How to get the %AppData% folder in C?

Question

As above, how do I get the AppData folder in Windows using C?

I know that for C# you use Environment.SpecialFolder.ApplicationData

Answer 1

If I recall correctly it should just be

#include <stdlib.h>
getenv("APPDATA");

Edit: Just double-checked, works fine!

Answer 2

Use SHGetSpecialFolderPath with a CSIDL set to the desired folder (probably CSIDL_APPDATA or CSIDL_LOCAL_APPDATA).

You can also use the newer SHGetFolderPath() and SHGetKnownFolderPath() functions. There's also SHGetKnownFolderIDList() and if you like COM there's IKnownFolder::GetPath().

Answer 3

You might use these functions:

#include <stdlib.h>
char *getenv( 
   const char *varname 
);
wchar_t *_wgetenv( 
   const wchar_t *varname 
);

Like so:

#include <stdio.h>
char *appData = getenv("AppData");
printf("%s\n", appData);

Answer 4

Using the %APPDATA% environment variable will probably work most of the time. However, if you want to do this the official Windows way, you should use use the SHGetFolderPath function, passing the CSIDL value CSIDL_APPDATA or CSIDL_LOCAL_APPDATA, depending on your needs.

This is what the Environment.GetFolderPath() method is using in .NET.

EDIT: Joey correctly points out that this has been replaced by SHGetKnownFolderPath in Windows Vista. News to me :-).