getenv() in FDK

[Guest]

Hello,

I am looking for how to get environment variables in FDK. I understand that in C has function: getenv( "PATH" ); however, I could not find the similar fuction in FDK. Any suggestion or comment, I would appreciate it.

Thank you,

Thai Nguyen

[anupambakshi]

Hi,

I'm looking for the same answer.

If I include a call to "genenv" Visual Studio 9 complains :

" error C2065: 'error' : undeclared identifier"

I've tried including <stdlib.h> and <cstdlib> but to no avail.

Am I missing a linker library?

Thanks,

Anupam

[Russ Ward]

Hi,

You haven't specified which version of Visual C++ you are using. For older versions, I've used this successfully:

#define DONT_REDEFINE

#include "stdlib.h"

StringT ws_getEnvVar(UCharT *var)

{
  UCharT *value;
  StringT returnStr;

  value = getenv(var);
 
  returnStr = F_StrCopyString(value);
  return returnStr;
}

In VC++ 9.0, it warns that getenv() may be obsolete and unsafe, so I use this now:

#define DONT_REDEFINE

#include "stdlib.h"

StringT ws_getEnvVar(UCharT *var)
{
  UCharT *value;
  StringT returnStr;

  errno_t err;

  err = _dupenv_s(&value, NULL, var);
  
  if(!err)
    returnStr = F_StrCopyString(value);
  else
    returnStr = F_StrCopyString("");

  free(value);

  return returnStr;

}

I'm not smart enough to fully understand the long-term consequencies of preventing the redefinition of types, so I have a single C file in my projects that handles all standard C activities and uses the DONT_REDEFINE inclusion. Note that you must have this line before #include fdetypes.h, as in:

#define DONT_REDEFINE
#include "fapi.h"
#include "fdetypes.h"

[Russ Ward]

There must be some keystroke that automatically clicks the Post button and that is quite annoying indeed. Anyway, I think that's about it.

Russ

[anupambakshi]

Thanks. That worked.

The magic of the #define DONT_REDEFINE made it work.