"access denied" while getting temperature using WMI

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The following code is an attempt to use WMI to get the computer temperature.
It fails with an "access denied" exception upon the searcher.Get() procedure.
I have attempted to set the security for the WMI service using the Computer Management.
But this doesn't seem to affect the exception.
I have also set the Administrator privileges in the manifest -- no help.
The code fails on two different Windows 8.1 machines but is successful on a Windows 7 machine.
Any ideas?
--- Jim

C#

List<double> result = new List<double>();
ManagementObjectSearcher searcher = new ManagementObjectSearcher(@"root\WMI", "SELECT * FROM MSAcpi_ThermalZoneTemperature");
foreach (ManagementObject obj in searcher.Get())
{
     Double temp = Convert.ToDouble(obj["CurrentTemperature"].ToString());
     temp = (temp - 2732) / 10.0;
     result.Add(temp);
}

Posted 1-Sep-14 9:54am

Member 10020245

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Comments

Sergey Alexandrovich Kryukov 1-Sep-14 16:07pm

Windows 8 sucks? :-)
—SA

[no name] 1-Sep-14 16:19pm

Check to make sure that the motherboard actually has a temperature sensor.

Member 10020245 4-Sep-14 8:22am

wouldn't all mobos or CPU have a temp sensor??

My real problem is that the USB rate on the tabletPC seems to drop as a temp is reached. With Tablet outside in the sunlight, I can measure the temp with LED thermometer and see a temp at top-right of the Tablet at about 120 degF (Dell Venue Pro). At this temp, my USB connection to my digital camera fails. I want to monitor the CPU temp to determine when this occurrence is imminent. Maybe I need to revert to Windows 7 ..
Jim

[no name] 5-Sep-14 14:01pm

No not all do that's the point.

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Member 10020245 · Answer 1 · 2014-09-05T07:39:00

I seemingly resolved this using the information at:
http://bytes.com/topic/visual-basic-net/answers/382910-cpu-temperature[^]

this page described the use of a utility called "wbemtest.exe" that is a part of windows.
This utility lets you test the WMI capability of the local machine.

Just type it at the Command Prompt.
Do a "Connect" to get to the local machine.

Then click "query" and type in the WMI command you are attempting to use with WMI
e.g. : Select * from acpi_temperaturezone

In my case, the response showed this was not available.
There is also: select * from win32_temperatureprobe
This returns results --- but the "current reading" is shown as "null" in my case.
Again showing that the mobo in the laptop I am using.

--- Jim