CreateProcess中怎么使用系统环境变量和用户变量，不继承调用进程环境变量

[刘温鉴]

BOOl CreateProcess
(
LPCTSTR lpApplicationName,
LPTSTR lpCommandLine,
LPSECURITY_ATTRIBUTES lpProcessAttributes。
LPSECURITY_ATTRIBUTES lpThreadAttributes,
BOOL bInheritHandles,
DWORD dwCreationFlags,
LPVOID lpEnvironment,
LPCTSTR lpCurrentDirectory,
LPSTARTUPINFO lpStartupInfo,
LPPROCESS_INFORMATIONlpProcessInformation
);
倒数第四个变量lpEnvironment为null，即继承调用进程的环境变量，现在需求是使用当前系统环境变量和当前用户变量创建进程。则使用了CreateEnvironmentBlock（&lpEnvironment，null,false);其中第二个参数即为只创建系统环境变量，第三个参数为false即不继成调用进程的环境变量，但是我还需要当前用户的环境变量。HKEY_CURRENT_USER\Volatile Environment下的环境变量使用当前用户的怎么办

[fefe82]

https://msdn.microsoft.com/en-us/library/windows/desktop/bb762270%28v=vs.85%29.aspx

hToken [in, optional]

Type: HANDLE

Token for the user, returned from the LogonUser function. If this is a primary token, the token must have TOKEN_QUERY and TOKEN_DUPLICATE access. If the token is an impersonation token, it must have TOKEN_QUERY access. For more information, see Access Rights for Access-Token Objects.

If this parameter is NULL, the returned environment block contains system variables only.