TCanvas::Print to stdout

ROOT
1

Hi,

is it possible to Print a Canvas to standard output.

I would like to create a python(pyroot)-cgi script creating an image (png) of a canvas. I would like to avoid temporary files or pipes on a webserver.

Cheers

Felix

2

see TCanvas::Print to print a canvas in various formats

c1->Print("c1.gif"); etc same with ps,pdf,jpf,
Just in case you do not know, instead of running an unsecure cgi-script on a web server, you better access your ROOT files via http

TFile *file = TFile::Open("http>//xxx.yy.zz/myfile.root"); and proceed as if the file was local (TBrowser, scripts, etc)

Rene

3

Hi, use
root.cern.ch/root/html/TASImage. … ge:FromPad]
and then
root.cern.ch/root/html/TASImage. … mageBuffer

Regards. Valeriy

4

@rene: The problem is different. I do not have a root file. The images should be created directly from a query from a database. So I cannot circumvent the scripts.

@Valeriy: I am not sure how this converts to pyroot. The solution I found is giving /dev/fd/1 as filename. This is linux-specific, but should do for the moment.

Thank you for your hints!

Felix