473,573 Members | 3,250 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

problems using graphviz perl module from apache (windows)

I'm writing a cgi script that uses graphviz (the dot program) to
generate a graph and I'm banging my head against the wall trying to get
it to work properly. Currently, if I run the script directly from the
command line, it will work properly and generate my graph (which gets
dumped into a file). If I invoke the script as a cgi script within
apache, it runs fine until it calls the as_png() function, at which
point it will die waiting for a result (the destination file is created
but is empty).

I'm running SERVER_SOFTWARE ="Apache/2.0.52 (Win32)"
and version 1.8 of the GraphViz module. If I run a printenv.cgi, I get
the following path:

PATH="C:\Progra m Files\Perl\bin\ ;C:\Program Files\Reflectio n;C:\PROGRAM
Files\Java\j2re 1.4.2_01\bin;C: \WINNT\system32 ;C:\WINNT;C:\WI NNT\System32\Wb em;C:\Oracle\or a81\bin;C:\Prog ram
Files\Oracle\jr e\1.1.7\bin;C:\ ISIS;C:\PROGRA~ 1\COMMON~1\MDL
Shared\ISIS;C:\ PROGRA~1\ATT\Gr aphviz\bin;C:\P ROGRA~1\ATT\Gra phviz\bin\tools "

which does seem to have the correct path settings for dot.exe.

The error that the apache log gives me is: Premature end of script
headers: simplegraph.pl

If I remove the line that calls as_png(), the script runs fine.

Any assistance would be most appreciated. I've searched usenet but to
no avail...



Jul 19 '05 #1
1 4717
Another piece of the puzzle: The CGI script *does* seem to be
correctly invoking the dot.exe program. However, dot.exe is running
forever and never comes back, which is why the cgi script remains
seemingly hung... I notice that graphviz.pm calls dot.exe using a
"run" command. I'm not familiar with it... Any hints?


Jul 19 '05 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

by: Nuno Paquete | last post by:
Hi group. How can I get PHP working under windows, with Apache web server? Where can I find the module? I suppose that I need to install a module like in Linux... Thanks in advance. Nuno Paquete
by: Piotr B. | last post by:
Hello, I want to make use of a Perl script "ora2pg" (Oracle to PostgreSQL schema converter), which requires the following modules: DBI, DBD::Oracle and DBD::Pg. As I don't use Perl on a regular basis, I've downloaded and installed ActivePerl (Windows). Then, I installed DBI and DBD::Oracle using the PPM utility. But,...
by: Griff | last post by:
Hi there I'm trying to run some CGI programs under Apache, written in C++, which use the "libmysqlclient" MySQL library. This is all running on Solaris. I build my programs using the following makefile: all: SCM exampleSQL
by: Envex Developments | last post by:
Hey guys, I have a need to install the DBD::Pg Perl module on many shared web servers, which do not have PostgreSQL installed. Then the DBD::Pg module will just connect to a remote PostgreSQL database, hosted elsewhere. I'm having some problems doing this. First off, I modified the Makefile.PL, and added the three following links just...
by: Envex Developments | last post by:
Hey guys, I have a need to install the DBD::Pg Perl module on many shared web servers, which do not have PostgreSQL installed. Then the DBD::Pg module will just connect to a remote PostgreSQL database, hosted elsewhere. I'm having some problems doing this. First off, I modified the Makefile.PL, and added the three following links just...
by: smritikapoor | last post by:
I am trying to connect to an https server using NNTP perl module. I have been able to connect to normal NNTP server using the NNTP perl module but cannot connect to an https server. Please help me with some information/code
by: samir.vds | last post by:
Hello everyone, I'm trying to test the tempfile module with the following script, which basically creates a temporary file, fills the file with some test data and prints it. import tempfile t = tempfile.TemporaryFile() t.write("lalalala")
by: Holger | last post by:
Hi I'm using python Serial from: http://switch.dl.sourceforge.net/sourceforge/pyserial/pyserial-2.4.tar.gz to implement ymodem and other protocols on the PC com port And it works like a charm in cygwin, but when I try to use it directly in python under windows using active state python installation, it says it's missing the module...
by: sbettadpur | last post by:
hello, I am trying to install the Text::NLP::Stanford::EntityExtract perl module on windows xp. But its not installing properly... can anybody tell solution for the above problem. But its installing successfully on Linux machine. The following error i was getting while installing.......
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. ...
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For...
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the...
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes...
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in...
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.