FireDAC指定mssql驱动

bool __fastcall IsWow64()
{
//为True时，则是32位的程序运行在64位的系统上，为False时，则是32位程序运行在32位系统上或64位程序运行在64位系统上！
 typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS)(HANDLE,PBOOL);
 LPFN_ISWOW64PROCESS fnIsWow64Process;
 BOOL bIsWow64=FALSE;
 fnIsWow64Process=(LPFN_ISWOW64PROCESS)GetProcAddress(GetModuleHandle(L"kernel32"),"IsWow64Process");
 if(fnIsWow64Process!=NULL)
   {
 if(!fnIsWow64Process(GetCurrentProcess(),&bIsWow64))
   {
    bIsWow64=FALSE;
   }
   }
 if(bIsWow64==FALSE)
   return false;
 else
   return true;
}

//---------------------------------------------------------------------------
UnicodeString __fastcall GetSQLServerNativeClientDll()
{
 UnicodeString Key,Value,DllName=L"sqlsrv32.dll";
 TStringList *List=new TStringList();
 TRegistry *Registry = new TRegistry();
 Registry->Access=KEY_QUERY_VALUE|KEY_READ;
 Registry->RootKey=HKEY_LOCAL_MACHINE;
 if(IsWow64())
   Key="SOFTWARE\\Wow6432Node\\ODBC\\ODBCINST.INI";
 else
   Key="SOFTWARE\\ODBC\\ODBCINST.INI";
 if(Registry->KeyExists(Key))
   {
 //ShowMessage(Key);
 Registry->OpenKey(Key,false);
 Registry->GetKeyNames(List);
 for(int i=List->Count;i>0;i--)
   {
    Value=List->Strings[i-1];
    //ShowMessage(Value);                    //
    if(Value.Pos(L"SQL Server Native Client")>0||Value.Pos(L"SQL Native Client")>0)
   {
    Registry->OpenKey(Value,false);
    DllName=Registry->ReadString(L"Driver");
    break;
         }
      }
   }
 Registry->CloseKey();
 delete Registry;
 delete List;
 //ShowMessage(DllName);
 return DllName;
}