIT: Sorry, I just posted without having a refresh of page. So, duplicate answer.

Nevermind pooja, two answer is better than one )
thanks for your answer

[Kaz32]

Using RFile ::TInt Write(TInt aPos, const TDesC8 &aDes);, you can specify aPos to be 0. If that doesn't suits your requirement then RFile::Seek() may also be used & then write to file.

I try RFile::Write(0, const TDesC8 &aDes), but the old log is replaced by the new log
I want keep the old log too..
How to do that?

Thanks

[pooja_1650]

If you are using Create(), then it will replace the old contents with new one, so try using Replace() (if you are not using it till now).

[Kaz32]

I'm already using Replace at constructL

So what I'm doing is something like this

void CMyClass::ConstructL()
   {
   ...
   iFileLog.Replace(CEikonEnv::Static()->FsSession(), _L("C:\\data\\Log.txt"), EFileWrite | EFileShareAny);
   ...
   }
void CMyClass::WriteLog(const TDesC8& aText)
   {
   iFileLog.Write(0, aText);
   }

when I call function WriteLog twice... the log on first call replaced by the new log

[vineet.jain]

Try utilizing the seek() then, like this:

void CMyClass::WriteLog(const TDesC8& aText)
{
RFs fs;
RFile file;
User::LeaveIfError(fs.Connect());
User::LeaveIfError(file.Open(fs, _L("C:\\data\\Log.txt"), EFileWrite));

TInt pos = 0;
file.Seek( ESeekStart, pos);
file.Write( aDes);

file.Close();
fs.Close();
}

[wizard_hu_]

RFile::Replace always ends up with a brand new empty file, replacing any possible existing one.
There is no one-liner for keeping the old data, you need to combine Open and Create. If one of them fails, try the other. I found such code in #13 of http://www.developer.nokia.com/Commu...-this-function

[wizard_hu_]

Just noticed that you want to have the most recent line at the top.
Something like

2011-12-27 Log File created

then

2012-01-01 New Year
2011-12-27 Log File created

Text files do not support "insert" operation, so for this case the closest thing you can do is re-writing the entire file having the new line written first. Note that this approach costs a lot of memory and/or a lot of time and also causes significant wear to the flash memory of the devices.
I do not suggest it in short. If you need the functionality for comfort reasons, it is a better choice to create a viewer application which can show you the log file in reverse order.

[Kaz32]

Thanks wizard_hu_, maybe I just ignore this try (yes, this functionality for comfort reason)
And keep writing like usually... the last log in the bottom

Thanks