Help for running the hello world tutorial!

C++ coding using Panda3D
#1

Hi all!

I have found a serious issue while trying to run the “hello world” application using C++ under Ubuntu Karmic Koala.

I have done the following:

First, I have installed the required .deb package for Ubuntu Karmic.

Then, I have created a file named “demo.cxx” with the following code:

#include "pandaFramework.h"
#include "pandaSystem.h"
 
PandaFramework framework;
 
int main(int argc, char *argv[]) {
    //open a new window framework
  framework.open_framework(argc, argv);
    //set the window title to My Panda3D Window
  framework.set_window_title("My Panda3D Window");
    //open the window
  WindowFramework *window = framework.open_window();
 
  //here is room for your own code
 
    //do the main loop, equal to run() in python
  framework.main_loop();
    //close the window framework
  framework.close_framework();
  return (0);
}

I have tried to compile this code using the following sentence in the command line:

g++ -c demo.cxx -o demo.o -fPIC -O2 -I/{usr/include/python2.6} -I{/usr/include/panda3d}

(I have checked it and the required libraries are there.)

However, after running this I get the following error:

demo.cxx:1:28: error: pandaFramework.h: No such file or directory
demo.cxx:2:25: error: pandaSystem.h: No such file or directory
demo.cxx:4: error: ‘PandaFramework’ does not name a type
demo.cxx: In function ‘int main(int, char**)’:
demo.cxx:8: error: ‘framework’ was not declared in this scope
demo.cxx:12: error: ‘WindowFramework’ was not declared in this scope
demo.cxx:12: error: ‘window’ was not declared in this scope

Any idea about how to fix this issue?

Many thanks for your help!

#2

Clearly it’s not finding pandaFramework.h, which is the first of many Panda header files. Is that file to be found in /usr/include/panda3d?

David

#3

Yes, I guess you are right!

I have tried to solve this changing the command to:

g++ -c demo.cxx -o demo.o -fPIC -O2 -I/usr/include/python2.5 -I/usr/include/panda3d

But this creates a even longer error list. I’m copying below just a few of the first lines:

In file included from /usr/include/panda3d/cycleData.h:19,
                 from /usr/include/panda3d/pandaNode.h:20,
                 from /usr/include/panda3d/nodePath.h:20,
                 from /usr/include/panda3d/windowFramework.h:19,
                 from /usr/include/panda3d/pandaFramework.h:20,
                 from demo.cxx:1:
/usr/include/panda3d/typeHandle.h:69:20: error: Python.h: No existe el fichero ó directorio
In file included from /usr/include/panda3d/cycleData.h:19,
                 from /usr/include/panda3d/pandaNode.h:20,
                 from /usr/include/panda3d/nodePath.h:20,
                 from /usr/include/panda3d/windowFramework.h:19,
                 from /usr/include/panda3d/pandaFramework.h:20,
                 from demo.cxx:1:
/usr/include/panda3d/typeHandle.h:106: error: ISO C++ forbids declaration of ‘PyObject’ with no type
/usr/include/panda3d/typeHandle.h:106: error: expected ‘;’ before ‘*’ token
In file included from /usr/include/panda3d/dSearchPath.h:20,
                 from /usr/include/panda3d/configPageManager.h:20,
                 from /usr/include/panda3d/configVariableCore.h:20,
                 from /usr/include/panda3d/configVariableBase.h:20,
                 from /usr/include/panda3d/configVariable.h:19,
                 from /usr/include/panda3d/configVariableEnum.h:19,
                 from /usr/include/panda3d/notifyCategory.h:21,
                 from /usr/include/panda3d/notifyCategoryProxy.h:20,
                 from /usr/include/panda3d/config_express.h:19,
                 from /usr/include/panda3d/referenceCount.h:23,
                 from /usr/include/panda3d/nodeReferenceCount.h:20,
                 from /usr/include/panda3d/cycleData.h:20,
                 from /usr/include/panda3d/pandaNode.h:20,
                 from /usr/include/panda3d/nodePath.h:20,
                 from /usr/include/panda3d/windowFramework.h:19,
                 from /usr/include/panda3d/pandaFramework.h:20,
                 from demo.cxx:1:
/usr/include/panda3d/filename.h:70: error: ISO C++ forbids declaration of ‘PyObject’ with no type

I think that the issue it is caused because of python-dev not being installed but, since Ubuntu has Python installed by default and this package is not available in Synaptic, I can not imagine how to fix it.

Any ideas?

#4

Ubuntu has python installed by default, but not python-dev. On my Ubuntu machine I can just ‘apt-get install python-dev’ and down it comes.

David

#5

Exactly!!!

I just needed to use the command:

sudo apt-get install python-dev

…and after a while, I could compile the program with:

g++ -c demo.cxx -o demo.o -fPIC -O2 -I/usr/include/python2.6 -I/usr/include/panda3d

…convert it into a executable with:

g++ demo.o -o demo -fPIC -L/usr/lib/panda3d -lp3framework -lpanda -lpandafx -lpandaexpress -lp3dtoolconfig -lp3dtool -lp3pystub -lp3direct

…and run it with:

./demo

It’s great! Thanks to all for your help!