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explain STATUS_DLL_NOT_FOUND

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mejrs 2023-02-22 23:30:19 +01:00
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guide/src/faq.md
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@ -180,3 +180,15 @@ done with the `crate` attribute:
#[pyo3(crate = "reexported::pyo3")]
struct MyClass;
```
## I'm trying to call Python from Rust but I get `STATUS_DLL_NOT_FOUND` or `STATUS_ENTRYPOINT_NOT_FOUND`!
This happens on Windows when linking to the python DLL fails or the wrong one is linked. Your `PATH` variable should contain something like...
```text
C:\Users\<You>\AppData\Local\Programs\Python\Python310
```
This directory should have, for Python 3.10, the files `python3.dll` and `python310.dll`. If you have made any changes to your `PATH` or installed things recently, try restarting your shell - any changes will not affect already open shells.
Failing that, you can use [Dependency Walker](https://www.dependencywalker.com/) to diagnose linking errors.