---
title: "helpstringdll | Microsoft Docs"
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---
# helpstringdll
Specifies the name of the DLL to use to perform document string lookup (localization).  
  
## Syntax  
  
```  
  
      [ helpstringdll(  
   "string"  
) ]  
```  
  
#### Parameters  
 `string`  
 The DLL to use to perform document string lookup.  
  
## Remarks  
 The **helpstringdll** C++ attribute has the same functionality as the [helpstringdll](http://msdn.microsoft.com/library/windows/desktop/aa366860) MIDL attribute.  
  
## Example  
  
```  
// cpp_attr_ref_helpstringdll.cpp  
// compile with: /LD  
#include <unknwn.h>  
[module(name="MyLib", helpstringdll="xx.dll")];  
  
[object, uuid("00000000-0000-0000-0000-000000000001")]  
__interface IMyI   
{  
   HRESULT xxx();  
};  
```  
  
## Requirements  
  
### Attribute Context  
  
|||  
|-|-|  
|**Applies to**|**class**, `interface`, interface method|  
|**Repeatable**|No|  
|**Required attributes**|None|  
|**Invalid attributes**|None|  
  
 For more information, see [Attribute Contexts](../windows/attribute-contexts.md).  
  
## See Also  
 [IDL Attributes](../windows/idl-attributes.md)   
 [Interface Attributes](../windows/interface-attributes.md)   
 [Class Attributes](../windows/class-attributes.md)   
 [Method Attributes](../windows/method-attributes.md)