Error in GraphViz Preview

[Beercow]

I keep getting an error in the preview pane. Error: gvwrite_no_z problem 229693494
If I run dot -Tpng PBTEMP.16972.81957.txt -o image.png from the command line, it produces a graph.

PBTEMP.16972.81957.txt

[jrebacz]

Hello Beercow,
Thanks for using the plugin and taking the time to raise this issue. I was able to preview PBTEMP.16972.81957.txt, and save a .png with the plugin, and Graphviz 2.38. The command "dot -Tpng PBTEMP.16972.81957.txt -o image.png" works fine for me too. I'd be curious to know how "dot -Tbmp PBTEMP.16972.81957.txt -o image.bmp" works on your end, because NppGraphviz uses "dot -Tbmp" to generate the preview.

I think the root cause is something in graphviz, since graphviz is forming the error message you mentioned:

https://github.com/ellson/graphviz/blob/master/lib/gvc/gvdevice.c

if ((olen = z->next_out - df)) {
ret = gvwrite_no_z (job, (char*)df, olen);
if (ret != olen) {
(job->common->errorfn) ("gvwrite_no_z problem %d\n", ret);
exit(1);
}
}

Looking at this file, it seems like the error is occurring while using ZLIB's streaming compression/uncompression functionality. 229693494 is probably the number of bytes (uncompressed) zlib is working with. That is also the size of the output .bmp file.

Thanks,
Jeff

[Beercow]

I'll have to let yu know tomorrow. I noticed it didn't occure with all of the rendering engines, just some. I know dot caused the error, which is what I wanted in thos case, but others worked fine. I'll get you a list of which ones caused the error.

[Beercow]

"dot -Tbmp PBTEMP.16972.81957.txt -o image.bmp" produces a bmp file just fine. The only layout engines I get the error in the GraphViz Preview pane are: dot, fdp, and circo. Not sure what the issue is.