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title: "_bstr_t::Attach | Microsoft Docs"
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---
# _bstr_t::Attach
**Microsoft Specific**  
  
 Links a `_bstr_t` wrapper to a `BSTR`.  
  
## Syntax  
  
```  
  
      void Attach(  
   BSTR s  
);  
```  
  
#### Parameters  
 *s*  
 A `BSTR` to be associated with, or assigned to, the `_bstr_t` variable.  
  
## Remarks  
 If the `_bstr_t` was previously attached to another `BSTR`, the `_bstr_t` will clean up the `BSTR` resource, if no other `_bstr_t` variables are using the `BSTR`.  
  
## Example  
 See [_bstr_t::Assign](../cpp/bstr-t-assign.md) for an example using **Attach**.  
  
 **END Microsoft Specific**  
  
## See Also  
 [_bstr_t Class](../cpp/bstr-t-class.md)