_getcwd_dbg, _wgetcwd_dbg

 

For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.

Debug versions of the _getcwd, _wgetcwd functions (only available during debug).

char *_getcwd_dbg(   
   char *buffer,  
   int maxlen,  
   int blockType,  
   const char *filename,  
   int linenumber   
);  
wchar_t *_wgetcwd_dbg(   
   wchar_t *buffer,  
   int maxlen,  
   int blockType,  
   const char *filename,  
   int linenumber   
);  

Parameters

buffer
Storage location for the path.

maxlen
Maximum length of the path in characters: char for _getcwd_dbg and wchar_t for _wgetcwd_dbg.

blockType
Requested type of the memory block: _CLIENT_BLOCK or _NORMAL_BLOCK.

filename
Pointer to the name of the source file that requested the allocation operation or NULL.

linenumber
Line number in the source file where the allocation operation was requested or NULL.

Returns a pointer to buffer. A NULL return value indicates an error, and errno is set either to ENOMEM, indicating that there is insufficient memory to allocate maxlen bytes (when a NULL argument is given as buffer), or to ERANGE, indicating that the path is longer than maxlen characters.

For more information, see errno, _doserrno, _sys_errlist, and _sys_nerr.

The _getcwd_dbg and _wgetcwd_dbg functions are identical to _getcwd and _wgetcwd except that, when _DEBUG is defined, these functions use the debug version of malloc and _malloc_dbg to allocate memory if NULL is passed as the first parameter. For more information, 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_ALLOC is defined, calls to _getcwdand _wgetcwdare remapped to _getcwd_dbgand _wgetcwd_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.

Tchar.h routine_UNICODE and _MBCS not defined_MBCS defined_UNICODE defined
_tgetcwd_dbg_getcwd_dbg_getcwd_dbg_wgetcwd_dbg
RoutineRequired header
_getcwd_dbg<crtdbg.h>
_wgetcwd_dbg<crtdbg.h>

For more compatibility information, see Compatibility in the Introduction.

CurrentDirectory

_getcwd, _wgetcwd
Directory Control
Debug Versions of Heap Allocation Functions

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