log4cxx and std::string

In my application I use std::string, but log4cxx uses log4cxx::String 
(std::basic_string).

How can I convert std::string to std::basic_string?

I tried the following workarround - it compiles, but it seems to have no effect.
Sometimes it produces fancy filenames like ^Ea

#ifdef WIN32
typedef wchar_t* LOG4CXXString;
#else
typedef log4cxx::String LOG4CXXString;
#endif

std::string filename = "logfile.log";
log4cxx::FileAppenderPtr appender = new log4cxx::FileAppender(layout, 
(LOG4CXXString) filename.c_str()); // compiles, but does not work

log4cxx::FileAppenderPtr appender = new log4cxx::FileAppender(layout, 
_T("logfile.log")); // compiles and works

I'm using Microsoft Visual C++ 6

Any help is appreciated!

Stefan
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