python37.dll not linked in executable

Question

I extended c++ with python but the exectuable won't run on systems that do not have python installed.

#include "C:\.....python.h"

int main()
{
    Py_Initialize();
    PyRun_SimpleString("print("hello world")\n")
Py_Finalize();
return 0;
}

When I run on a windows system without python installed I receive the following error:

The code execution cannot proceed because python37.dll was not found. Reinstalling the program may fix the problem.

How do I link python37.dll to the executable.

See static linking vs dynamic linking. You are linking dynamically; in order to do what you need, you need to statically link the python library (for Windows, this means using .lib, not .dll). — Amadan
– Amadan, Commented Dec 27, 2019 at 4:40
I've included the python libraries. (python37.lib) in "library directories" under VC++ Directories. — asd plougry
– asd plougry, Commented Dec 27, 2019 at 5:06
I'm not a Windows person, but maybe this can help? VS has a ton of options, and apparently not all .lib files are the same. — Amadan
– Amadan, Commented Dec 27, 2019 at 5:09
Your program is missing a part it needs for execution. What actually is your question? The error is clear, the remedy seems obvious but you don't ask a question. — Ulrich Eckhardt
– Ulrich Eckhardt, Commented Dec 27, 2019 at 10:26
How do I link python37.dll to the executable. Ulrich Eckhardt — asd plougry
– asd plougry, Commented Dec 27, 2019 at 11:05

selbie · Accepted Answer · 2019-12-27 08:18:04Z

1

Make sure your python folder is in your PATH so it can find the DLL in question.

From the command line:

c:\> set PATH=c:\python\python37;%PATH%
c:\> cd /d c:\path\to\your\exe
c:\path\to\you\exe> myprogram.exe

For more details about how DLLs are found and loaded read the Dynamic-Link Library Search Order page on MSDN

answered Dec 27, 2019 at 8:18

selbie

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asd plougry Over a year ago

So basically if the user's windows system does not have python3.7 installed it won't run?

rustyx · Accepted Answer · 2019-12-27 09:50:29Z

0

A DLL is by definition a dynamically linked library, it is a separate module that is looked up and resolved at run time.

If Python is not installed, your application won't run.

You need to either bundle Python with your application or install Python before/during your application installation.

Alternatively you can try linking with Python statically, in which case it will become part of the executable and won't need to be installed separately.

edited Dec 27, 2019 at 9:50

answered Dec 27, 2019 at 8:30

rustyx

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