PEPROCESS结构很奇怪吗?编译不过去?

VOID Test()
{
    PEPROCESS PS = PsGetCurrentProcess();
    PLARGE_INTEGER ProcessCreateTime=&PS->CreateTime;
    ...
}

编译错误
error C2037: left of 'CreateTime' specifies undefined struct/union '_KPROCESS'

用的PEPROCESS ，怎么是KPROCESS'，奇怪啊