How to fix this dll loading python error?

Question

I use one c++ dll in my python code. When I run my python app on my computer, it works fine but when I copy all to another computer this happen:

Traceback (most recent call last):
 File "C:\users\Public\SoundLog\Code\Código Python\SoundLog\SoundLog.py", line 9, in <module>
   from Auxiliar import *
 File "C:\users\Public\SoundLog\Code\Código Python\SoundLog\Auxiliar\DataCollection.py", line 4, in <module>
   import SoundLogDLL
 File "C:\users\Public\SoundLog\Code\Código Python\SoundLog\Auxiliar\SoundLogDLL.py", line 4, in <module>
   dll = cdll.LoadLibrary(os.environ['PUBLIC'] + "\\SoundLog\\DLLs\\ForPython\\SoundLogC++WrapperDLL.dll")
 File "C:\Python26\lib\ctypes\__init__.py", line 431, in LoadLibrary
   return self._dlltype(name)
 File "C:\Python26\lib\ctypes\__init__.py", line 353, in __init__
   self._handle = _dlopen(self._name, mode)
WindowsError: [Error 14001] The application has failed to start because its side-by-side configuration is incorrect. Please see the application event log or use the command-line sxstrace.exe tool for more detail

How can I fix this problem so that my python app work in every computer?

Note: I only need them to work on windows 7 like mine. And I tested on another win7 computer (both 32bits).

Answer 1

You're using a DLL which depends on a Microsoft Visual C++ runtime which isn't installed on the target computer. You have a few options:

• Install or copy the Visual C++ runtime libraries to the target computer. Installation is done by adding merge modules to your installer (if you have one) or by running the redistributable installer ( vcredist.exe ). The various methods are documented here for VS2005 (other versions will be similar).

• If you built the DLL, you can change the project settings to statically link the runtime libraries. See this answer to see how this is done.