调用WritePwrScheme不成功,为啥呢?

Question

我想要象XP的电源使用方案中加一个电源使用方案，经查找相关资料，
是调用powrprof.dll中的WritePwrScheme这个函数,如MSDN中http://msdn.microsoft.com/en-us/library/aa372711(v=VS.85).aspx调用代码:
C/C++ code
POWER_POLICY policy;
    policy.mach.DozeS4TimeoutAc = 30*60;
    policy.user.SpindownTimeoutAc = 30 * 60;
    policy.user.VideoTimeoutAc = 30*60;    
    LPCWSTR lpszSchemeName = L"Name";
    LPCWSTR lpszSchemeDescription = L"Description";    WritePwrScheme(id,lpszSchemeName,lpszSchemeDescription,&policy);但调用不成功，返回0
为啥呢?

Answer 1

http://topic.csdn.net/u/20100710/13/08b440aa-1220-4416-b8f4-afb50a81f87e.html