Question

I created a VC++ console project with Visual Studio and it auto-generated this function:

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[]) { ... }

I was just wondering what envp stands for and how/when I can/should use it?

Thank you!

Answer 1

The envp argument above will store the environment variables.

The envp array, which is a common
extension in many UNIX® systems, is
used in Microsoft C++. It is an array
of strings representing the variables
set in the user’s environment. This
array is terminated by a NULL entry.
It can be declared as an array of
pointers to char(char *envp[ ]) or as
a pointer to pointers to char(char
**envp). If your program uses wmain instead of main, use the wchar_t data
type instead of char. The environment
block passed to main and wmain is a
“frozen” copy of the current
environment.

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