在WINCC中用C语言写了一段代码以一分钟周期运行之后,点击开始中的关机...出现对话框后再点击关机　重启　注销都没有反应．关闭了这段代码的运行，问题依旧出现．


代码如下
#pragma code ("UseAdmin.DLL")
#include "pwrt_api.h"
#pragma code()
#pragma code ("ALMXGINA.DLL")
BOOL SetXGinaValue(unsigned int uiKey, BOOL *pbEnable, DWORD dwSize);
#pragma code()

BOOL bEnable;
BOOL bOK;
#define XGINA_ALLOW_SHUTDOWN 1
#define XGINA_ALLOW_LOGOUT 2
#define XGINA_ALLOW_CTL_ALT_DEL 3
#define XGINA_ALLOW_CTL_ESC 4
#define XGINA_ALLOW_ALT_ESC 5
#define XGINA_ALLOW_ALT_TAB 6

bEnable = PWRTCheckPermission(19, TRUE);
bOK = SetXGinaValue(XGINA_ALLOW_SHUTDOWN , &bEnable , sizeof(bEnable ));
bOK = SetXGinaValue(XGINA_ALLOW_LOGOUT , &bEnable , sizeof(bEnable ));
bOK = SetXGinaValue(XGINA_ALLOW_CTL_ALT_DEL , &bEnable , sizeof(bEnable ));
bOK = SetXGinaValue(XGINA_ALLOW_CTL_ESC , &bEnable , sizeof(bEnable ));
bOK = SetXGinaValue(XGINA_ALLOW_ALT_ESC , &bEnable , sizeof(bEnable ));
bOK = SetXGinaValue(XGINA_ALLOW_ALT_TAB , &bEnable , sizeof(bEnable ));
printf("#I101: SetXGinaValue() - bEnable=%d bOK=%d (lock/unlock windows keys)\r\n", bEnable, bOK);


请教高手是何原因引起,如何补救.