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cgraphviz

How to get the node name with Graphviz and libcgraph?

I'm trying to update some old code which used to work with Graphviz 2.26 and iterated over all the nodes of a graph and did something with their names:

for (Agnode_t *n = agfstnode(graph); n; n = agnxtnode(graph, n)) {
    ... use n->name ...
}

However in recent (2.30+?) versions of Graphviz, cgraph library is used for node representation and it doesn't have name field in its Agnode_t struct.

I know about agnode() function which allows to lookup the node by name, but there doesn't seem to be any function to go in the other direction. Am I missing something or is there really no way to access the name of the existing node with cgraph?

Solution

  • You can use the function agnameof, which is listed in the "Generic Objects" section of the cgraph manpage:

    char      *agnameof(void*);