Locate user's profile directory on windows

[ola-importer]

From si...@nomis52.net on May 22, 2011 09:30:50

On *nix we use getpwuid_r() to locate the user's home dir. Under Windows we can read the %UserProfile% environment variable.

We should add a function

string GetEnvVariable(const string &variable)

to the common utils and use this to read the env var.

Original issue: http://code.google.com/p/open-lighting/issues/detail?id=139

[ola-importer]

From sl1200mk2 on May 23, 2011 00:10:25

there are several way to retrieve environment variable on windows:
-GetEnvironmentStrings() wich can be used to get system and user variables
-ExpandEnvironmentStrings() with "%ProgramFiles%" as first argument to retrieve exe location path

it depends of wich varaiable we need.

++
nicolas

[ola-importer]

From si...@nomis52.net on May 23, 2011 08:10:14

We only need to fetch a single variable at a time so ExpandEnvironmentStrings() is the most appropriate here.

[ola-importer]

From sl1200mk2 on May 25, 2011 06:59:50

from all i saw, major issue with ExpandEnvironmentStrings() is this function needs WCHAR as parameter.
we can use MultiByteToWideChar() to convert const char* to LPCWSTR and WideCharToMultiByte() to reverse LPCWSTR to const char

[ola-importer]

From si...@nomis52.net on May 25, 2011 08:32:21

Ok, after reading http://www.codeproject.com/Tips/76252/What-are-TCHAR-WCHAR-LPSTR-LPWSTR-LPCTSTR-etc.aspx and coming up to speed on win32 string handling, it looks like it'll only require a LPCWSTR is unicode is on. Is unicode on when we compile? How can we check and/or turn it off?

I think this should work if unicode is off

const string key = "foo" // this would be the argument to the function we're writing
ExpandEnvironmentStrings(key.c_str(), buffer, buffer_length );

[ola-importer]

From sl1200mk2 on June 06, 2011 06:39:14

unicode is off unless you set to 1 _UNICODE and UNICODE macro

this is coming from curl and should work as we do not turn on unicode, variable should be "%ProgramFiles%"

char env[MAX_PATH]; /* MAX_PATH is from windef.h */
char *temp = getenv(variable);
env[0] = '\0';
if(temp != NULL)
ExpandEnvironmentStrings(temp, env, sizeof(env));
return (env[0] != '\0')?strdup(env):NULL;

but maybe this is too much c style...

[ola-importer]

From si...@nomis52.net on June 06, 2011 08:13:37

Let's start with that and then I can provide comments on C++ style.

[ola-importer]

From sl1200mk2 on June 06, 2011 08:28:27

maybe it will be an issue for the future if we don't use wchar_t on windows ?
we can write function to return std::string from TCHAR...

[ola-importer]

From si...@nomis52.net on June 06, 2011 08:33:40

We'll ignore unicode for now and just go with what you have above.

[ola-importer]

From sl1200mk2 on June 06, 2011 08:40:11

ok Simon

[lukase]

olad preferences are now stored in %LOCALAPPDATA%/.ola/. This is handled in OlaDaemon::DefaultConfigDir() by using SHGetFolderPath with CSIDL_LOCAL_APPDATA .