How can I link dll with a class?

Development Programming & Scripting
1

I have see this A new, community-hosted Unreal Engine Wiki - Announcements - Unreal Engine Forums
But it just use a simple function in dll,
How can i link a dll with a custom class?
for example,

in DLL decklinkDLL.cpp

decklinkDiv* go(void)
{
	decklinkDiv* a = new decklinkDiv();
	return a;
}

and decklinkDiv is my custom class.

in source.def

LIBRARY "decklinkDLL.dll" ;LIBRARY
DESCRIPTION “DEFDESCRIPTION” ;
EXPORTS  ;
go @1;
daochu @2;

then I copy decklinkDLL.dll to Plugins folder
in unreal c++ porject
I can not ues

typedef decklinkDiv(*_decklinkDiv)(void);

#include "decklindaochu.h"
#include "decklinkP.h"
    
    typedef decklinkDiv(*_decklinkDiv)(void);
    UdecklinkP::UdecklinkP(const FObjectInitializer& ObjectInitializer)
    	 : Super(ObjectInitializer)
     {
    	 // Do stuff
     }

     int UdecklinkP::starC( )
        {
        	FString filePath = FPaths::Combine(*FPaths::GamePluginsDir(), TEXT("decklinkDLL.dll")); // Concatenate the plugins folder and the DLL file.
        	if (FPaths::FileExists(filePath))
        	{
        		void *DLLHandle;
        		DLLHandle = FPlatformProcess::GetDllHandle(*filePath); // Retrieve the DLL.
        		if (DLLHandle != NULL)
        		{
        			_decklinkDiv d = NULL;
        			FString procName = "go"; // The exact name of the DLL function.
        			 d= (_decklinkDiv)FPlatformProcess::GetDllExport(DLLHandle, *procName); // Export the DLL function.
        			 if (d != NULL)
        			 {
        				 d->daochu();
        			 }
        			}
        		}
        	return 100;
        	}

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