如何检测我的进程是否正在运行 UAC 提升?

问题描述

我的 Vista 应用程序需要知道用户是以管理员"身份(提升)还是作为标准用户(非提升)启动它.如何在运行时检测到它?

My Vista application needs to know whether the user has launched it "as administrator" (elevated) or as a standard user (non-elevated). How can I detect that at run time?

推荐答案

下面的 C++ 函数可以做到这一点:

The following C++ function can do that:

HRESULT GetElevationType( __out TOKEN_ELEVATION_TYPE * ptet );

/*
Parameters:

ptet
    [out] Pointer to a variable that receives the elevation type of the current process.

    The possible values are:

    TokenElevationTypeDefault - This value indicates that either UAC is disabled,
        or the process is started by a standard user (not a member of the Administrators group).

    The following two values can be returned only if both the UAC is enabled
    and the user is a member of the Administrator's group:

    TokenElevationTypeFull - the process is running elevated.

    TokenElevationTypeLimited - the process is not running elevated.

Return Values:

    If the function succeeds, the return value is S_OK.
    If the function fails, the return value is E_FAIL. To get extended error information, call GetLastError().

Implementation:
*/

HRESULT GetElevationType( __out TOKEN_ELEVATION_TYPE * ptet )
{
    if ( !IsVista() )
        return E_FAIL;

    HRESULT hResult = E_FAIL; // assume an error occurred
    HANDLE hToken   = NULL;

    if ( !::OpenProcessToken(
                ::GetCurrentProcess(),
                TOKEN_QUERY,
                &hToken ) )
    {
        return hResult;
    }

    DWORD dwReturnLength = 0;

    if ( ::GetTokenInformation(
                hToken,
                TokenElevationType,
                ptet,
                sizeof( *ptet ),
                &dwReturnLength ) )
    {
            ASSERT( dwReturnLength == sizeof( *ptet ) );
            hResult = S_OK;
    }

    ::CloseHandle( hToken );

    return hResult;
}

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