Creates a registry key or modifies an existing registry key.

  
      [ rdx(   
   key,   
   valuename=NULL,   
   regtype   
) ]  

key
The name of the key to be created or opened.

valuename(optional)
Specifies the value field to be set. If a value field with this name does not already exist in the key, it is added.

regtype
The type of registry key being added. Can be one of the following: text, dword, binary, or CString.

The rdx C++ attribute creates or modifies an existing registry key for a COM component. The attribute adds a BEGIN_RDX_MAP macro to the object that implements the target member. RegistryDataExchange, a function injected as a result of the BEGIN_RDX_MAP macro, can be used to transfer data between the registry and the data members

This attribute can be used in conjunction with the coclass, progid, or vi_progid attributes or other attributes that implies one of these.

For more information about the attribute contexts, see Attribute Contexts.

The following code adds a registry key called MyValue to the system describing the CMyClass COM component.

// cpp_attr_ref_rdx.cpp  
// compile with: /LD /link /OPT:NOREF  
#define _ATL_ATTRIBUTES  
#include "atlbase.h"  
  
[module (name="MyLib")];  
  
class CMyClass {  
public:  
   CMyClass() {  
      strcpy_s(m_sz, "SomeValue");  
   }  
  
   [ rdx(key = "HKCR\\MyApp.MyApp.1", valuename = "MyValue", regtype = "text")]   
   char m_sz[256];  
};  

COM Attributes
registration_script