|Important||This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here. ArchiveDisclaimer|
Versions of _strdup and _wcsdup that use the debug version of malloc.
char *_strdup_dbg( const char *strSource, int blockType, const char *filename, int linenumber ); wchar_t *_wcsdup_dbg( const wchar_t *strSource, int blockType, const char *filename, int linenumber );
Null-terminated source string.
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.
The _strdup_dbg and _wcsdup_dbg functions are identical to _strdup and _wcsdup except that, when _DEBUG is defined, these functions use the debug version of malloc, _malloc_dbg, to allocate memory for the duplicated string. 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 flag _CRTDBG_MAP_ALLOC. When _CRTDBG_MAP_ALLOC is defined, calls to _strdup and _wcsdup are remapped to _strdup_dbg and _wcsdup_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 on block types, see Types of Blocks on the Debug Heap.
|TCHAR.H routine||_UNICODE & _MBCS not defined||_MBCS defined||_UNICODE defined|
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.
All debug versions of the C run-time libraries.