Re: Reload Complete Environment

Ulrich Eckhardt <>
Thu, 25 Jun 2009 17:17:20 +0200
Martin T. wrote:

Ulrich Eckhardt wrote:

Martin T. wrote:

I guess one could write a function by reading the registry
(HKEY_CURRENT_USER\Environment +
Manager\Environment) and then calling SetEnvironment for each entry, but
that seems a bit hacky ... or doesn't it?

I'm wondering what it is that you are trying to achieve. I'm also

My specific case was the PATH environment variable, that gets changed by
a child process and I would like the parent process to reload PATH after
it has executed child. If I merge the HKCU and HKLM key myself and then
call SetEnvironmentVariable I may do something differently from the way
the Windows system handles this merging and therefore I'd need a
function to reload an environment variable or at least a function that
reads the current "global" PATH from the registry. (if such a function
exists, that is)

I see. I have no idea how to reload it, but I would perhaps look a bit into
the WM_SETTINGCHANGE window message, which is supposed to be used for
changes in the environment.

 > questioning the use of environment vars as communication channel in
 > general, though there are valid reasons for their use.

EnvVars sometimes seem to be a bit anachronistic, however they seem to
be quite the standard way of configuring global settings for command
line tools and more stuff. Also, the PATH variable is somewhat special,
or isn't it?

Right, this is one of the uses where they make sense and/or can't be helped.
Other cases are when you need to pass something to a child of a child
process (e.g. passing arguments to the compiler when invoking 'make' from
the shell prompt).

Apropos anachronistic: MS Windows CE doesn't have environment vars.

Good luck!


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