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_getdcwd_dbg, _wgetdcwd_dbg

Visual Studio 2010

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 
);

Parameters

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.

Return Value

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.

Remarks

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.