_tgetenv_s example
It is used to get a value of a particular environmental variable. Syntax: errno_t _tgetenv_s( size_t *pReturnValue, char* buffer, size_t numberOfElements, const char *varname ); Parameters: pReturnValue: The buffer size that is required to store the variable buffer: Buffer in which the value of the environmental variable will be stored numberOfElements: Size of Buffer varname: Name of the Environmental Variable. Example: #include "stdafx.h" #include <stdio.h> #include <stdlib.h> int _tmain(int argc, _TCHAR* argv[]) { size_t requiredSize; TCHAR *value; _tgetenv_s(&requiredSize, NULL, 0, _T("SystemRoot")); printf("Size of the buffer required is %d\n", requiredSize); value = (TCHAR *)malloc(requiredSize * sizeof(TCHAR)); _tgetenv_s(&requiredSize, value, requiredSize, _T("SystemRoot")); printf("Value of SystemRoot Environmental Variable:%ls\n", value); return 0...