Error Calling DLL function

i want Call Dll in unity . But in unity call function SendData(1,2,3,4) not send 1,2,3,4 its send 86972112,2,1,1

What is my wrong Please Help me ? How can i fix this code ?

This is Lazarus function. I want call it from unity

      Function SendData(MG,SG,LG,V:integer):integer;export;
          var
            s:string;
         
         
          begin
         
           fga:=mg;
           sga:=sg;
           faa:=(8*fga)+sg;
           laa:=lg;
           sval:=v;
         
           s:='';
           s:= s+ 'MG :'+inttostr(Mg)+#13;
           s:= s+ 'SG :'+inttostr(sg)+#13;
           s:= s+ 'LG :'+inttostr(lg)+#13;
           s:= s+ 'V :'+inttostr(v)+#13;
         
             MessageBox(0,PChar(s),PChar('Lazarus'),mb_ok);
         
         end;

And This is C# in unity

 using UnityEngine;
 using System.Runtime.InteropServices;
 using System.Collections;
 using System;
 class CallLazarDLL : MonoBehaviour {
 
 
     
     [DllImport ("dllDeneme")]
     private static extern byte Connect ();
 
     [DllImport ("dllDeneme")]
     private static extern byte Disconnect();
     
     [DllImport ("dllDeneme")]
     private static extern int SendData  (int MG, int SG, int LG, int v);
     
     [DllImport ("dllDeneme")]
     private static extern byte GetData ();
     
 
     
     public Light switchLight;
        void Start(){
         print ("Connect :"+ Connect());
     }
     void OnApplicationQuit(){
     print ("Disconnect :" +    Disconnect());
     }
     
     void OnMouseDown () {

         switchLight.enabled = !switchLight.enabled;       

           if (switchLight == enabled){
              print ("Group" + SendData(1,2,3,4));
         }else{
             print ("Group" + SendData(1,2,3,4));
         }
    }
 
    void Update(){
      print ("READ :"+GetData());    
     }
     
     
     
 }