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_getdcwd_dbg, _wgetdcwd_dbg

Debug versions of the _getdcwd, _wgetdcwd functions (only available during debug).

char *_getdcwd_dbg(
   int drive,
   char *buffer,
   int maxlen,
   int blockType,
   const char *filename,
   int linenumber 
);
wchar_t *_wgetdcwd_dbg(
   int drive,
   wchar_t *buffer,
   int maxlen,
   int blockType,
   const char *filename,
   int linenumber 
);
drive

Name of the disk drive.

buffer

Storage location for the path.

maxlen

Maximum length of the path in characters: char for _getdcwd_dbgand wchar_tfor _wgetdcwd_dbg.

blockType

Requested type of the memory block: _CLIENT_BLOCKor _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 _getdcwd_dbg and _wgetdcwd_dbg functions are identical to _getdcwd and _wgetdcwd 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 buffer 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 _getdcwd and _wgetdcwd are remapped to _getdcwd_dbg and _wgetdcwd_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.

Generic-Text Routine Mappings

Tchar.h routine

_UNICODE and _MBCS not defined

_MBCS defined

_UNICODE defined

_tgetdcwd_dbg

_getdcwd_dbg

_getdcwd_dbg

_wgetdcwd_dbg

Routine

Required header

_getdcwd_dbg

<crtdbg.h>

_wgetdcwd_dbg

<crtdbg.h>

For more compatibility information, see Compatibility in the Introduction.

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