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_tempnam_dbg, _wtempnam_dbg

Function versions of _tempnam, _wtempnam, tmpnam, _wtmpnam that use the debug version of malloc, _malloc_dbg.

char *_tempnam_dbg(
   const char *dir,
   const char *prefix,
   int blockType,
   const char *filename,
   int linenumber 
wchar_t *_wtempnam_dbg(
   const wchar_t *dir,
   const wchar_t *prefix,
   int blockType,
   const char *filename,
   int linenumber 



The path used in the file name if there is no TMP environment variable, or if TMP is not a valid directory.


The string that will be pre-pended to names returned by _tempnam.


Requested type of memory block: _CLIENT_BLOCK or _NORMAL_BLOCK.


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


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

Each function returns a pointer to the name generated or NULL if there is a failure. Failure can occur if there is an invalid directory name specified in the TMP environment variable and in the dir parameter.


free (or free_dbg) does need to be called for pointers allocated by _tempnam_dbg and _wtempnam_dbg.

The _tempnam_dbg and _wtempnam_dbg functions are identical to _tempnam and _wtempnam 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 flag _CRTDBG_MAP_ALLOC. When _CRTDBG_MAP_ALLOC is defined, calls to _tempnam and _wtempnam are remapped to _tempnam_dbg and _wtempnam_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 & _MBCS not defined _MBCS defined _UNICODE defined





Routine Required header Compatibility

_tempnam_dbg, _wtempnam_dbg


Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003

For additional compatibility information, see Compatibility in the Introduction.

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.