Assembles filename by directory path and given strings. Filename is ssembled by the order of given string, date, time.
ex) C:\Test\Capture 2008-09-05 15-38-15-123.avi
LPCTSTR MakePathnameByDate(LPCTSTR szTargetDirectory, LPCTSTR szName, LPCTSTR szExt, LPTSTR szBuf, int nBufLen);
Assembled pathname as LPTSTR type string.