For an IOError the exception attribute 'filename' is set to
> the filename. With your example above
> self.renderer._renderer.write_png(str (filename)) is Agg
> C++ extension code The line fp = fopen(file_name, "wb");
> could be changed to something like if ((fp =
> fopen(file_name, "wb")) == NULL) throw Py::IOError("could
> not open file", filename);
> Does this look right John?
Right in principle, but not in practice.
For one thing, cxx strangely doesn't define an IOError. I don't know
if this is simply an oversight. Perhaps I'll file a bug on the sf
The larger problem is that the exception constructor doesn't accept
multiple args and concatenate them. It would be nice if it did.
I added a Printf class to mplutils to ease the burden of making printf
style strings in C++ to make better exceptions, and updated the
exceptions in the image, agg and ft2font extensions. The standard
if ((fp = fopen(file_name, "wb")) == NULL)
throw Py::RuntimeError( Printf("Could not open file %s", file_name).str() );