excel - Accessing a nested structure in C++ from VBA -

I have a library written in C ++ and using Visual Studio 2010 Has been compiled as DLL. DLL has multiple export functions Export operations are accessible from Excel using declared function .

I am trying to implement a new feature in the program which requires the nested structures in the ++ portion which is then accessed from VBA. The C ++ code looks like this.

First Structure

  Structure parameter {double value; Four * label; Four * description; Four * units; };  

Second Structure

This structure is used as the following structure:

  Struct output {parameter field_1; Parameter field_2; Parameter field 4; };  

There are a few ways that I am thinking of reaching the structure from VBA. One of these is with the zero function, such as.

  zero function 1 (output * output_function 1);  

The second is an action that gives the output structure, such as

  Output function 2 ();  

Internal on the two tasks given above does not matter at this point. I have verified that both implementations work as intended in C ++ code.

Issue

I am unable to use either of these two structures using VBA either Function1 or Function2 .

I declared two custom types in VBA.

  Type parameter as parameter field 3 as parameter field 2 String termination type type output field 1 string values ​​as string units double as the label value Function1  for the parameter end type   
 I have declared the exported function as follows.  
  Sub Function 1 Lib "C: Path \ to \ library.dll" (Output as Bayreaf Output Start)  
 
 and  Function2 < For / code>, the following.  
  declare output  
 
  function 2  gives crash excel and  Function1  as sub Function2 Lib "C: \ Path \ to \ library.dll" error me  vba byref logic type mismatch . 
 
 What am I doing wrong here? What is the right approach?