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devel / comp.lang.python / Re: [winreg] How to access "(Default)" key value?

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* [winreg] How to access "(Default)" key value?Nicolas Formichella
`- Re: [winreg] How to access "(Default)" key value?MRAB

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[winreg] How to access "(Default)" key value?

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Subject: [winreg] How to access "(Default)" key value?
From: noulo...@gmail.com (Nicolas Formichella)
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 by: Nicolas Formichella - Tue, 3 May 2022 09:31 UTC

Hello,

I am encountering an issue with winreg, I can't figure out how to read the "(Default)" of a registry value

```
def get_chrome_version() -> str:
with winreg.ConnectRegistry(None, winreg.HKEY_CURRENT_USER) as registry:
with winreg.OpenKeyEx(registry, r"Software\Microsoft\Windows\CurrentVersion\App Paths\chrome.exe",
access=winreg.KEY_READ) as key:
value, _ = winreg.QueryValueEx(key, "(default)")
return value
```

Taking the example above it raises a FileNotFoundError :

```
Traceback (most recent call last):
File "C:/Users/noulo/dev/py/chromedriver_dl/main.py", line 14, in get_chrome_version
value, _ = winreg.QueryValueEx(key, "(default)")
FileNotFoundError: [WinError 2] The system cannot find the file specified
```

(Trying "Path" instead of "(Default)" works)

Although the value definitely exists as shown by Powershell

```
Get-Item -Path "HKCU:/Software/Microsoft/Windows/CurrentVersion/App Paths/chrome.exe" | Select-Object -ExpandProperty Property
```

Returns :

```
(default)
Path
```

Is this a bug I should report, or if not, what is the way, using winreg, to access the "(Default)" value of a key?

Regards,
Nicolas FORMICHELLA

Re: [winreg] How to access "(Default)" key value?

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Subject: Re: [winreg] How to access "(Default)" key value?
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 by: MRAB - Tue, 3 May 2022 16:46 UTC

On 2022-05-03 10:31, Nicolas Formichella wrote:
> Hello,
>
> I am encountering an issue with winreg, I can't figure out how to read the "(Default)" of a registry value
>
> ```
> def get_chrome_version() -> str:
> with winreg.ConnectRegistry(None, winreg.HKEY_CURRENT_USER) as registry:
> with winreg.OpenKeyEx(registry, r"Software\Microsoft\Windows\CurrentVersion\App Paths\chrome.exe",
> access=winreg.KEY_READ) as key:
> value, _ = winreg.QueryValueEx(key, "(default)")
> return value
> ```
>
> Taking the example above it raises a FileNotFoundError :
>
> ```
> Traceback (most recent call last):
> File "C:/Users/noulo/dev/py/chromedriver_dl/main.py", line 14, in get_chrome_version
> value, _ = winreg.QueryValueEx(key, "(default)")
> FileNotFoundError: [WinError 2] The system cannot find the file specified
> ```
>
> (Trying "Path" instead of "(Default)" works)
>
> Although the value definitely exists as shown by Powershell
>
> ```
> Get-Item -Path "HKCU:/Software/Microsoft/Windows/CurrentVersion/App Paths/chrome.exe" | Select-Object -ExpandProperty Property
> ```
>
> Returns :
>
> ```
> (default)
> Path
> ```
>
> Is this a bug I should report, or if not, what is the way, using winreg, to access the "(Default)" value of a key?
>
Use 'QueryValue' with an empty string:

value = winreg.QueryValue(key, "")

or None:

value = winreg.QueryValue(key, None)

1
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