[Boost-users] read_graphml: read more than 1 graph from the same graphml file

Subject: [Boost-users] read_graphml: read more than 1 graph from the same graphml file
From: Bartha Attila (abartha_at_[hidden])
Date: 2012-11-15 08:43:06

Thank You. I will look at it.



________________________________
 From: Jeremiah Willcock <jewillco_at_[hidden]>
To: "boost-users_at_[hidden]" <boost-users_at_[hidden]> 
Sent: Monday, November 12, 2012 11:32 PM
Subject: Re: [Boost-users] read_graphml: read more than 1 graph from the same graphml file
 
On Mon, 12 Nov 2012, Bartha Attila wrote:

> Hello !
> 
> Is there a way a to read more than one graph from a .graphml file using read_graphml ?
> Here's what I tried:
> -open an input stream to the graphml file;
> -call a function to read the graph from the file (the function uses read_graphml) and print the graph to stdout;
> -call the same function again, hoping that the second graph from the file will be read;
> -close the file input stream.
> 
> If I call the function once, it works fine and returns the first graph defined in the graphml file.
> If I call the function the twice, I get the following runtime exception:
>  'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::property_tree::ptree_bad_
> path> >'
>  what():  No such node (graphml)

I just added this feature to the trunk in response to your question. There is now an extra parameter to read_graphml to give the zero-based index of the graph you want within the file.  That isn't ideal if there are a lot of graphs in the file, but it's more reliable than what is there now.

-- Jeremiah Willcock
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