Passing structure as dll function argument

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MFC

DLL

Hello All,

I have structure called POUDetails which has the following members.

{
typedef struct POUDetails
{
 CStringArray POUName;
 int Version;
 Cstring View;
.
.
}
.
.
.

POUDetails First;        ///instance of structure.

}

I want to pass this structure as function argument of dll function,
Dll function:

void WINAPI FillPOU(POUDetails mystruct,int index)
{
}

Dll function call

FillPOU(First,1)

This gives me error of
cannot convert POUDetails to POUDetails.

so next time I go with pointers like

void WINAPI FillPOU(POUDetails* mystruct,int index)
{
}

and function called

FillPOU(&First,1);

even then it gives me error of
Cannot convert POUDetails* _w64 to POUDetails*

Can anybody give me some clue about this.