按照万版主的说法改进了一下程序，想学好工控真不容易啊，什么都得会，咨询了一下玩C语言的同事才搞定的。

#include "apdefap.h"

int gscAction( void )

{

#pragma code("useadmin.dll")

#include "PWRT_API.H"

#pragma code()

char* CUser = NULL;

CUser = GetTagChar("@CurrentUser");

if (strlen(CUser) != 0)

  {

strcat(CUser, "登录成功"); //Return-Type: char* 

   MessageBox(NULL,CUser,"恭喜!恭喜",

MB_OK|MB_ICONEXCLAMATION|MB_SETFOREGROUND|MB_SYSTEMMODAL);

  }

return 0;