Environment Variables
Every process has an environment block that contains a set of environment
variables and their values. The command processor provides the
set command to display its environment block or to create new environment
variables. Programs started by the command processor inherit the command processor's
environment variables.
By default, a child process inherits the environment variables of its parent
process. However, you can specify a different environment for the child process
by creating a new environment block and passing a pointer to it as a parameter
to the
CreateProcess function.
The
GetEnvironmentStrings function returns a pointer to the environment block of the calling process.
This should be treated as a read-only block; do not modify it directly. Instead,
use the
SetEnvironmentVariable function to change an environment variable. When you are finished with the
environment block obtained from
GetEnvironmentStrings, call the
FreeEnvironmentStrings function to free the block.
The
GetEnvironmentVariable function determines whether a specified variable is defined in the
environment of the calling process, and, if so, what its value is.
For more information, see the examples in
Changing Environment Variables.
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