## Environment access functions

The functions in this section allow to access (get) or change value of environment variables in a portable way. They are currently implemented under Win32 and POSIX-like systems (Unix).

Include files

<wx/utils.h>

wxGetenv
wxGetEnv
wxSetEnv
wxUnsetEnv

### wxGetenv

wxChar * wxGetEnv(const wxString& var)

This is a macro defined as `getenv()` or its wide char version in Unicode mode.

Note that under Win32 it may not return correct value for the variables set with wxSetEnv, use wxGetEnv function instead.

### wxGetEnv

bool wxGetEnv(const wxString& var, wxString *value)

Returns the current value of the environment variable var in value. value may be `NULL` if you just want to know if the variable exists and are not interested in its value.

Returns `true` if the variable exists, `false` otherwise.

### wxSetEnv

bool wxSetEnv(const wxString& var, const wxChar *value)

Sets the value of the environment variable var (adding it if necessary) to value.

Returns `true` on success.

### wxUnsetEnv

bool wxUnsetEnv(const wxString& var)

Removes the variable var from the environment. wxGetEnv will return `NULL` after the call to this function.

Returns `true` on success.