OpenThreadToken()的困惑

[billtw]

下面这段代码为什么总是在执行OpenThreadToken后出错，GetLastError得到的错误码是988，内存分配访问无效???

....

BOOL bSucceed = TRUE;
HANDLE hCurThread;
PHANDLE pToken;

hCurThread = GetCurrentThread();
bSucceed = OpenThreadToken(hCurThread,TOKEN_ADJUST_PRIVILEGES,TRUE,pToken);
DWORD dw = GetLastError();

...