16.3. Getting and Setting Environment Strings

Environment variables often contain information that is useful during the execution of a program. For example, you might want to retrieve the current path so that you can search it for a specific directory name. To retrieve environment variables, use theExpandEnvironmentString function, as shown in Listing 16.3.

Code Listing 16.3. Using the ExpandEnvironmentString function
// siees.cpp

#include <windows.h>
#include <iostream.h>

void main()
{
   char s[1000];
   DWORD result;
   
   result = ExpandEnvironmentStrings("%path%",
      s, 1000);
   if (result == 0)
   {
      cout << "Error: " << GetLastError() << endl;
      return;
   }
   cout << s << endl;
}

The function accepts a string containing one or more environment variable names ...

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