Re: New and old Files version

Manuel,

Our principle is to provide back compatibility with files generated at any time in the past,
ie ROOT5.17 must be able to read files written with ROOT1.00 written 10 years ago.
Forward compatibility is more difficult to achieve, ie being able to read files written with a new version and read them with an old version. This will typically works across two production releases. I have tested for example that files generated with version 5.17 can be read with version 4.04 (ie 5 production releases ago), but these files cannot be read by version 4.00 because we introduced a new compression algorithm in 4.04.

Rene Brun

Manuel Mussini wrote:
>
> Hi,
>
> how can I create a file with version 5.17.02 (Windows) and use it
> under 4.00/08 (Linux)?
>
> I only need to save a TH1D on it!
>
> Creating the file with:
>
> outputFile = new TFile("K0sL020071204.root", "RECREATE");
>
> or:
>
> outputFile = new TFile("K0sL020071204.root", "RECREATE", "", 0);
>
> I get this error while opening it under ROOT 4:
>
> R__unzip: error in header
>
> Is there a simple way to get what I want?
>
> Bye…
>
Received on Thu Dec 06 2007 - 12:59:15 CET