Help: Runtime Error when loading ".pyd" module

[Terry Tang]

Hi There,

We are extending Python interpreter to support  special functions of our
tools. What we did is to compile Python's source code (which is got from the
an installation on a Linux environment for Python 2.3.3) and our extensions
(C++ code) on Windows with Microsoft Visual C++ 6.0 compiler to generate the
extended Python interpreter.

It works well on Linux and for the basic Python modules and our special
modules on Windows. But whenever a ".pyd" module is loaded by a statement
like the following:
import socket; # which finally calls:  import _socket
or
import Tkinter; # which finally calls: import _tkinter
or
import datetime
it hits a "Runtime Error" (which is shown in a message box saying "abnormal
program termination") and a message like the following is printed in the
console:
Fatal Python error: Interpreter not initialized (version mismatch?)


I tried to use Microsoft Visual Studio to debug the program and set a
breakpoint at "Py_FatalError()", but the breakpoint is not hit. I also
traced the loading process of the ".pyd" file in function
"_PyImport_LoadDynamicModule()": the ".pyd" file is correctly located and
loaded, and its "init" function seems be got correctly, but when the
initialization function is called, the above error happens.

I am pretty sure that Python is initialized by "Py_Initialize()", and the
".pyd" files are from the standard Python installation with the same version
(2.3.3).

Does anyone have any idea about the crash? Does the initialization function
from a ".pyd" file require special environment?

Because the ".pyd" files (like "_socket.pyd", _tkinter.pyd" and
"datetime.pyd" etc) are precompiled and contained in the Python installer
for Windows, I don't know how to manually compile them and debug them.

I appreciate your help in advance.

-Terry


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Re: Runtime Error when loading ".pyd" module

[Terry Tang]

Fredrik,

Thanks, the information is very helpful, and I have resolved our problem. I
was not aware that the .pyd files will load pythonNN.dll.

Regards.

-Terry


- Original Message - 
From: "Fredrik Lundh" <[EMAIL PROTECTED]>
To: 
Sent: Thursday, March 02, 2006 12:53 AM
Subject: Re: Runtime Error when loading ".pyd" module


> Terry Tang wrote:
>
> > it hits a "Runtime Error" (which is shown in a message box saying
"abnormal
> > program termination") and a message like the following is printed in the
> > console:
> > Fatal Python error: Interpreter not initialized (version mismatch?)
>
> both the main executable (e.g. python.exe or your own application)
> and the various PYD files are linked against the Python core DLL (e.g.
> python24.dll), and this error typically indicates that the PYD picks up
> another copy of that DLL than the EXE is using.
>
> e.g.
>
> 1. python.exe starts
> 2. when python.exe needs python24.dll, the runtime linker finds
> /foo/bar/python24.dll and loads it
> 3. python.exe initializes the python24.dll instance
> 4. python.exe starts your python program
> 5. your python program imports the foobar module
> 6. python.exe loads /foo/modules/foobar.pyd for you
> 7. when foobar.pyd needs python24.dll, the runtime linker finds
> /flub/python24.dll before /foo/bar/python24.dll
> 8. foobar.pyd calls /flub/python24.dll, which notices that it hasn't
> been properly initialized, and terminates.
>
> another possible option is that foobar.pyd is from an earlier python
> version, so you get
>
> 7. when foobar.pyd needs python23.dll, the runtime linker finds
> /foo/bar/python23.dll and loads it
> 8. foobar.pyd calls /foo/bar/python23.dll, which notices that it
> hasn't been properly initialized, and terminates.
>
> but the PYD loader used in step 6 has extra logic in it to attempt
> to detect this case (it checks what python DLLs a PYD file is using
> before it loads the PYD), so you usually get a better error message
> if this is the case.
>
> anyway, the first thing to do is to look for stray pythonXX.dll files
> ("python23.dll" in your case).
>
> hope this helps!
>
> 
>
>
>
>
>

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