unit UnitDll;

 interface

 uses

   StrUtils, SysUtils, Dialogs;

 function DoBusinessWide(pvData: PWideChar): PWideChar; stdcall;

 implementation

 function DoBusinessWide(pvData: PWideChar): PWideChar; stdcall;

 var

   lvData: WideString;

 begin

   ShowMessage(pvData);

   lvData := pvData;

   ShowMessage(lvData);

   lvData := lvData + FormatDateTime('YYYYMMDDHHMMSSZZZ',Now);

   Result := PWideChar(lvData);

   ShowMessage(Result);

 end;

 end.

 package com.jna.demo;

 import com.sun.jna.Library;

 import com.sun.jna.Native;

 import com.sun.jna.WString;

 public class JnaDemo {

     public interface RtcPubLibrary extends Library{

         RtcPubLibrary instance = (RtcPubLibrary) Native.loadLibrary("JavaDll", RtcPubLibrary.class);

         public WString DoBusinessWide(char[] pvData);

     }

     public static void main(String[] args) {

         System.setProperty("jna.encoding", "GBK");

         StringBuilder sBuilder = new StringBuilder();

         sBuilder.append("123测试");

         char[] pvData = sBuilder.toString().toCharArray();

         WString lvData = RtcPubLibrary.instance.DoBusinessWide(pvData);

         System.out.println("Wstring-->" + lvData);

     }

 }