Versions of _fullpath, _wfullpath that use the debug version of malloc to allocate memory.
char *_fullpath_dbg( char *absPath, const char *relPath, size_t maxLength, int blockType, const char *filename, int linenumber ); wchar_t *_wfullpath_dbg( wchar_t *absPath, const wchar_t *relPath, size_t maxLength, int blockType, const char *filename, int linenumber );
Each function returns a pointer to a buffer containing the absolute path name (absPath). If there is an error (for example, if the value passed in relPath includes a drive letter that is not valid or cannot be found, or if the length of the created absolute path name (absPath) is greater than maxLength) the function returns NULL.
The _fullpath_dbg and _wfullpath_dbg functions are identical to _fullpath and _wfullpath except that, when _DEBUGis defined, these functions use the debug version of malloc, _malloc_dbg, to allocate memory if NULL is passed as the first parameter. For information on the debugging features of _malloc_dbg, see _malloc_dbg.
You do not need to call these functions explicitly in most cases. Instead, you can define the _CRTDBG_MAP_ALLOC flag. When _CRTDBG_MAP_ALLOCis defined, calls to _fullpath and _wfullpathare remapped to _fullpath_dbg and _wfullpath_dbg, respectively, with the blockType set to _NORMAL_BLOCK. Thus, you do not need to call these functions explicitly unless you want to mark the heap blocks as _CLIENT_BLOCK. For more information, see Types of Blocks on the Debug Heap.
_UNICODE and _MBCS not defined
For more compatibility information, see Compatibility in the Introduction.