Windows安装程序，检查软件包是否存在

Question

Using windows, I can uninstall software via script/command line as follows:

msiexec /x {00000000-0000-0000-0000-000000000000}

Is there a method to just test for the existence of the given package, without affecting it?

I'm interested in a true/false or any other input, indicating whether the package exists on the machine, and can be removed using Windows installer with the given command.

For context: I'm using NSIS, and need to modify my installer behavior in case a specific package is found. Command-line can be used as it can return values, and VBScript can be used via cmd as well.

Absolutely no affect on the package is mandatory, and also no indication of the process to the user, so repair isn't acceptable for example.

Answer 1

The "proper" way to find this out is to call a function such as MsiQueryProductState . This is available in various other fashions including the VB-accessible Installer.ProductState property . If instead you're trying to generate a list of what is on the machine, MsiEnumProducts or Installer.Products (or their Ex variants) are more appropriate. It appears that PowerShell can access equivalent information through WMI calls.

Less proper approaches would include calling msiexec /f {PROD-UCT-CODE} to either repair the product or fail to find it, or querying the registry directly for the presence of the product's Uninstall key entry, (it's subkey name matches the {PROD-UCT-CODE} ; check both 32-bit and 64-bit keys as well as both per-machine and per-user installations as required) for example with reg query .